From: Jan Kara <jack@suse.cz>
To: Phillip Susi <psusi@ubuntu.com>
Cc: Howard Chu <hyc@symas.com>,
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: Mon, 11 Mar 2013 12:52:20 +0100 [thread overview]
Message-ID: <20130311115220.GB29799@quack.suse.cz> (raw)
In-Reply-To: <513A8ECB.8000504@ubuntu.com>
On Fri 08-03-13 20:22:19, Phillip Susi wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> 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.
Why do you think so? AFAICS it is implemented by setting VM_RAND_READ
flag in the VMA and do_async_mmap_readahead() and do_sync_mmap_readahead()
check for the flag and don't do anything if it is set...
Honza
--
Jan Kara <jack@suse.cz>
SUSE Labs, CR
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next prev parent reply other threads:[~2013-03-11 11:52 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
2013-03-11 11:52 ` Jan Kara [this message]
2013-03-11 15:03 ` Phillip Susi
2013-03-09 2:34 ` Ric Mason
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