commit ae780bce59f38ce08995dfb025b2da547b8ef948
author Mohan Srinivasan <srmohan@google.com> Wed Oct 18 15:07:40 2017 -0700
committer Mohan Srinivasan <srmohan@google.com> Fri Oct 27 16:27:13 2017 -0700
tree 1c84bfda9e419906d87d34aeef331358f2710e58
parent 88e5ec1a7f309aa08e44ba97f039008a463c9ed0

Switch to deadline IO scheduler post boot.

The deadline IO scheduler results in lower latency SD, and pulls in
latency outliers (especially when the flash starts getting fragmented).
Switch to deadline post boot.

Test: various workloads, both synthetic (fio) as well as actual
workloads (app launch, ioshark).

Bug: 63630139
Change-Id: I94b90ac09e921fdf01564bd4c6e1a1b809f3f8ec
Signed-off-by: Mohan Srinivasan <srmohan@google.com>

init-common.rc

diff --git a/init-common.rc b/init-common.rc
index ca1f526..5ce4f69 100644
--- a/init-common.rc
+++ b/init-common.rc
@@ -15,6 +15,8 @@
     write /sys/block/sda/queue/iostats 1
     write /sys/block/dm-0/queue/read_ahead_kb 512
     write /sys/block/dm-1/queue/read_ahead_kb 512
+    write /sys/block/sda/queue/scheduler deadline
+    write /sys/block/sde/queue/scheduler deadline
 
 on property:sys.boot_completed=1 && property:ro.build.type=user
     write /proc/sys/kernel/modules_disabled 1