Messages in this thread | | | Date | Wed, 22 Feb 2012 13:57:29 -0500 | Subject | Re: perf record: can I specify multiple events and use different sample-after value | From | Yuanfang Chen <> |
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On Wed, Feb 22, 2012 at 1:01 AM, Namhyung Kim <namhyung.kim@lge.com> wrote: > 2012-02-22 10:59 AM, Yuanfang Chen wrote: >> >> Hi all, >> > > Hi, > > > >> 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. > > BTW, it seems you were using old version of perf (and kernel too, maybe). > I have no idea if your perf wouldn't support the option. :)
You are right. my perf version is 3.0.0, just updated to 3.3.0-rc4. --show-total-period works now.
> > The "-l" option was meaningful only if you specified events more than the > actual number of counters in the PMU.
So -l is for multiplexing?
> > > >> Another question is that how can I specify multiple events and use >> different sample-after value for each of them? like perf record -c >> 10000,2000000,2000000 -e r2d4,r03c,r0c0 >> > > It's not possible now. You should run a number of instances of perf for > that purpose AFAIK. > > > Thanks, > Namhyung
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