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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2012-10-02 15:38:52 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-10-01 08:55:47 -0700
commit38770b82bdd3523d92596a0807d3751bb7d25224 (patch)
tree2e47888f6dbb26e9127bdd0934ff05b2c928b3ef /kernel
parente129d3e2ecef34372ccf2f2ea0002e0ec72998e8 (diff)
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perf: Clarify perf_cpu_context::active_pmu usage by renaming it to ::unique_pmu
commit 3f1f33206c16c7b3839d71372bc2ac3f305aa802 upstream. 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> Cc: Li Zefan <lizefan@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/events/core.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index a8102d2..a3d53ac 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -4579,7 +4579,7 @@ 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);
@@ -4725,7 +4725,7 @@ 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);
@@ -4921,7 +4921,7 @@ 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);
@@ -5947,8 +5947,8 @@ 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;
}
}
@@ -6080,7 +6080,7 @@ 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: