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

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Message-Id: <20091006190938.126F.A69D9226@jp.fujitsu.com>
Date:	Tue,  6 Oct 2009 19:11:06 +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
Subject: Re: [PATCH][RFC] add MAP_UNLOCKED mmap flag

Hi

> 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. 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>

Why don't you use explicit munlock()?
Plus, Can you please elabrate which workload nedd this feature?



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