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From: Linda Walsh <xfs@tlinx.org>
To: xfs-oss <xfs@oss.sgi.com>
Subject: Re: better perf and memory uage for xfs_fsr? Trivial patch against	xfstools-3.16 included...
Date: Thu, 08 Nov 2012 12:30:11 -0800	[thread overview]
Message-ID: <509C1653.7050906@tlinx.org> (raw)
In-Reply-To: <509BAABF.3030608@tlinx.org>

FWIW, the benefit, probably comes from the read-file, as the written file
is written with DIRECT I/O and I can't see that it should make a difference
there.

Another thing I noted -- when xfs_fsr _exits_, ALL of the space it had used
for file cache read into memory -- gets freed - whereas before, it just stayed in
the buffer cache and didn't get released until the space was needed.

Linda Walsh wrote:
> I wondered why it lumped all this memory reclaiming and thought to try 
> using
> the posix_fadvise calls in xfs_fsr to tell the kernel what data was 
> unneeded
> and such...

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  reply	other threads:[~2012-11-08 20:28 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-11-08 12:51 better perf and memory uage for xfs_fsr? Trivial patch against xfstools-3.16 included Linda Walsh
2012-11-08 20:30 ` Linda Walsh [this message]
2012-11-08 21:39   ` Dave Chinner
2012-11-09  7:10     ` Linda Walsh
2012-11-09  8:16       ` Dave Chinner
2012-11-08 21:29 ` Dave Chinner

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