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    SubjectRe: [RFC][PATCH 07/11] perf: Provide PERF_SAMPLE_REGS
    On Wed, Mar 3, 2010 at 9:55 AM, David Miller <> wrote:
    > From: Stephane Eranian <>
    > Date: Wed, 3 Mar 2010 09:49:33 -0800
    >> On Wed, Mar 3, 2010 at 9:39 AM, Peter Zijlstra <> 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.
    > BTW, how are you going to cope with compat systems?
    > If I build 'perf' on a sparc64 kernel build, it's going to get the
    > 64-bit pt_regs.  So I can't then use that binary on a sparc box
    > running a 32-bit kernel.
    > And vice versa.
    That was going to be my next question. The pt_regs you return
    depends on the binary you are monitoring (32 vs. 64) if interrupt
    occurred in userland. But what about if it happens in kernel mode?

    > And more generally aren't we supposed to be able to eventually analyze
    > perf dumps on any platform not just the one 'perf' was built under?
    > We'll need to do something about the encoding of pt_regs, therefore.

    Stephane Eranian  | EMEA Software Engineering
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