linux-kernel - Re: [PATCH 2/2] x86, perf: Optimize stack walk user accesses

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Message-ID: <20151020173219.GI3533@two.firstfloor.org>
Date:	Tue, 20 Oct 2015 19:32:20 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Andi Kleen <andi@...stfloor.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 2/2] x86, perf: Optimize stack walk user accesses

> Perf can call this function from !interrupt context (imagine a
> tracepoint or other software event), should we therefore not add a
> pagefault_disable()/enable() pair around the entire while() loop?

That's true. I'll add the pagefault_disable/enable.

-Andi
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