commit f1f62e3b73fa5b84a552332beeacce874fd9429c
author Marc Hittinger <trojal@google.com> Wed May 17 15:57:43 2017 -0700
committer Marc Hittinger <trojal@google.com> Fri May 19 13:07:52 2017 -0700
tree c367e651eacbe04ec6d050957f9c4577fbc0e525
parent 351bb0ce4732ae5cb60494cb556d92599155b534

Enable lowmemory trace events in atrace

Enable collection of lowmemory events in atrace as a category. These
events have been available in the kernel, but not exposed via atrace.

Bug: https://github.com/catapult-project/catapult/issues/3557
Test: Run "atrace memreclaim", trigger LMK events.
Change-Id: I92140518796bdda8b302d566d7d78e2129b9839c

cmds/atrace/atrace.cpp

diff --git a/cmds/atrace/atrace.cpp b/cmds/atrace/atrace.cpp
index 8d9442b..c79692e 100644
--- a/cmds/atrace/atrace.cpp
+++ b/cmds/atrace/atrace.cpp
@@ -172,6 +172,7 @@
         { 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" },
+        { REQ,      "events/lowmemorykiller/enable" },
     } },
     { "regulators",  "Voltage and Current Regulators", 0, {
         { REQ,      "events/regulator/enable" },

cmds/atrace/atrace.rc

diff --git a/cmds/atrace/atrace.rc b/cmds/atrace/atrace.rc
index cef41be..1e0f6f8 100644
--- a/cmds/atrace/atrace.rc
+++ b/cmds/atrace/atrace.rc
@@ -51,6 +51,8 @@
     chown root shell /sys/kernel/tracing/events/binder/binder_locked/enable
     chown root shell /sys/kernel/debug/tracing/events/binder/binder_unlock/enable
     chown root shell /sys/kernel/tracing/events/binder/binder_unlock/enable
+    chown root shell /sys/kernel/debug/tracing/events/lowmemorykiller/enable
+    chown root shell /sys/kernel/tracing/events/lowmemorykiller/enable
 
     chown root shell /sys/kernel/debug/tracing/tracing_on
     chown root shell /sys/kernel/tracing/tracing_on
@@ -119,6 +121,8 @@
     chmod 0664 /sys/kernel/tracing/events/i2c/smbus_result/enable
     chmod 0664 /sys/kernel/debug/tracing/events/i2c/smbus_reply/enable
     chmod 0664 /sys/kernel/tracing/events/i2c/smbus_reply/enable
+    chmod 0664 /sys/kernel/debug/tracing/events/lowmemorykiller/enable
+    chmod 0664 /sys/kernel/tracing/events/lowmemorykiller/enable
 
     # Tracing disabled by default
     write /sys/kernel/debug/tracing/tracing_on 0