Messages in this thread | | | Date | Thu, 23 Feb 2012 16:24:53 +0900 | From | Namhyung Kim <> | Subject | Re: perf record: can I specify multiple events and use different sample-after value |
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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?
Thanks, Namhyung
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