On Tue, 2012-10-02 at 15:34 +0200, Stephane Eranian wrote:
> > If you've got a good suggestion I'd be glad to rename it.
>
> how about unique_pmu?
Done!
---
Subject: perf: Clarify perf_cpu_context::active_pmu by renaming it
From: Peter Zijlstra <a.p.zijls...@chello.nl>
Date: Tue Oct 02 15:38:52 CEST 2012
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 <eran...@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijls...@chello.nl>
---
include/linux/perf_event.h | 2 +-
kernel/events/core.c | 12 ++++++------
2 files changed, 7 insertions(+), 7 deletions(-)
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -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;
};
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -4419,7 +4419,7 @@ static void perf_event_task_event(struct
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
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 @@ static void perf_event_mmap_event(struct
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 pm
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 @@ int perf_pmu_register(struct pmu *pmu, c
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:
--
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