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Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull perf fixes from Ingo Molnar:
 "A bogus warning fix, a counter width handling fix affecting certain
  machines, plus a oneliner hw-enablement patch for Knights Mill CPUs"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/core: Remove invalid warning from list_update_cgroup_even()t
  perf/x86: Fix full width counter, counter overflow
  perf/x86/intel: Enable C-state residency events for Knights Mill
This commit is contained in:
Linus Torvalds 2016-12-07 11:32:19 -08:00
parent 5b43f97f3f 8fc31ce889
commit bf7f1c7e2f
4 changed files with 11 additions and 13 deletions
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2
arch/x86/events/core.c
View file

@ -69,7 +69,7 @@ u64 x86_perf_event_update(struct perf_event *event)
int shift = 64 - x86_pmu.cntval_bits;
u64 prev_raw_count, new_raw_count;
int idx = hwc->idx;
s64 delta;
u64 delta;
if (idx == INTEL_PMC_IDX_FIXED_BTS)
return 0;

2
arch/x86/events/intel/core.c
View file

@ -4034,7 +4034,7 @@ __init int intel_pmu_init(void)
/* Support full width counters using alternative MSR range */
if (x86_pmu.intel_cap.full_width_write) {
x86_pmu.max_period = x86_pmu.cntval_mask;
x86_pmu.max_period = x86_pmu.cntval_mask >> 1;
x86_pmu.perfctr = MSR_IA32_PMC0;
pr_cont("full-width counters, ");
}

1
arch/x86/events/intel/cstate.c
View file

@ -540,6 +540,7 @@ static const struct x86_cpu_id intel_cstates_match[] __initconst = {
X86_CSTATES_MODEL(INTEL_FAM6_SKYLAKE_DESKTOP, snb_cstates),
X86_CSTATES_MODEL(INTEL_FAM6_XEON_PHI_KNL, knl_cstates),
X86_CSTATES_MODEL(INTEL_FAM6_XEON_PHI_KNM, knl_cstates),
{ },
};
MODULE_DEVICE_TABLE(x86cpu, intel_cstates_match);

19
kernel/events/core.c
View file

@ -903,17 +903,14 @@ list_update_cgroup_event(struct perf_event *event,
*/
cpuctx = __get_cpu_context(ctx);
/* Only set/clear cpuctx->cgrp if current task uses event->cgrp. */
if (perf_cgroup_from_task(current, ctx) != event->cgrp) {
/*
* We are removing the last cpu event in this context.
* If that event is not active in this cpu, cpuctx->cgrp
* should've been cleared by perf_cgroup_switch.
*/
WARN_ON_ONCE(!add && cpuctx->cgrp);
return;
}
cpuctx->cgrp = add ? event->cgrp : NULL;
/*
* cpuctx->cgrp is NULL until a cgroup event is sched in or
* ctx->nr_cgroup == 0 .
*/
if (add && perf_cgroup_from_task(current, ctx) == event->cgrp)
cpuctx->cgrp = event->cgrp;
else if (!add)
cpuctx->cgrp = NULL;
}
#else /* !CONFIG_CGROUP_PERF */