Re: [RFC][PATCH 5/5] perfcounter: Add support for kernel hardware breakpoints

[Frédéric Weisbecker]

2009/7/20, Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>:
> On Mon, 2009-07-20 at 13:08 -0400, Frederic Weisbecker wrote:
>> This adds the support for kernel hardware breakpoints in perfcounter.
>> It is added as a new type of software counter and can be defined by
>> using the counter number 5 and by passsing the address of the
>> breakpoint to set through the config attribute.
>
>
>> +void bp_perf_triggered(struct hw_breakpoint *bp, struct pt_regs *regs)
>> +{
>> +	unsigned long target = hw_breakpoint_addr(bp);
>> +
>> +	struct perf_sample_data data = {
>> +		.regs = regs,
>> +		.addr = instruction_pointer(regs),
>> +	};
>> +
>> +	do_perf_swcounter_event(PERF_TYPE_BREAKPOINT, target, 1, 0, &data);
>> +}
>
> .addr would be an associated data address, like for pagefaults and
> cache-misses have, its not the RIP of the faulting ins.

Ah ok, then I'll set the actual data memory address that is breakpointed.

Thanks.
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