From: Jim Meyering <jim@meyering.net>
To: Dave Chinner <david@fromorbit.com>
Cc: Hugh Dickins <hughd@google.com>,
Jaegeuk Hanse <jaegeuk.hanse@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Theodore Ts'o <tytso@mit.edu>, Zheng Liu <wenqing.lz@taobao.com>,
Jeff liu <jeff.liu@oracle.com>, Paul Eggert <eggert@cs.ucla.edu>,
Christoph Hellwig <hch@infradead.org>,
Josef Bacik <josef@redhat.com>, Andi Kleen <andi@firstfloor.org>,
Andreas Dilger <adilger@dilger.ca>,
Marco Stornelli <marco.stornelli@gmail.com>,
Chris Mason <chris.mason@fusionio.com>,
Sunil Mushran <sunil.mushran@oracle.com>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [PATCH] tmpfs: support SEEK_DATA and SEEK_HOLE (reprise)
Date: Thu, 29 Nov 2012 21:17:51 +0100 [thread overview]
Message-ID: <87ip8o17v4.fsf@rho.meyering.net> (raw)
In-Reply-To: <20121129195206.GB6434@dastard> (Dave Chinner's message of "Fri, 30 Nov 2012 06:52:07 +1100")
Dave Chinner wrote:
...
>> So, yes, GNU cp will soon use this feature.
>
> It would be nice if utilities like grep used it, too, because having
> grep burn gigabytes of memory scanning holes in large files and
> then going OOM is, well, kind of nasty:
>
> $ xfs_io -f -c "truncate 1t" blah
> $ ls -l
> total 0
> -rw-r--r-- 1 dave dave 1.0T Nov 30 06:42 blah
> $ grep foo blah
> grep: memory exhausted
> $ $ grep -V
> grep (GNU grep) 2.12
Hi Dave,
Yes, adapting grep is also on the road map.
That precise case was one of my arguments for making SEEK_DATA/SEEK_HOLE
support more widespread.
--
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next prev parent reply other threads:[~2012-11-29 20:17 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-29 1:22 Hugh Dickins
2012-11-29 1:29 ` Jaegeuk Hanse
2012-11-29 2:02 ` Hugh Dickins
2012-11-29 4:15 ` Jim Meyering
2012-11-29 4:42 ` Jeff Liu
2012-11-29 6:53 ` Jim Meyering
2012-11-29 7:27 ` Jeff Liu
2012-11-29 19:52 ` Dave Chinner
2012-11-29 20:17 ` Jim Meyering [this message]
2012-11-29 2:44 ` Dave Chinner
2012-11-29 4:22 ` Hugh Dickins
2012-11-29 22:59 ` Andrew Morton
2012-11-29 23:29 ` Hugh Dickins
2012-11-30 0:18 ` Andrew Morton
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