commit 2accf5bd7916ee943e97defce2a0113da43e6b80
author Daeho Jeong <daehojeong@google.com> Tue Nov 29 21:04:12 2022 +0000
committer Daeho Jeong <daehojeong@google.com> Thu Dec 01 22:27:09 2022 +0000
tree 07271cab50f5cbac9ab942b2f0817958350072bb
parent f9e6c5104d4d0be8661006e75ae2f5b8d227df12

set iostat_period_ms to 1 sec

Current period of this is 3 sec and it is used when Perfetto profiling is running on Android. Without Perfetto profiling, it doesn't affect the system at all. However, 3 sec doesn't provide enough granularity to understand F2FS I/O behaviors. To make F2FS I/O profiling ftrace effective, set the ftrace period to 1 sec.

Test: check f2fs iostat_period_ms sysfs node value
Change-Id: I2d418795613dfbd1aea6c4f13c9a39af3deb1c4d
Signed-off-by: Daeho Jeong <daehojeong@google.com>

rootdir/init.rc

diff --git a/rootdir/init.rc b/rootdir/init.rc
index f05c0bf..1131f3f 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -1108,6 +1108,7 @@
     # are not aware of using fsync()/sync() to prepare sudden power-cut.
     write /dev/sys/fs/by-name/userdata/cp_interval 200
     write /dev/sys/fs/by-name/userdata/gc_urgent_sleep_time 50
+    write /dev/sys/fs/by-name/userdata/iostat_period_ms 1000
     write /dev/sys/fs/by-name/userdata/iostat_enable 1
 
     # set readahead multiplier for POSIX_FADV_SEQUENTIAL files