Android ftrace

ftrace README：

××××:/sys/kernel/debug/tracing # lsREADME            buffer_size_kb       events      options        saved_cmdlines      set_event     trace_clock      trace_options   tracing_on     uprobe_profile available_events  buffer_total_size_kb free_buffer per_cpu        saved_cmdlines_size set_event_pid trace_marker     trace_pipe      tracing_thresh available_tracers current_tracer       instances   printk_formats saved_tgids         trace         trace_marker_raw tracing_cpumask uprobe_events ××××:/sys/kernel/debug/tracing # cat README                                                                                                                                         tracing mini-HOWTO:# echo 0 > tracing_on : quick way to disable tracing# echo 1 > tracing_on : quick way to re-enable tracing Important files:  trace- The static contents of the buffer  To clear the buffer write into this file: echo > trace  trace_pipe- A consuming read to see the contents of the buffer  current_tracer- function and latency tracers  available_tracers- list of configured tracers for current_tracer  buffer_size_kb- view and modify size of per cpu buffer  buffer_total_size_kb  - view total size of all cpu buffers  trace_clock-change the clock used to order events       local:   Per cpu clock but may not be synced across CPUs      global:   Synced across CPUs but slows tracing down.     counter:   Not a clock, but just an increment      uptime:   Jiffy counter from time of boot        perf:   Same clock that perf events use  trace_marker- Writes into this file writes into the kernel buffer  trace_marker_raw- Writes into this file writes binary data into the kernel buffer  tracing_cpumask- Limit which CPUs to trace  instances- Make sub-buffers with: mkdir instances/foo  Remove sub-buffer with rmdir  trace_options- Set format or modify how tracing happens  Disable an option by adding a suffix 'no' to the  option name  saved_cmdlines_size- echo command number in here to store comm-pid list  uprobe_events- Add/remove/show the userspace dynamic events  Write into this file to define/undefine new trace events.  accepts: event-definitions (one definition per line)   Format: p[:[/]]  []           r[maxactive][:[/]]  []           -:[/]    place: :     args: =fetcharg[:type] fetcharg: %, @, @[+|-],           $stack, $stack, $retval, $comm     type: s8/16/32/64, u8/16/32/64, x8/16/32/64, string,           b@/  events/- Directory containing all trace event subsystems:      enable- Write 0/1 to enable/disable tracing of all events  events//- Directory containing all trace events for :      enable- Write 0/1 to enable/disable tracing of all   events      filter- If set, only events passing filter are traced  events///- Directory containing control files for  :      enable- Write 0/1 to enable/disable tracing of       filter- If set, only events passing filter are traced      trigger- If set, a command to perform when event is hit    Format: [:count][if ]   trigger: traceon, traceoff            enable_event::            disable_event::    stacktrace   example: echo traceoff > events/block/block_unplug/trigger            echo traceoff:3 > events/block/block_unplug/trigger            echo 'enable_event:kmem:kmalloc:3 if nr_rq > 1' > \                  events/block/block_unplug/trigger   The first disables tracing every time block_unplug is hit.   The second disables tracing the first 3 times block_unplug is hit.   The third enables the kmalloc event the first 3 times block_unplug     is hit and has value of greater than 1 for the 'nr_rq' event field.   Like function triggers, the counter is only decremented if it    enabled or disabled tracing.   To remove a trigger without a count:     echo '! > //trigger   To remove a trigger with a count:     echo '!:0 > //trigger   Filters can be ignored when removing a trigger.

Subsystem：

××××:/sys/kernel/debug/tracing/events # lsalarmtimer camera     dma_fence fib6         hid   kgsl            module          page_isolation      process_reclaim rmnet     sde_rotator task            vmscan    almk       cfg80211   drm       filelock     i2c   kmem            msm_bus         pagefault           qdisc           rndis_ipa signal      thermal         wda       android_fs cgroup     dwc3      filemap      iommu lmh             msm_low_power   pagemap             random          rpm       skb         thermal_virtual workqueue asoc       clk        emulation ftrace       ion   lowmemorykiller msm_pil_event   pdc                 ras             rpmh      smbus       timer           writeback binder     cma        enable    gadget       ipa   mdio            msm_vidc_events percpu              raw_syscalls    sched     sock        udp             xdp       block      compaction exception gpio         ipi   mdss_pll        napi            perf_trace_counters rcu             scm       spi         ufs             xhci-hcd  bpf        cpuhp      ext4      header_event irq   migrate         net             power               regmap          scsi      spmi        v4l2            bridge     dfc        fib       header_page  jbd2  mmc             oom             printk              regulator       sde       swiotlb     vb2

打开 signal trace：

××××:/ # echo 1 > /sys/kernel/debug/tracing/events/signal/enable××××:/ # echo 1 > /sys/kernel/debug/tracing/tracing_on

获取 trace：

adb pull /sys/kernel/debug/tracing/trace trace.txt

查看/修改 trace buffer大小：

××××:/ # cat /sys/kernel/debug/tracing/buffer_size_kb1410××××:/ # cat /sys/kernel/debug/tracing/buffer_total_size_kb11280××××:/ # echo 2048 > /sys/kernel/debug/tracing/buffer_size_kb                                                                                                                       ××××:/ # cat /sys/kernel/debug/tracing/buffer_size_kb                                                                                                                               2048××××:/ # cat /sys/kernel/debug/tracing/buffer_total_size_kb                                                                                                                         16384

打开binder相关 trace:

# echo 1 > /sys/kernel/debug/tracing/events/binder/enable# cat /sys/kernel/debug/tracing/set_eventbinder:binder_ioctlbinder:binder_lockbinder:binder_lockedbinder:binder_unlockbinder:binder_ioctl_donebinder:binder_write_donebinder:binder_read_donebinder:binder_set_prioritybinder:binder_wait_for_workbinder:binder_transactionbinder:binder_transaction_receivedbinder:binder_transaction_node_to_refbinder:binder_transaction_ref_to_nodebinder:binder_transaction_ref_to_refbinder:binder_transaction_fdbinder:binder_transaction_alloc_bufbinder:binder_transaction_buffer_releasebinder:binder_transaction_failed_buffer_releasebinder:binder_update_page_rangebinder:binder_alloc_lru_startbinder:binder_alloc_lru_endbinder:binder_free_lru_startbinder:binder_free_lru_endbinder:binder_alloc_page_startbinder:binder_alloc_page_endbinder:binder_unmap_user_startbinder:binder_unmap_user_endbinder:binder_unmap_kernel_startbinder:binder_unmap_kernel_endbinder:binder_commandbinder:binder_return# cat /sys/kernel/debug/tracing/trace# tracer: nop                                                                                                                                                                           ## entries-in-buffer/entries-written: 22004/22004   #P:8##                              _-----=> irqs-off#                             / _----=> need-resched#                            | / _---=> hardirq/softirq#                            || / _--=> preempt-depth#                            ||| /     delay#           TASK-PID   CPU#  ||||    TIMESTAMP  FUNCTION#              | |       |   ||||       |         | ndroid.systemui-2043  [001] ....  4311.582476: binder_ioctl: cmd=0xc0306201 arg=0x7ff5dca058 ndroid.systemui-2043  [001] ....  4311.582505: binder_command: cmd=0x40406300 BC_TRANSACTION ndroid.systemui-2043  [001] ....  4311.582560: binder_transaction: transaction=388872 dest_node=11251 dest_proc=792 dest_thread=0 reply=0 flags=0x11 code=0x3 ndroid.systemui-2043  [001] ....  4311.582571: binder_update_page_range: proc=792 allocate=1 offset=0 size=4096 ndroid.systemui-2043  [001] ....  4311.582578: binder_alloc_lru_start: proc=792 page_index=0 ndroid.systemui-2043  [001] ....  4311.582583: binder_alloc_lru_end: proc=792 page_index=0 ndroid.systemui-2043  [001] ....  4311.582600: binder_transaction_alloc_buf: transaction=388872 data_size=80 offsets_size=0 ndroid.systemui-2043  [001] ....  4311.582718: binder_write_done: ret=0 ndroid.systemui-2043  [001] ....  4311.582727: binder_wait_for_work: proc_work=0 transaction_stack=0 thread_todo=1 ndroid.systemui-2043  [001] ....  4311.582739: binder_return: cmd=0x7206 BR_TRANSACTION_COMPLETE ndroid.systemui-2043  [001] ....  4311.582755: binder_read_done: ret=0 ndroid.systemui-2043  [001] ....  4311.582762: binder_ioctl_done: ret=0    Binder:792_3-1237  [001] ....  4311.582971: binder_transaction_received: transaction=388872    Binder:792_3-1237  [001] ....  4311.582974: binder_return: cmd=0x80407202 BR_TRANSACTION    Binder:792_3-1237  [001] ....  4311.582991: binder_read_done: ret=0    Binder:792_3-1237  [001] ....  4311.582996: binder_ioctl_done: ret=0    Binder:792_3-1237  [001] ....  4311.583145: binder_ioctl: cmd=0xc0306201 arg=0x7e36fd4328    Binder:792_3-1237  [001] ....  4311.583150: binder_command: cmd=0x40086303 BC_FREE_BUFFER    Binder:792_3-1237  [001] ....  4311.583159: binder_transaction_buffer_release: transaction=388872 data_size=80 offsets_size=0    Binder:792_3-1237  [001] ....  4311.583169: binder_update_page_range: proc=792 allocate=0 offset=0 size=4096    Binder:792_3-1237  [001] ....  4311.583173: binder_free_lru_start: proc=792 page_index=0    Binder:792_3-1237  [001] ....  4311.583177: binder_free_lru_end: proc=792 page_index=0    Binder:792_3-1237  [001] ....  4311.583188: binder_write_done: ret=0    Binder:792_3-1237  [001] ....  4311.583191: binder_wait_for_work: proc_work=1 transaction_stack=0 thread_todo=0 ndroid.systemui-2043  [000] ....  4311.598003: binder_ioctl: cmd=0xc0306201 arg=0x7ff5dca058 ndroid.systemui-2043  [000] ....  4311.598016: binder_command: cmd=0x40406300 BC_TRANSACTION ndroid.systemui-2043  [000] ....  4311.598051: binder_transaction: transaction=388873 dest_node=11251 dest_proc=792 dest_thread=0 reply=0 flags=0x11 code=0x3 ndroid.systemui-2043  [000] ....  4311.598055: binder_update_page_range: proc=792 allocate=1 offset=0 size=4096 ndroid.systemui-2043  [000] ....  4311.598058: binder_alloc_lru_start: proc=792 page_index=0 ndroid.systemui-2043  [000] ....  4311.598060: binder_alloc_lru_end: proc=792 page_index=0 ndroid.systemui-2043  [000] ....  4311.598074: binder_transaction_alloc_buf: transaction=388873 data_size=80 offsets_size=0 ndroid.systemui-2043  [000] ....  4311.598118: binder_write_done: ret=0 ndroid.systemui-2043  [000] ....  4311.598122: binder_wait_for_work: proc_work=0 transaction_stack=0 thread_todo=1 ndroid.systemui-2043  [000] ....  4311.598127: binder_return: cmd=0x7206 BR_TRANSACTION_COMPLETE ndroid.systemui-2043  [000] ....  4311.598138: binder_read_done: ret=0 ndroid.systemui-2043  [000] ....  4311.598141: binder_ioctl_done: ret=0

更多相关文章

随机推荐