init.rc: tune F2FS to be aligned to system settings
Android sets /proc/sys/vm/dirty_expire_centisecs to 200, so f2fs
doesn't need to do checkpoint in 60 seconds.
Bug: 127511432
Change-Id: I2ba0623053d4480b82003eb1cca85ff03c61fc0f
Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>
diff --git a/rootdir/init.rc b/rootdir/init.rc
index f2e7a7c..478f744 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -648,6 +648,12 @@
write /proc/sys/vm/dirty_expire_centisecs 200
write /proc/sys/vm/dirty_background_ratio 5
+ # F2FS tuning. Set cp_interval larger than dirty_expire_centisecs
+ # to avoid power consumption when system becomes mostly idle. Be careful
+ # to make it too large, since it may bring userdata loss, if they
+ # are not aware of using fsync()/sync() to prepare sudden power-cut.
+ write /sys/fs/f2fs/${dev.mnt.blk.data}/cp_interval 200
+
# Permissions for System Server and daemons.
chown radio system /sys/android_power/state
chown radio system /sys/android_power/request_state