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From: Ingo Molnar <mingo@elte.hu>
To: Hugh Dickins <hugh@veritas.com>
Cc: Andrew Morton <akpm@osdl.org>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH] mm: remove global locks from mm/highmem.c
Date: Mon, 29 Jan 2007 20:53:07 +0100	[thread overview]
Message-ID: <20070129195307.GA24434@elte.hu> (raw)
In-Reply-To: <Pine.LNX.4.64.0701291916420.10401@blonde.wat.veritas.com>


* Hugh Dickins <hugh@veritas.com> wrote:

> > For every 64-bit Fedora box there's more than seven 32-bit boxes. I 
> > think 32-bit is going to live with us far longer than many thought, 
> > so we might as well make it work better. Both HIGHMEM and HIGHPTE is 
> > the default on many distro kernels, which pushes the kmap 
> > infrastructure quite a bit.
> 
> But HIGHPTE uses kmap_atomic (in mainline: does -rt use kmap there?)

The contention i saw was on mainline and in the pagecache uses of 
kmap(). With HIGHPTE i only meant that typically every available highmem 
option is enabled on 32-bit distro kernel rpms, to make it work on as 
wide selection of hardware as possible. Sometimes PAE is split into a 
separate rpm, but mostly there's just one 32-bit kernel.

	Ingo

  reply	other threads:[~2007-01-29 19:54 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-28 14:11 Peter Zijlstra
2007-01-28 14:49 ` Christoph Hellwig
2007-01-28 15:17   ` Ingo Molnar
2007-01-28 15:28     ` Christoph Hellwig
2007-01-28 15:48       ` Ingo Molnar
2007-01-28 15:54         ` Christoph Hellwig
2007-01-28 18:19           ` Ingo Molnar
2007-01-28 22:29 ` Andrew Morton
2007-01-29  2:52   ` Nick Piggin
2007-01-29  9:44   ` Peter Zijlstra
2007-01-30  1:31     ` Martin J. Bligh
2007-01-30  1:41       ` Andrew Morton
2007-01-30  1:49         ` Martin J. Bligh
2007-01-30  2:15           ` Andrew Morton
2007-01-31  0:44             ` David Chinner
2007-01-31  1:11               ` Andrew Morton
2007-01-31  3:22                 ` David Chinner
2007-02-02 12:05                   ` Christoph Hellwig
2007-02-02 19:24                     ` Matt Mackall
2007-02-02 23:16                       ` David Chinner
2007-02-02 23:14                     ` David Chinner
2007-01-29 19:08   ` Ingo Molnar
2007-01-29 19:19     ` Hugh Dickins
2007-01-29 19:53       ` Ingo Molnar [this message]
2007-01-29 20:06     ` Ingo Molnar
2007-01-30  2:02     ` Nick Piggin

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