linux-kernel - Re: [PATCH] RFC x86_64 more accurate KSTK

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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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