linux-kernel - Re: mmap vs fs cache

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Message-ID: <20130311115220.GB29799@quack.suse.cz>
Date:	Mon, 11 Mar 2013 12:52:20 +0100
From:	Jan Kara <jack@...e.cz>
To:	Phillip Susi <psusi@...ntu.com>
Cc:	Howard Chu <hyc@...as.com>,
	Chris Friesen <chris.friesen@...band.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Johannes Weiner <hannes@...xchg.org>, Jan Kara <jack@...e.cz>,
	linux-kernel <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: mmap vs fs cache

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@...e.cz>
SUSE Labs, CR
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