linux-kernel - Re: [RFC][PATCH] Anonymous shared memory (ashmem) subsystem

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Date:	Tue, 19 Jul 2011 09:33:56 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	John Stultz <john.stultz@...aro.org>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Robert Love <rlove@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>, Mel Gorman <mel@....ul.ie>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Rik van Riel <riel@...hat.com>,
	Eric Anholt <eric@...olt.net>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [RFC][PATCH] Anonymous shared memory (ashmem) subsystem

On Mon, 18 Jul 2011, John Stultz wrote:

> Additionally, ashmem introduces the concept of page pinning. Pinned pages (the
> default) behave like any anonymous memory. Unpinned pages are available to the
> kernel for eviction during VM pressure. When repinning the pages, the return
> value instructs user-space as to any eviction. In this manner, user-space
> processes may implement caching and similar resource management that
> efficiently integrates with kernel memory management.

Memory locking (mlock) may be a better term to use here. mlock prevents
eviction. Page pinning also prevents the movement of the pages in memory
(as needed by page migration, compaction etc).

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