Messages in this thread | | | Date | Thu, 23 Feb 2012 13:52:09 -0500 | Subject | Re: perf record: can I specify multiple events and use different sample-after value | From | Yuanfang Chen <> |
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On Thu, Feb 23, 2012 at 1:51 PM, Yuanfang Chen <cyfmxc@gmail.com> wrote: > On Thu, Feb 23, 2012 at 2:24 AM, Namhyung Kim <namhyung.kim@lge.com> wrote: >> 2012-02-23 4:03 AM, Yuanfang Chen wrote: >>> >>> On Wed, Feb 22, 2012 at 6:40 AM, Namhyung Kim <namhyung@gmail.com> wrote: >>>> >>>> Namhyung Kim <namhyung.kim@lge.com> wrote: >>>>> >>>>> 2012-02-22 10:59 AM, Yuanfang Chen wrote: >>>>>> >>>>>> I'm trying use perf tool from the linux kernel package to measure >>>>>> several raw PMU events. In the manpage of perf-record there is an "-l" >>>>>> option (Scale counter values), which is useful for my case because I >>>>>> want to know the total counter value, not just sample count. However >>>>>> it seems the -l is not recognized, is this expected? How can I get a >>>>>> total count? >>>>> >>>>> >>>>> "perf report --show-total-period" will be your friend. >>>> >>>> >>>> Or else, why not simply run "perf stat"? >>> >>> >>> My purpose is to get some PMU counter value during each time interval, >>> only perf record can do this. When using perf record -F, I have to add >>> up all period value for some event in a some interval to get that >>> value. When perf record -c, things get a easier, just (sample count x >>> sample after value) will do, only hassle is to get sample count in >>> some time interval. However, perf record don't have an option to do >>> this. >>> >> >> I still don't get it. Why "perf stat -e <events> -p <pid> -- sleep >> <interval>" >> doesn't work for you? It will show you the value, won't it? > > say my application(not an existing process, so -p <pid> does not > work.) run for 10 seconds. I want the r03c, r2d4 value during each > second. So there will be two values for each event in one second.
oops, forgot to forward. :-)
> >> >> Thanks, >> Namhyung -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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