[PATCH] oprofile, powerpc: Handle events that raise an exception without overflowing

[Robert Richter]

On 23.05.11 10:22:40, Eric B Munson wrote:
> Commit 0837e3242c73566fc1c0196b4ec61779c25ffc93 fixes a situation on POWER7
> where events can roll back if a specualtive event doesn't actually complete.
> This can raise a performance monitor exception.  We need to catch this to ensure
> that we reset the PMC.  In all cases the PMC will be less than 256 cycles from
> overflow.
> 
> This patch lifts Anton's fix for the problem in perf and applies it to oprofile
> as well.
> 
> Signed-off-by: Eric B Munson <emunson at mgebm.net>
> Cc: <stable at kernel.org> # as far back as it applies cleanly
> ---
>  arch/powerpc/oprofile/op_model_power4.c |   24 +++++++++++++++++++++++-
>  1 files changed, 23 insertions(+), 1 deletions(-)

I applied the fix to oprofile/urgent.

Thanks Eric,

-Robert

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Advanced Micro Devices, Inc.
Operating System Research Center