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    SubjectRe: [RFC][PATCH 07/11] perf: Provide PERF_SAMPLE_REGS
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    On Wed, Mar 3, 2010 at 9:39 AM, Peter Zijlstra <peterz@infradead.org> wrote:
    > 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.
    >
    Seems to be the case, indeed.

    >> 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.

    You're saying without PEBS= interrupted state, with PEBS=overflow state.
    That precludes requesting both interrupted + overflow state when PEBS is
    enabled. That may be interesting to look at differences, distances (in the IP).


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