Re: [PATCH 4/6 -tip] perf_counter: Add Generalized Hardwareinterrupt support for AMD

[Ingo Molnar]

* Jaswinder Singh Rajput <jaswinder@xxxxxxxxxx> wrote:

> 
> $ ./perf stat -e interrupts -e masked -e int-pending-mask-cycles -- ls -lR /usr/include/ > /dev/null
> 
>  Performance counter stats for 'ls -lR /usr/include/':
> 
>             377  interrupts
>        53429936  int-mask-cycles
>            1119  int-pending-mask-cycles
> 
>     0.371457539  seconds time elapsed

Agreed, this is another useful generalization - and the 'cycles 
pending' metrics are not retrievable via any software means.

We could and should probably add a software counter for hardirqs as 
wel. That would allow the vector/irqnr information to be passed in, 
and it would allow architectures without irq metrics in the PMU to 
have this counter too.

This way we could profile based on a specific interrupt source only 
- say based on the networking card.

	Ingo
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