From: "H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
To: Mathieu Desnoyers
<mathieu.desnoyers-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>,
Andrew Morton
<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
Russell King <linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>,
Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>,
Ingo Molnar <mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Paul Turner <pjt-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Andrew Hunter <ahh-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Peter Zijlstra <peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>,
Andi Kleen <andi-Vw/NltI1exuRpAAqCnN02g@public.gmane.org>,
Dave Watson <davejwatson-b10kYP2dOMg@public.gmane.org>,
Chris Lameter <cl-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>,
Ben Maurer <bmaurer-b10kYP2dOMg@public.gmane.org>,
Steven Rostedt <rostedt-nx8X9YLhiw1AfugRpC6u6w@public.gmane.org>,
"Paul E. McKenney"
<paulmck-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>,
Josh Triplett <josh-iaAMLnmF4UmaiuxdJuQwMA@public.gmane.org>,
Linus Torvalds
<torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
Catalin Marinas <catalin.marinas-5wv7dgnIgG8@public.gmane.org>,
Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>,
Michael Kerrisk
<mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH v4 0/5] getcpu_cache system call for 4.6
Date: Tue, 23 Feb 2016 17:36:26 -0800 [thread overview]
Message-ID: <56CD091A.4060009@zytor.com> (raw)
In-Reply-To: <1456270120-7560-1-git-send-email-mathieu.desnoyers-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
On 02/23/2016 03:28 PM, Mathieu Desnoyers wrote:
> Hi,
>
> Here is a patchset implementing a cache for the CPU number of the
> currently running thread in user-space.
>
> Benchmarks comparing this approach to a getcpu based on system call on
> ARM show a 44x speedup. They show a 14x speedup on x86-64 compared to
> executing lsl from a vDSO through glibc.
>
> I'm added a man page in the changelog of patch 1/3, which shows an
> example usage of this new system call.
>
> This series is based on v4.5-rc5, submitted for Linux 4.6.
>
> Feedback is welcome,
>
What is the resulting context switch overhead?
-hpa
WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa@zytor.com>
To: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Andrew Morton <akpm@linux-foundation.org>,
Russell King <linux@arm.linux.org.uk>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>
Cc: linux-kernel@vger.kernel.org, linux-api@vger.kernel.org,
Paul Turner <pjt@google.com>, Andrew Hunter <ahh@google.com>,
Peter Zijlstra <peterz@infradead.org>,
Andy Lutomirski <luto@amacapital.net>,
Andi Kleen <andi@firstfloor.org>,
Dave Watson <davejwatson@fb.com>, Chris Lameter <cl@linux.com>,
Ben Maurer <bmaurer@fb.com>, Steven Rostedt <rostedt@goodmis.org>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Josh Triplett <josh@joshtriplett.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Michael Kerrisk <mtk.manpages@gmail.com>
Subject: Re: [PATCH v4 0/5] getcpu_cache system call for 4.6
Date: Tue, 23 Feb 2016 17:36:26 -0800 [thread overview]
Message-ID: <56CD091A.4060009@zytor.com> (raw)
In-Reply-To: <1456270120-7560-1-git-send-email-mathieu.desnoyers@efficios.com>
On 02/23/2016 03:28 PM, Mathieu Desnoyers wrote:
> Hi,
>
> Here is a patchset implementing a cache for the CPU number of the
> currently running thread in user-space.
>
> Benchmarks comparing this approach to a getcpu based on system call on
> ARM show a 44x speedup. They show a 14x speedup on x86-64 compared to
> executing lsl from a vDSO through glibc.
>
> I'm added a man page in the changelog of patch 1/3, which shows an
> example usage of this new system call.
>
> This series is based on v4.5-rc5, submitted for Linux 4.6.
>
> Feedback is welcome,
>
What is the resulting context switch overhead?
-hpa
next prev parent reply other threads:[~2016-02-24 1:36 UTC|newest]
Thread overview: 96+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-23 23:28 [PATCH v4 0/5] getcpu_cache system call for 4.6 Mathieu Desnoyers
[not found] ` <1456270120-7560-1-git-send-email-mathieu.desnoyers-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2016-02-23 23:28 ` [PATCH v4 1/5] getcpu_cache system call: cache CPU number of running thread Mathieu Desnoyers
2016-02-23 23:28 ` Mathieu Desnoyers
2016-02-24 11:11 ` Thomas Gleixner
2016-02-24 17:17 ` Mathieu Desnoyers
2016-02-25 23:32 ` Rasmus Villemoes
2016-02-25 23:32 ` Rasmus Villemoes
2016-02-26 17:47 ` Mathieu Desnoyers
[not found] ` <1456270120-7560-2-git-send-email-mathieu.desnoyers-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2016-02-25 9:56 ` Peter Zijlstra
2016-02-25 9:56 ` Peter Zijlstra
[not found] ` <20160225095635.GO6356-ndre7Fmf5hadTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2016-02-25 16:55 ` Mathieu Desnoyers
2016-02-25 16:55 ` Mathieu Desnoyers
[not found] ` <390571988.7745.1456419326288.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2016-02-25 17:04 ` Peter Zijlstra
2016-02-25 17:04 ` Peter Zijlstra
[not found] ` <20160225170416.GV6356-ndre7Fmf5hadTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2016-02-25 17:17 ` Mathieu Desnoyers
2016-02-25 17:17 ` Mathieu Desnoyers
[not found] ` <2135602720.7810.1456420671941.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2016-02-26 11:33 ` Peter Zijlstra
2016-02-26 11:33 ` Peter Zijlstra
[not found] ` <20160226113304.GA6356-ndre7Fmf5hadTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2016-02-26 16:29 ` Thomas Gleixner
2016-02-26 16:29 ` Thomas Gleixner
2016-02-26 17:20 ` Mathieu Desnoyers
[not found] ` <967083634.8940.1456507201156.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2016-02-26 18:01 ` Thomas Gleixner
2016-02-26 18:01 ` Thomas Gleixner
2016-02-26 20:24 ` Mathieu Desnoyers
2016-02-26 20:24 ` Mathieu Desnoyers
2016-02-26 23:04 ` H. Peter Anvin
[not found] ` <7096DA23-3908-40DC-A46B-C4CF2252CEE8-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2016-02-27 0:40 ` Mathieu Desnoyers
2016-02-27 0:40 ` Mathieu Desnoyers
[not found] ` <1150363257.9781.1456533630895.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2016-02-27 6:24 ` H. Peter Anvin
2016-02-27 6:24 ` H. Peter Anvin
[not found] ` <56D14132.5050100-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2016-02-27 14:15 ` Mathieu Desnoyers
2016-02-27 14:15 ` Mathieu Desnoyers
[not found] ` <2053850250.10158.1456582501604.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2016-02-27 14:58 ` Peter Zijlstra
2016-02-27 14:58 ` Peter Zijlstra
[not found] ` <20160227145809.GD6356-ndre7Fmf5hadTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2016-02-27 18:35 ` Linus Torvalds
2016-02-27 18:35 ` Linus Torvalds
2016-02-27 23:53 ` Mathieu Desnoyers
[not found] ` <CA+55aFwcgwRxvVBz5kk_3O8dESXAGJ4KHBkf=pSXjiS7Xh4NwA@mail.gmail.com>
[not found] ` <1082926946.10326.1456619994590.JavaMail.zimbra@efficios.com>
[not found] ` <1082926946.10326.1456619994590.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2016-02-28 0:57 ` Linus Torvalds
2016-02-28 0:57 ` Linus Torvalds
[not found] ` <CA+55aFwZY1BR5NdjAP-rytd29hE2EZEXgcaBKjepWFFj+oR1SA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-02-28 14:32 ` Mathieu Desnoyers
2016-02-28 14:32 ` Mathieu Desnoyers
[not found] ` <1538518747.10504.1456669948568.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2016-02-29 10:35 ` Peter Zijlstra
2016-02-29 10:35 ` Peter Zijlstra
[not found] ` <20160229103506.GJ6356-ndre7Fmf5hadTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2016-03-01 20:23 ` Mathieu Desnoyers
2016-03-01 20:23 ` Mathieu Desnoyers
[not found] ` <676569856.13488.1456863792603.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2016-03-01 21:32 ` Peter Zijlstra
2016-03-01 21:32 ` Peter Zijlstra
[not found] ` <20160301213202.GY6357-ndre7Fmf5hadTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2016-03-01 21:36 ` Peter Zijlstra
2016-03-01 21:36 ` Peter Zijlstra
2016-03-01 21:47 ` H. Peter Anvin
2016-03-02 10:34 ` Peter Zijlstra
2016-02-29 10:32 ` Peter Zijlstra
2016-02-29 10:32 ` Peter Zijlstra
[not found] ` <20160229103221.GI6356-ndre7Fmf5hadTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2016-02-29 10:39 ` Arnd Bergmann
2016-02-29 10:39 ` Arnd Bergmann
2016-02-29 12:41 ` Mathieu Desnoyers
2016-02-29 12:41 ` Mathieu Desnoyers
[not found] ` <1811549980.11849.1456749709589.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2016-02-29 13:08 ` Arnd Bergmann
2016-02-29 13:08 ` Arnd Bergmann
2016-02-29 18:19 ` H. Peter Anvin
2016-02-29 18:19 ` H. Peter Anvin
2016-03-02 10:44 ` Geert Uytterhoeven
2016-03-02 10:44 ` Geert Uytterhoeven
2016-03-01 18:25 ` H. Peter Anvin
2016-03-01 18:25 ` H. Peter Anvin
[not found] ` <56D5DEA8.3040908-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2016-03-01 18:40 ` Mathieu Desnoyers
2016-03-01 18:40 ` Mathieu Desnoyers
[not found] ` <CA+55aFysWipEagSdgeXbLx+Au4vomvyttdNFJtM+HffmBECQiA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-02-27 19:01 ` H. Peter Anvin
2016-02-27 19:01 ` H. Peter Anvin
2016-02-28 13:07 ` Geert Uytterhoeven
2016-02-28 13:07 ` Geert Uytterhoeven
[not found] ` <CAMuHMdV2dHsJfchyHBnQEAVEMSQ+1N7X4-iqGZ7K7J=Lf8qs4A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-02-28 16:21 ` Linus Torvalds
2016-02-28 16:21 ` Linus Torvalds
2016-02-29 10:01 ` Peter Zijlstra
2016-02-29 10:01 ` Peter Zijlstra
2016-02-27 15:04 ` H. Peter Anvin
2016-02-27 15:04 ` H. Peter Anvin
2016-02-24 1:36 ` H. Peter Anvin [this message]
2016-02-24 1:36 ` [PATCH v4 0/5] getcpu_cache system call for 4.6 H. Peter Anvin
2016-02-24 4:09 ` Mathieu Desnoyers
[not found] ` <1452699925.6549.1456286963485.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2016-02-24 20:07 ` H. Peter Anvin
2016-02-24 20:07 ` H. Peter Anvin
[not found] ` <F6BC367F-127F-4254-8E4E-E7BF60A027F3-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2016-02-24 22:38 ` Mathieu Desnoyers
2016-02-24 22:38 ` Mathieu Desnoyers
2016-02-23 23:28 ` [PATCH v4 2/5] getcpu_cache: ARM resume notifier Mathieu Desnoyers
2016-02-23 23:28 ` [PATCH v4 3/5] getcpu_cache: wire up ARM system call Mathieu Desnoyers
[not found] ` <1456270120-7560-4-git-send-email-mathieu.desnoyers-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2016-02-24 0:54 ` kbuild test robot
2016-02-24 0:54 ` kbuild test robot
2016-02-24 1:05 ` [PATCH v4 (updated)] " Mathieu Desnoyers
2016-02-24 1:05 ` Mathieu Desnoyers
[not found] ` <1456275925-12071-1-git-send-email-mathieu.desnoyers-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2016-02-24 5:28 ` kbuild test robot
2016-02-24 5:28 ` kbuild test robot
2016-02-24 6:54 ` kbuild test robot
2016-02-24 6:54 ` kbuild test robot
2016-02-23 23:28 ` [PATCH v4 4/5] getcpu_cache: x86 32/64 resume notifier Mathieu Desnoyers
2016-02-23 23:28 ` [PATCH v4 5/5] getcpu_cache: wire up x86 32/64 system call Mathieu Desnoyers
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