diff options
| author | Kan Liang <kan.liang@linux.intel.com> | 2020-07-23 20:11:04 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2020-08-18 17:34:34 +0300 |
| commit | 75608cb02ea5dd997990e2998eca3670cb71a18c (patch) | |
| tree | 480c7c856a88379d9fda9be45461d81e3c9b02da /arch/x86/events | |
| parent | 9123e3a74ec7b934a4a099e98af6a61c2f80bbf5 (diff) | |
| download | linux-75608cb02ea5dd997990e2998eca3670cb71a18c.tar.xz | |
perf/x86: Use event_base_rdpmc for the RDPMC userspace support
The RDPMC index is always re-calculated for the RDPMC userspace support,
which is unnecessary.
The RDPMC index value is stored in the variable event_base_rdpmc for
the kernel usage, which can be used for RDPMC userspace support as well.
Suggested-by: Peter Zijlstra <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/20200723171117.9918-2-kan.liang@linux.intel.com
Diffstat (limited to 'arch/x86/events')
| -rw-r--r-- | arch/x86/events/core.c | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c index 1cbf57dc2ac8..8e108ea378e3 100644 --- a/arch/x86/events/core.c +++ b/arch/x86/events/core.c @@ -2208,17 +2208,12 @@ static void x86_pmu_event_unmapped(struct perf_event *event, struct mm_struct *m static int x86_pmu_event_idx(struct perf_event *event) { - int idx = event->hw.idx; + struct hw_perf_event *hwc = &event->hw; - if (!(event->hw.flags & PERF_X86_EVENT_RDPMC_ALLOWED)) + if (!(hwc->flags & PERF_X86_EVENT_RDPMC_ALLOWED)) return 0; - if (x86_pmu.num_counters_fixed && idx >= INTEL_PMC_IDX_FIXED) { - idx -= INTEL_PMC_IDX_FIXED; - idx |= 1 << 30; - } - - return idx + 1; + return hwc->event_base_rdpmc + 1; } static ssize_t get_attr_rdpmc(struct device *cdev, |