linux-kernel - Re: mmap vs fs cache

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Message-ID: <513DF239.2000806@ubuntu.com>
Date:	Mon, 11 Mar 2013 11:03:21 -0400
From:	Phillip Susi <psusi@...ntu.com>
To:	Jan Kara <jack@...e.cz>
CC:	Howard Chu <hyc@...as.com>,
	Chris Friesen <chris.friesen@...band.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-kernel <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: mmap vs fs cache

On 3/11/2013 7:52 AM, Jan Kara wrote:
>> 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...

Oh, don't know how I missed that... I was just looking for it the other 
day and couldn't find any references to VM_RandomReadHint so I assumed 
it hadn't been implemented.


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