行业知识
深入浅出Android dmabuf
2026-11-04 17:26:09
来源：互联网转载
目录
dmabuf是什么？
dmabuf_dump工具介绍(基于Android 14)
Android.bp
dmabuf_dump.cpp
整体架构结构如下
dmabuf_dump主要包含以下功能
前置背景知识
fdinfo
思考
bufinfo
Dump整个手机系统的dmabuf
Dump某个进程的dmabuf
以Table[buffer x process]方式呈现dmabuf
Dump整个系统DMA-BUF per-buffer, per-exporter and per-device statistics
DMA_BUF 在内核中的实现
dmabuf_dump原理分析
源码路径：
DmaBuffer
主要成员变量
FD和Inode的关系
dump整个系统流程原理
ReadDmaBufFdRefs
AddFdRef
ReadDmaBufMapRefs
AddMapRef
dmabuf_dump
dmabuf_dump -a
dmabuf_dump -b
代码流程
dmabuf的运用
实例分析
背景
解决方案
加tracepoint
tracepoint实现patch
使用simpleperf抓取dmabuf申请点所有backtrace
举例
Provider进程基于vendor.qti.hardware.display.allocator-service申请驻留分析
dmabuf是什么？
可以参考我之前写的一篇文章，在这篇文章中有介绍dma_buf：BufferManager_驱动的buffermanager-CSDN博客
dmabuf_dump工具介绍(基于Android 14)
dmabuf_dump是一个可执行文件，接收参数调用libdmabufinfo.a的接口完成dump功能，源码在：system/memory/libmeminfo/libdmabufinfo/tools/
安卓源代码目录下主要有下面2个文件，一个 Android.bp ，一个是 dmabuf_dump.cpp
Android.bp
// Copyright (C) 2019 The Android Open Source Project//// Licensed under the Apache License, Version 2.0 (the "License");// you may not use this file except in compliance with the License.// You may obtain a copy of the License at//// http://www.apache.org/licenses/LICENSE-2.0//// Unless required by applicable law or agreed to in writing, software// distributed under the License is distributed on an "AS IS" BASIS,// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.// See the License for the specific language governing permissions and// limitations under the License.package { default_applicable_licenses: ["Android-Apache-2.0"],}cc_binary { name: "dmabuf_dump", cflags: [ "-Wall", "-Werror", ], srcs: ["dmabuf_dump.cpp"], shared_libs: [ "libbase", ], static_libs: [ "libdmabufinfo", ], vendor_available: true,} dmabuf_dump.cpp
xref: /mivendor_u_sm8650/system/memory/libmeminfo/libdmabufinfo/tools/dmabuf_dump.cpp (revision unknown)HomeHistoryAnnotateLine# Scopes# Navigate#Raw Download current directory/* * Copyright (C) 2019 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include using DmaBuffer = ::android::dmabufinfo::DmaBuffer;[[noreturn]] static void usage(int exit_status) { fprintf(stderr, "Usage: %s [-abh] [per-process/per-buffer stats] \n" "-a\t show all dma buffers (ion) in big table, [buffer x process] grid \n" "-b\t show DMA-BUF per-buffer, per-exporter and per-device statistics \n" "-h\t show this help\n" " \t If PID is supplied, the dmabuf information for that process is shown.\n" " \t Per-buffer DMA-BUF stats do not take an argument.\n", getprogname()); exit(exit_status);}static std::string GetProcessComm(const pid_t pid) { std::string pid_path = android::base::StringPrintf("/proc/%d/comm", pid); std::ifstream in{pid_path}; if (!in) return std::string("N/A"); std::string line; std::getline(in, line); if (!in) return std::string("N/A"); return line;}static void PrintDmaBufTable(const std::vector& bufs) { if (bufs.empty()) { printf("dmabuf info not found ¯\\_(ツ)_/¯\n"); return; } // Find all unique pids in the input vector, create a set std::set pid_set; for (auto& buf : bufs) { pid_set.insert(buf.pids().begin(), buf.pids().end()); } // Format the header string spaced and separated with '|' printf(" Dmabuf Inode | Size | Fd Ref Counts | Map Ref Counts |"); for (auto pid : pid_set) { printf("%16s:%-5d |", GetProcessComm(pid).c_str(), pid); } printf("\n"); // holds per-process dmabuf size in kB std::map per_pid_size = {}; uint64_t dmabuf_total_size = 0; // Iterate through all dmabufs and collect per-process sizes, refs for (auto& buf : bufs) { printf("%16ju |%13" PRIu64 " kB |%16zu |%16zu |", static_cast(buf.inode()), buf.size() / 1024, buf.fdrefs().size(), buf.maprefs().size()); // Iterate through each process to find out per-process references for each buffer, // gather total size used by each process etc. for (pid_t pid : pid_set) { int pid_fdrefs = 0, pid_maprefs = 0; if (buf.fdrefs().count(pid) == 1) { // Get the total number of ref counts the process is holding // on this buffer. We don't differentiate between mmap or fd. pid_fdrefs += buf.fdrefs().at(pid); } if (buf.maprefs().count(pid) == 1) { pid_maprefs += buf.maprefs().at(pid); } if (pid_fdrefs || pid_maprefs) { // Add up the per-pid total size. Note that if a buffer is mapped // in 2 different processes, the size will be shown as mapped or opened // in both processes. This is intended for visibility. // // If one wants to get the total *unique* dma buffers, they can simply // sum the size of all dma bufs shown by the tool per_pid_size[pid] += buf.size() / 1024; printf("%9d(%6d) refs |", pid_fdrefs, pid_maprefs); } else { printf("%22s |", "--"); } } dmabuf_total_size += buf.size() / 1024; printf("\n"); } printf("------------------------------------\n"); printf("%-16s %13" PRIu64 " kB |%16s |%16s |", "TOTALS", dmabuf_total_size, "n/a", "n/a"); for (auto pid : pid_set) { printf("%19" PRIu64 " kB |", per_pid_size[pid]); } printf("\n"); return;}static void PrintDmaBufPerProcess(const std::vector& bufs) { if (bufs.empty()) { printf("dmabuf info not found ¯\\_(ツ)_/¯\n"); return; } // Create a reverse map from pid to dmabufs std::unordered_map pid_to_inodes = {}; uint64_t userspace_size = 0; // Size of userspace dmabufs in the system for (auto& buf : bufs) { for (auto pid : buf.pids()) { pid_to_inodes[pid].insert(buf.inode()); } userspace_size += buf.size(); } // Create an inode to dmabuf map. We know inodes are unique.. std::unordered_map inode_to_dmabuf; for (auto buf : bufs) { inode_to_dmabuf[buf.inode()] = buf; } uint64_t total_rss = 0, total_pss = 0; for (auto& [pid, inodes] : pid_to_inodes) { uint64_t pss = 0; uint64_t rss = 0; printf("%16s:%-5d\n", GetProcessComm(pid).c_str(), pid); printf("%22s %16s %16s %16s %16s\n", "Name", "Rss", "Pss", "nr_procs", "Inode"); for (auto& inode : inodes) { DmaBuffer& buf = inode_to_dmabuf[inode]; printf("%22s %13" PRIu64 " kB %13" PRIu64 " kB %16zu %16" PRIuMAX "\n", buf.name().empty() ? "" : buf.name().c_str(), buf.size() / 1024, buf.Pss() / 1024, buf.pids().size(), static_cast(buf.inode())); rss += buf.size(); pss += buf.Pss(); } printf("%22s %13" PRIu64 " kB %13" PRIu64 " kB %16s\n", "PROCESS TOTAL", rss / 1024, pss / 1024, ""); printf("----------------------\n"); total_rss += rss; total_pss += pss; } uint64_t kernel_rss = 0; // Total size of dmabufs NOT mapped or opened by a process if (android::dmabufinfo::GetDmabufTotalExportedKb(&kernel_rss)) { kernel_rss *= 1024; // KiB -> bytes if (kernel_rss >= userspace_size) kernel_rss -= userspace_size; else printf("Warning: Total dmabufs 整体架构结构如下
dmabuf_dump主要包含以下功能
- Dump整个系统DMA-BUF per-buffer, per-exporter and per-device statistics(dmabuf_dump -b)，在kernel版本>= 5.10上生效。
- Dump整个系统的dmabuf info (dmabuf_dump)
- Dump某个PID的dmabuf info (dmabuf_dump )
- 以Table[buffer x process]方式呈现dmabuf info (dmabuf_dump -a)
前置背景知识
- Rss的含义：是当前段实际加载到物理内存中的大小。
- Pss 指的是：进程按比例分配当前段所占物理内存的大小。
- 下面dump整个手机系统在某一时刻的 dmabuf信息，可以看到有 binder进程的dmabuf信息、surfaceflinger进程的dmabuf信息、system_server进程的dmabuf信息等等。
- nr_procs是指有多少个进程在使用这块dmabuf。
- Name是指dmabuf的名字
- Inode是这块 dmabuf的唯一标识，注意Inode是全局唯一的。
- PROCESS TOTAL 是统计 Rss 或者 Pss的总和。
- dmabuf total 是整个系统dambuf的总和
- userspace_rss 是用户空间 rss的总和。
- userspace_pss 是用户空间 pss的总和。
- kernel_rss 目前初步认为是 内核空间rss的总和，但不特别准确，这个kernel_rss大有来头，后面有时间详细深度剖析。真实的项目过程中，会偶先 kernel_rss占用过大，或泄露的情况，这种问题还特别难分析和解决。
fdinfo
/proc//fdinfo/ 下面的所有fd，针对每个fd读取如下信息:
- count
- exp_name，有exp_name则表示是 dmabuf 的file。
- name
- size
- ino：inode
以下是camera provider的 fdinfo
wj@wj:~/Downloads$ adb shell ps -e | grep cameracameraserver 1601 1 14307344 680656 binder_ioctl_write_read 0 S vendor.qti.camera.provider-service_64cameraserver 2785 1 2720288 25620 binder_ioctl_write_read 0 S cameraserveru0_a139 11065 1444 9305388 343752 do_epoll_wait 0 S com.android.camerawj@wj:~/Downloads$ adb shellaurora:/ # cd /proc/1601/fdinfo/ aurora:/proc/1601/fdinfo # ls0 110 1137 117 123 15 19 22 26 3 33 36 383 399 406 43 47 50 54 56 6 63 67 7 73 745 751 79 82 8991 111 114 118 124 16 2 23 27 30 336 37 384 4 407 44 48 51 55 57 60 64 68 70 731 748 76 8 84 910 112 115 121 13 17 20 24 28 31 34 38 386 40 41 45 49 52 557 58 61 65 687 71 74 75 77 80 8511 113 116 122 14 18 21 25 29 32 35 382 39 400 42 46 5 53 558 59 62 66 69 72 743 750 78 81 86
可以看到 fdinfo 有以下这些：
aurora:/proc/1601/fdinfo # ls0 110 1137 117 123 15 19 22 26 3 33 36 383 399 406 43 47 50 54 56 6 63 67 7 73 745 751 79 82 8991 111 114 118 124 16 2 23 27 30 336 37 384 4 407 44 48 51 55 57 60 64 68 70 731 748 76 8 84 910 112 115 121 13 17 20 24 28 31 34 38 386 40 41 45 49 52 557 58 61 65 687 71 74 75 77 80 8511 113 116 122 14 18 21 25 29 32 35 382 39 400 42 46 5 53 558 59 62 66 69 72 743 750 78 81 86
思考
我们知道每一个进程都有一个 fd，用户空间不同进程的 fd，是可以共享内核空间的同一块 dmabuf的，那么怎么样找到进程 fd 和对应 dmabuf的对应关系呢？
那么这个时候 inode 就要出场了，因为 dmabuf的inode是唯一确定的，所以这个时候我们可以把同一时刻的，这个进程的 dmabuf_dump给 dump下来，如下所示。
wj@wj:~$ adb shell ps -e | grep cameracameraserver 1601 1 14307344 680656 binder_ioctl_write_read 0 S vendor.qti.camera.provider-service_64cameraserver 2785 1 2720288 25620 binder_ioctl_write_read 0 S cameraserveru0_a139 11065 1444 9305388 343752 do_epoll_wait 0 S com.android.camerawj@wj:~$ adb shell dmabuf_dump 1601 vendor.qti.came:1601 Name Rss Pss nr_procs Inode system 4 kB 4 kB 1 134 system 4 kB 4 kB 1 135 system 4 kB 4 kB 1 723 system 4 kB 4 kB 1 724 system 4 kB 4 kB 1 725 system 4320 kB 4320 kB 1 727 system 736 kB 736 kB 1 729 system 148 kB 148 kB 1 731 system 32768 kB 32768 kB 1 733 system 4 kB 4 kB 1 996 system 4 kB 4 kB 1 1010 system 4 kB 4 kB 1 1011 system 736 kB 736 kB 1 1017 system 148 kB 148 kB 1 1019 system 6848 kB 6848 kB 1 1342 system 1024 kB 1024 kB 1 1359 system 32768 kB 32768 kB 1 1363 system 4 kB 4 kB 1 1367 system 4 kB 4 kB 1 1371 system 4 kB 4 kB 1 1372 PROCESS TOTAL 79540 kB 79540 kB ----------------------dmabuf total: 298652 kB kernel_rss: 219112 kB userspace_rss: 79540 kB userspace_pss: 79540 kB
然后我们可以用 grep -nr 命令进行查看，如下所示：
aurora:/proc/1601/fdinfo # grep -nr 733 ./124:4:ino:733aurora:/proc/1601/fdinfo # grep -nr 1372 ./751:4:ino:1372
inode为733的dmabuf 所对应的进程为：124
inode为1372的dmabuf所对应的进程为：751
bufinfo
我们可以通过获取 bufferinfo 来获取 dmabuf的详细信息。
adb shell cat /sys/kernel/debug/dma_buf/bufinfo
wj@wj:~/Downloads$ adb shell cat /sys/kernel/debug/dma_buf/bufinfoDma-buf Objects:size flags mode count exp_nameino name00032768000000020008000700000002qcom,system00002275qcom,systemAttached Devices:Total 0 devices attached00770048000000020008000700000001qcom,system00002274qcom,systemAttached Devices:Total 0 devices attached00032768000000020008000700000002qcom,system00002273qcom,systemAttached Devices:Total 0 devices attached00770048000000020008000700000001qcom,system00002272qcom,systemAttached Devices:Total 0 devices attached00032768000000020008000700000002qcom,system00002271qcom,systemAttached Devices:Total 0 devices attached00770048000000020008000700000001qcom,system00002270qcom,systemAttached Devices:Total 0 devices attached00032768000000020008000700000004qcom,system00002269qcom,systemAttached Devices:Total 0 devices attached10522624000000020008000700000004qcom,system00002268qcom,systemAttached Devices:kgsl-3d0kgsl-3d0Total 2 devices attached00032768000000020008000700000002qcom,system00002267qcom,systemAttached Devices:Total 0 devices attached10522624000000020008000700000001qcom,system00002266qcom,systemAttached Devices:Total 0 devices attached00032768000000020008000700000002qcom,system00002265qcom,systemAttached Devices:Total 0 devices attached10522624000000020008000700000001qcom,system00002264qcom,systemAttached Devices:Total 0 devices attached00032768000000020008000700000002qcom,system00002263qcom,systemAttached Devices:Total 0 devices attached10522624000000020008000700000001qcom,system00002262qcom,systemAttached Devices:Total 0 devices attached00032768000000020008000700000004qcom,system00002261qcom,systemAttached Devices:Total 0 devices attached10522624000000020008000700000004qcom,system00002260qcom,systemAttached Devices:kgsl-3d0kgsl-3d0Total 2 devices attached00032768000000020008000700000004qcom,system00002249qcom,systemAttached Devices:Total 0 devices attached10522624000000020008000700000003qcom,system00002248qcom,systemAttached Devices:kgsl-3d0Total 1 devices attached00032768000000020008000700000004qcom,system00002188qcom,systemAttached Devices:Total 0 devices attached10444800000000020008000700000003qcom,system00002187qcom,systemAttached Devices:kgsl-3d0Total 1 devices attached00004096000000020008000700000003system00002039systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb5Total 1 devices attached00004096000000020008000700000003system00002034systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb5Total 1 devices attached00004096000000020008000700000003system00002033systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb5Total 1 devices attached33554432000000020008000700000003system00002029systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb5Total 1 devices attached00151552000000020008000700000003system00002025systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb5Total 1 devices attached00106496000000020008000700000002system00002018systemAttached Devices:Total 0 devices attached00753664000000020008000700000003system00002017systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb5Total 1 devices attached07012352000000020008000700000003system00002008systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb5Total 1 devices attached00004096000000020008000700000003system00002005systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb5Total 1 devices attached00004096000000020008000700000003system00002004systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb5Total 1 devices attached00004096000000020008000700000003system00001958systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb5Total 1 devices attached00032768000000020008000700000002qcom,system00001953qcom,systemAttached Devices:Total 0 devices attached10444800000000020008000700000001qcom,system00001952qcom,systemAttached Devices:Total 0 devices attached00032768000000020008000700000002qcom,system00001502qcom,systemAttached Devices:Total 0 devices attached10522624000000020008000700000002qcom,system00001501qcom,systemAttached Devices:kgsl-3d0Total 1 devices attached00073728000000020008000700000002qcom,system00001460qcom,systemAttached Devices:Total 0 devices attached02506752000000020008000700000002qcom,system00001459qcom,systemAttached Devices:kgsl-3d0Total 1 devices attached00004096000000020008000700000003system00001372systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb4Total 1 devices attached00004096000000020008000700000003system00001371systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb4Total 1 devices attached00004096000000020008000700000003system00001367systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb4Total 1 devices attached33554432000000020008000700000003system00001363systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb4Total 1 devices attached01048576000000020008000700000003system00001359systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb4Total 1 devices attached07012352000000020008000700000003system00001342systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb4Total 1 devices attached00151552000000020008000700000003system00001019systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb4Total 1 devices attached00753664000000020008000700000003system00001017systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb4Total 1 devices attached00004096000000020008000700000002system00001011systemAttached Devices:Total 0 devices attached00004096000000020008000700000003system00001010systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb4Total 1 devices attached00004096000000020008000700000003system00000996systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb4Total 1 devices attached33554432000000020008000700000003system00000733systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb3Total 1 devices attached00151552000000020008000700000003system00000731systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb3Total 1 devices attached00753664000000020008000700000003system00000729systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb3Total 1 devices attached04423680000000020008000700000003system00000727systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb3Total 1 devices attached00004096000000020008000700000002system00000725systemAttached Devices:Total 0 devices attached00004096000000020008000700000003system00000724systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb3Total 1 devices attached00004096000000020008000700000003system00000723systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb3Total 1 devices attached00032768000000020008000700000002qcom,system00000669qcom,systemAttached Devices:Total 0 devices attached10522624000000020008000700000002qcom,system00000668qcom,systemAttached Devices:kgsl-3d0Total 1 devices attached00032768000000020008000700000004qcom,system00000665qcom,systemAttached Devices:Total 0 devices attached10522624000000020008000700000005qcom,system00000664qcom,systemAttached Devices:soc:qcom,smmu_sde_unsec_cbkgsl-3d0Total 2 devices attached00032768000000020008000700000004qcom,system00000663qcom,systemAttached Devices:Total 0 devices attached10522624000000020008000700000004qcom,system00000662qcom,systemAttached Devices:soc:qcom,smmu_sde_unsec_cbkgsl-3d0Total 2 devices attached00032768000000020008000700000004qcom,system00000343qcom,systemAttached Devices:Total 0 devices attached00491520000000020008000700000004qcom,system00000342qcom,systemAttached Devices:kgsl-3d0kgsl-3d0Total 2 devices attached00032768000000020008000700000004qcom,system00000341qcom,systemAttached Devices:Total 0 devices attached00491520000000020008000700000004qcom,system00000340qcom,systemAttached Devices:kgsl-3d0kgsl-3d0Total 2 devices attached00032768000000020008000700000004qcom,system00000339qcom,systemAttached Devices:Total 0 devices attached00491520000000020008000700000004qcom,system00000338qcom,systemAttached Devices:kgsl-3d0kgsl-3d0Total 2 devices attached00032768000000020008000700000004qcom,system00000337qcom,systemAttached Devices:Total 0 devices attached00491520000000020008000700000004qcom,system00000336qcom,systemAttached Devices:kgsl-3d0kgsl-3d0Total 2 devices attached00032768000000020008000700000002qcom,system00000321qcom,systemAttached Devices:Total 0 devices attached00131072000000020008000700000003qcom,system00000320qcom,systemAttached Devices:kgsl-3d0Total 1 devices attached00032768000000020008000700000004qcom,system00000319qcom,systemAttached Devices:Total 0 devices attached00212992000000020008000700000004qcom,system00000318qcom,systemAttached Devices:kgsl-3d0kgsl-3d0Total 2 devices attached00032768000000020008000700000004qcom,system00000317qcom,systemAttached Devices:Total 0 devices attached00212992000000020008000700000004qcom,system00000316qcom,systemAttached Devices:kgsl-3d0kgsl-3d0Total 2 devices attached00032768000000020008000700000004qcom,system00000315qcom,systemAttached Devices:Total 0 devices attached00212992000000020008000700000004qcom,system00000314qcom,systemAttached Devices:kgsl-3d0kgsl-3d0Total 2 devices attached00032768000000020008000700000004qcom,system00000313qcom,systemAttached Devices:Total 0 devices attached00212992000000020008000700000004qcom,system00000312qcom,systemAttached Devices:kgsl-3d0kgsl-3d0Total 2 devices attached00032768000000020008000700000004qcom,system00000311qcom,systemAttached Devices:Total 0 devices attached00352256000000020008000700000004qcom,system00000310qcom,systemAttached Devices:kgsl-3d0kgsl-3d0Total 2 devices attached00032768000000020008000700000004qcom,system00000309qcom,systemAttached Devices:Total 0 devices attached00974848000000020008000700000004qcom,system00000308qcom,systemAttached Devices:kgsl-3d0kgsl-3d0Total 2 devices attached00032768000000020008000700000004qcom,system00000307qcom,systemAttached Devices:Total 0 devices attached00974848000000020008000700000004qcom,system00000306qcom,systemAttached Devices:kgsl-3d0kgsl-3d0Total 2 devices attached00032768000000020008000700000004qcom,system00000305qcom,systemAttached Devices:Total 0 devices attached00974848000000020008000700000004qcom,system00000304qcom,systemAttached Devices:kgsl-3d0kgsl-3d0Total 2 devices attached00032768000000020008000700000004qcom,system00000303qcom,systemAttached Devices:Total 0 devices attached00974848000000020008000700000004qcom,system00000302qcom,systemAttached Devices:kgsl-3d0kgsl-3d0Total 2 devices attached00032768000000020008000700000004qcom,system00000293qcom,systemAttached Devices:Total 0 devices attached00974848000000020008000700000004qcom,system00000292qcom,systemAttached Devices:kgsl-3d0kgsl-3d0Total 2 devices attached00032768000000020008000700000004qcom,system00000291qcom,systemAttached Devices:Total 0 devices attached00974848000000020008000700000004qcom,system00000290qcom,systemAttached Devices:kgsl-3d0kgsl-3d0Total 2 devices attached00032768000000020008000700000004qcom,system00000289qcom,systemAttached Devices:Total 0 devices attached00974848000000020008000700000004qcom,system00000288qcom,systemAttached Devices:kgsl-3d0kgsl-3d0Total 2 devices attached00032768000000020008000700000004qcom,system00000286qcom,systemAttached Devices:Total 0 devices attached00974848000000020008000700000004qcom,system00000285qcom,systemAttached Devices:kgsl-3d0kgsl-3d0Total 2 devices attached00032768000000020008000700000004qcom,system00000258qcom,systemAttached Devices:Total 0 devices attached00352256000000020008000700000004qcom,system00000257qcom,systemAttached Devices:kgsl-3d0kgsl-3d0Total 2 devices attached00032768000000020008000700000004qcom,system00000220qcom,systemAttached Devices:Total 0 devices attached00393216000000020008000700000004qcom,system00000219qcom,systemAttached Devices:kgsl-3d0kgsl-3d0Total 2 devices attached00032768000000020008000700000004qcom,system00000218qcom,systemAttached Devices:Total 0 devices attached00393216000000020008000700000004qcom,system00000217qcom,systemAttached Devices:kgsl-3d0kgsl-3d0Total 2 devices attached00032768000000020008000700000004qcom,system00000216qcom,systemAttached Devices:Total 0 devices attached00393216000000020008000700000004qcom,system00000215qcom,systemAttached Devices:kgsl-3d0kgsl-3d0Total 2 devices attached00032768000000020008000700000004qcom,system00000214qcom,systemAttached Devices:Total 0 devices attached00393216000000020008000700000004qcom,system00000213qcom,systemAttached Devices:kgsl-3d0kgsl-3d0Total 2 devices attached00020480000000020008000700000003qcom,system00000172qcom,systemAttached Devices:soc:qcom,smmu_sde_unsec_cbTotal 1 devices attached00020480000000020008000700000003qcom,system00000171qcom,systemAttached Devices:soc:qcom,smmu_sde_unsec_cbTotal 1 devices attached00020480000000020008000700000003qcom,system00000170qcom,systemAttached Devices:soc:qcom,smmu_sde_unsec_cbTotal 1 devices attached00032768000000020008000700000002qcom,system00000167qcom,systemAttached Devices:Total 0 devices attached14745600000000020008000700000003qcom,system00000166qcom,systemAttached Devices:soc:qcom,smmu_sde_unsec_cbTotal 1 devices attached02097152000000020008000700000002qcom,qseecom00000165qcom,qseecomAttached Devices:Total 0 devices attached00004096000000020008000700000002qcom,qseecom00000164qcom,qseecomAttached Devices:Total 0 devices attached00012288000000020008000700000002qcom,qseecom00000162qcom,qseecomAttached Devices:Total 0 devices attached00262144000000020008000700000003system00000160systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb1Total 1 devices attached00004096000000020008000700000003system00000158systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb1Total 1 devices attached00262144000000020008000700000003system00000157systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb10Total 1 devices attached00004096000000020008000700000002system00000156systemAttached Devices:Total 0 devices attached00004096000000020008000700000003system00000155systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb10Total 1 devices attached00032768000000020008000700000003system00000154Attached Devices:soc:spf_core_platform:qcom,msm-audio-ionTotal 1 devices attached00032768000000020008000700000004qcom,system00000153qcom,systemAttached Devices:Total 0 devices attached10522624000000020008000700000005qcom,system00000152qcom,systemAttached Devices:soc:qcom,smmu_sde_unsec_cbkgsl-3d0Total 2 devices attached00004096000000020008000700000002system00000135systemAttached Devices:Total 0 devices attached00004096000000020008000700000003system00000134systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb11Total 1 devices attached00004096000000020008000700000002system00000079systemAttached Devices:Total 0 devices attached00004096000000020008000700000003system00000078systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb12Total 1 devices attached00032768000000020008000700000002qcom,system00000074qcom,systemAttached Devices:Total 0 devices attached00065536000000020008000700000002qcom,system00000073qcom,systemAttached Devices:kgsl-3d0Total 1 devices attached00004096000000020008000700000002system00000072systemAttached Devices:Total 0 devices attached00004096000000020008000700000003system00000071systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb11Total 1 devices attached00004096000000020008000700000002qcom,qseecom00000057qcom,qseecomAttached Devices:Total 0 devices attached00004096000000020008000700000002system00000048systemAttached Devices:Total 0 devices attached00004096000000020008000700000003system00000047systemAttached Devices:soc:qcom,msm_fastrpc:qcom,msm_fastrpc_compute_cb2Total 1 devices attached00008192000000020008000700000002qcom,qseecom00000046qcom,qseecomAttached Devices:Total 0 devices attached00008192000000020008000700000002qcom,qseecom00000045qcom,qseecomAttached Devices:Total 0 devices attached01200128000000020008000700000001qcom,system00000043Attached Devices:soc:qcom,cam_smmu:msm_cam_smmu_icpTotal 1 devices attached00024576000000020008000700000002qcom,qseecom00000036qcom,qseecomAttached Devices:Total 0 devices attached01048576000000000008000500000001qcom,system00000018Attached Devices:ab00000.qcom,cvp:cvp_non_secure_cbTotal 1 devices attached03141632000000000008000500000001qcom,system00000017Attached Devices:ab00000.qcom,cvp:cvp_non_secure_cbTotal 1 devices attached00004096000000020008000700000002qcom,qseecom00000016qcom,qseecomAttached Devices:Total 0 devices attached00028672000000020008000700000003qcom,qseecom00000013qcom,qseecomAttached Devices:firmware:qcom_smcinvokeTotal 1 devices attached00004096000000020008000700000003qcom,qseecom00000012qcom,qseecomAttached Devices:firmware:qcom_smcinvokeTotal 1 devices attached00028672000000020008000700000003qcom,qseecom00000011qcom,qseecomAttached Devices:firmware:qcom_smcinvokeTotal 1 devices attached00020480000000020008000700000003qcom,qseecom00000010qcom,qseecomAttached Devices:firmware:qcom_smcinvokeTotal 1 devices attached00516096000000020008000700000003qcom,qseecom00000009qcom,qseecomAttached Devices:firmware:qcom_smcinvokeTotal 1 devices attached00020480000000020008000700000003qcom,qseecom00000008qcom,qseecomAttached Devices:firmware:qcom_smcinvokeTotal 1 devices attached00020480000000020008000700000003qcom,qseecom00000007qcom,qseecomAttached Devices:firmware:qcom_smcinvokeTotal 1 devices attached00020480000000020008000700000003qcom,qseecom00000006qcom,qseecomAttached Devices:firmware:qcom_smcinvokeTotal 1 devices attached00020480000000020008000700000003qcom,qseecom00000005qcom,qseecomAttached Devices:firmware:qcom_smcinvokeTotal 1 devices attached00028672000000020008000700000003qcom,qseecom00000004qcom,qseecomAttached Devices:firmware:qcom_smcinvokeTotal 1 devices attached00004096000000000008000500000001qcom,system00000003Attached Devices:aa00000.qcom,vidc:non_secure_cbTotal 1 devices attached00004096000000000008000500000001qcom,system00000002Attached Devices:aa00000.qcom,vidc:non_secure_cbTotal 1 devices attached03133440000000000008000500000001qcom,system00000001Attached Devices:aa00000.qcom,vidc:non_secure_cbTotal 1 devices attachedTotal 154 objects, 305819648 bytes
可以看到有更多的dmabuf信息输出：size 、 flags、Attached Devices、mode 、count 、exp_name 、ino 、name
Dump整个手机系统的dmabuf
wj@wj:~/Downloads$ adb shellaurora:/ # dmabuf_dump binder:3072_2:3072 Name Rss Pss nr_procs Inode qcom,qseecom 12 kB 12 kB 1 160 PROCESS TOTAL 12 kB 12 kB ---------------------- mfp-daemon:3041 Name Rss Pss nr_procs Inode qcom,qseecom 4 kB 4 kB 1 163 qcom,qseecom 2048 kB 2048 kB 1 164 PROCESS TOTAL 2052 kB 2052 kB ---------------------- cdsprpcd:2824 Name Rss Pss nr_procs Inode system 4 kB 4 kB 1 139 system 256 kB 256 kB 1 141 system 104 kB 104 kB 1 1994 PROCESS TOTAL 364 kB 364 kB ---------------------- binder:1817_2:1817 Name Rss Pss nr_procs Inode qcom,qseecom 8 kB 8 kB 1 37 PROCESS TOTAL 8 kB 8 kB ---------------------- .android.camera:8920 Name Rss Pss nr_procs Inode system 4 kB 4 kB 1 1979 system 4 kB 4 kB 1 1987 system 4 kB 4 kB 1 1988 system 6848 kB 6848 kB 1 1990 system 736 kB 736 kB 1 1993 system 148 kB 148 kB 1 1996 system 32768 kB 32768 kB 1 1997 system 4 kB 4 kB 1 2000 system 4 kB 4 kB 1 2001 system 4 kB 4 kB 1 2002 qcom,system 2392 kB 2392 kB 1 2415 qcom,system 72 kB 72 kB 1 2416 qcom,system 2448 kB 2448 kB 1 2636 qcom,system 72 kB 72 kB 1 2637 PROCESS TOTAL 45508 kB 45508 kB ---------------------- iui.miwallpaper:4872 Name Rss Pss nr_procs Inode qcom,system 10276 kB 5138 kB 2 3711 qcom,system 32 kB 16 kB 2 3712 qcom,system 10276 kB 5138 kB 2 3723 qcom,system 32 kB 16 kB 2 3724 PROCESS TOTAL 20616 kB 10308 kB ---------------------- fidoca:1813 Name Rss Pss nr_procs Inode qcom,qseecom 24 kB 24 kB 1 25 PROCESS TOTAL 24 kB 24 kB ---------------------- binder:1808_2:1808 Name Rss Pss nr_procs Inode system 4 kB 4 kB 1 43 system 4 kB 4 kB 1 44 PROCESS TOTAL 8 kB 8 kB ---------------------- binder:3079_2:3079 Name Rss Pss nr_procs Inode qcom,system 14400 kB 14400 kB 1 165 qcom,system 32 kB 32 kB 1 166 PROCESS TOTAL 14432 kB 14432 kB ---------------------- android.hardwar:1607 Name Rss Pss nr_procs Inode qcom,qseecom 4 kB 4 kB 1 22 PROCESS TOTAL 4 kB 4 kB ---------------------- surfaceflinger:1929 Name Rss Pss nr_procs Inode qcom,system 64 kB 64 kB 1 71 qcom,system 32 kB 32 kB 1 72 qcom,system 10276 kB 5138 kB 2 133 qcom,system 32 kB 16 kB 2 134 qcom,system 384 kB 192 kB 2 225 qcom,system 32 kB 16 kB 2 226 qcom,system 384 kB 192 kB 2 227 qcom,system 32 kB 16 kB 2 228 qcom,system 384 kB 192 kB 2 229 qcom,system 32 kB 16 kB 2 230 qcom,system 384 kB 192 kB 2 231 qcom,system 32 kB 16 kB 2 232 qcom,system 344 kB 172 kB 2 247 qcom,system 32 kB 16 kB 2 248 qcom,system 952 kB 476 kB 2 292 qcom,system 32 kB 16 kB 2 293 qcom,system 952 kB 476 kB 2 298 qcom,system 32 kB 16 kB 2 299 qcom,system 952 kB 476 kB 2 302 qcom,system 32 kB 16 kB 2 303 qcom,system 952 kB 476 kB 2 304 qcom,system 32 kB 16 kB 2 305 qcom,system 952 kB 476 kB 2 308 qcom,system 32 kB 16 kB 2 309 qcom,system 952 kB 476 kB 2 310 qcom,system 32 kB 16 kB 2 311 qcom,system 952 kB 476 kB 2 312 qcom,system 32 kB 16 kB 2 313 qcom,system 952 kB 476 kB 2 314 qcom,system 32 kB 16 kB 2 315 qcom,system 344 kB 172 kB 2 323 qcom,system 32 kB 16 kB 2 324 qcom,system 208 kB 104 kB 2 325 qcom,system 32 kB 16 kB 2 326 qcom,system 208 kB 104 kB 2 327 qcom,system 32 kB 16 kB 2 328 qcom,system 208 kB 104 kB 2 329 qcom,system 32 kB 16 kB 2 330 qcom,system 208 kB 104 kB 2 331 qcom,system 32 kB 16 kB 2 332 qcom,system 128 kB 128 kB 1 333 qcom,system 32 kB 32 kB 1 334 qcom,system 480 kB 240 kB 2 349 qcom,system 32 kB 16 kB 2 350 qcom,system 480 kB 240 kB 2 351 qcom,system 32 kB 16 kB 2 352 qcom,system 480 kB 240 kB 2 353 qcom,system 32 kB 16 kB 2 354 qcom,system 480 kB 240 kB 2 355 qcom,system 32 kB 16 kB 2 356 qcom,system 10276 kB 5138 kB 2 645 qcom,system 32 kB 16 kB 2 646 qcom,system 10276 kB 5138 kB 2 647 qcom,system 32 kB 16 kB 2 648 qcom,system 10276 kB 10276 kB 1 829 qcom,system 32 kB 32 kB 1 830 qcom,system 10276 kB 10276 kB 1 2694 qcom,system 32 kB 32 kB 1 2695 qcom,system 10276 kB 5138 kB 2 3711 qcom,system 32 kB 16 kB 2 3712 qcom,system 10276 kB 5138 kB 2 3723 qcom,system 32 kB 16 kB 2 3724 qcom,system 10276 kB 5138 kB 2 3731 qcom,system 32 kB 16 kB 2 3732 PROCESS TOTAL 96016 kB 58444 kB ---------------------- mrmd:1809 Name Rss Pss nr_procs Inode qcom,qseecom 8 kB 8 kB 1 27 PROCESS TOTAL 8 kB 8 kB ---------------------- binder:1671_2:1671 Name Rss Pss nr_procs Inode qcom,system 10276 kB 5138 kB 2 133 qcom,system 32 kB 16 kB 2 134 qcom,system 20 kB 20 kB 1 169 qcom,system 20 kB 20 kB 1 170 qcom,system 20 kB 20 kB 1 171 qcom,system 10276 kB 5138 kB 2 645 qcom,system 32 kB 16 kB 2 646 qcom,system 10276 kB 5138 kB 2 647 qcom,system 32 kB 16 kB 2 648 PROCESS TOTAL 30984 kB 15522 kB ---------------------- vendor.qti.came:1650 Name Rss Pss nr_procs Inode system 4 kB 4 kB 1 142 system 4 kB 4 kB 1 143 system 4 kB 4 kB 1 1180 system 4 kB 4 kB 1 1194 system 4 kB 4 kB 1 1195 system 736 kB 736 kB 1 1201 system 148 kB 148 kB 1 1203 system 6848 kB 6848 kB 1 1601 system 1024 kB 1024 kB 1 1620 system 32768 kB 32768 kB 1 1621 system 4 kB 4 kB 1 1625 system 4 kB 4 kB 1 1627 system 4 kB 4 kB 1 1628 PROCESS TOTAL 41556 kB 41556 kB ---------------------- adsprpcd:2822 Name Rss Pss nr_procs Inode system 4 kB 4 kB 1 136 system 4 kB 4 kB 1 137 system 256 kB 256 kB 1 138 PROCESS TOTAL 264 kB 264 kB ---------------------- system_server:2293 Name Rss Pss nr_procs Inode qcom,system 10200 kB 5100 kB 2 3693 qcom,system 32 kB 16 kB 2 3694 PROCESS TOTAL 10232 kB 5116 kB ---------------------- ndroid.systemui:5329 Name Rss Pss nr_procs Inode qcom,system 952 kB 476 kB 2 292 qcom,system 32 kB 16 kB 2 293 qcom,system 952 kB 476 kB 2 298 qcom,system 32 kB 16 kB 2 299 qcom,system 952 kB 476 kB 2 302 qcom,system 32 kB 16 kB 2 303 qcom,system 952 kB 476 kB 2 304 qcom,system 32 kB 16 kB 2 305 qcom,system 952 kB 476 kB 2 308 qcom,system 32 kB 16 kB 2 309 qcom,system 952 kB 476 kB 2 310 qcom,system 32 kB 16 kB 2 311 qcom,system 952 kB 476 kB 2 312 qcom,system 32 kB 16 kB 2 313 qcom,system 952 kB 476 kB 2 314 qcom,system 32 kB 16 kB 2 315 qcom,system 208 kB 104 kB 2 325 qcom,system 32 kB 16 kB 2 326 qcom,system 208 kB 104 kB 2 327 qcom,system 32 kB 16 kB 2 328 qcom,system 208 kB 104 kB 2 329 qcom,system 32 kB 16 kB 2 330 qcom,system 208 kB 104 kB 2 331 qcom,system 32 kB 16 kB 2 332 qcom,system 480 kB 240 kB 2 349 qcom,system 32 kB 16 kB 2 350 qcom,system 480 kB 240 kB 2 351 qcom,system 32 kB 16 kB 2 352 qcom,system 480 kB 240 kB 2 353 qcom,system 32 kB 16 kB 2 354 qcom,system 480 kB 240 kB 2 355 qcom,system 32 kB 16 kB 2 356 qcom,system 752 kB 752 kB 1 463 qcom,system 32 kB 32 kB 1 464 qcom,system 752 kB 752 kB 1 465 qcom,system 32 kB 32 kB 1 466 qcom,system 752 kB 752 kB 1 467 qcom,system 32 kB 32 kB 1 468 qcom,system 10276 kB 10276 kB 1 3725 qcom,system 32 kB 32 kB 1 3726 qcom,system 10276 kB 10276 kB 1 3727 qcom,system 32 kB 32 kB 1 3728 qcom,system 10276 kB 10276 kB 1 3729 qcom,system 32 kB 32 kB 1 3730 qcom,system 10276 kB 5138 kB 2 3731 qcom,system 32 kB 16 kB 2 3732 qcom,system 752 kB 752 kB 1 3733 qcom,system 32 kB 32 kB 1 3734 qcom,system 752 kB 752 kB 1 3735 qcom,system 32 kB 32 kB 1 3736 qcom,system 752 kB 752 kB 1 3737 qcom,system 32 kB 32 kB 1 3738 PROCESS TOTAL 56816 kB 46222 kB ---------------------- sscrpcd:1281 Name Rss Pss nr_procs Inode system 4 kB 4 kB 1 76 system 4 kB 4 kB 1 77 PROCESS TOTAL 8 kB 8 kB ---------------------- binder:1589_2:1589 Name Rss Pss nr_procs Inode 32 kB 32 kB 1 135 PROCESS TOTAL 32 kB 32 kB ---------------------- com.miui.home:5380 Name Rss Pss nr_procs Inode qcom,system 384 kB 192 kB 2 225 qcom,system 32 kB 16 kB 2 226 qcom,system 384 kB 192 kB 2 227 qcom,system 32 kB 16 kB 2 228 qcom,system 384 kB 192 kB 2 229 qcom,system 32 kB 16 kB 2 230 qcom,system 384 kB 192 kB 2 231 qcom,system 32 kB 16 kB 2 232 qcom,system 344 kB 172 kB 2 247 qcom,system 32 kB 16 kB 2 248 qcom,system 344 kB 172 kB 2 323 qcom,system 32 kB 16 kB 2 324 qcom,system 10200 kB 10200 kB 1 3665 qcom,system 32 kB 32 kB 1 3666 qcom,system 10200 kB 5100 kB 2 3693 qcom,system 32 kB 16 kB 2 3694 PROCESS TOTAL 22880 kB 16556 kB ---------------------- qseecomd:1079 Name Rss Pss nr_procs Inode qcom,qseecom 28 kB 28 kB 1 1 qcom,qseecom 20 kB 20 kB 1 2 qcom,qseecom 20 kB 20 kB 1 3 qcom,qseecom 20 kB 20 kB 1 4 qcom,qseecom 20 kB 20 kB 1 5 qcom,qseecom 504 kB 504 kB 1 6 qcom,qseecom 20 kB 20 kB 1 7 qcom,qseecom 28 kB 28 kB 1 8 qcom,qseecom 4 kB 4 kB 1 9 qcom,qseecom 28 kB 28 kB 1 10 PROCESS TOTAL 692 kB 692 kB ---------------------- tee-supplicant:1525 Name Rss Pss nr_procs Inode qcom,qseecom 4 kB 4 kB 1 16 PROCESS TOTAL 4 kB 4 kB ---------------------- audioadsprpcd:490 Name Rss Pss nr_procs Inode system 4 kB 4 kB 1 79 system 4 kB 4 kB 1 80 PROCESS TOTAL 8 kB 8 kB ----------------------dmabuf total: 265484 kB kernel_rss: 8332 kB userspace_rss: 342528 kB userspace_pss: 257152 kB
Dump某个进程的dmabuf
下面Dump Camera Provider进程的dmabuf使用情况。
wj@wj:~/Downloads$ adb shell ps -e | grep cameracameraserver 1650 1 14121844 661800 binder_ioctl_write_read 0 S vendor.qti.camera.provider-service_64cameraserver 2691 1 3069520 23404 binder_ioctl_write_read 0 S cameraserveru0_a139 8920 1478 9591760 333440 do_epoll_wait 0 S com.android.camerawj@wj:~/Downloads$ adb shell dmabuf_dump 1650 vendor.qti.came:1650 Name Rss Pss nr_procs Inode system 4 kB 4 kB 1 142 system 4 kB 4 kB 1 143 system 4 kB 4 kB 1 1180 system 4 kB 4 kB 1 1194 system 4 kB 4 kB 1 1195 system 736 kB 736 kB 1 1201 system 148 kB 148 kB 1 1203 system 6848 kB 6848 kB 1 1601 system 1024 kB 1024 kB 1 1620 system 32768 kB 32768 kB 1 1621 system 4 kB 4 kB 1 1625 system 4 kB 4 kB 1 1627 system 4 kB 4 kB 1 1628 PROCESS TOTAL 41556 kB 41556 kB ----------------------dmabuf total: 265484 kB kernel_rss: 223928 kB userspace_rss: 41556 kB userspace_pss: 41556 kB
以Table[buffer x process]方式呈现dmabuf
注意，该方式只能看整个系统的dambuf
wj@wj:~/Downloads$ adb shellaurora:/ # dmabuf_dump -a Dmabuf Inode | Size | Fd Ref Counts | Map Ref Counts | audioadsprpcd:499 | qseecomd:1012 | sscrpcd:1254 | tee-supplicant:1491 | binder:1548_2:1548 | android.hardwar:1568 | vendor.qti.came:1601 | binder:1611_2:1611 | binder:1734_2:1734 | mrmd:1735 | fidoca:1743 | binder:1750_2:1750 | surfaceflinger:1846 | adsprpcd:2891 | cdsprpcd:2895 | mfp-daemon:3096 | binder:3104_2:3104 | binder:3118_2:3118 | iui.miwallpaper:4832 | ndroid.systemui:5265 | com.miui.home:5302 | 78 | 4 kB | 1 | 1 | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 79 | 4 kB | 1 | 1 | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 4 | 28 kB | 1 | 0 | -- | 2( 0) refs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 5 | 20 kB | 1 | 0 | -- | 2( 0) refs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 6 | 20 kB | 1 | 0 | -- | 2( 0) refs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 7 | 20 kB | 1 | 0 | -- | 2( 0) refs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 8 | 20 kB | 1 | 0 | -- | 2( 0) refs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 9 | 504 kB | 1 | 0 | -- | 2( 0) refs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 10 | 20 kB | 1 | 0 | -- | 2( 0) refs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 11 | 28 kB | 1 | 0 | -- | 2( 0) refs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 12 | 4 kB | 1 | 0 | -- | 2( 0) refs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 13 | 28 kB | 1 | 0 | -- | 2( 0) refs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 71 | 4 kB | 1 | 1 | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 72 | 4 kB | 1 | 1 | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 16 | 4 kB | 1 | 1 | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 154 | 32 kB | 1 | 1 | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 57 | 4 kB | 1 | 1 | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 134 | 4 kB | 1 | 1 | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 135 | 4 kB | 1 | 1 | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 170 | 20 kB | 1 | 1 | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 171 | 20 kB | 1 | 1 | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 172 | 20 kB | 1 | 1 | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 152 | 10276 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | 2( 0) refs | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | -- | -- | 153 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | -- | 47 | 4 kB | 1 | 1 | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 48 | 4 kB | 1 | 1 | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 46 | 8 kB | 1 | 1 | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 36 | 24 kB | 1 | 1 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 45 | 8 kB | 1 | 1 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | -- | -- | 62 | 18500 kB | 1 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | -- | -- | 63 | 32 kB | 1 | 1 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | -- | 64 | 18500 kB | 1 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | -- | -- | 65 | 32 kB | 1 | 1 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | -- | 73 | 64 kB | 1 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | -- | -- | 74 | 32 kB | 1 | 1 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | -- | 320 | 128 kB | 1 | 1 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | -- | 215 | 384 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | 213 | 384 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | 214 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | 216 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | 217 | 384 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | 218 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | 219 | 384 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | 220 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | 257 | 344 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | 258 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | 285 | 952 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | 286 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | 302 | 952 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | 303 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | 321 | 32 kB | 1 | 1 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | -- | 310 | 344 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | 311 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | 292 | 952 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | 293 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | 308 | 952 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | 309 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | 318 | 208 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | 319 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | 328 | 10276 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | 329 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | 342 | 480 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | 343 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | 326 | 10276 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | 327 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | 348 | 10276 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | 349 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | 316 | 208 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | 317 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | 340 | 480 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | 341 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | 324 | 10276 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | 325 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | 314 | 208 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | 315 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | 322 | 10276 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | 323 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | 338 | 480 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | 339 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | 312 | 208 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | 313 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | 332 | 752 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | 333 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | 330 | 752 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | 331 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | 336 | 480 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | 334 | 752 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | 335 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | 337 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | 288 | 952 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | 289 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | 290 | 952 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | 291 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | 306 | 952 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | 307 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | 433 | 10276 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | 434 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | 304 | 952 kB | 2 | 0 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | -- | -- | -- | -- | -- | 1( 0) refs | -- | 305 | 32 kB | 2 | 2 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | 155 | 4 kB | 1 | 1 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | 156 | 4 kB | 1 | 1 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | 157 | 256 kB | 1 | 1 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | -- | 158 | 4 kB | 1 | 1 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | 159 | 4 kB | 1 | 1 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | 160 | 256 kB | 1 | 1 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | -- | 164 | 4 kB | 1 | 1 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | 165 | 2048 kB | 1 | 1 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | -- | 162 | 12 kB | 1 | 1 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | -- | 166 | 14400 kB | 1 | 1 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- | 167 | 32 kB | 1 | 1 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1( 1) refs | -- | -- | -- |------------------------------------TOTALS 143012 kB | n/a | n/a | 8 kB | 692 kB | 8 kB | 4 kB | 32 kB | 4 kB | 8 kB | 10368 kB | 8 kB | 8 kB | 24 kB | 8 kB | 125124 kB | 264 kB | 264 kB | 2052 kB | 12 kB | 14432 kB | 20616 kB | 54464 kB | 2416 kB |
上述dump说明：
- Fd Ref Counts ：表示该FD有多少个进程在引用
- Map Ref Counts：表示该FD当前有多少个进程已经做过Map
- FD( Map) refs : 该进程持有该Buffer的参考计数的总数量以及Map的总次数
Dump整个系统DMA-BUF per-buffer, per-exporter and per-device statistics
在kernel版本>= 5.10上生效。
执行：dmabuf_dump -b
会从sysfs(/sys/kernel/dmabuf/buffers)中dump dmabuf统计信息，显示如下内容：
wj@wj:~/Downloads$ adb shellaurora:/ # dmabuf_dump -b----------------------- DMA-BUF per-buffer stats ----------------------- Dmabuf Inode | Size(bytes) | Exporter Name | 2262 |10522624 | qcom,system 2017 |753664 | system 1372 |4096 | system 315 |32768 | qcom,system 17 |3141632 | qcom,system 343 |32768 | qcom,system 220 |32768 | qcom,system 164 |4096 | qcom,qseecom 45 |8192 | qcom,qseecom 305 |32768 | qcom,system 73 |65536 | qcom,system 154 |32768 | system 663 |32768 | qcom,system 7 |20480 | qcom,qseecom 2270 |770048 | qcom,system 2025 |151552 | system 1342 |7012352 | system 2260 |10522624 | qcom,system 172 |20480 | qcom,system 313 |32768 | qcom,system 257 |352256 | qcom,system 134 |4096 | system 341 |32768 | qcom,system 285 |974848 | qcom,system 219 |393216 | qcom,system 162 |12288 | qcom,qseecom 2005 |4096 | system 43 |1200128 | qcom,system 303 |32768 | qcom,system 2033 |4096 | system 1501 |10522624 | qcom,system 71 |4096 | system 152 |10522624 | qcom,system 5 |20480 | qcom,qseecom 2269 |32768 | qcom,system 321 |32768 | qcom,system 1010 |4096 | system 293 |32768 | qcom,system 170 |20480 | qcom,system 311 |32768 | qcom,system 13 |28672 | qcom,qseecom 217 |393216 | qcom,system 2249 |32768 | qcom,system 160 |262144 | system 1359 |1048576 | system 1952 |10444800 | qcom,system 1019 |151552 | system 3 |4096 | qcom,system 2267 |32768 | qcom,system 291 |32768 | qcom,system 1367 |4096 | system 78 |4096 | system 11 |28672 | qcom,qseecom 338 |491520 | qcom,system 215 |393216 | qcom,system 2247 |32768 | qcom,system 724 |4096 | system 668 |10522624 | qcom,system 2275 |32768 | qcom,system 1017 |753664 | system 1 |3133440 | qcom,system 2265 |32768 | qcom,system 318 |212992 | qcom,system 167 |32768 | qcom,system 48 |4096 | system 308 |974848 | qcom,system 336 |491520 | qcom,system 213 |393216 | qcom,system 157 |262144 | system 996 |4096 | system 2273 |32768 | qcom,system 2263 |32768 | qcom,system 2018 |106496 | system 316 |212992 | qcom,system 18 |1048576 | qcom,system 288 |974848 | qcom,system 165 |2097152 | qcom,qseecom 2008 |7012352 | system 46 |8192 | qcom,qseecom 1363 |33554432 | system 306 |974848 | qcom,system 74 |32768 | qcom,system 155 |4096 | system 2187 |10444800 | qcom,system 664 |10522624 | qcom,system 36 |24576 | qcom,qseecom 8 |20480 | qcom,qseecom 2271 |32768 | qcom,system 2261 |32768 | qcom,system 1371 |4096 | system 314 |212992 | qcom,system 258 |32768 | qcom,system 135 |4096 | system 16 |4096 | qcom,qseecom 342 |491520 | qcom,system 286 |32768 | qcom,system 729 |753664 | system 304 |974848 | qcom,system 2034 |4096 | system 1502 |32768 | qcom,system 72 |4096 | system 153 |32768 | qcom,system 662 |10522624 | qcom,system 6 |20480 | qcom,qseecom 1011 |4096 | system 171 |20480 | qcom,system 312 |212992 | qcom,system 340 |491520 | qcom,system 218 |32768 | qcom,system 727 |4423680 | system 2004 |4096 | system 302 |974848 | qcom,system 1953 |32768 | qcom,system 4 |28672 | qcom,qseecom 2268 |10522624 | qcom,system 320 |131072 | qcom,system 292 |974848 | qcom,system 310 |352256 | qcom,system 79 |4096 | system 12 |4096 | qcom,qseecom 339 |32768 | qcom,system 216 |32768 | qcom,system 2248 |10522624 | qcom,system 725 |4096 | system 669 |32768 | qcom,system 2 |4096 | qcom,system 2266 |10522624 | qcom,system 319 |32768 | qcom,system 1460 |73728 | qcom,system 290 |974848 | qcom,system 733 |33554432 | system 309 |32768 | qcom,system 2039 |4096 | system 10 |20480 | qcom,qseecom 337 |32768 | qcom,system 214 |32768 | qcom,system 2246 |10444800 | qcom,system 158 |4096 | system 723 |4096 | system 2274 |770048 | qcom,system 2029 |33554432 | system 2264 |10522624 | qcom,system 57 |4096 | qcom,qseecom 317 |32768 | qcom,system 1459 |2506752 | qcom,system 289 |32768 | qcom,system 166 |14745600 | qcom,system 731 |151552 | system 47 |4096 | system 307 |32768 | qcom,system 1958 |4096 | system 156 |4096 | system 2188 |32768 | qcom,system 665 |32768 | qcom,system 9 |516096 | qcom,qseecom 2272 |770048 | qcom,system ----------------------- DMA-BUF exporter stats ----------------------- Exporter Name | Total Count | Total Size(bytes) | qcom,system | 95| 189779968 system | 43| 123645952 qcom,qseecom | 18| 2871296----------------------- DMA-BUF total stats --------------------------Total DMA-BUF count: 156, Total DMA-BUF size(bytes): 316297216
DMA_BUF 在内核中的实现
源代码位置：kernel_platform/msm-kernel/drivers/dma-buf/
这篇文章不深入这块内容，后面有时间可以专门写文章进行深入分析。
dmabuf_dump原理分析
源码路径：
system/memory/libmeminfo/libdmabufinfo/
DmaBuffer
DmaBuffer结构体定义如下：
struct DmaBuffer { public: DmaBuffer(ino_t inode, uint64_t size, uint64_t count, const std::string& exporter, const std::string& name) : inode_(inode), size_(size), count_(count), exporter_(exporter), name_(name) { total_refs_ = 0; } DmaBuffer() = default; ~DmaBuffer() = default; // Adds one file descriptor reference for the given pid void AddFdRef(pid_t pid) { AddRefToPidMap(pid, &fdrefs_); total_refs_++; } // Adds one map reference for the given pid void AddMapRef(pid_t pid) { AddRefToPidMap(pid, &maprefs_); total_refs_++; } // Getters for each property uint64_t size() const { return size_; } const std::unordered_map& fdrefs() const { return fdrefs_; } const std::unordered_map& maprefs() const { return maprefs_; } ino_t inode() const { return inode_; } uint64_t total_refs() const { return total_refs_; } uint64_t count() const { return count_; }; const std::set& pids() const { return pids_; } const std::string& name() const { return name_; } const std::string& exporter() const { return exporter_; } void SetName(const std::string& name) { name_ = name; } void SetExporter(const std::string& exporter) { exporter_ = exporter; } void SetCount(uint64_t count) { count_ = count; } uint64_t Pss() const { return size_ / pids_.size(); } bool operator==(const DmaBuffer& rhs) { return (inode_ == rhs.inode()) && (size_ == rhs.size()) && (name_ == rhs.name()) && (exporter_ == rhs.exporter()); } private: ino_t inode_; uint64_t size_; uint64_t count_; uint64_t total_refs_; std::set pids_; std::string exporter_; std::string name_; std::unordered_map fdrefs_; std::unordered_map maprefs_; void AddRefToPidMap(pid_t pid, std::unordered_map* map) { // The first time we find a ref, we set the ref count to 1 // otherwise, increment the existing ref count auto [it, inserted] = map->insert(std::make_pair(pid, 1)); if (!inserted) it->second++; pids_.insert(pid); }};主要成员变量
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name_ : 该dmabuf的name，如果读不到name，默认为 ‘’
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pids_: 有dup或map该dmabuf的pid 集合。
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count_: fdinfo里面的count，目前看dambuf_dump并没有用。
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size_: 该dmabuf占用的内存大小，单位是byte。
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inode_: 该dmabuf的inode。
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exporter_: 申请该dmabuf的name，如果读不到name，默认为'’。
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total_refs_: fdrefs 个数 + maprefs 个数，目前看dambuf_dump并没有用。
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fdrefs_: 有open或dup该dmabuf的pid集合。注：一个pid对同一个dmabuf(inode)可能有多个reference。
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maprefs_: 有map该dmabuf的pid集合。注：一个pid对同一个dmabuf(inode)可能有多个reference。
FD和Inode的关系
为了实现buffer的共享，在内核中将DMA-BUF将buffer与file关联起来，一个Buffer对应唯一一个File,一个File对应唯一一个 inode,将这个file的fd返回给应用层,通过binder实现进程之间的fd传递(dup)，进而拿到唯一的File 和 Buffer。
dump整个系统流程原理
直接执行dmabuf_dump会dump 整个系统的dmabuf 信息，代码执行流程如下：
ReadDmaBufFdRefs
// Public methodsbool ReadDmaBufFdRefs(int pid, std::vector* dmabufs, const std::string& procfs_path) { constexpr char permission_err_msg[] = "Failed to read fdinfo - requires either PTRACE_MODE_READ or root depending on " "the device kernel"; static bool logged_permission_err = false; std::string fdinfo_dir_path = ::android::base::StringPrintf("%s/%d/fdinfo", procfs_path.c_str(), pid); std::unique_ptr dir(opendir(fdinfo_dir_path.c_str()), &closedir); if (!dir) { // Don't log permission errors to reduce log spam on devices where fdinfo // of other processes can only be read by root. if (errno != EACCES) { PLOG(ERROR) begin(), dmabufs->end(), [&mapinfo](const DmaBuffer& dbuf) { return dbuf.inode() == mapinfo.inode; }); if (buf != dmabufs->end()) { buf->AddMapRef(pid); return; } // We have a new buffer, but unknown count and name and exporter name // Try to lookup exporter name in sysfs std::string exporter; bool sysfs_stats = ReadBufferExporter(mapinfo.inode, &exporter, dmabuf_sysfs_path); if (!sysfs_stats) { exporter = ""; } // Using the VMA range as the size of the buffer can be misleading, // due to partially mapped buffers or VMAs that extend beyond the // buffer size. // // Attempt to retrieve the real buffer size from sysfs. uint64_t size = 0; if (!sysfs_stats || !ReadBufferSize(mapinfo.inode, &size, dmabuf_sysfs_path)) { size = mapinfo.end - mapinfo.start; } DmaBuffer& dbuf = dmabufs->emplace_back(mapinfo.inode, size, 0, exporter, ""); dbuf.AddMapRef(pid); }; for (std::string line; getline(fp, line);) { if (!::android::procinfo::ReadMapFileContent(line.data(), account_dmabuf)) { LOG(ERROR) allocate(heap, len, fd_flags, heap_flags);trace_dmabuf_alloc(dmabuf->exp_name, heap->name, len, file_inode(dmabuf->file)->i_ino);return dmabuf;}EXPORT_SYMBOL_GPL(dma_heap_buffer_alloc);int dma_heap_bufferfd_alloc(struct dma_heap *heap, size_t len, unsigned int fd_flags, unsigned int heap_flags){struct dma_buf *dmabuf;int fd;dmabuf = dma_heap_buffer_alloc(heap, len, fd_flags, heap_flags);if (IS_ERR(dmabuf))return PTR_ERR(dmabuf);fd = dma_buf_fd(dmabuf, fd_flags);if (fd private_data = heap;nonseekable_open(inode, file);return 0;}static long dma_heap_ioctl_allocate(struct file *file, void *data){struct dma_heap_allocation_data *heap_allocation = data;struct dma_heap *heap = file->private_data;int fd;if (heap_allocation->fd)return -EINVAL;fd = dma_heap_bufferfd_alloc(heap, heap_allocation->len, heap_allocation->fd_flags, heap_allocation->heap_flags);if (fd fd = fd;return 0;}static unsigned int dma_heap_ioctl_cmds[] = {DMA_HEAP_IOCTL_ALLOC,};static long dma_heap_ioctl(struct file *file, unsigned int ucmd, unsigned long arg){char stack_kdata[128];char *kdata = stack_kdata;unsigned int kcmd;unsigned int in_size, out_size, drv_size, ksize;int nr = _IOC_NR(ucmd);int ret = 0;if (nr >= ARRAY_SIZE(dma_heap_ioctl_cmds))return -EINVAL;/* Get the kernel ioctl cmd that matches */kcmd = dma_heap_ioctl_cmds[nr];/* Figure out the delta between user cmd size and kernel cmd size */drv_size = _IOC_SIZE(kcmd);out_size = _IOC_SIZE(ucmd);in_size = out_size;if ((ucmd & kcmd & IOC_IN) == 0)in_size = 0;if ((ucmd & kcmd & IOC_OUT) == 0)out_size = 0;ksize = max(max(in_size, out_size), drv_size);/* If necessary, allocate buffer for ioctl argument */if (ksize > sizeof(stack_kdata)) {kdata = kmalloc(ksize, GFP_KERNEL);if (!kdata)return -ENOMEM;}if (copy_from_user(kdata, (void __user *)arg, in_size) != 0) {ret = -EFAULT;goto err;}/* zero out any difference between the kernel/user structure size */if (ksize > in_size)memset(kdata + in_size, 0, ksize - in_size);switch (kcmd) {case DMA_HEAP_IOCTL_ALLOC:ret = dma_heap_ioctl_allocate(file, kdata);break;default:ret = -ENOTTY;goto err;}if (copy_to_user((void __user *)arg, kdata, out_size) != 0)ret = -EFAULT;err:if (kdata != stack_kdata)kfree(kdata);return ret;}static const struct file_operations dma_heap_fops = {.owner = THIS_MODULE,.open= dma_heap_open,.unlocked_ioctl = dma_heap_ioctl,#ifdef CONFIG_COMPAT.compat_ioctl= dma_heap_ioctl,#endif};/** * dma_heap_get_drvdata() - get per-subdriver data for the heap * @heap: DMA-Heap to retrieve private data for * * Returns: * The per-subdriver data for the heap. */void *dma_heap_get_drvdata(struct dma_heap *heap){return heap->priv;}EXPORT_SYMBOL_GPL(dma_heap_get_drvdata);static void dma_heap_release(struct kref *ref){struct dma_heap *heap = container_of(ref, struct dma_heap, refcount);int minor = MINOR(heap->heap_devt);/* Note, we already holding the heap_list_lock here */list_del(&heap->list);device_destroy(dma_heap_class, heap->heap_devt);cdev_del(&heap->heap_cdev);xa_erase(&dma_heap_minors, minor);kfree(heap);}void dma_heap_put(struct dma_heap *h){/* * Take the heap_list_lock now to avoid racing with code * scanning the list and then taking a kref. */mutex_lock(&heap_list_lock);kref_put(&h->refcount, dma_heap_release);mutex_unlock(&heap_list_lock);}EXPORT_SYMBOL_GPL(dma_heap_put);/** * dma_heap_get_dev() - get device struct for the heap * @heap: DMA-Heap to retrieve device struct from * * Returns: * The device struct for the heap. */struct device *dma_heap_get_dev(struct dma_heap *heap){return heap->heap_dev;}EXPORT_SYMBOL_GPL(dma_heap_get_dev);/** * dma_heap_get_name() - get heap name * @heap: DMA-Heap to retrieve private data for * * Returns: * The char* for the heap name. */const char *dma_heap_get_name(struct dma_heap *heap){return heap->name;}EXPORT_SYMBOL_GPL(dma_heap_get_name);struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info){struct dma_heap *heap, *err_ret;unsigned int minor;int ret;if (!exp_info->name || !strcmp(exp_info->name, "")) {pr_err("dma_heap: Cannot add heap without a name\n");return ERR_PTR(-EINVAL);}if (!exp_info->ops || !exp_info->ops->allocate) {pr_err("dma_heap: Cannot add heap with invalid ops struct\n");return ERR_PTR(-EINVAL);}/* check the name is unique */heap = dma_heap_find(exp_info->name);if (heap) {pr_err("dma_heap: Already registered heap named %s\n", exp_info->name);dma_heap_put(heap);return ERR_PTR(-EINVAL);}heap = kzalloc(sizeof(*heap), GFP_KERNEL);if (!heap)return ERR_PTR(-ENOMEM);kref_init(&heap->refcount);heap->name = exp_info->name;heap->ops = exp_info->ops;heap->priv = exp_info->priv;/* Find unused minor number */ret = xa_alloc(&dma_heap_minors, &minor, heap, XA_LIMIT(0, NUM_HEAP_MINORS - 1), GFP_KERNEL);if (ret heap_devt = MKDEV(MAJOR(dma_heap_devt), minor);cdev_init(&heap->heap_cdev, &dma_heap_fops);ret = cdev_add(&heap->heap_cdev, heap->heap_devt, 1);if (ret heap_dev = device_create(dma_heap_class, NULL, heap->heap_devt, NULL, heap->name);if (IS_ERR(heap->heap_dev)) {pr_err("dma_heap: Unable to create device\n");err_ret = ERR_CAST(heap->heap_dev);goto err2;}/* Make sure it doesn't disappear on us */heap->heap_dev = get_device(heap->heap_dev);/* Add heap to the list */mutex_lock(&heap_list_lock);list_add(&heap->list, &heap_list);mutex_unlock(&heap_list_lock);return heap;err2:cdev_del(&heap->heap_cdev);err1:xa_erase(&dma_heap_minors, minor);err0:kfree(heap);return err_ret;}EXPORT_SYMBOL_GPL(dma_heap_add);static char *dma_heap_devnode(struct device *dev, umode_t *mode){return kasprintf(GFP_KERNEL, "dma_heap/%s", dev_name(dev));}static ssize_t total_pools_kb_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf){struct dma_heap *heap;u64 total_pool_size = 0;mutex_lock(&heap_list_lock);list_for_each_entry(heap, &heap_list, list) {if (heap->ops->get_pool_size)total_pool_size += heap->ops->get_pool_size(heap);}mutex_unlock(&heap_list_lock);return sysfs_emit(buf, "%llu\n", total_pool_size / 1024);}static struct kobj_attribute total_pools_kb_attr =__ATTR_RO(total_pools_kb);static struct attribute *dma_heap_sysfs_attrs[] = {&total_pools_kb_attr.attr,NULL,};ATTRIBUTE_GROUPS(dma_heap_sysfs);static struct kobject *dma_heap_kobject;static int dma_heap_sysfs_setup(void){int ret;dma_heap_kobject = kobject_create_and_add("dma_heap", kernel_kobj);if (!dma_heap_kobject)return -ENOMEM;ret = sysfs_create_groups(dma_heap_kobject, dma_heap_sysfs_groups);if (ret) {kobject_put(dma_heap_kobject);return ret;}return 0;}static void dma_heap_sysfs_teardown(void){kobject_put(dma_heap_kobject);}static int dma_heap_init(void){int ret;ret = dma_heap_sysfs_setup();if (ret)return ret;ret = alloc_chrdev_region(&dma_heap_devt, 0, NUM_HEAP_MINORS, DEVNAME);if (ret)goto err_chrdev;dma_heap_class = class_create(THIS_MODULE, DEVNAME);if (IS_ERR(dma_heap_class)) {ret = PTR_ERR(dma_heap_class);goto err_class;}dma_heap_class->devnode = dma_heap_devnode;return 0;err_class:unregister_chrdev_region(dma_heap_devt, NUM_HEAP_MINORS);err_chrdev:dma_heap_sysfs_teardown();return ret;}subsys_initcall(dma_heap_init);include/trace/events/dma_buf.h
/* SPDX-License-Identifier: GPL-2.0 */#undef TRACE_SYSTEM#define TRACE_SYSTEM dma_buf#if !defined(_TRACE_DMA_BUF_H) || defined(TRACE_HEADER_MULTI_READ)#define _TRACE_DMA_BUF_H#include #include TRACE_EVENT(dmabuf_alloc, TP_PROTO(const char *string1, const char *string2, uint64_t val1, uint64_t val2), TP_ARGS(string1, string2, val1, val2), TP_STRUCT__entry( __string(string1, string1) __string(string2, string2) __field(uint64_t, val1) __field(uint64_t, val2) ), TP_fast_assign( __assign_str(string1, string1); __assign_str(string2, string2); __entry->val1 = val1; __entry->val2 = val2; ), TP_printk( "%s: %s Len=%llu Inode=%llu", __get_str(string1), __get_str(string2), __entry->val1, __entry->val2 ));#endif /* _TRACE_DMA_BUF_H *//* This part must be outside protection */#include
使用simpleperf抓取dmabuf申请点所有backtrace
perf_cam_log.sh
#!/bin/bashadb root; adb remountlocal_path=$(date +%F_%H%M%S)#pid=$(adb shell ps | grep camera.provider | awk '{print }')pid_app=$(adb shell ps | grep com.android.camera | awk '{print }')pid_server=$(adb shell ps | grep -Eia "cameraserver$" | awk '{print }')pid_provider=$(adb shell ps | grep camera.provider | awk '{print }')pid_allocate=$(adb shell ps | grep vendor.qti.hardware.display.allocator-service | awk '{print }')pid_hidl=$(adb shell ps | grep android.hidl.allocator@1.0-service | awk '{print }')mkdir $local_pathecho "Begin to catch perf data..."if [ ! -n "" ] ;then adb shell "simpleperf record -e camera:cam_log_event,dma_buf:dmabuf_alloc -p $pid_app,$pid_server,$pid_provider,$pid_allocate,$pid_hidl --call-graph dwarf --duration 20 -o /data/local/tmp/perf.data"else adb shell "simpleperf record -e camera:cam_log_event,dma_buf:dmabuf_alloc -p $pid,$pid_server,$pid_provider,$pid_allocate,$pid_hidl --call-graph dwarf --duration -o /data/local/tmp/perf.data"fiecho "Complete"adb shell "simpleperf report -i /data/local/tmp/perf.data" > $local_path/perf.txtadb shell "simpleperf report -i /data/local/tmp/perf.data -g --full-callgraph" > $local_path/perf_callgraph.txtadb pull /data/local/tmp/perf.data $local_pathpython3 scripts/report_sample.py $local_path/perf.data --show_tracing_data > $local_path/perf_trace_report.txt执行./perf_cam_log.sh
操作一遍复现步骤就可以抓到dmabuf申请点所有backtrace。
举例
打开perf_trace_report.txt
搜索inode “348915”找到：
HwBinder:30618_ 31356 [006] 1876.000000: 1 dma_buf:dmabuf_alloc:
ffffffe8c67a714c dma_heap_buffer_alloc ([kernel.kallsyms])
ffffffe8c67a714a dma_heap_buffer_alloc ([kernel.kallsyms])
ffffffe8c67a798a dma_heap_ioctl ([kernel.kallsyms])
ffffffe8c5f88dda __arm64_sys_ioctl ([kernel.kallsyms])
ffffffe8c5a8a4d6 el0_svc_common ([kernel.kallsyms])
ffffffe8c725e272 el0_svc ([kernel.kallsyms])
ffffffe8c725e1e6 el0_sync_handler ([kernel.kallsyms])
ffffffe8c5a120be el0_sync ([kernel.kallsyms])
7c7fe1dc0c __ioctl (/apex/com.android.runtime/lib64/bionic/libc.so)
7c7fdd784c ioctl (/apex/com.android.runtime/lib64/bionic/libc.so)
796f39b020 BufferAllocator::DmabufAlloc(std::__1::basic_string const&, unsigned long) (/apex/com.android.vndk.v31/lib64/libdmabufhe
796f39b26c BufferAllocator::Alloc(std::__1::basic_string const&, unsigned long, unsigned int, unsigned long) (/apex/com.android.vnd
796f39e1bc DmabufHeapAlloc (/apex/com.android.vndk.v31/lib64/libdmabufheap.so)
796b8ce17c rpcmem_alloc_internal (/vendor/lib64/libcdsprpc.so)
796b8cc628 apps_mem_request_map64 (/vendor/lib64/libcdsprpc.so)
796b8cce9c apps_mem_skel_invoke.cfi (/vendor/lib64/libcdsprpc.so)
796b8c46c0 listener_start_thread.cfi (/vendor/lib64/libcdsprpc.so)
7c7fe329a4 __pthread_start(void*) (/apex/com.android.runtime/lib64/bionic/libc.so)
tracing data:
common_type : 693
common_flags : 0
common_preempt_count : 1
common_pid : 31356
string1 : system
string2 : system
val1 : 4096
val2 : 348915
上面的信息就是泄漏点的backtrace。
基于上面点可以看到是libcdsprpc.so内部泄漏，那接下来就需要看到底哪些算法使用到cdsp
Android 中 gralloc buffer和image buffer底层都是基于 dma_buf来实现的。
Provider进程基于vendor.qti.hardware.display.allocator-service申请驻留分析
libdmabufheaps.so
platform/system/memory/libdmabufheap
Android.bp
//// Copyright (C) 2020 The Android Open Source Project//// Licensed under the Apache License, Version 2.0 (the "License");// you may not use this file except in compliance with the License.// You may obtain a copy of the License at//// http://www.apache.org/licenses/LICENSE-2.0//// Unless required by applicable law or agreed to in writing, software// distributed under the License is distributed on an "AS IS" BASIS,// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.// See the License for the specific language governing permissions and// limitations under the License.//package { default_applicable_licenses: ["Android-Apache-2.0"],}cc_library { srcs: [ "BufferAllocator.cpp", "BufferAllocatorWrapper.cpp", ], name: "libdmabufheap", vendor_available: true, vndk: { enabled: true, support_system_process: true, }, // Added because codec2 is double_loadable. // See b/147147883, b/147147992 double_loadable:true, apex_available: [ "//apex_available:platform", "//apex_available:anyapex", ], min_sdk_version: "29", cflags: [ "-Wall", "-Werror", ], local_include_dirs: [ "include", ], export_include_dirs: [ "include", ], static_libs: [ "libbase", "libion", "libutils", ], shared_libs: [ "libcutils", "liblog", ], export_static_lib_headers: [ "libbase", "libion", ],}BufferAllocator.cpp
/* * Copyright (C) 2020 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */#define LOG_TAG "DMABUFHEAPS"#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define ATRACE_TAG ATRACE_TAG_ALWAYS#include #include static constexpr char kDmaHeapRoot[] = "/dev/dma_heap/";static constexpr char kIonDevice[] = "/dev/ion";static constexpr char kIonSystemHeapName[] = "ion_system_heap";void BufferAllocator::LogInterface(const std::string& interface) { if (!logged_interface_) { LOG(INFO) second; std::string heap_path = kDmaHeapRoot + heap_name; int fd = TEMP_FAILURE_RETRY(open(heap_path.c_str(), O_RDONLY | O_CLOEXEC)); if (fd
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