linux-kernel - Re: [PATCH v6] add MAP

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Message-ID: <84144f021001182337o274c8ed3q8ce60581094bc2b9@mail.gmail.com>
Date:	Tue, 19 Jan 2010 09:37:05 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Gleb Natapov <gleb@...hat.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-mm@...ck.org,
	kosaki.motohiro@...fujitsu.com, linux-kernel@...r.kernel.org,
	linux-api@...r.kernel.org, akpm@...ux-foundation.org,
	andrew.c.morrow@...il.com,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH v6] add MAP_UNLOCKED mmap flag

Hi Gleb,

On Tue, Jan 19, 2010 at 9:17 AM, Gleb Natapov <gleb@...hat.com> wrote:
> The thread took a direction of bashing mlockall(). This is especially
> strange since proposed patch actually makes mlockall() more fine
> grained and thus more useful.

No, the thread took a direction of you not being able to properly
explain why we want MMAP_UNLOCKED in the kernel. It seems useless for
real-time and I've yet to figure out why you need _mlockall()_ if it's
a performance thing.

It would be probably useful if you could point us to the application
source code that actually wants this feature.

                        Pekka
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