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

[Peter Zijlstra]

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.

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