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

diff --git a/cmds/atrace/atrace.cpp b/cmds/atrace/atrace.cpp
index 8d9442b..c79692e 100644 (file)
--- a/cmds/atrace/atrace.cpp
+++ b/cmds/atrace/atrace.cpp
@@ -172,6 +172,7 @@ static const TracingCategory k_categories[] = {
         { 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" },

diff --git a/cmds/atrace/atrace.rc b/cmds/atrace/atrace.rc
index cef41be..1e0f6f8 100644 (file)
--- a/cmds/atrace/atrace.rc
+++ b/cmds/atrace/atrace.rc
@@ -51,6 +51,8 @@ on post-fs
     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 @@ on post-fs
     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