commit 431e35ef7c55fd18f8c0126014c75a6fe4efd3b5
author Daeho Jeong <daehojeong@google.com> Fri Apr 29 11:49:07 2022 -0700
committer Daeho Jeong <daehojeong@google.com> Fri Apr 29 11:52:03 2022 -0700
tree 11d07ce3aa8aac995ceed04c356e0926590a0df4
parent a9eee03c56ff24623144872313a5ec646dc38ddc

init.rc: increase readahead window multiplier for POSIX_FADV_SEQUENTIAL files

Set readahead window multiplier for POSIX_FADV_SEQUENTIAL files as 16 to
enhance file read performance like a language package loading.

Bug: 192011293
Test: adb shell cat /dev/sys/fs/by-name/userdata/seq_file_ra_mul
Signed-off-by: Daeho Jeong <daehojeong@google.com>
Change-Id: I7f7e4339651be2d6aa99b07bcb12ab62136a940e

rootdir/init.rc

diff --git a/rootdir/init.rc b/rootdir/init.rc
index aae28dc..56e8f31 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -1099,6 +1099,9 @@
     write /dev/sys/fs/by-name/userdata/gc_urgent_sleep_time 50
     write /dev/sys/fs/by-name/userdata/iostat_enable 1
 
+    # set readahead multiplier for POSIX_FADV_SEQUENTIAL files
+    write /dev/sys/fs/by-name/userdata/seq_file_ra_mul 16
+
     # limit discard size to 128MB in order to avoid long IO latency
     # for filesystem tuning first (dm or sda)
     # this requires enabling selinux entry for sda/mmcblk0 in vendor side