Messages in this thread | | | Date | Tue, 23 Jun 2009 10:24:11 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH 2/2 -tip] perf_counter: parse-events.c introduce alias member in event_symbol |
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* Jaswinder Singh Rajput <jaswinder@kernel.org> wrote:
> On Mon, 2009-06-22 at 16:10 +0200, Ingo Molnar wrote: > > yeah, somethig like that. I'd suggest to print out the actual > > measured events: > > > > cache-references 10123 events > > cache-misses 15 events > > > > and if something does not appear to be ticking then do something > > like: > > > > cache-misses <inactive> > > > > I.e. 'perf test' could be a quick way both to users and to > > developers to see all possible hw and sw events. > > > > Perhaps builtin-test.c should also do specific testcases for certain > > counters - say intentionally migrate to a CPU and back to see the > > CPU-migration count. > > > > Also, you seem to have copied builtin-stat.c, right? Try to > > librarize as much of the functionality (into util/*) to make the > > resulting linecount increase as small as possible. > > perf test also need some command to execute otherwise it will also > show long list of <inactive>
I think what it should do is to execute test-cases _internally_. Not just execute some random command on the system and hope for events.
> I think better I should support all events in perf stat so user > can get better information from it and we can all add some other > testing option to it.
I agree - see my previous mail about how to achieve this better: we should extend event string parsing with wildcards (regex) and with 'set of events' symbols that act as convenient specifiers for certain typical uses.
> Anyway currently it looks like this : > > [RFC][PATCH] perf_counter tools: introduce perf test to test event for ticks > > perf test to Test performance counter events, its output on AMD box : > > ./perf test -a -- ls -lR > /dev/null > > Performance counter stats for 'ls' -lR: > > cycles 1226819954 > instructions 283680441 > cache-references 144893559 > cache-misses 3268438 > branches 37488241 > branch-misses 2464027 > bus-cycles <inactive> > cpu-clock-msecs 17175506056 > task-clock-msecs 17175086665 > page-faults 488 > minor-faults 488 > major-faults <inactive>
We should try to provoke a real major fault (i.e. a fault with IO) here. Not sure how though :-)
> context-switches 7956 > CPU-migrations 7
this needs to be provoked intentionally via sched_setaffinity(): first migrate to cpu0, then to cpu1.
> L1-data-Cache-Load-Referencees 398303881 > L1-data-Cache-Load-Misses 3552374 > L1-data-Cache-Store-Referencees 270178 > L1-data-Cache-Store-Misses <inactive>
this is probably inactive due to AMD not having events for that and the generic cache event being 0 there, right?
> L1-data-Cache-Prefetch-Referencees 611622 > L1-data-Cache-Prefetch-Misses 399730 > L1-instruction-Cache-Load-Referencees 124696447 > L1-instruction-Cache-Load-Misses 2912802 > L1-instruction-Cache-Store-Referencees <inactive> > L1-instruction-Cache-Store-Misses <inactive> > L1-instruction-Cache-Prefetch-Referencees 156576 > L1-instruction-Cache-Prefetch-Misses <inactive> > L2-Cache-Load-Referencees 4312353 > L2-Cache-Load-Misses 470382 > L2-Cache-Store-Referencees 4392945 > L2-Cache-Store-Misses <inactive> > L2-Cache-Prefetch-Referencees <inactive> > L2-Cache-Prefetch-Misses <inactive> > Data-TLB-Cache-Load-Referencees 127076487 > Data-TLB-Cache-Load-Misses 1930048 > Data-TLB-Cache-Store-Referencees <inactive> > Data-TLB-Cache-Store-Misses <inactive> > Data-TLB-Cache-Prefetch-Referencees <inactive> > Data-TLB-Cache-Prefetch-Misses <inactive> > Instruction-TLB-Cache-Load-Referencees 132768077 > Instruction-TLB-Cache-Load-Misses 6406 > Instruction-TLB-Cache-Store-Referencees <inactive> > Instruction-TLB-Cache-Store-Misses <inactive> > Instruction-TLB-Cache-Prefetch-Referencees <inactive> > Instruction-TLB-Cache-Prefetch-Misses <inactive> > Branch-Cache-Load-Referencees 58030210 > Branch-Cache-Load-Misses 3257804 > Branch-Cache-Store-Referencees <inactive> > Branch-Cache-Store-Misses <inactive> > Branch-Cache-Prefetch-Referencees <inactive> > Branch-Cache-Prefetch-Misses <inactive> > > 8.681671511 seconds time elapsed.
looks nice.
Ingo
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