linux-kernel - Re: [RFC][PATCH 07/11] perf: Provide PERF_SAMPLE

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Date:	Wed, 03 Mar 2010 18:39:55 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org, paulus@...ba.org,
	robert.richter@....com, fweisbec@...il.com,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [RFC][PATCH 07/11] perf: Provide PERF_SAMPLE_REGS

On Wed, 2010-03-03 at 09:30 -0800, Stephane Eranian wrote:
> This assumes struct pt_regs is somehow exported to userland.
> Is that the case?

I seems to have understood they were, and asm/ptrace.h seems to agree
with that, it has !__KERNEL__ definitions for struct pt_regs.

> I would clearly spell out that the REGS are the interrupted REGS,
> not the overflow REGS. Maybe PERF_SAMPLE_IREGS. 

They can be both, for PEBS they are the overflow trap (until PEBS does
fault) regs.

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