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Commit 61eff6b7 authored by Kalesh Singh's avatar Kalesh Singh
Browse files

atrace: Setup throttled rss_stat event 

Create a synthetic rss_stat_throttled event that is triggered from the
rss_stat event every time the rss size crosses a 512KB boundary.

Bug: 145972256
Test: ls /sys/kernel/tracing/events/synthetic
      cat /sys/kernel/tracing/events/kmem/rss_stat/trigger
Change-Id: I653397f756c60fa274f1e0198974d868945b8d99
parent 35de4cf0

cmds/atrace/atrace.rc

+15 −0
Original line number Diff line number Diff line
@@ -266,6 +266,21 @@ on late-init 
    chmod 0666 /sys/kernel/debug/tracing/per_cpu/cpu15/trace

    chmod 0666 /sys/kernel/tracing/per_cpu/cpu15/trace



# Setup synthetic events

    chmod 0666 /sys/kernel/tracing/synthetic_events

    chmod 0666 /sys/kernel/debug/tracing/synthetic_events



    # rss_stat_throttled

    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

    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)"



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

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

# will likely fail with EBUSY as it would be in use by traced_probes.