Messages in this thread | | | Subject | Re: [RFC PATCHv3] perf tools: add event grouping capability to "perf stat" | From | Peter Zijlstra <> | Date | Thu, 25 Nov 2010 07:32:40 +0100 |
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On Wed, 2010-11-24 at 17:54 -0800, Corey Ashford wrote: > Add the ability to create multiple event groups, each with their own leader > using the existing "-e <event>[,<event> ...] [-e <event>[,<event>]]" > syntax. Each additional -e switch creates a new group, and each event > listed within a -e switch is within that group. > > Changes since v1: > - Because of a flub, v2 did not contain the changes I had intended to make, > and instead, v2 had the same patch contents as v1. > - When perf stat is not supplied any events on the command line, put > each default event in its own group.
I like this, but could you also extend this to perf-record? its a bit odd to diverge between the two.
Using Stephane's latest syntax changes you could actually do something like:
perf record -e task-clock:freq=1000,cycles:period=0
Which would create a group with 1 sampling counter and a counting counter (at which point we should probably start flipping PERF_SAMPLE_READ).
Matt was working on supporting that (although not through cmdline syntax) and teaching perf-report to cope with such output.
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