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perf: Clarify perf_cpu_context::active_pmu usage by renaming it to ::unique_pmu

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Stephane thought the perf_cpu_context::active_pmu name confusing and
suggested using 'unique_pmu' instead.

This pointer is a pointer to a 'random' pmu sharing the cpuctx
instance, therefore limiting a for_each_pmu loop to those where
cpuctx->unique_pmu matches the pmu we get a loop over unique cpuctx
instances.

Suggested-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-kxyjqpfj2fn9gt7kwu5ag9ks@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2012-10-02 15:38:52 +02:00 committed by Ingo Molnar
parent 2e132b12f7
commit 3f1f33206c
2 changed files with 7 additions and 7 deletions
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2
include/linux/perf_event.h
View File

@ -1110,7 +1110,7 @@ struct perf_cpu_context {
int exclusive;
struct list_head rotation_list;
int jiffies_interval;
struct pmu *active_pmu;
struct pmu *unique_pmu;
struct perf_cgroup *cgrp;
};

12
kernel/events/core.c
View File

@ -4419,7 +4419,7 @@ static void perf_event_task_event(struct perf_task_event *task_event)
rcu_read_lock();
list_for_each_entry_rcu(pmu, &pmus, entry) {
cpuctx = get_cpu_ptr(pmu->pmu_cpu_context);
if (cpuctx->active_pmu != pmu)
if (cpuctx->unique_pmu != pmu)
goto next;
perf_event_task_ctx(&cpuctx->ctx, task_event);
@ -4565,7 +4565,7 @@ static void perf_event_comm_event(struct perf_comm_event *comm_event)
rcu_read_lock();
list_for_each_entry_rcu(pmu, &pmus, entry) {
cpuctx = get_cpu_ptr(pmu->pmu_cpu_context);
if (cpuctx->active_pmu != pmu)
if (cpuctx->unique_pmu != pmu)
goto next;
perf_event_comm_ctx(&cpuctx->ctx, comm_event);
@ -4761,7 +4761,7 @@ got_name:
rcu_read_lock();
list_for_each_entry_rcu(pmu, &pmus, entry) {
cpuctx = get_cpu_ptr(pmu->pmu_cpu_context);
if (cpuctx->active_pmu != pmu)
if (cpuctx->unique_pmu != pmu)
goto next;
perf_event_mmap_ctx(&cpuctx->ctx, mmap_event,
vma->vm_flags & VM_EXEC);
@ -5862,8 +5862,8 @@ static void update_pmu_context(struct pmu *pmu, struct pmu *old_pmu)
cpuctx = per_cpu_ptr(pmu->pmu_cpu_context, cpu);
if (cpuctx->active_pmu == old_pmu)
cpuctx->active_pmu = pmu;
if (cpuctx->unique_pmu == old_pmu)
cpuctx->unique_pmu = pmu;
}
}
@ -5998,7 +5998,7 @@ skip_type:
cpuctx->ctx.pmu = pmu;
cpuctx->jiffies_interval = 1;
INIT_LIST_HEAD(&cpuctx->rotation_list);
cpuctx->active_pmu = pmu;
cpuctx->unique_pmu = pmu;
}
got_cpu_context: