From: Florian Weimer <fw@deneb.enyo.de>
To: Brian Foster <bfoster@redhat.com>
Cc: xfs@oss.sgi.com
Subject: Re: [FAQ] XFS speculative preallocation
Date: Fri, 21 Mar 2014 21:11:29 +0100 [thread overview]
Message-ID: <87eh1vuxam.fsf@mid.deneb.enyo.de> (raw)
In-Reply-To: <20140321162920.GA3087@laptop.bfoster> (Brian Foster's message of "Fri, 21 Mar 2014 12:29:20 -0400")
* Brian Foster:
> Although speculative preallocation can lead to reports of excess space
> usage, the preallocated space is not permanent unless explicitly made so
> via fallocate or a similar interface.
How does an explicit allocation with posix_fallocate interact with
speculative preallocation? Does it disable it?
I see rather dramatic fragmentation of the systemd journal when it is
stored on XFS, and it calls posix_fallocate before writing data to the
file.
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next prev parent reply other threads:[~2014-03-21 20:11 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-21 16:29 [FAQ] XFS speculative preallocation Brian Foster
2014-03-21 16:54 ` Shaun Gosse
2014-03-21 17:09 ` Arkadiusz Miśkiewicz
2014-03-21 18:02 ` Brian Foster
2014-03-21 23:16 ` Dave Chinner
2014-03-21 20:11 ` Florian Weimer [this message]
2014-03-21 23:10 ` Dave Chinner
2014-03-21 23:13 ` Eric Sandeen
2014-03-21 23:18 ` Dave Chinner
2014-03-22 13:32 ` Christoph Hellwig
2014-03-21 23:05 ` Dave Chinner
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