sukadev@linux.vnet.ibm.com f53d168c02 perf/Power: PERF_EVENT_IOC_ENABLE does not reenable event ... perf/Power: PERF_EVENT_IOC_ENABLE does not reenable event If we disable a perf event because we exceeded the specified ->event_limit, power_pmu_stop() sets the PERF_HES_STOPPED flag on the event. If the application then re-enables the event using PERF_EVENT_IOC_ENABLE ioctl, we don't ever clear this STOPPED flag. Consequently, the user space is never notified of the event. Following message has more background and test case. http://lists.eecs.utk.edu/pipermail/ptools-perfapi/2012-October/002528.html Used the following test cases to verify that this patch works on latest PAPI. $ papi.git/src/ctests/nonthread PAPI_TOT_CYC@5000000 $ papi.git/src/ctests/overflow_single_event Changelog[v2]: - [Paul Mackerras] Also clear PERF_HES_UPTODATE flag since we are restarting the event; cleanup comments and patch description. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>		2013-01-29 11:35:07 +11:00
..
callchain.c	powerpc/perf: Use perf_instruction_pointer in callchains	2012-07-10 19:18:46 +10:00
core-book3s.c	perf/Power: PERF_EVENT_IOC_ENABLE does not reenable event	2013-01-29 11:35:07 +11:00
core-fsl-emb.c	perf: Pass last sampling period to perf_sample_data_init()	2012-05-09 15:23:12 +02:00
e500-pmu.c	powerpc/perf: Add stalled-cycles events	2013-01-10 17:00:56 +11:00
Makefile
mpc7450-pmu.c
power4-pmu.c
power5-pmu.c
power5+-pmu.c
power6-pmu.c
power7-pmu.c	powerpc/perf: Add missing L2 constraint handling in Power7 PMU	2012-11-15 13:00:36 +11:00
ppc970-pmu.c