本文主要是介绍Android Perfetto 性能分析，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
Perfetto是Android为我们提供的性能分析工具，网上已经有很多文章来介绍这个工具了，这里就不再赘述，仅贴几篇我觉得有用的文章/网站在此记录：
- systrace/perfetto中需要actrace打tag相关方法
- 常用的SQL查询
- perfetto ui
perfetto命令可能用到的参数可以用 -h 查询到，我们常用的是 -o、-t、-b
$ perfetto -h
[307.548] perfetto_cmd.cc:187
Usage: perfetto--background -d : Exits immediately and continues tracing inbackground--config -c : /path/to/trace/config/file or - for stdin--out -o : /path/to/out/trace/file or - for stdout--upload : Upload field trace (Android only)--dropbox TAG : DEPRECATED: Use --upload insteadTAG should always be set to 'perfetto'--no-guardrails : Ignore guardrails triggered when using --dropbox(for testing).--txt : Parse config as pbtxt. Not for production use.Not a stable API.--reset-guardrails : Resets the state of the guardails and exits(for testing).--query : Queries the service state and prints it ashuman-readable text.--query-raw : Like --query, but prints raw proto-encoded bytesof tracing_service_state.proto.--help -hlight configuration flags: (only when NOT using -c/--config)--time -t : Trace duration N[s,m,h] (default: 10s)--buffer -b : Ring buffer size N[mb,gb] (default: 32mb)--size -s : Max file size N[mb,gb] (default: in-memory ring-buffer only)ATRACE_CAT : Record ATRACE_CAT (e.g. wm)FTRACE_GROUP/FTRACE_NAME : Record ftrace event (e.g. sched/sched_switch)FTRACE_GROUP/* : Record all events in group (e.g. sched/*)statsd-specific flags:--alert-id : ID of the alert that triggered this trace.--config-id : ID of the triggering config.--config-uid : UID of app which registered the config.--subscription-id : ID of the subscription that triggered this trace.Detach mode. DISCOURAGED, read https://docs.perfetto.dev/#/detached-mode :--detach=key : Detach from the tracing session with the given key.--attach=key [--stop] : Re-attach to the session (optionally stop tracing once reattached).--is_detached=key : Check if the session can be re-attached (0:Yes, 2:No, 1:Error).常用的抓 perfetto 的命令如下：
$ adb shell perfetto -o /data/misc/perfetto-traces/trace.file -t 30s am adb aidl dalvik audio binder_lock binder_driver bionic camera database gfx hal input network nnapi pm power rs res rro sm ss vibrator video webview wm sched freq dalvik
命令后面跟着的 am、adb、aidl、dalvik，查询网上的资料我们可以知道这些都是ATRACE_CAT。
我们自己在添加 trace point时，需要先添加ATRACE_TAG ，例如：
#define ATRACE_TAG ATRACE_TAG_GRAPHICS
我理解的是这个文件中所有的 trace 都属于 GRAPHIC 组，那么到底有哪些组呢？
参考 system/core/libcutils/include/cutils/trace.h
#define ATRACE_TAG_NEVER 0 // This tag is never enabled.
#define ATRACE_TAG_ALWAYS (1<<0) // This tag is always enabled.
#define ATRACE_TAG_GRAPHICS (1<<1)
#define ATRACE_TAG_INPUT (1<<2)
#define ATRACE_TAG_VIEW (1<<3)
#define ATRACE_TAG_WEBVIEW (1<<4)
#define ATRACE_TAG_WINDOW_MANAGER (1<<5)
#define ATRACE_TAG_ACTIVITY_MANAGER (1<<6)
#define ATRACE_TAG_SYNC_MANAGER (1<<7)
#define ATRACE_TAG_AUDIO (1<<8)
#define ATRACE_TAG_VIDEO (1<<9)
#define ATRACE_TAG_CAMERA (1<<10)
#define ATRACE_TAG_HAL (1<<11)
#define ATRACE_TAG_APP (1<<12)
#define ATRACE_TAG_RESOURCES (1<<13)
#define ATRACE_TAG_DALVIK (1<<14)
#define ATRACE_TAG_RS (1<<15)
#define ATRACE_TAG_BIONIC (1<<16)
#define ATRACE_TAG_POWER (1<<17)
#define ATRACE_TAG_PACKAGE_MANAGER (1<<18)
#define ATRACE_TAG_SYSTEM_SERVER (1<<19)
#define ATRACE_TAG_DATABASE (1<<20)
#define ATRACE_TAG_NETWORK (1<<21)
#define ATRACE_TAG_ADB (1<<22)
#define ATRACE_TAG_VIBRATOR (1<<23)
#define ATRACE_TAG_AIDL (1<<24)
#define ATRACE_TAG_NNAPI (1<<25)
#define ATRACE_TAG_RRO (1<<26)
#define ATRACE_TAG_LAST ATRACE_TAG_RRO
添加 ATRACE_TAG 后我们要如何使用命令抓到这个TAG呢？我们需要在命令中指定组才能抓到相关的信息，那么在命令中我们应该如何指定呢？
可以参考 frameworks/native/cmds/atrace/atrace.cpp，里面定义有所有的 ATRACE_CAT，前面的name也就是我们要在cmd中指定的：
static const TracingCategory k_categories[] = {{ "gfx", "Graphics", ATRACE_TAG_GRAPHICS, { } },{ "input", "Input", ATRACE_TAG_INPUT, { } },{ "view", "View System", ATRACE_TAG_VIEW, { } },{ "webview", "WebView", ATRACE_TAG_WEBVIEW, { } },{ "wm", "Window Manager", ATRACE_TAG_WINDOW_MANAGER, { } },{ "am", "Activity Manager", ATRACE_TAG_ACTIVITY_MANAGER, { } },{ "sm", "Sync Manager", ATRACE_TAG_SYNC_MANAGER, { } },{ "audio", "Audio", ATRACE_TAG_AUDIO, { } },{ "video", "Video", ATRACE_TAG_VIDEO, { } },{ "camera", "Camera", ATRACE_TAG_CAMERA, { } },{ "hal", "Hardware Modules", ATRACE_TAG_HAL, { } },{ "res", "Resource Loading", ATRACE_TAG_RESOURCES, { } },{ "dalvik", "Dalvik VM", ATRACE_TAG_DALVIK, { } },{ "rs", "RenderScript", ATRACE_TAG_RS, { } },{ "bionic", "Bionic C Library", ATRACE_TAG_BIONIC, { } },{ "power", "Power Management", ATRACE_TAG_POWER, { } },{ "pm", "Package Manager", ATRACE_TAG_PACKAGE_MANAGER, { } },{ "ss", "System Server", ATRACE_TAG_SYSTEM_SERVER, { } },{ "database", "Database", ATRACE_TAG_DATABASE, { } },{ "network", "Network", ATRACE_TAG_NETWORK, { } },{ "adb", "ADB", ATRACE_TAG_ADB, { } },{ "vibrator", "Vibrator", ATRACE_TAG_VIBRATOR, { } },{ "aidl", "AIDL calls", ATRACE_TAG_AIDL, { } },{ "nnapi", "NNAPI", ATRACE_TAG_NNAPI, { } },{ "rro", "Runtime Resource Overlay", ATRACE_TAG_RRO, { } },{ k_coreServiceCategory, "Core services", 0, { } },{ k_pdxServiceCategory, "PDX services", 0, { } },{ "sched", "CPU Scheduling", 0, {{ REQ, "events/sched/sched_switch/enable" },{ REQ, "events/sched/sched_wakeup/enable" },{ OPT, "events/sched/sched_waking/enable" },{ OPT, "events/sched/sched_blocked_reason/enable" },{ OPT, "events/sched/sched_cpu_hotplug/enable" },{ OPT, "events/sched/sched_pi_setprio/enable" },{ OPT, "events/sched/sched_process_exit/enable" },{ OPT, "events/cgroup/enable" },{ OPT, "events/oom/oom_score_adj_update/enable" },{ OPT, "events/task/task_rename/enable" },{ OPT, "events/task/task_newtask/enable" },} },{ "irq", "IRQ Events", 0, {{ REQ, "events/irq/enable" },{ OPT, "events/ipi/enable" },} },{ "irqoff", "IRQ-disabled code section tracing", 0, {{ REQ, "events/preemptirq/irq_enable/enable" },{ REQ, "events/preemptirq/irq_disable/enable" },} },{ "preemptoff", "Preempt-disabled code section tracing", 0, {{ REQ, "events/preemptirq/preempt_enable/enable" },{ REQ, "events/preemptirq/preempt_disable/enable" },} },{ "i2c", "I2C Events", 0, {{ REQ, "events/i2c/enable" },{ REQ, "events/i2c/i2c_read/enable" },{ REQ, "events/i2c/i2c_write/enable" },{ REQ, "events/i2c/i2c_result/enable" },{ REQ, "events/i2c/i2c_reply/enable" },{ OPT, "events/i2c/smbus_read/enable" },{ OPT, "events/i2c/smbus_write/enable" },{ OPT, "events/i2c/smbus_result/enable" },{ OPT, "events/i2c/smbus_reply/enable" },} },{ "freq", "CPU Frequency", 0, {{ REQ, "events/power/cpu_frequency/enable" },{ OPT, "events/power/clock_set_rate/enable" },{ OPT, "events/power/clock_disable/enable" },{ OPT, "events/power/clock_enable/enable" },{ OPT, "events/clk/clk_set_rate/enable" },{ OPT, "events/clk/clk_disable/enable" },{ OPT, "events/clk/clk_enable/enable" },{ OPT, "events/power/cpu_frequency_limits/enable" },{ OPT, "events/power/suspend_resume/enable" },} },{ "membus", "Memory Bus Utilization", 0, {{ REQ, "events/memory_bus/enable" },} },{ "idle", "CPU Idle", 0, {{ REQ, "events/power/cpu_idle/enable" },} },{ "disk", "Disk I/O", 0, {{ OPT, "events/f2fs/f2fs_sync_file_enter/enable" },{ OPT, "events/f2fs/f2fs_sync_file_exit/enable" },{ OPT, "events/f2fs/f2fs_write_begin/enable" },{ OPT, "events/f2fs/f2fs_write_end/enable" },{ OPT, "events/ext4/ext4_da_write_begin/enable" },{ OPT, "events/ext4/ext4_da_write_end/enable" },{ OPT, "events/ext4/ext4_sync_file_enter/enable" },{ OPT, "events/ext4/ext4_sync_file_exit/enable" },{ REQ, "events/block/block_rq_issue/enable" },{ REQ, "events/block/block_rq_complete/enable" },} },{ "mmc", "eMMC commands", 0, {{ REQ, "events/mmc/enable" },} },{ "load", "CPU Load", 0, {{ REQ, "events/cpufreq_interactive/enable" },} },{ "sync", "Synchronization", 0, {// linux kernel < 4.9{ OPT, "events/sync/enable" },// linux kernel == 4.9.x{ OPT, "events/fence/enable" },// linux kernel > 4.9{ OPT, "events/dma_fence/enable" },} },{ "workq", "Kernel Workqueues", 0, {{ REQ, "events/workqueue/enable" },} },{ "memreclaim", "Kernel Memory Reclaim", 0, {{ REQ, "events/vmscan/mm_vmscan_direct_reclaim_begin/enable" },{ REQ, "events/vmscan/mm_vmscan_direct_reclaim_end/enable" },{ REQ, "events/vmscan/mm_vmscan_kswapd_wake/enable" },{ REQ, "events/vmscan/mm_vmscan_kswapd_sleep/enable" },{ OPT, "events/lowmemorykiller/enable" },} },{ "regulators", "Voltage and Current Regulators", 0, {{ REQ, "events/regulator/enable" },} },{ "binder_driver", "Binder Kernel driver", 0, {{ REQ, "events/binder/binder_transaction/enable" },{ REQ, "events/binder/binder_transaction_received/enable" },{ REQ, "events/binder/binder_transaction_alloc_buf/enable" },{ OPT, "events/binder/binder_set_priority/enable" },} },{ "binder_lock", "Binder global lock trace", 0, {{ OPT, "events/binder/binder_lock/enable" },{ OPT, "events/binder/binder_locked/enable" },{ OPT, "events/binder/binder_unlock/enable" },} },{ "pagecache", "Page cache", 0, {{ REQ, "events/filemap/enable" },} },{ "memory", "Memory", 0, {{ OPT, "events/mm_event/mm_event_record/enable" },{ OPT, "events/kmem/rss_stat/enable" },{ OPT, "events/kmem/ion_heap_grow/enable" },{ OPT, "events/kmem/ion_heap_shrink/enable" },{ OPT, "events/ion/ion_stat/enable" },} },
};
这篇先到这里，perfetto 文件如何分析，我们后面再聊。
这篇关于Android Perfetto 性能分析的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！
