From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Bharata B Rao <bharata.rao@gmail.com>,
Li Zefan <lizf@cn.fujitsu.com>, Ingo Molnar <mingo@elte.hu>,
Paul Menage <menage@google.com>,
Balbir Singh <balbir@linux.vnet.ibm.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] cpuacct: add a branch prediction
Date: Thu, 26 Feb 2009 13:20:06 +0100 [thread overview]
Message-ID: <1235650806.4948.71.camel@laptop> (raw)
In-Reply-To: <145d0010d65060bb089d5a87e06cbd0d.squirrel@webmail-b.css.fujitsu.com>
On Thu, 2009-02-26 at 21:06 +0900, KAMEZAWA Hiroyuki wrote:
> Hmm.. some routine like
> atomic64_read() can help this ? (But I don't want to use atomic_t here..)
Yeah, atomic64_t has been proposed numerous times, and x86 could
actually implement that using cmpxchg8b, just not sure about all the
other 32bit archs, and if we start using it in the scheduler, they'd
better have it implemented.
Furthermore, it would require all the ops to be atomic, which would
require them all to use cmpxchg8b and its a horridly expensive op to
use :-(
next prev parent reply other threads:[~2009-02-26 12:20 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-26 7:40 [PATCH] cpuacct: add a branch prediction Li Zefan
2009-02-26 8:07 ` KAMEZAWA Hiroyuki
2009-02-26 8:17 ` Li Zefan
2009-02-26 8:22 ` KAMEZAWA Hiroyuki
2009-02-26 8:35 ` Li Zefan
2009-02-26 8:40 ` KAMEZAWA Hiroyuki
2009-02-26 10:10 ` Bharata B Rao
2009-02-26 10:28 ` KAMEZAWA Hiroyuki
2009-02-26 10:44 ` Peter Zijlstra
2009-02-26 10:55 ` KAMEZAWA Hiroyuki
2009-02-26 11:22 ` Peter Zijlstra
2009-02-26 11:17 ` KAMEZAWA Hiroyuki
2009-02-26 11:28 ` Peter Zijlstra
2009-02-26 12:06 ` KAMEZAWA Hiroyuki
2009-02-26 12:20 ` Peter Zijlstra [this message]
2009-02-26 12:26 ` Ingo Molnar
2009-02-26 12:40 ` Arnd Bergmann
2009-02-27 4:25 ` Paul Mackerras
2009-02-26 16:45 ` Paul E. McKenney
2009-02-27 0:58 ` KAMEZAWA Hiroyuki
2009-02-27 1:29 ` Paul E. McKenney
2009-02-27 3:22 ` [RFC][PATCH] remove rq->lock from cpuacct cgroup (Was " KAMEZAWA Hiroyuki
2009-03-02 14:56 ` Peter Zijlstra
2009-03-02 23:42 ` KAMEZAWA Hiroyuki
2009-03-03 7:51 ` Peter Zijlstra
2009-03-03 9:04 ` KAMEZAWA Hiroyuki
2009-03-03 9:40 ` Peter Zijlstra
2009-03-03 10:42 ` KAMEZAWA Hiroyuki
2009-03-03 10:44 ` KAMEZAWA Hiroyuki
2009-03-03 11:54 ` Peter Zijlstra
2009-03-04 6:32 ` [PATCH] remove rq->lock from cpuacct cgroup v2 KAMEZAWA Hiroyuki
2009-03-04 7:54 ` Bharata B Rao
2009-03-04 8:20 ` KAMEZAWA Hiroyuki
2009-03-04 8:46 ` KAMEZAWA Hiroyuki
2009-03-04 10:35 ` Bharata B Rao
2009-03-04 12:11 ` Bharata B Rao
2009-03-04 14:17 ` KAMEZAWA Hiroyuki
2009-02-26 8:37 ` [PATCH] cpuacct: add a branch prediction Balbir Singh
2009-02-26 8:41 ` Li Zefan
2009-02-26 10:40 ` Balbir Singh
2009-02-26 10:43 ` Peter Zijlstra
2009-02-26 8:43 ` KAMEZAWA Hiroyuki
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