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

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Date:	Tue, 27 May 2014 09:34:22 -0500 (CDT)
From:	Christoph Lameter <cl@...two.org>
To:	Peter Zijlstra <peterz@...radead.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, 27 May 2014, Peter Zijlstra wrote:

> The things I care about for VM_PINNED are long term pins, like the IB
> stuff, which sets up its RDMA buffers at the start of a program and
> basically leaves them in place for the entire duration of said program.

Ok that also means the pages are not to be allocated from ZONE_MOVABLE?

I expected the use of a page flag. With a vma flag we may have a situation
that mapping a page into a vma changes it to pinned and terminating a
process may unpin a page. That means the zone that the page should be
allocated from changes.

Pinned pages in ZONE_MOVABLE are not a good idea. But since "kernelcore"
is rarely used maybe that is not an issue?




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