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From: Jens Axboe <jens.axboe@oracle.com>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: linux-kernel@vger.kernel.org, npiggin@suse.de, dgc@sgi.com
Subject: Re: [PATCH 1/7] x86-64: introduce fast variant of smp_call_function_single()
Date: Sun, 16 Mar 2008 19:45:07 +0100	[thread overview]
Message-ID: <20080316184506.GW17940@kernel.dk> (raw)
In-Reply-To: <47DAC21C.1040805@goop.org>

On Fri, Mar 14 2008, Jeremy Fitzhardinge wrote:
> Jens Axboe wrote:
> >rom: Nick Piggin <npiggin@suse.de>
> >  
> 
> Why is this necessary?  How is smp_call_function_single slow?

Because it's completely serialized by the call_lock spinlock.

-- 
Jens Axboe


  reply	other threads:[~2008-03-16 18:45 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-12 11:55 [PATCH 0/7] IO CPU affinity testing series Jens Axboe
2008-03-12 11:55 ` [PATCH 1/7] x86-64: introduce fast variant of smp_call_function_single() Jens Axboe
2008-03-14 18:21   ` Jeremy Fitzhardinge
2008-03-16 18:45     ` Jens Axboe [this message]
2008-03-16 22:58       ` Jeremy Fitzhardinge
2008-03-17  2:24         ` Nick Piggin
2008-03-17  7:25         ` Jens Axboe
2008-03-12 11:55 ` [PATCH 2/7] x86-64: speedup and tweak smp_call_function_single() Jens Axboe
2008-03-12 11:55 ` [PATCH 3/7] x86: add fast smp_call_function_single() Jens Axboe
2008-03-12 11:55 ` [PATCH 4/7] block: split softirq handling into blk-softirq.c Jens Axboe
2008-03-12 11:55 ` [PATCH 5/7] Add interface for queuing work on a specific CPU Jens Axboe
2008-03-12 11:55 ` [PATCH 6/7] block: make kblockd_schedule_work() take the queue as parameter Jens Axboe
2008-03-12 11:55 ` [PATCH 7/7] block: add test code for testing CPU affinity Jens Axboe
2008-03-12 16:41 ` [PATCH 0/7] IO CPU affinity testing series Alan D. Brunelle
2008-03-12 17:54   ` Jens Axboe
2008-03-12 20:37 ` Max Krasnyanskiy
2008-03-13 12:13   ` Jens Axboe
2008-03-13 14:54 ` Alan D. Brunelle
2008-03-13 15:00   ` Jens Axboe

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