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perf/x86: Use event_base_rdpmc for the RDPMC userspace support

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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
This commit is contained in:
Kan Liang 2020-07-23 10:11:04 -07:00 committed by Peter Zijlstra
parent 9123e3a74e
commit 75608cb02e
1 changed files with 3 additions and 8 deletions
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11
arch/x86/events/core.c
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@ -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,