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

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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.

Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Sahitya Tummala 2018-08-31 15:09:26 +05:30 committed by Jaegeuk Kim
parent 7d20c8abb2
commit abde73c718
1 changed files with 7 additions and 1 deletions
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8
fs/f2fs/segment.c
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@ -1564,6 +1564,8 @@ 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();
@ -1600,7 +1602,11 @@ static int issue_discard_thread(void *data)
__wait_all_discard_cmd(sbi, &dpolicy);
wait_ms = dpolicy.min_interval;
} else if (issued == -1){
wait_ms = dpolicy.mid_interval;
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;
}