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| author | sukadev@linux.vnet.ibm.com <sukadev@linux.vnet.ibm.com> | 2013-01-24 13:25:23 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-01-29 11:35:07 +1100 |
| commit | f53d168c025f27d64417a56bf129dbb39d2e1189 (patch) | |
| tree | 094e0912b1fa861bc7eca5958ded86b437fa9164 /arch/powerpc/kernel | |
| parent | 94c95cfbfe784eca5f4b96955e41bda1318605bc (diff) | |
| download | blackbird-op-linux-f53d168c025f27d64417a56bf129dbb39d2e1189.tar.gz blackbird-op-linux-f53d168c025f27d64417a56bf129dbb39d2e1189.zip | |
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>
Diffstat (limited to 'arch/powerpc/kernel')
0 files changed, 0 insertions, 0 deletions
