diff options
author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2012-10-02 15:38:52 +0200 |
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committer | Ingo Molnar <mingo@kernel.org> | 2012-10-05 13:59:06 +0200 |
commit | 3f1f33206c16c7b3839d71372bc2ac3f305aa802 (patch) | |
tree | 683e2af07cb49e9a333f982e72088929027881c1 | |
parent | 2e132b12f78d88672711ae1d87624951de1089ca (diff) | |
download | linux-3f1f33206c16c7b3839d71372bc2ac3f305aa802.tar.bz2 |
perf: Clarify perf_cpu_context::active_pmu usage by renaming it to ::unique_pmu
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>
-rw-r--r-- | include/linux/perf_event.h | 2 | ||||
-rw-r--r-- | kernel/events/core.c | 12 |
2 files changed, 7 insertions, 7 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 599afc4bb67e..b4166cdfa7a2 100644 --- 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; }; diff --git a/kernel/events/core.c b/kernel/events/core.c index 7b9df353ba1b..81939e8999a5 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -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: |