From: Keith Owens <kaos@ocs.com.au>
To: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
Cc: "'Ingo Molnar'" <mingo@elte.hu>,
David.Mosberger@acm.org, "Andrew Morton" <akpm@osdl.org>,
linux-kernel@vger.kernel.org, linux-ia64@vger.kernel.org
Subject: Re: Add prefetch switch stack hook in scheduler function
Date: Fri, 29 Jul 2005 17:45:42 +1000 [thread overview]
Message-ID: <10766.1122623142@kao2.melbourne.sgi.com> (raw)
In-Reply-To: Your message of "Fri, 29 Jul 2005 00:22:43 MST." <200507290722.j6T7Mig07477@unix-os.sc.intel.com>
On Fri, 29 Jul 2005 00:22:43 -0700,
"Chen, Kenneth W" <kenneth.w.chen@intel.com> wrote:
>On ia64, we have two kernel stacks, one for outgoing task, and one for
>incoming task. for outgoing task, we haven't called switch_to() yet.
>So the switch stack structure for 'current' will be allocated immediately
>below current 'sp' pointer. For the incoming task, it was fully ctx'ed out
>previously, so switch stack structure is immediate above kernel_stack(next).
>It Would be beneficial to prefetch both stacks.
struct switch_stack for current is all write data, no reading is done.
Is it worth doing prefetchw() for current? IOW, is there any
measurable performance gain?
next prev parent reply other threads:[~2005-07-29 7:56 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-07-27 22:07 Add prefetch switch stack hook in scheduler function Chen, Kenneth W
2005-07-27 23:13 ` Andrew Morton
2005-07-27 23:23 ` david mosberger
2005-07-28 7:41 ` Ingo Molnar
2005-07-28 8:09 ` Keith Owens
2005-07-28 8:16 ` Ingo Molnar
2005-07-28 9:09 ` Ingo Molnar
2005-07-28 19:14 ` Chen, Kenneth W
2005-07-29 7:04 ` Ingo Molnar
2005-07-29 7:07 ` Ingo Molnar
2005-07-29 8:30 ` Eric Dumazet
2005-07-29 8:44 ` Ingo Molnar
2005-07-31 16:27 ` hashed spinlocks Daniel Walker
2005-07-31 18:46 ` David S. Miller
2005-07-31 19:06 ` Daniel Walker
2005-07-31 19:11 ` David S. Miller
2005-07-31 19:16 ` Daniel Walker
2005-07-29 8:30 ` Add prefetch switch stack hook in scheduler function Chen, Kenneth W
2005-07-29 8:35 ` Ingo Molnar
2005-07-29 8:39 ` Chen, Kenneth W
2005-07-29 9:17 ` Peter Zijlstra
2005-07-29 10:52 ` Ingo Molnar
2005-07-29 7:22 ` Chen, Kenneth W
2005-07-29 7:45 ` Keith Owens [this message]
2005-07-29 8:02 ` Chen, Kenneth W
2005-07-29 8:28 ` Ingo Molnar
2005-07-29 9:02 ` Russell King
2005-07-29 9:45 ` Ingo Molnar
2005-07-29 7:38 ` Keith Owens
2005-07-29 8:08 ` Chen, Kenneth W
2005-07-28 8:31 ` Nick Piggin
2005-07-28 8:35 ` Ingo Molnar
2005-07-28 8:48 ` Nick Piggin
2005-07-28 9:16 ` Ingo Molnar
2005-07-28 9:19 ` Ingo Molnar
2005-07-28 9:34 ` Nick Piggin
2005-07-28 10:04 ` Ingo Molnar
2005-07-28 10:29 ` Nick Piggin
-- strict thread matches above, loose matches on Subject: below --
2005-07-29 15:18 linux
2005-07-29 15:49 ` Ingo Molnar
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