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| author | Tero Kristo <tero.kristo@linux.intel.com> | 2023-09-12 15:44:31 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2023-10-09 16:12:22 +0200 |
| commit | 05276d4831fe023b6674a72bd6b8c5b39796e690 (patch) | |
| tree | f3b48465fb6506a930ca8071745250263227add1 /arch/x86/events | |
| parent | 38cd5b6a875adc877681faf8e3ad47fdbd6eceb5 (diff) | |
| download | linux-05276d4831fe023b6674a72bd6b8c5b39796e690.tar.gz linux-05276d4831fe023b6674a72bd6b8c5b39796e690.tar.bz2 linux-05276d4831fe023b6674a72bd6b8c5b39796e690.zip | |
perf/x86/cstate: Allow reading the package statistics from local CPU
The MSR registers for reading the package residency counters are
available on every CPU of the package. To avoid doing unnecessary SMP
calls to read the values for these from the various CPUs inside a
package, allow reading them from any CPU of the package.
Suggested-by: Kan Liang <kan.liang@intel.com>
Signed-off-by: Tero Kristo <tero.kristo@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20230912124432.3616761-2-tero.kristo@linux.intel.com
Diffstat (limited to 'arch/x86/events')
| -rw-r--r-- | arch/x86/events/intel/cstate.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/events/intel/cstate.c b/arch/x86/events/intel/cstate.c index 96fffb2d521d..cbeb6d2bf5b4 100644 --- a/arch/x86/events/intel/cstate.c +++ b/arch/x86/events/intel/cstate.c @@ -336,6 +336,9 @@ static int cstate_pmu_event_init(struct perf_event *event) cfg = array_index_nospec((unsigned long)cfg, PERF_CSTATE_PKG_EVENT_MAX); if (!(pkg_msr_mask & (1 << cfg))) return -EINVAL; + + event->event_caps |= PERF_EV_CAP_READ_ACTIVE_PKG; + event->hw.event_base = pkg_msr[cfg].msr; cpu = cpumask_any_and(&cstate_pkg_cpu_mask, topology_die_cpumask(event->cpu)); |