Use systrace to capture DDR frequency, GPU frequency, free memory, FPSGO and sched and other information

Description Usually Systrace captures CPU frequency information by default, but there is no DDR/GPU frequency/sched information, and sometimes you need to check DDR/GPU frequency/FPSGO/sched and other information

Solution

1. DDR frequency

参考代码kernel-4.14/include/trace/events/mtk_events.h
       TRACE_EVENT(perf_index_s,
               TP_PROTO(
                              unsigned int sf0,
                              unsigned int sf1,
                              unsigned int sf2,
                              int dram_freq,
                              int bw_c,
                              int bw_g,
                              int bw_mm,
                              int bw_total,
                              int vcore_uv
               ),

Systrace prints like this:
swapper/2-0 (-----) [002] d.h1 1156.964742: perf_index_s: sched_freq=2000000|2000000|0 dram_freq=800 bw=-2135138048|-2135138048|-2135138 048|- 2135138048 vcore=550000

   dram_freq=800 bw=-2135138048|-2135138048|-2135138048|-2135138048 vcore=550000
  
   DDR频率 800MHz、CPU Bandwidth、GPU Bandwidth、modem Bandwidth、total Bandwidth、vcore电压。 Bandwidth数据可能不准，部分平台没有实现。

Systrace event that needs to be opened

adb shell "echo 1 > /sys/devices/system/cpu/perf/enable"

       kernel-V4.1*版本：  adb shell "echo 1 > /sys/kernel/tracing/events/mtk_events/perf_index_s/enable"

       kernel-V5.10版本：  adb shell "echo 1 > /sys/kernel/tracing/events/perf_tracker/perf_index_s/enable"

2 If you want to record the amount of memory currently available in Systrace, you can open it:

 adb shell "echo 1 > /sys/devices/system/cpu/perf/enable"
       kernel-V4.1*版本：  adb shell "echo 1 > /sys/kernel/tracing/events/mtk_events/perf_index_l/enable"
       kernel-V5.10版本：  adb shell "echo 1 > /sys/kernel/tracing/events/perf_tracker/perf_index_l/enable"
       比如systrace log:
       <idle>-0     (-----) [002] d.h1  2173.342581: perf_index_l: free_mem=853360 avail_mem=5227104 iostats=0|0|0|0|0|0|0|0|0|7992616|0 stall=3|0|0|0|0|0|0|0

3 If you want to record FPSGO information in Systrace, please open:

 adb shell "echo 63 > /sys/kernel/fpsgo/common/systrace_mask"        // this for fpsgo

        adb shell “echo 1 > /sys/kernel/fpsgo/xgf/xgf_trace_enable”
        adb shell “echo 1 > /sys/kernel/fpsgo/xgf/xgf_log_trace_enable”

4 If you want to record the GPU frequency in Systrace, you can open:

  adb shell "echo 1 > /sys/module/ged/parameters/ged_log_perf_trace_enable"   // these for GPU
        adb shell "echo 1 > /sys/devices/system/cpu/perf/enable"
        adb shell "echo 1 > /sys/module/ged/parameters/ged_log_trace_enable"

        adb shell "echo 1 > /sys/kernel/tracing/events/mtk_events/perf_index_gpu/enable"
        adb shell "echo 1 > /sys/kernel/tracing/events/perf_tracker/perf_index_gpu/enable"

       mtkPowerMsgHdl-762 ( 700) [005] ...1 37118.430645: tracing_mark_write: C|5566|gpu_freq|431|0|0
       mtkPowerMsgHdl-762 ( 700) [005] ...1 37118.430645: tracing_mark_write: C|5566|gpu_freq_max|886|0|0

5 The above trce needs root authority, and some information may not be displayed on the chrome browser when capturing such Systrace, you need to open and search related logs to view through text files.

6 The CPU frequency is usually available and can be displayed directly on the chrome browser

   ipi_cpu_dvfs_rt-391 ( 391) [007] .... 37118.682285: cpu_frequency: state=1624000 cpu_id=6
       ipi_cpu_dvfs_rt-391 ( 391) [007] .... 37118.682286: cpu_frequency_limits: min=1820000 max=3000000 cpu_id=7
       <idle>-0 (-----) [007] d..1 37120.151326: cpu_idle: state=0 cpu_id=7

  如果没有CPU频率，请检查这些trace event有没有打开：

/sys/kernel/tracing/events/power/cpu_frequency_limits/
cpu_frequency_limits
cpu_frequency
cpu_idle

7 systrace captures sched information, you need to open the following trace event:

       kernel-5.10 频率和摆核信息都抓取：
               sched_migrate_task sugov_ext_util sched_task_uclamp sched_select_task_rq sched_queue_task sched_frequency_limits sched_find_energy_efficient_cpu sched_big_task_rotation sched_force_migrate sched_waking irq
        只抓摆核的：
               sched_select_task_rq sched_select_task_rq_rt sched_force_migrate sched_migrate_task sched_queue_task
        只抓调频的：
               sugov_ext_util sched_frequency_limits freq_qos_user_setting sched_queue_task
 
  比如在您的脚本里这样设置：
        adb shell "echo 1 > /sys/kernel/tracing/events/sched/sched_blocked_reason/enable"
        adb shell "echo 1 > /sys/kernel/tracing/events/sched/sched_migrate_task/enable"
        adb shell "echo 1 > /sys/kernel/tracing/events/scheduler/sched_task_uclamp/enable"
        adb shell "echo 1 > /sys/kernel/tracing/events/scheduler/sugov_ext_util/enable"
        adb shell "echo 1 > /sys/kernel/tracing/events/sched/sched_waking/enable"
        adb shell "echo 1 > /sys/kernel/tracing/events/scheduler/sched_select_task_rq/enable"
        adb shell "echo 1 > /sys/kernel/tracing/events/scheduler/sched_find_energy_efficient_cpu/enable"
        adb shell "echo 1 > /sys/kernel/tracing/events/scheduler/sched_big_task_rotation/enable"
        adb shell "echo 1 > /sys/kernel/tracing/events/scheduler/sched_force_migrate/enable"
 
       kernel-4.14 需要打开的 sched event:
              sched_switch sched_wakeup sched_find_best_target sched_select_task_rq schedutil_uclamp_util sched_boost_cpu sched_boost_task cpu_frequency_limits cpu_frequency sched_hmp_migrate sched_util
 
       IRQ 需要打开的 event:
/sys/kernel/tracing/events/scheduler/irq
irq_handler_entry
irq_handler_exit
 
       work queue 需要打开的 event:
/sys/kernel/tracing/events/workqueue/
workqueue_execute_start
workqueue_execute_end
workqueue_queue_work
workqueue_activate_work