From: Linus Torvalds <torvalds@linux-foundation.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Jens Axboe <jens.axboe@oracle.com>,
Steven Rostedt <rostedt@goodmis.org>,
Andrew Morton <akpm@linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>,
Rusty Russell <rusty@rustcorp.com.au>,
npiggin@suse.de, Ingo Molnar <mingo@elte.hu>,
Thomas Gleixner <tglx@linutronix.de>,
Arjan van de Ven <arjan@infradead.org>
Subject: Re: [PATCH -v3] use per cpu data for single cpu ipi calls
Date: Fri, 30 Jan 2009 08:04:01 -0800 (PST) [thread overview]
Message-ID: <alpine.LFD.2.00.0901300800350.3150@localhost.localdomain> (raw)
In-Reply-To: <1233318733.4495.174.camel@laptop>
On Fri, 30 Jan 2009, Peter Zijlstra wrote:
>
> Signed-off-by: Steven Rostedt <srostedt@redhat.com>
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
My only question is whetherr we might even drop the kmalloc() some day:
I suspect that the CSD_FLAG_LOCK is essentially never a contention point,
and the cost (and occasional synchronization) of kmalloc() quite possibly
overwhelms any theoretical scaling ability.
If another CPU hasn't even received its IPI before the same CPU sends the
next one, I'm not sure we _want_ to send one, in fact.
But that's a secondary issue, and isn't a correctness thing, just a "do we
really need three different allocations?" musing..
Linus
next prev parent reply other threads:[~2009-01-30 16:05 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-28 16:38 Buggy IPI and MTRR code on low memory Steven Rostedt
2009-01-28 16:41 ` Steven Rostedt
2009-01-28 16:46 ` Peter Zijlstra
2009-01-28 16:56 ` Steven Rostedt
2009-01-28 17:00 ` Peter Zijlstra
2009-01-28 17:24 ` Steven Rostedt
2009-01-28 18:20 ` Peter Zijlstra
2009-01-28 18:52 ` Steven Rostedt
2009-01-28 18:22 ` Arjan van de Ven
2009-01-28 18:34 ` Steven Rostedt
2009-01-28 21:12 ` Andrew Morton
2009-01-28 21:13 ` Andrew Morton
2009-01-28 21:23 ` Steven Rostedt
2009-01-28 22:07 ` Andrew Morton
2009-01-28 22:47 ` Steven Rostedt
2009-01-28 23:20 ` Andrew Morton
2009-01-28 23:50 ` Steven Rostedt
2009-01-28 23:25 ` Rusty Russell
2009-01-28 23:41 ` Steven Rostedt
2009-01-29 0:52 ` [PATCH] use per cpu data for single cpu ipi calls Steven Rostedt
2009-01-29 1:30 ` Andrew Morton
2009-01-29 1:56 ` Steven Rostedt
2009-01-29 8:49 ` Peter Zijlstra
2009-01-29 11:13 ` Ingo Molnar
2009-01-29 11:41 ` Peter Zijlstra
2009-01-29 13:42 ` Ingo Molnar
2009-01-29 14:07 ` Steven Rostedt
2009-01-29 15:08 ` [PATCH -v2] " Steven Rostedt
2009-01-29 15:33 ` Peter Zijlstra
2009-01-29 16:17 ` Ingo Molnar
2009-01-29 17:21 ` Linus Torvalds
2009-01-29 17:44 ` Steven Rostedt
2009-01-29 17:50 ` Steven Rostedt
2009-01-29 18:08 ` Linus Torvalds
2009-01-29 18:11 ` Steven Rostedt
2009-01-29 18:23 ` Peter Zijlstra
2009-01-29 18:31 ` Steven Rostedt
2009-01-29 18:39 ` Linus Torvalds
2009-01-29 18:44 ` Peter Zijlstra
2009-01-30 11:23 ` Jens Axboe
2009-01-30 12:32 ` [PATCH -v3] " Peter Zijlstra
2009-01-30 12:38 ` Jens Axboe
2009-01-30 12:48 ` Peter Zijlstra
2009-01-30 12:55 ` Jens Axboe
2009-01-30 12:56 ` Jens Axboe
2009-01-30 13:00 ` Peter Zijlstra
2009-01-30 13:02 ` [PATCH -v4] " Peter Zijlstra
2009-01-30 14:51 ` Ingo Molnar
2009-01-30 16:04 ` Linus Torvalds [this message]
2009-01-30 16:16 ` [PATCH -v3] " Peter Zijlstra
2009-01-31 8:44 ` Jens Axboe
2009-01-29 18:49 ` [PATCH -v2] " Ingo Molnar
2009-01-30 1:55 ` Rusty Russell
2009-01-29 17:47 ` Peter Zijlstra
2009-01-29 17:55 ` Peter Zijlstra
2009-01-29 18:08 ` Steven Rostedt
2009-01-30 1:11 ` Rusty Russell
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