This is a note to let you know that I've just added the patch titled
perf: Clarify perf_cpu_context::active_pmu usage by renaming
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
perf-clarify-perf_cpu_context-active_pmu-usage-by-renaming.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3f1f33206c16c7b3839d71372bc2ac3f305aa802 Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Date: Tue, 2 Oct 2012 15:38:52 +0200
Subject: perf: Clarify perf_cpu_context::active_pmu usage by renaming
it to ::unique_pmu
From: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-kxyjqpfj2fn9gt7kwu5ag9ks@xxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Li Zefan <lizefan@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -1063,7 +1063,7 @@ 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
@@ -4332,7 +4332,7 @@ 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);
@@ -4478,7 +4478,7 @@ 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);
@@ -4674,7 +4674,7 @@ 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);
@@ -5750,8 +5750,8 @@ 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;
}
}
@@ -5886,7 +5886,7 @@ 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:
Patches currently in stable-queue which might be from a.p.zijlstra@xxxxxxxxx are
queue-3.4/perf-clarify-perf_cpu_context-active_pmu-usage-by-renaming.patch
queue-3.4/perf-fix-perf_cgroup_switch-for-sw-events.patch
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