linux-kernel - Re: [RFC][PATCH 0/5] VM

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Date:	Tue, 27 May 2014 17:31:43 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Christoph Lameter <cl@...two.org>
Cc:	Konstantin Khlebnikov <koct9i@...il.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Roland Dreier <roland@...nel.org>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	Mike Marciniszyn <infinipath@...el.com>
Subject: Re: [RFC][PATCH 0/5] VM_PINNED

On Tue, May 27, 2014 at 10:14:10AM -0500, Christoph Lameter wrote:
> On Tue, 27 May 2014, Peter Zijlstra wrote:
> 
> > Well, like with IB, they start out as normal userspace pages, and will
> > be from ZONE_MOVABLE.
> 
> Well we could change that now I think. If the VMA has VM_PINNED set
> pages then do not allocate from ZONE_MOVABLE.

But most allocations sites don't have the vma. We allocate page-cache
pages based on its address_space/mapping, not on whatever vma they're
mapped into.

So I still think the sanest way to do this is by making mm_mpin() do a
mm_populate() and have reclaim skip VM_PINNED pages (so they stay
present), and then migrate the lot out of MOVABLE.


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