Re: [PATCH 10/17] 2.6.17.1 perfmon2 patch for review: PMU context switch

[Stephane Eranian]

Andi,

As a first step, I am looking at implementing a TIF_DEBUG
for x86-64. AFAIK, debug registers must not be inherited on
fork().

In copy_thread(), I do not see the place where the child's
debug registers (or just debugreg7) are cleared to avoid
reloading the parents values in __switch_to() if debugreg7
is not 0. I believe the debug registers values are copied
in dup_task_struct().

Am I missing something?

--
-Stephane
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