linux-kernel - Re: [patch] perf_event_open.2: 3.19 PERF_SAMPLE_REGS

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Message-ID: <20150302225807.GJ823@two.firstfloor.org>
Date:	Mon, 2 Mar 2015 23:58:07 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Vince Weaver <vincent.weaver@...ne.edu>
Cc:	Stephane Eranian <eranian@...gle.com>,
	Jiri Olsa <jolsa@...hat.com>,
	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
	linux-man@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Chuck Ebbert <cebbert.lkml@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [patch] perf_event_open.2: 3.19 PERF_SAMPLE_REGS_INTR support

> 	do not enable REGS_USER and REG_INTR at the same time
> 		as REGS_USER will have REG_INTR values and
> 		cannot be used for user stack unwinding

If that's true it would be a bug. But I doubt it.

The PEBS handler sets up its own pt_regs, so they should
be independent.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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