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Commit d5b5f5ac authored by Kalesh Singh's avatar Kalesh Singh
Browse files

atrace: Remove persisitent rss_stat_throttled trigger 

It was found that the persistent rss_stat_throttled event trigger
causes a 8% incease in kswapd CPU usage. So remove this persistent
trigger, instead perfetto will dynamically create the trigger when
needed.

Test: adb push test/configs/rss_stat.cfg /data/local/tmp/
        && cf-adb shell 'cat /data/local/tmp/rss_stat.cfg |
        perfetto --txt -c - -o /data/misc/perfetto-traces/trace
Bug: 236172293
Change-Id: I70a978de1fbf2ed538bb869edc715e61aee7efa4
Merged-In: I70a978de1fbf2ed538bb869edc715e61aee7efa4
parent 33da9468

cmds/atrace/atrace.rc

+2 −5
Original line number Diff line number Diff line
@@ -294,12 +294,9 @@ on late-init 
    write /sys/kernel/tracing/synthetic_events "rss_stat_throttled unsigned int mm_id; unsigned int curr; int member; long size"

    write /sys/kernel/debug/tracing/synthetic_events "rss_stat_throttled unsigned int mm_id; unsigned int curr; int member; long size"



# Set up histogram triggers

    # rss_stat_throttled (bucket size == 512KB)

    chmod 0666 /sys/kernel/tracing/events/kmem/rss_stat/trigger

    # allow creating event triggers

    chmod 0666 /sys/kernel/debug/tracing/events/kmem/rss_stat/trigger

    write /sys/kernel/tracing/events/kmem/rss_stat/trigger "hist:keys=mm_id,member:bucket=size/0x80000:onchange($$bucket).rss_stat_throttled(mm_id,curr,member,size)"

    write /sys/kernel/debug/tracing/events/kmem/rss_stat/trigger "hist:keys=mm_id,member:bucket=size/0x80000:onchange($$bucket).rss_stat_throttled(mm_id,curr,member,size)"

    chmod 0666 /sys/kernel/tracing/events/kmem/rss_stat/trigger



# Only create the tracing instance if persist.mm_events.enabled

# Attempting to remove the tracing instance after it has been created