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Date:	Sun, 8 Nov 2009 13:55:27 +0100
From:	Ingo Molnar <>
To:	Stefani Seibold <>
Cc:	linux-kernel <>,
	Andrew Morton <>,
	"H. Peter Anvin" <>,
	Americo Wang <>,
	Thomas Gleixner <>,
	Andi Kleen <>
Subject: Re: [PATCH] RFC x86_64 more accurate KSTK_ESP implementation

* Stefani Seibold <> 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.

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