Messages in this thread |  | | | Date | Sat, 4 Jul 2009 12:22:30 +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:
> On Wed, 2009-07-01 at 13:24 +0200, Ingo Molnar wrote: > > * 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. > > > > Please let me know that addition of software counter will be in > this patch or we can do it incrementally after this patch.
It should be in this series. That way we can cross-check whether the soft counts and the hard counts match up and find potential bugs that way, etc.
Ingo
|  |