Messages in this thread | | | Date | Mon, 15 Oct 2012 17:55:34 +0200 | From | Robert Richter <> | Subject | Re: [RFC][PATCH] perf: Add a few generic stalled-cycles events |
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On 11.10.12 18:28:39, Sukadev Bhattiprolu wrote: > + { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_STALLED_CYCLES_FIXED_POINT }, > + { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_STALLED_CYCLES_LOAD_STORE }, > + { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_STALLED_CYCLES_INSTRUCTION_FETCH }, > + { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_STALLED_CYCLES_BRANCH },
Instead of adding new hardware event types I would prefer to use raw events in conjunction with sysfs, see e.g. the intel-uncore implementation. Something like:
$ find /sys/bus/event_source/devices/cpu/events/ ... /sys/bus/event_source/devices/cpu/events/stalled-cycles-fixed-point /sys/bus/event_source/devices/cpu/events/stalled-cycles-load-store /sys/bus/event_source/devices/cpu/events/stalled-cycles-instruction-fetch /sys/bus/event_source/devices/cpu/events/stalled-cycles-branch ... $ cat /sys/bus/event_source/devices/cpu/events/stalled-cycles-fixed-point event=0xff,umask=0x00
Perf tool works then out-of-the-box with:
$ perf record -e cpu/stalled-cycles-fixed-point/ ...
The event string can easily be reused by other architectures as a quasi standard.
-Robert
-- Advanced Micro Devices, Inc. Operating System Research Center
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