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SubjectRe: [PATCH 2/2 -tip] perf_counter: parse-events.c introduce alias member in event_symbol

* 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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