linux-kernel - Re: [patch] mm: reduce pagetable-freeing latencies

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Message-Id: <1185485715.5495.127.camel@localhost.localdomain>
Date:	Fri, 27 Jul 2007 07:35:15 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Hugh Dickins <hugh@...itas.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: [patch] mm: reduce pagetable-freeing latencies

On Thu, 2007-07-26 at 18:11 +0100, Hugh Dickins wrote:
> That will often be the case for anonymous pages, but not for pagecache
> pages.  I had wondered whether to make exit_mmap unmap the stack first
> (rather than text first as usually happens), but seems rather a hack.

Yup and defeated by HIGHMEM ,so I'm back to per-cpu page lists for now
and we'll see how to move to the next step once I've ironed out other
issues such as sparc64/ia64 related bits.

Ben.


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