From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: Ingo Molnar <mingo@elte.hu>, Jens Axboe <jens.axboe@oracle.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: x86: Is there still value in having a special tlb flush IPI vector?
Date: Mon, 28 Jul 2008 23:29:18 -0700 [thread overview]
Message-ID: <488EB8BE.8050806@goop.org> (raw)
In-Reply-To: <20080729021215.GG30344@one.firstfloor.org>
Andi Kleen wrote:
>>> Now that normal smp_function_call is no longer an enormous bottleneck,
>>>
>
> Hmm? It still uses a global lock at least as of current git tree.
Yes, but it's only held briefly to put things onto the list. It doesn't
get held over the whole IPI transaction as the old smp_call_function
did, and the tlb flush code still does. RCU is used to manage the list
walk and freeing, so there's no long-held locks there either.
J
next prev parent reply other threads:[~2008-07-29 6:29 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-28 23:16 x86: Is there still value in having a special tlb flush IPI vector? Jeremy Fitzhardinge
2008-07-28 23:20 ` Jeremy Fitzhardinge
2008-07-29 2:12 ` Andi Kleen
2008-07-29 6:29 ` Jeremy Fitzhardinge [this message]
2008-07-29 12:02 ` Andi Kleen
2008-07-29 14:46 ` Jeremy Fitzhardinge
2008-07-29 14:58 ` Andi Kleen
2008-07-28 23:34 ` Ingo Molnar
2008-07-29 4:30 ` Nick Piggin
2008-07-29 6:19 ` Jeremy Fitzhardinge
2008-07-29 9:47 ` Nick Piggin
2008-07-29 9:54 ` Peter Zijlstra
2008-07-29 10:00 ` Nick Piggin
2008-07-29 10:04 ` Peter Zijlstra
2008-07-29 10:17 ` Nick Piggin
2008-07-29 10:23 ` Peter Zijlstra
2008-07-29 10:45 ` Peter Zijlstra
2008-07-31 16:48 ` Ingo Molnar
2008-08-01 1:32 ` Nick Piggin
2008-07-31 17:48 ` Jeremy Fitzhardinge
2008-07-31 20:57 ` Ingo Molnar
2008-07-31 21:15 ` Peter Zijlstra
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