From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>,
LKML <linux-kernel@vger.kernel.org>,
Al Viro <viro@zeniv.linux.org.uk>, Ingo Molnar <mingo@kernel.org>,
Eric Dumazet <edumazet@google.com>
Subject: Re: [PATCH V2] task_work: avoid unneeded cmpxchg() in task_work_run()
Date: Wed, 10 Oct 2012 19:50:58 +0200 [thread overview]
Message-ID: <1349891458.1279.23.camel@twins> (raw)
In-Reply-To: <20121010175032.GA22642@redhat.com>
On Wed, 2012-10-10 at 19:50 +0200, Oleg Nesterov wrote:
>
> But you did not answer, and I am curious. What was your original
> motivation? Is xchg really faster than cmpxchg?
And is this true over multiple architectures? Or are we optimizing for
x86_64 (again) ?
prev parent reply other threads:[~2012-10-10 17:51 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-08 9:18 [PATCH] task_work: avoid unneeded cmpxchg() in task_work_run() Lai Jiangshan
2012-10-08 12:38 ` Oleg Nesterov
2012-10-09 11:04 ` Peter Zijlstra
2012-10-10 5:37 ` [PATCH V2] " Lai Jiangshan
2012-10-10 17:50 ` Oleg Nesterov
2012-10-10 17:50 ` Peter Zijlstra [this message]
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