From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Thomas Gleixner <tglx@linutronix.de>,
Andrew Morton <akpm@linux-foundation.org>,
Mike Travis <travis@sgi.com>
Subject: Re: [git pull] core/percpu for v2.6.27
Date: Tue, 15 Jul 2008 08:46:57 -0700 [thread overview]
Message-ID: <487CC671.3000501@goop.org> (raw)
In-Reply-To: <alpine.LFD.1.10.0807141525000.2944@woody.linux-foundation.org>
Linus Torvalds wrote:
> Can you explain what this does and who needs it? The percpu_xchg() looks
> particularly pointless, since it's always a locked SMP-safe instruction on
> x86, so a nonpreemptible load+store will likely be much faster.
The essence of those changes is to work towards unifying the i386 and
x86-64 percpu mechanisms. But I wasn't terribly convinced by some of
the frills around the edges, like the xchg operation. The work is being
driven by Mike Travis and the huge numa people, so perhaps they have a
use for it.
J
next prev parent reply other threads:[~2008-07-15 15:47 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-14 14:34 [git pull] core/percpu for v2.6.27 Ingo Molnar
2008-07-14 22:27 ` Linus Torvalds
2008-07-15 15:46 ` Jeremy Fitzhardinge [this message]
2008-07-15 21:00 ` Ingo Molnar
2008-07-15 21:26 ` Mike Travis
2008-07-15 21:46 ` H. Peter Anvin
2008-07-18 22:17 ` Ingo Molnar
2008-07-18 22:54 ` Mike Travis
2008-07-25 15:18 ` Mike Travis
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