From: Phillip Susi <psusi@ubuntu.com>
To: Howard Chu <hyc@symas.com>
Cc: Chris Friesen <chris.friesen@genband.com>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Johannes Weiner <hannes@cmpxchg.org>, Jan Kara <jack@suse.cz>,
linux-kernel <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org
Subject: Re: mmap vs fs cache
Date: Fri, 08 Mar 2013 20:22:19 -0500 [thread overview]
Message-ID: <513A8ECB.8000504@ubuntu.com> (raw)
In-Reply-To: <5139FD27.1030208@symas.com>
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On 03/08/2013 10:00 AM, Howard Chu wrote:
> Yes, that's what I was thinking. I added a
> posix_madvise(..POSIX_MADV_RANDOM) but that had no effect on the
> test.
Yep, that's because it isn't implemented.
You might try MADV_WILLNEED to schedule it to be read in first. I
believe that will only read in the requested page, without additional
readahead, and then when you fault on the page, it already has IO
scheduled, so the extra readahead will also be skipped.
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next prev parent reply other threads:[~2013-03-09 1:22 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <5136320E.8030109@symas.com>
2013-03-07 15:43 ` mmap vs fs cache Jan Kara
2013-03-08 2:08 ` Johannes Weiner
2013-03-08 7:46 ` Howard Chu
2013-03-08 8:42 ` Kirill A. Shutemov
2013-03-08 9:40 ` Howard Chu
2013-03-08 14:47 ` Chris Friesen
2013-03-08 15:00 ` Howard Chu
2013-03-08 15:25 ` Chris Friesen
2013-03-08 16:16 ` Johannes Weiner
2013-03-08 20:04 ` Howard Chu
2013-03-11 12:04 ` Jan Kara
2013-03-11 12:40 ` Howard Chu
2013-03-09 3:28 ` Ric Mason
2013-03-09 1:22 ` Phillip Susi [this message]
2013-03-11 11:52 ` Jan Kara
2013-03-11 15:03 ` Phillip Susi
2013-03-09 2:34 ` Ric Mason
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