From: Florian Weimer <fweimer-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: Linus Torvalds
<torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
Peter Zijlstra <peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Cc: Mathieu Desnoyers
<mathieu.desnoyers-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>,
"H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@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>,
Linux Kernel Mailing List
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
linux-api <linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Paul Turner <pjt-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Andrew Hunter <ahh-hpIqsD4AKlfQT0dZR+AlfA@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>,
rostedt <rostedt-nx8X9YLhiw1AfugRpC6u6w@public.gmane.org>,
"Paul E. McKenney"
<paulmck-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>,
Josh Triplett <josh-iaAMLnmF4UmaiuxdJuQwMA@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>,
Boqun Feng <boqun.feng-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: [RFC PATCH v6 1/5] Thread-local ABI system call: cache CPU number of running thread
Date: Thu, 7 Apr 2016 18:50:20 +0200 [thread overview]
Message-ID: <57068FCC.8000701@redhat.com> (raw)
In-Reply-To: <CA+55aFxrWx5pFN3LseaKpUHtB6nqXtkgP84seU3pjys-kq7utQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
On 04/07/2016 06:39 PM, Linus Torvalds wrote:
> Can anybody give a *coherent* and actual *real* reason why the kernel
> would ever care about anything else?
We already have a similar per-thread data structure, the robust mutex
list. The CPU ID is another one. So it's conceivable we might get
further such fields in the future.
(AFAICS set_robust_list was designed with such extensions in mind.)
Florian
WARNING: multiple messages have this Message-ID (diff)
From: Florian Weimer <fweimer@redhat.com>
To: Linus Torvalds <torvalds@linux-foundation.org>,
Peter Zijlstra <peterz@infradead.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Andrew Morton <akpm@linux-foundation.org>,
Russell King <linux@arm.linux.org.uk>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-api <linux-api@vger.kernel.org>,
Paul Turner <pjt@google.com>, Andrew Hunter <ahh@google.com>,
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>, rostedt <rostedt@goodmis.org>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Josh Triplett <josh@joshtriplett.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Michael Kerrisk <mtk.manpages@gmail.com>,
Boqun Feng <boqun.feng@gmail.com>
Subject: Re: [RFC PATCH v6 1/5] Thread-local ABI system call: cache CPU number of running thread
Date: Thu, 7 Apr 2016 18:50:20 +0200 [thread overview]
Message-ID: <57068FCC.8000701@redhat.com> (raw)
In-Reply-To: <CA+55aFxrWx5pFN3LseaKpUHtB6nqXtkgP84seU3pjys-kq7utQ@mail.gmail.com>
On 04/07/2016 06:39 PM, Linus Torvalds wrote:
> Can anybody give a *coherent* and actual *real* reason why the kernel
> would ever care about anything else?
We already have a similar per-thread data structure, the robust mutex
list. The CPU ID is another one. So it's conceivable we might get
further such fields in the future.
(AFAICS set_robust_list was designed with such extensions in mind.)
Florian
next prev parent reply other threads:[~2016-04-07 16:50 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-04 17:01 [RFC PATCH v6 0/5] Thread-local ABI system call (CPU number cache) Mathieu Desnoyers
2016-04-04 17:01 ` [RFC PATCH v6 1/5] Thread-local ABI system call: cache CPU number of running thread Mathieu Desnoyers
2016-04-04 17:11 ` H. Peter Anvin
2016-04-04 19:46 ` Mathieu Desnoyers
[not found] ` <492303698.44994.1459799188052.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2016-04-04 20:48 ` Mathieu Desnoyers
2016-04-04 20:48 ` Mathieu Desnoyers
[not found] ` <856357054.45028.1459802903401.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2016-04-05 16:02 ` Florian Weimer
2016-04-05 16:02 ` Florian Weimer
[not found] ` <5703E191.2040707-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-04-05 16:47 ` Peter Zijlstra
2016-04-05 16:47 ` Peter Zijlstra
2016-04-07 9:01 ` Florian Weimer
2016-04-07 10:31 ` Peter Zijlstra
[not found] ` <20160407103158.GP3430-ndre7Fmf5hadTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2016-04-07 10:39 ` Florian Weimer
2016-04-07 10:39 ` Florian Weimer
[not found] ` <570638D9.7010108-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-04-07 11:19 ` Peter Zijlstra
2016-04-07 11:19 ` Peter Zijlstra
[not found] ` <20160407111938.GR3430-ndre7Fmf5hadTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2016-04-07 12:03 ` Florian Weimer
2016-04-07 12:03 ` Florian Weimer
[not found] ` <57064CA9.101-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-04-07 12:25 ` Peter Zijlstra
2016-04-07 12:25 ` Peter Zijlstra
2016-04-07 12:37 ` Florian Weimer
[not found] ` <20160407122528.GS3430-ndre7Fmf5hadTX5a5knrm8zTDFooKrT+cvkQGrU6aU0@public.gmane.org>
2016-04-07 15:59 ` Mathieu Desnoyers
2016-04-07 15:59 ` Mathieu Desnoyers
2016-04-07 12:34 ` Mathieu Desnoyers
2016-04-07 12:34 ` Mathieu Desnoyers
2016-04-07 16:39 ` Linus Torvalds
2016-04-07 16:39 ` Linus Torvalds
[not found] ` <CA+55aFxrWx5pFN3LseaKpUHtB6nqXtkgP84seU3pjys-kq7utQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-04-07 16:46 ` Andy Lutomirski
2016-04-07 16:46 ` Andy Lutomirski
2016-04-07 16:50 ` Florian Weimer [this message]
2016-04-07 16:50 ` Florian Weimer
[not found] ` <57068FCC.8000701-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-04-07 16:59 ` Linus Torvalds
2016-04-07 16:59 ` Linus Torvalds
2016-04-07 16:52 ` Linus Torvalds
2016-04-07 16:52 ` Linus Torvalds
[not found] ` <CA+55aFyB6CPNiMKGWoaV7vxFWWBTgqOTqG4u2aNnq6uq1cHWZA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-04-07 18:43 ` Mathieu Desnoyers
2016-04-07 18:43 ` Mathieu Desnoyers
[not found] ` <1025228632.49344.1460054592801.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2016-04-07 20:22 ` Andi Kleen
2016-04-07 20:22 ` Andi Kleen
[not found] ` <20160407202232.GF9407-1g7Xle2YJi4/4alezvVtWx2eb7JE58TQ@public.gmane.org>
2016-04-07 20:55 ` Mathieu Desnoyers
2016-04-07 20:55 ` Mathieu Desnoyers
[not found] ` <1459789313-4917-2-git-send-email-mathieu.desnoyers-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2016-04-07 10:40 ` Florian Weimer
2016-04-07 10:40 ` Florian Weimer
2016-04-04 17:01 ` [RFC PATCH v6 2/5] Thread-local ABI cpu_id: ARM resume notifier Mathieu Desnoyers
2016-04-04 17:01 ` [RFC PATCH v6 3/5] Thread-local ABI: wire up ARM system call Mathieu Desnoyers
2016-04-04 17:01 ` [RFC PATCH v6 4/5] Thread-local ABI cpu_id: x86 32/64 resume notifier Mathieu Desnoyers
2016-04-04 17:01 ` [RFC PATCH v6 5/5] Thread-local ABI: wire up x86 32/64 system call Mathieu Desnoyers
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