linux-kernel - Re: [PATCH -v2 -mm] add extra free kbytes tunable

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Date:	Thu, 13 Oct 2011 15:02:56 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Rik van Riel <riel@...hat.com>
cc:	Satoru Moriya <satoru.moriya@....com>,
	Con Kolivas <kernel@...ivas.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Randy Dunlap <rdunlap@...otime.net>,
	Satoru Moriya <smoriya@...hat.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	"lwoodman@...hat.com" <lwoodman@...hat.com>,
	Seiji Aguchi <saguchi@...hat.com>,
	Hugh Dickins <hughd@...gle.com>,
	"hannes@...xchg.org" <hannes@...xchg.org>
Subject: Re: [PATCH -v2 -mm] add extra free kbytes tunable

On Thu, 13 Oct 2011, Rik van Riel wrote:

> Userspace cannot be responsible, for the simple reason that
> the allocations might be done in the kernel.
> 
> Think about an mlocked realtime program handling network
> packets. Memory is allocated when packets come in, and when
> the program calls sys_send(), which causes packets to get
> sent.
> 
> I don't see how we can make userspace responsible for
> kernel-side allocations.
> 

All of this is what Minchan was proposing by allowing a mempool of kernel 
memory to be preallocated and managed by the memory controller.
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