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f2fs: hurry up to issue discard after io interruption 

Once we encounter I/O interruption during issuing discards, we will delay
long time before next round, but if system status is I/O idle during the
time, it may loses opportunity to issue discards. So this patch changes
to hurry up to issue discard after io interruption.

Besides, this patch also fixes to issue discards accurately with assigned
rate.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2017-09-12 21:35:12 +08:00 committed by Jaegeuk Kim
parent 80647e5f4c
commit e6c6de18f0
1 changed files with 16 additions and 3 deletions
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19
fs/f2fs/segment.c
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@ -1062,6 +1062,7 @@ static int __issue_discard_cmd(struct f2fs_sb_info *sbi, bool issue_cond)
struct blk_plug plug;
int iter = 0, issued = 0;
int i;
bool io_interrupted = false;
mutex_lock(&dcc->cmd_lock);
f2fs_bug_on(sbi,
@ -1083,11 +1084,20 @@ static int __issue_discard_cmd(struct f2fs_sb_info *sbi, bool issue_cond)
continue;
}
if (!issue_cond || is_idle(sbi)) {
issued++;
if (!issue_cond) {
__submit_discard_cmd(sbi, dc);
issued++;
continue;
}
if (issue_cond && iter++ > DISCARD_ISSUE_RATE)
if (is_idle(sbi)) {
__submit_discard_cmd(sbi, dc);
issued++;
} else {
io_interrupted = true;
}
if (++iter >= DISCARD_ISSUE_RATE)
goto out;
}
if (list_empty(pend_list) && dcc->pend_list_tag[i] & P_TRIM)
@ -1097,6 +1107,9 @@ out:
blk_finish_plug(&plug);
mutex_unlock(&dcc->cmd_lock);
if (!issued && io_interrupted)
issued = -1;
return issued;
}