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| author |   Kan Liang <kan.liang@linux.intel.com> | 2021-04-14 07:36:29 -0700 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2021-04-16 16:32:42 +0200 |
| commit | 46ade4740bbf9bf4e804ddb2c85845cccd219f3c (patch) | |
| tree | f9daafc5262424ad7e8d20404c07999d59bd2863 /arch/x86/events/perf_event.h | |
| parent | selftests/perf_events: Add kselftest for remove_on_exec (diff) | |
| download | linux-dev-46ade4740bbf9bf4e804ddb2c85845cccd219f3c.tar.xz linux-dev-46ade4740bbf9bf4e804ddb2c85845cccd219f3c.zip | |
perf/x86: Move cpuc->running into P4 specific code
The 'running' variable is only used in the P4 PMU. Current perf sets the
variable in the critical function x86_pmu_start(), which wastes cycles
for everybody not running on P4.
Move cpuc->running into the P4 specific p4_pmu_enable_event().
Add a static per-CPU 'p4_running' variable to replace the 'running'
variable in the struct cpu_hw_events. Saves space for the generic
structure.
The p4_pmu_enable_all() also invokes the p4_pmu_enable_event(), but it
should not set cpuc->running. Factor out __p4_pmu_enable_event() for
p4_pmu_enable_all().
Suggested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/1618410990-21383-1-git-send-email-kan.liang@linux.intel.com
Diffstat (limited to '')
| -rw-r--r-- | arch/x86/events/perf_event.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h index 53b2b5fc23bc..54a340e42a22 100644 --- a/arch/x86/events/perf_event.h +++ b/arch/x86/events/perf_event.h @@ -228,7 +228,6 @@ struct cpu_hw_events { */ struct perf_event *events[X86_PMC_IDX_MAX]; /* in counter order */ unsigned long active_mask[BITS_TO_LONGS(X86_PMC_IDX_MAX)]; - unsigned long running[BITS_TO_LONGS(X86_PMC_IDX_MAX)]; int enabled; int n_events; /* the # of events in the below arrays */ |