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Subject: Re: [RFC][PATCH 07/11] perf: Provide PERF_SAMPLE_REGS
From: Peter Zijlstra <peterz@infradead.org>
To: Stephane Eranian <eranian@google.com>
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Date: Wed, 03 Mar 2010 18:39:55 +0100
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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.