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Message-ID: <4AF6F323.5000005@zytor.com>
Date: Sun, 08 Nov 2009 08:34:43 -0800
From: "H. Peter Anvin" <hpa@...or.com>
To: Stefani Seibold <stefani@...bold.net>
CC: Ingo Molnar <mingo@...e.hu>,
linux-kernel <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Americo Wang <xiyou.wangcong@...il.com>,
Thomas Gleixner <tglx@...utronix.de>,
Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH] RFC x86_64 more accurate KSTK_ESP implementation
On 11/08/2009 06:00 AM, Stefani Seibold wrote:
> Am Sonntag, den 08.11.2009, 13:55 +0100 schrieb Ingo Molnar:
>> * Stefani Seibold <stefani@...bold.net> wrote:
>>
>>>> I'd suggest a competely different method: why dont you use an IPI to
>>>> sample the SP whenever someone wants to read it from /proc and we
>>>> see that the task is running on a CPU right now?
>>>
>>> Sounds like a challenge, i like the idea. I will have a look on it...
>>
>> It's not a fastpath, so smp_function_call() ought to do the trick.
>
> There is no function smp_function_call()...
>
smp_call_function().
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
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