From: "H. Peter Anvin" <hpa@zytor.com>
To: Andrew Lutomirski <luto@mit.edu>
Cc: Borislav Petkov <bp@alien8.de>,
melwyn lobo <linux.melwyn@gmail.com>,
Denys Vlasenko <vda.linux@googlemail.com>,
Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Linus Torvalds <torvalds@linux-foundation.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
borislav.petkov@amd.com
Subject: Re: x86 memcpy performance
Date: Mon, 15 Aug 2011 11:26:57 -0700 [thread overview]
Message-ID: <4E4964F1.1020900@zytor.com> (raw)
In-Reply-To: <CAObL_7HAhSaknKRD=0BGWYdZaanX9fOc+i2B74K844T=1r6yGg@mail.gmail.com>
On 08/15/2011 09:58 AM, Andrew Lutomirski wrote:
> On Mon, Aug 15, 2011 at 12:12 PM, H. Peter Anvin <hpa@zytor.com> wrote:
>> On 08/15/2011 08:36 AM, Andrew Lutomirski wrote:
>>>
>>> (*) kernel_fpu_begin is a bad name. It's only safe to use integer
>>> instructions inside a kernel_fpu_begin section because MXCSR (and the
>>> 387 equivalent) could contain garbage.
>>>
>>
>> Uh... no, it just means you have to initialize the settings. It's a
>> perfectly good name, it's called kernel_fpu_begin, not kernel_fp_begin.
>
> I prefer get_xstate / put_xstate, but this could rapidly devolve into
> bikeshedding. :)
>
a) Quite.
b) xstate is not architecture-neutral.
-hpa
next prev parent reply other threads:[~2011-08-15 18:28 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-15 14:55 x86 memcpy performance Borislav Petkov
2011-08-15 14:59 ` Andy Lutomirski
2011-08-15 15:29 ` Borislav Petkov
2011-08-15 15:36 ` Andrew Lutomirski
2011-08-15 16:12 ` Borislav Petkov
2011-08-15 17:04 ` Andrew Lutomirski
2011-08-15 18:49 ` Borislav Petkov
2011-08-15 19:11 ` Andrew Lutomirski
2011-08-15 20:05 ` Borislav Petkov
2011-08-15 20:08 ` Andrew Lutomirski
2011-08-15 16:12 ` H. Peter Anvin
2011-08-15 16:58 ` Andrew Lutomirski
2011-08-15 18:26 ` H. Peter Anvin [this message]
2011-08-15 18:35 ` Andrew Lutomirski
2011-08-15 18:52 ` H. Peter Anvin
2011-08-16 7:19 ` melwyn lobo
2011-08-16 7:43 ` Borislav Petkov
-- strict thread matches above, loose matches on Subject: below --
2011-08-12 17:59 melwyn lobo
2011-08-12 18:33 ` Andi Kleen
2011-08-12 19:52 ` Ingo Molnar
2011-08-14 9:59 ` Borislav Petkov
2011-08-14 11:13 ` Denys Vlasenko
2011-08-14 12:40 ` Borislav Petkov
2011-08-15 13:27 ` melwyn lobo
2011-08-15 13:44 ` Denys Vlasenko
2011-08-16 2:34 ` Valdis.Kletnieks
2011-08-16 12:16 ` Borislav Petkov
2011-09-01 15:15 ` Maarten Lankhorst
2011-09-01 16:18 ` Linus Torvalds
2011-09-08 8:35 ` Borislav Petkov
2011-09-08 10:58 ` Maarten Lankhorst
2011-09-09 8:14 ` Borislav Petkov
2011-09-09 10:12 ` Maarten Lankhorst
2011-09-09 11:23 ` Maarten Lankhorst
2011-09-09 13:42 ` Borislav Petkov
2011-09-09 14:39 ` Linus Torvalds
2011-09-09 15:35 ` Borislav Petkov
2011-12-05 12:20 ` melwyn lobo
2011-12-05 12:54 ` melwyn lobo
2011-12-05 14:36 ` Alan Cox
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