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

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Message-ID: <84144f021001181009m52f7eaebp2bd746f92de08da9@mail.gmail.com>
Date:	Mon, 18 Jan 2010 20:09:26 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Gleb Natapov <gleb@...hat.com>
Cc:	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 Mon, Jan 18, 2010 at 7:08 PM, Gleb Natapov <gleb@...hat.com> wrote:
>> "Greater control" is not an argument for adding a new API that needs
>> to be maintained forever, a real world use case is.
>>
> If there is real world use case for mlockall() there is real use case for
> this too. People seems to be trying to convince me that I don't need
> mlockall() without proposing alternatives. The only alternative I see
> lock everything from userspace.
>
>> And yes, this stuff needs to be in the changelog. Whether you want to
>> spell it out or post an URL to some previous discussion is up to you.
> The discussion was here just a couple of days ago. Here is the link
> were I describe my use case: http://marc.info/?l=linux-mm&m=126345374125942&w=2
> If you think it needs to be spelled out in commit log I'll do it.

So this is a performance thing? Btw, is there are reason you can't use
plain mlock() for it as suggested by Peter earlier?

                        Pekka
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