rootdir: init.rc to limit discard size to 128MB
In any case, UFS storage suffers from long discard latency.
Change-Id: Iaa8ef6eb862934af43254bd10873a12c3d34e926
Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>
diff --git a/rootdir/init.rc b/rootdir/init.rc
index 7a13e12..4968927 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -771,6 +771,11 @@
write /sys/fs/f2fs/${dev.mnt.blk.data}/cp_interval 200
write /sys/fs/f2fs/${dev.mnt.blk.data}/gc_urgent_sleep_time 50
+ # limit discard size to 128MB in order to avoid long IO latency
+ # for filesystem tuning first (dm or sda)
+ # Note that, if dm-<num> is used, sda/mmcblk0 should be tuned in vendor/init.rc
+ write /sys/devices/virtual/block/${dev.mnt.blk.data}/queue/discard_max_bytes 134217728
+
# Permissions for System Server and daemons.
chown system system /sys/power/autosleep