linux-kernel - Re: [PATCH v5] add MAP

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Message-ID: <20100114065008.GC18808@redhat.com>
Date:	Thu, 14 Jan 2010 08:50:08 +0200
From:	Gleb Natapov <gleb@...hat.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linux-api@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH v5] add MAP_UNLOCKED mmap flag

On Thu, Jan 14, 2010 at 09:31:03AM +0900, KOSAKI Motohiro wrote:
> > If application does mlockall(MCL_FUTURE) it is no longer possible to mmap
> > file bigger than main memory or allocate big area of anonymous memory
> > in a thread safe manner. Sometimes it is desirable to lock everything
> > related to program execution into memory, but still be able to mmap
> > big file or allocate huge amount of memory and allow OS to swap them on
> > demand. MAP_UNLOCKED allows to do that.
> >  
> > Signed-off-by: Gleb Natapov <gleb@...hat.com>
> > ---
> > 
> > I get reports that people find this useful, so resending.
> 
> This description is still wrong. It doesn't describe why this patch is useful.
> 
I think the text above describes the feature it adds and its use
case quite well. Can you elaborate what is missing in your opinion,
or suggest alternative text please?

--
			Gleb.
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