linux_dsm_epyc7002/arch/powerpc/perf
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 powerpc/perf: Move perf core & PMU code into a subdirectory 2012-02-23 10:50:04 +11:00
mpc7450-pmu.c powerpc/perf: Move perf core & PMU code into a subdirectory 2012-02-23 10:50:04 +11:00
power4-pmu.c powerpc/perf: Fix instruction address sampling on 970 and Power4 2012-03-28 11:33:24 +11:00
power5-pmu.c powerpc/perf: Move perf core & PMU code into a subdirectory 2012-02-23 10:50:04 +11:00
power5+-pmu.c powerpc/perf: Move perf core & PMU code into a subdirectory 2012-02-23 10:50:04 +11:00
power6-pmu.c powerpc/perf: Move perf core & PMU code into a subdirectory 2012-02-23 10:50:04 +11:00
power7-pmu.c powerpc/perf: Add missing L2 constraint handling in Power7 PMU 2012-11-15 13:00:36 +11:00
ppc970-pmu.c powerpc/perf: Fix instruction address sampling on 970 and Power4 2012-03-28 11:33:24 +11:00