linux-kernel - Re: [PATCH 2/3] f2fs: shrink blk plug region

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Message-ID: <20170412195716.GA12163@jaegeuk.local>
Date:   Wed, 12 Apr 2017 12:57:16 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <yuchao0@...wei.com>
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, chao@...nel.org
Subject: Re: [PATCH 2/3] f2fs: shrink blk plug region

On 04/12, Chao Yu wrote:
> Hi Jaegeuk,
> 
> Just reminding, miss merging this patch? :)

Yup, merged. ;)

> 
> Thanks,
> 
> On 2017/3/27 18:14, Chao Yu wrote:
> > Don't use blk plug covering area where there won't be any IOs being issued.
> > 
> > Signed-off-by: Chao Yu <yuchao0@...wei.com>
> > ---
> >  fs/f2fs/segment.c | 6 ++----
> >  1 file changed, 2 insertions(+), 4 deletions(-)
> > 
> > diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> > index c1a03b0857f9..57a81f9c8c14 100644
> > --- a/fs/f2fs/segment.c
> > +++ b/fs/f2fs/segment.c
> > @@ -848,9 +848,8 @@ static int issue_discard_thread(void *data)
> >  	if (kthread_should_stop())
> >  		return 0;
> >  
> > -	blk_start_plug(&plug);
> > -
> >  	mutex_lock(&dcc->cmd_lock);
> > +	blk_start_plug(&plug);
> >  	list_for_each_entry_safe(dc, tmp, pend_list, list) {
> >  		f2fs_bug_on(sbi, dc->state != D_PREP);
> >  
> > @@ -860,6 +859,7 @@ static int issue_discard_thread(void *data)
> >  		if (iter++ > DISCARD_ISSUE_RATE)
> >  			break;
> >  	}
> > +	blk_finish_plug(&plug);
> >  
> >  	list_for_each_entry_safe(dc, tmp, wait_list, list) {
> >  		if (dc->state == D_DONE)
> > @@ -867,8 +867,6 @@ static int issue_discard_thread(void *data)
> >  	}
> >  	mutex_unlock(&dcc->cmd_lock);
> >  
> > -	blk_finish_plug(&plug);
> > -
> >  	iter = 0;
> >  	congestion_wait(BLK_RW_SYNC, HZ/50);
> >  
> >