From: Florian Weimer <fweimer-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>
Cc: "Ben Maurer" <bmaurer-b10kYP2dOMg@public.gmane.org>,
"Ingo Molnar" <mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
libc-alpha <libc-alpha-9JcytcrH/bA+uJoB2kUjGw@public.gmane.org>,
linux-api <linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"Andrew Morton"
<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
"Ondřej Bílka" <neleai-9Vj9tDbzfuSlVyrhU4qvOw@public.gmane.org>,
rostedt <rostedt-nx8X9YLhiw1AfugRpC6u6w@public.gmane.org>,
"Linus Torvalds"
<torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
"Mathieu Desnoyers"
<mathieu.desnoyers-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>,
"Paul E. McKenney"
<paulmck-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>,
"Josh Triplett" <josh-iaAMLnmF4UmaiuxdJuQwMA@public.gmane.org>,
"Lai Jiangshan" <laijs-BthXqXjhjHXQFUHtdCDX3A@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>
Subject: Re: [RFC PATCH] getcpu_cache system call: caching current CPU number (x86)
Date: Mon, 20 Jul 2015 17:32:52 +0200 [thread overview]
Message-ID: <55AD14A4.6030101@redhat.com> (raw)
In-Reply-To: <CALCETrV9Vp5UUOb3e_R5tphyE-urBgTwQR2pFWUOOFnHqWXHKQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
On 07/20/2015 05:31 PM, Andy Lutomirski wrote:
> On Jul 20, 2015 1:35 AM, "Florian Weimer" <fweimer-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
>>
>> On 07/18/2015 01:33 AM, Andy Lutomirski wrote:
>>
>>> I think the API should be "set gsbase to x + y*(cpu number)". On
>>> x86_64, userspace just allocates a big swath of virtual space and
>>> populates it as needed.
>>
>> This will break WINE and similar applications which use %gs today.
>
> Presumably WINE could just opt not to use this facility, just like
> WINE will have to opt out of whatever the enterprise people who want
> WRGSBASE were thinking of doing with it.
How is this possible if it's process-global attribute and glibc or some
library in the process starts using it?
--
Florian Weimer / Red Hat Product Security
next prev parent reply other threads:[~2015-07-20 15:32 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-12 18:06 [RFC PATCH] getcpu_cache system call: caching current CPU number (x86) Mathieu Desnoyers
[not found] ` <1436724386-30909-1-git-send-email-mathieu.desnoyers-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2015-07-12 18:47 ` Josh Triplett
2015-07-13 3:40 ` Andy Lutomirski
2015-07-13 15:09 ` Mathieu Desnoyers
2015-07-13 3:38 ` Andy Lutomirski
[not found] ` <CALCETrV1suAbvMgD1jOEFyn3JcDE_hhi6X7+sGs9e3Oqw_6jUw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-07-13 15:27 ` Mathieu Desnoyers
[not found] ` <1050138282.1065.1436801252018.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2015-07-13 15:30 ` Andrew Hunter
[not found] ` <CADroS=7MnUULrjDeQtmscxjkpjCtti9V-HfFXU0sjKhi6PsaAg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-07-13 16:07 ` Mathieu Desnoyers
2015-07-13 18:36 ` Andy Lutomirski
2015-07-13 11:17 ` Ben Maurer
[not found] ` <5CDDBDF2D36D9F43B9F5E99003F6A0D48D5F39C6-f8hGUhss0nh9TZdEUguypQ2O0Ztt9esIQQ4Iyu8u01E@public.gmane.org>
2015-07-13 17:36 ` Mathieu Desnoyers
2015-07-14 9:34 ` Ben Maurer
[not found] ` <5CDDBDF2D36D9F43B9F5E99003F6A0D48D5F5DA0-f8hGUhss0nh9TZdEUguypQ2O0Ztt9esIQQ4Iyu8u01E@public.gmane.org>
2015-07-16 18:08 ` Mathieu Desnoyers
[not found] ` <549319255.383.1437070088597.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2015-07-16 19:27 ` Andy Lutomirski
2015-07-17 10:21 ` Ondřej Bílka
2015-07-17 15:53 ` Andy Lutomirski
[not found] ` <CALCETrWEKE=mow3vVh7C4r8CuGy_d5VOEz7KkpijuR5cpBfFtg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-07-17 18:48 ` Linus Torvalds
[not found] ` <CA+55aFz-VBnEKh0SPKgu8xV5=Zb+=6odybVUDoOYOknshbcFJA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-07-17 18:55 ` Andy Lutomirski
[not found] ` <CALCETrVNcLpZVATHOs-gZR9AMUSW_ScvXW_0oY=OnFHXXHLdaA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-07-17 19:11 ` Linus Torvalds
2015-07-17 23:28 ` Ondřej Bílka
2015-07-17 23:33 ` Andy Lutomirski
2015-07-18 10:35 ` Ondřej Bílka
[not found] ` <CALCETrVY=kjeA_4pazy3BL+ekfcV6WHKw8e3z-LBxx_uP1bw2Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-07-20 8:35 ` Florian Weimer
[not found] ` <55ACB2DC.5010503-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-07-20 15:31 ` Andy Lutomirski
[not found] ` <CALCETrV9Vp5UUOb3e_R5tphyE-urBgTwQR2pFWUOOFnHqWXHKQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-07-20 15:32 ` Florian Weimer [this message]
[not found] ` <55AD14A4.6030101-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-07-20 17:41 ` Andy Lutomirski
[not found] ` <CALCETrUx6wFxmz+9TyW5bNgaMN0q180G8y9YOyq_D41sdhFaRQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-07-20 20:07 ` josh-iaAMLnmF4UmaiuxdJuQwMA
2015-07-21 7:55 ` Florian Weimer
[not found] ` <CA+55aFzMJkzydXb7uVv1iSUnp=539d43ghQaonGdzMoF7QLZBA@mail.gmail.com>
[not found] ` <CA+55aFzMJkzydXb7uVv1iSUnp=539d43ghQaonGdzMoF7QLZBA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-07-20 21:09 ` Andy Lutomirski
2015-07-20 22:39 ` Linus Torvalds
[not found] ` <CA+55aFwLZLeeN7UN82dyt=emQcNBc8qZPJAw5iqtAbBwFA7FPQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-07-21 0:25 ` Mathieu Desnoyers
[not found] ` <2010227315.699.1437438300542.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2015-07-21 7:30 ` Ondřej Bílka
2015-07-21 12:58 ` Mathieu Desnoyers
[not found] ` <894137397.137.1437483493715.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2015-07-21 15:16 ` Ondřej Bílka
2015-07-21 17:45 ` Mathieu Desnoyers
[not found] ` <1350114812.1035.1437500726799.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2015-07-21 18:00 ` Ondřej Bílka
2015-07-21 18:18 ` Mathieu Desnoyers
[not found] ` <2028561497.1088.1437502683664.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2015-07-22 7:53 ` Ondřej Bílka
2015-07-21 8:01 ` Florian Weimer
2015-07-20 13:18 ` Konstantin Khlebnikov
2015-07-18 7:34 ` Rich Felker
[not found] ` <20150718073433.GH1173-C3MtFaGISjmo6RMmaWD+6Sb1p8zYI1N1@public.gmane.org>
2015-07-18 10:51 ` Ondřej Bílka
2015-07-18 9:47 ` Florian Weimer
[not found] ` <587954201.31.1436808992876.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2015-07-17 10:58 ` Ondřej Bílka
2015-07-17 16:03 ` Mathieu Desnoyers
[not found] ` <626545401.1010.1437149010438.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2015-07-17 22:43 ` Ondřej Bílka
2015-07-18 2:43 ` Mathieu Desnoyers
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