On 2017/1/4 17:29, Chao Yu wrote:

On 2016/12/31 2:51, Jaegeuk Kim wrote:

quoted

This patch relaxes async discard commands to avoid waiting its end_io during
checkpoint.
Instead of waiting them during checkpoint, it will be done when actually reusing
them.

Test on initial partition of nvme drive.

 # time fstrim /mnt/test

Before : 6.158s
After : 4.822s

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Reviewed-by: Chao Yu <redacted>

One comment below,

I still have a comment on this patch.

quoted

-void f2fs_wait_all_discard_bio(struct f2fs_sb_info *sbi)
+/* This should be covered by global mutex, &sit_i->sentry_lock */
+void f2fs_wait_discard_bio(struct f2fs_sb_info *sbi, unsigned int segno)
 {
 	struct list_head *wait_list = &(SM_I(sbi)->wait_list);
 	struct bio_entry *be, *tmp;

@@ -646,7 +650,15 @@ void f2fs_wait_all_discard_bio(struct f2fs_sb_info *sbi)
 		struct bio *bio = be->bio;
 		int err;
 
-		wait_for_completion_io(&be->event);
+		if (!completion_done(&be->event)) {
+			if ((be->start_segno >= segno &&
+					be->end_segno <= segno) ||

segno >= be->start_segno && segno < be->end_segno ?

Can you check this?

Thanks,