Messages in this thread | | | Date | Wed, 1 Jul 2009 13:24:06 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH 4/6 -tip] perf_counter: Add Generalized Hardware interrupt support for AMD |
| |
* Jaswinder Singh Rajput <jaswinder@kernel.org> 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
| |