linux-kernel - Re: [PATCH 3.15 2/2] f2fs: check bdi->dirty_exceeded when trying to skip data writes

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Date:	Tue, 15 Jul 2014 10:57:54 -0700
From:	Jaegeuk Kim <jaegeuk@...nel.org>
To:	Greg KH <greg@...ah.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net, stable@...r.kernel.org
Subject: Re: [PATCH 3.15 2/2] f2fs: check bdi->dirty_exceeded when trying to
 skip data writes

On Mon, Jul 14, 2014 at 05:53:36PM -0700, Greg KH wrote:
> On Mon, Jul 14, 2014 at 07:52:51AM -0700, Jaegeuk Kim wrote:
> > commit dd6b9bf5883c3ca9c17bac80ccd8615fe5a452a3 upstream.
> 
> You mean 2743f865543c0c4a5e12fc13edb2bf89a6e9687c, right?

Ah, correct.
Thank you. :)

> 
> thanks,
> 
> greg k-h
> 
> > 
> > If we don't check the current backing device status, balance_dirty_pages can
> > fall into infinite pausing routine.
> > 
> > This can be occurred when a lot of directories make a small number of dirty
> > dentry pages including files.
> > 
> > Reported-by: Brian Chadwick <brianchad@...tnet.com.au>
> > Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> > ---
> >  fs/f2fs/node.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
> > index a9c0495..5696bde 100644
> > --- a/fs/f2fs/node.c
> > +++ b/fs/f2fs/node.c
> > @@ -42,6 +42,8 @@ bool available_free_memory(struct f2fs_sb_info *sbi, int type)
> >  		mem_size = (nm_i->nat_cnt * sizeof(struct nat_entry)) >> 12;
> >  		res = mem_size < ((val.totalram * nm_i->ram_thresh / 100) >> 2);
> >  	} else if (type == DIRTY_DENTS) {
> > +		if (sbi->sb->s_bdi->dirty_exceeded)
> > +			return false;
> >  		mem_size = get_pages(sbi, F2FS_DIRTY_DENTS);
> >  		res = mem_size < ((val.totalram * nm_i->ram_thresh / 100) >> 1);
> >  	}
> > -- 
> > 2.0.1.472.g6f92e5f
> > 
> > --
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-- 
Jaegeuk Kim
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