linux-kernel - Re: [f2fs-dev] [PATCH 08/10] f2fs: relax async discard commands more

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Date:   Thu, 5 Jan 2017 11:59:48 -0800
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <yuchao0@...wei.com>
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH 08/10] f2fs: relax async discard commands more

Hi Chao,

On 01/05, Chao Yu wrote:
> Hi Jaegeuk,
> 
> I can see patch named ("f2fs: call f2fs_wait_all_discard_bio for an error case")
> was merged in dev-test, but I think it's no needed to change error case handling
> like this since f2fs_wait_all_discard_bio should always be called after
> clear_prefree_segments.

Indeed, it's right. ;)

Thanks,

> 
> Thanks,
> 
> On 2017/1/5 11:19, Chao Yu wrote:
> > On 2017/1/4 17:29, Chao Yu wrote:
> >> On 2016/12/31 2:51, Jaegeuk Kim wrote:
> >>> 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@...nel.org>
> >>
> >> Reviewed-by: Chao Yu <yuchao0@...wei.com>
> >>
> >> One comment below,
> > 
> > I still have a comment on this patch.
> > 
> >>> -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,
> >