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

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Date:	Thu, 14 Jan 2010 09:31:03 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Gleb Natapov <gleb@...hat.com>
Cc:	kosaki.motohiro@...fujitsu.com, 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

> 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.



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