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

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Message-ID: <20100118181942.GD22111@redhat.com>
Date:	Mon, 18 Jan 2010 20:19:42 +0200
From:	Gleb Natapov <gleb@...hat.com>
To:	Pekka Enberg <penberg@...helsinki.fi>
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

On Mon, Jan 18, 2010 at 08:09:26PM +0200, Pekka Enberg wrote:
> 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?
> 
I can't realistically chase every address space mapping changes and mlock
new areas. The only way other then mlockall() is to use custom memory
allocator that allocates mlocked memory.
 
--
			Gleb.
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