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Re: [PATCH 1/1] xfs: log the inode in ->write_inode calls for kupdate

To: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Subject: Re: [PATCH 1/1] xfs: log the inode in ->write_inode calls for kupdate
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Wed, 21 Dec 2011 08:19:07 +1100
Cc: xfs@xxxxxxxxxxx, Paul Anderson <pha@xxxxxxxxx>, Sean Thomas Caron <scaron@xxxxxxxxx>
In-reply-to: <20111218154955.GB17626@xxxxxxxxxxxxx>
References: <20111218154936.GA17626@xxxxxxxxxxxxx> <20111218154955.GB17626@xxxxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Sun, Dec 18, 2011 at 10:49:55AM -0500, Christoph Hellwig wrote:
> If the writeback code writes back an inode because it has expired we currently
> use the non-blockin ->write_inode path.  This means any inode that is pinned
> is skipped.  With delayed logging and a workload that has very little log
> traffic otherwise it is very likely that an inode that gets constantly
> written to is always pinned, and thus we keep refusing to write it.  The VM
> writeback code at that point redirties it and doesn't try to write it again
> for another 30 seconds.  This means under certain scenarious time based
> metadata writeback never happens.
> 
> Fix this by calling into xfs_log_inode for kupdate in addition to data
> integrity syncs, and thus transfer the inode to the log ASAP.

Makes sense.

> Signed-off-by: Christoph Hellwig <hch@xxxxxx>

Reviewed-by: Dave Chinner <dchinner@xxxxxxxxxx>

-- 
Dave Chinner
david@xxxxxxxxxxxxx

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