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| author |   Anton Blanchard <anton@samba.org> | 2012-02-15 18:48:22 +0000 |
|---|---|---|
| committer |   Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-02-16 16:24:35 +1100 |
| commit | 9a45a9407c69d068500923480884661e2b9cc421 (patch) | |
| tree | 8ff43b5fd98ab68352dc4dd0823401a5736afab2 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | powerpc/adb: Use set_current_state() (diff) | |
| download | linux-dev-9a45a9407c69d068500923480884661e2b9cc421.tar.xz linux-dev-9a45a9407c69d068500923480884661e2b9cc421.zip | |
powerpc/perf: power_pmu_start restores incorrect values, breaking frequency events
perf on POWER stopped working after commit e050e3f0a71b (perf: Fix
broken interrupt rate throttling). That patch exposed a bug in
the POWER perf_events code.
Since the PMCs count upwards and take an exception when the top bit
is set, we want to write 0x80000000 - left in power_pmu_start. We were
instead programming in left which effectively disables the counter
until we eventually hit 0x80000000. This could take seconds or longer.
With the patch applied I get the expected number of samples:
SAMPLE events: 9948
Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: <stable@kernel.org>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions