Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit eacbd553 authored by Sahitya Tummala's avatar Sahitya Tummala
Browse files

f2fs: fix unnecessary periodic wakeup of discard thread when dev is busy 



When dev is busy, discard thread wake up timeout can be aligned with the
exact time that it needs to wait for dev to come out of busy. This helps
to avoid unnecessary periodic wakeups and thus save some power.

Change-Id: Ic0d113e377062146899cf14cac9c8e7a145f8484
Signed-off-by: default avatarSahitya Tummala <stummala@codeaurora.org>
parent ca049648

fs/f2fs/segment.c

+7 −1
Original line number Diff line number Diff line
@@ -1397,6 +1397,8 @@ static int issue_discard_thread(void *data) 
	struct discard_policy dpolicy;

	unsigned int wait_ms = DEF_MIN_DISCARD_ISSUE_TIME;

	int issued;

	unsigned long interval = sbi->interval_time[REQ_TIME] * HZ;

	long delta;



	set_freezable();
@@ -1433,6 +1435,10 @@ static int issue_discard_thread(void *data) 
			__wait_all_discard_cmd(sbi, &dpolicy);

			wait_ms = dpolicy.min_interval;

		} else if (issued == -1){

			delta = (sbi->last_time[REQ_TIME] + interval) - jiffies;

			if (delta > 0)

				wait_ms = jiffies_to_msecs(delta);

			else

				wait_ms = dpolicy.mid_interval;

		} else {

			wait_ms = dpolicy.max_interval;