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[PATCH v2 2/2] perf/core: Remove perf_cpu_context::unique_pmu

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cpuctx->unique_pmu was originally introduced as a way to identify cpuctxs
with shared pmus in order to avoid visiting the same cpuctx more than once
in a for_each_pmu loop.

cpuctx->unique_pmu == cpuctx->pmu in non-software task contexts since they
have only one pmu per cpuctx. Since perf_pmu_sched_task is only called in
hw contexts, this patch replaces cpuctx->unique_pmu by cpuctx->pmu in it.

The change above, together with the previous patch in this series, removed
the remaining uses of cpuctx->unique_pmu, so we remove it altogether.

Signed-off-by: David Carrillo-Cisneros <davidcc@google.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
---
 include/linux/perf_event.h |  1 -
 kernel/events/core.c       | 31 +------------------------------
 2 files changed, 1 insertion(+), 31 deletions(-)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 10d223572855..4f8a1f681aac 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -785,7 +785,6 @@ struct perf_cpu_context {
 	ktime_t				hrtimer_interval;
 	unsigned int			hrtimer_active;
 
-	struct pmu			*unique_pmu;
 #ifdef CONFIG_CGROUP_PERF
 	struct perf_cgroup		*cgrp;
 	struct list_head		cgrp_cpuctx_entry;
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 5f5b760bc25b..65b706d25422 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -2883,7 +2883,7 @@ static void perf_pmu_sched_task(struct task_struct *prev,
 		return;
 
 	list_for_each_entry(cpuctx, this_cpu_ptr(&sched_cb_list), sched_cb_entry) {
-		pmu = cpuctx->unique_pmu; /* software PMUs will not have sched_task */
+		pmu = cpuctx->ctx.pmu; /* software PMUs will not have sched_task */
 
 		if (WARN_ON_ONCE(!pmu->sched_task))
 			continue;
@@ -8572,37 +8572,10 @@ static struct perf_cpu_context __percpu *find_pmu_context(int ctxn)
 	return NULL;
 }
 
-static void update_pmu_context(struct pmu *pmu, struct pmu *old_pmu)
-{
-	int cpu;
-
-	for_each_possible_cpu(cpu) {
-		struct perf_cpu_context *cpuctx;
-
-		cpuctx = per_cpu_ptr(pmu->pmu_cpu_context, cpu);
-
-		if (cpuctx->unique_pmu == old_pmu)
-			cpuctx->unique_pmu = pmu;
-	}
-}
-
 static void free_pmu_context(struct pmu *pmu)
 {
-	struct pmu *i;
-
 	mutex_lock(&pmus_lock);
-	/*
-	 * Like a real lame refcount.
-	 */
-	list_for_each_entry(i, &pmus, entry) {
-		if (i->pmu_cpu_context == pmu->pmu_cpu_context) {
-			update_pmu_context(i, pmu);
-			goto out;
-		}
-	}
-
 	free_percpu(pmu->pmu_cpu_context);
-out:
 	mutex_unlock(&pmus_lock);
 }
 
@@ -8806,8 +8779,6 @@ int perf_pmu_register(struct pmu *pmu, const char *name, int type)
 		cpuctx->ctx.pmu = pmu;
 
 		__perf_mux_hrtimer_init(cpuctx, cpu);
-
-		cpuctx->unique_pmu = pmu;
 	}
 
 got_cpu_context:
-- 
2.11.0.483.g087da7b7c-goog

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Thread

[PATCH v2 0/2] Optimize cgroup ctx switch and remove cpuctx->unique_pmu David Carrillo-Cisneros <davidcc@google.com> - 2017-01-18 20:30 +0100
  [PATCH v2 2/2] perf/core: Remove perf_cpu_context::unique_pmu David Carrillo-Cisneros <davidcc@google.com> - 2017-01-18 20:30 +0100
    Re: [PATCH v2 2/2] perf/core: Remove perf_cpu_context::unique_pmu Peter Zijlstra <peterz@infradead.org> - 2017-01-20 13:30 +0100
      Re: [PATCH v2 2/2] perf/core: Remove perf_cpu_context::unique_pmu Mark Rutland <mark.rutland@arm.com> - 2017-01-20 15:30 +0100
      Re: [PATCH v2 2/2] perf/core: Remove perf_cpu_context::unique_pmu David Carrillo-Cisneros <davidcc@google.com> - 2017-01-20 22:50 +0100
    [tip:perf/core] perf/core: Remove perf_cpu_context::unique_pmu tip-bot for David Carrillo-Cisneros <tipbot@zytor.com> - 2017-01-30 13:00 +0100
  [PATCH v2 1/2] perf/core: Make cgroup switch visit only cpuctxs with cgroup events David Carrillo-Cisneros <davidcc@google.com> - 2017-01-18 20:30 +0100
    [tip:perf/core] perf/core: Make cgroup switch visit only cpuctxs  with cgroup events tip-bot for David Carrillo-Cisneros <tipbot@zytor.com> - 2017-01-30 13:00 +0100

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