Messages in this thread | | | Date | Mon, 14 Mar 2011 21:51:02 +0100 | From | Frederic Weisbecker <> | Subject | Re: [RFC PATCH 0/4] perf: Custom contexts |
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On Mon, Mar 14, 2011 at 05:43:41PM -0300, Arnaldo Carvalho de Melo wrote: > Em Mon, Mar 14, 2011 at 08:17:59PM +0100, Frederic Weisbecker escreveu: > > Some examples: > > > > - Trace lock events inside irqs > > > > $ perf record -e irq:irq_handler_entry -e irq:irq_handler_exit \ > > -e lock:lock_acquire --starter 0 --stopper 1 --enable-on-starter \ > > perf bench sched messaging > > A more compact alternative that uses .. to delimit ranges (start and/or > stop), like git does for changeset ranges and @ to determine where to > enable the event: > > perf record -e instructions@irq:irq_handler_entry..irq:irq_handler_exit \ > perf bench sched messaging > > event-A at-range event-B to event-C > > open ended ranges being possible as well, i.e. start counting when > event-B triggers and stop only when the workload finishes, or count from > workload start till event-C triggers. > > > $ perf script > > > > perf-4300 [000] 2000.209721: irq_handler_entry: irq=40 name=ahci > > perf-4300 [000] 2000.209725: lock_acquire: 0xffff880037851c40 &(&host->lock)->rlock > > perf-4300 [000] 2000.209731: irq_handler_exit: irq=40 ret=handled > > perf-4300 [000] 2000.209821: irq_handler_entry: irq=40 name=ahci > > perf-4300 [000] 2000.209823: lock_acquire: 0xffff880037851c40 &(&host->lock)->rlock > > perf-4300 [000] 2000.209828: irq_handler_exit: irq=40 ret=handled > > - Count instructions inside softirqs, outside softirqs and everywhere: > > > > $ perf stat -e irq:softirq_entry -e irq:softirq_exit \ > > -e instructions --starter 0 --stopper 1 --enable-on-starter \ > > -e instructions --starter 1 --stopper 0 \ > > -e instructions ./perf bench sched messaging > > $ perf record -e instructions@irq:softirq_entry..irq:softirq_exit \ > -e instructions@irq:softirq_exit..irq:softirq_entry \ > -e instructions \ > perf bench sched messaging > > - Arnaldo
Agreed that's nice but may be more as a shortcut than a full replacement? Otherwise it becomes hard or unreadable to define a filter on a starter. Or a starter on a starter.
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