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f2fs: wake up discard_thread iff there is a candidate

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This patch fixes to avoid needless wake ups.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim
2017-08-22 21:15:43 -07:00
parent adb6dc1971
commit 01983c715a
3 changed files with 27 additions and 7 deletions
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25
fs/f2fs/segment.h
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@@ -798,3 +798,28 @@ static inline long nr_pages_to_write(struct f2fs_sb_info *sbi, int type,
wbc->nr_to_write = desired;
return desired - nr_to_write;
}
static inline void wake_up_discard_thread(struct f2fs_sb_info *sbi, bool force)
{
struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
bool wakeup = false;
int i;
if (force)
goto wake_up;
mutex_lock(&dcc->cmd_lock);
for (i = MAX_PLIST_NUM - 1;
i >= 0 && plist_issue(dcc->pend_list_tag[i]); i--) {
if (!list_empty(&dcc->pend_list[i])) {
wakeup = true;
break;
}
}
mutex_unlock(&dcc->cmd_lock);
if (!wakeup)
return;
wake_up:
dcc->discard_wake = 1;
wake_up_interruptible_all(&dcc->discard_wait_queue);
}