perf: Per-pmu-per-cpu contexts
Allocate per-cpu contexts per pmu. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: paulus <paulus@samba.org> Cc: stephane eranian <eranian@googlemail.com> Cc: Robert Richter <robert.richter@amd.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Lin Ming <ming.m.lin@intel.com> Cc: Yanmin <yanmin_zhang@linux.intel.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
Ingo Molnar
Родитель
b5ab4cd563
Коммит
108b02cfce
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@ -570,7 +570,8 @@ struct perf_event;
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struct pmu {
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struct list_head entry;
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int *pmu_disable_count;
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int * __percpu pmu_disable_count;
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struct perf_cpu_context * __percpu pmu_cpu_context;
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/*
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* Fully disable/enable this PMU, can be used to protect from the PMI
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@ -808,6 +809,7 @@ struct perf_event {
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* Used as a container for task events and CPU events as well:
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*/
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struct perf_event_context {
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struct pmu *pmu;
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/*
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* Protect the states of the events in the list,
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* nr_active, and the list:
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@ -34,16 +34,15 @@
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#include <asm/irq_regs.h>
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/*
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* Each CPU has a list of per CPU events:
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*/
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static DEFINE_PER_CPU(struct perf_cpu_context, perf_cpu_context);
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static atomic_t nr_events __read_mostly;
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static atomic_t nr_mmap_events __read_mostly;
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static atomic_t nr_comm_events __read_mostly;
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static atomic_t nr_task_events __read_mostly;
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static LIST_HEAD(pmus);
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static DEFINE_MUTEX(pmus_lock);
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static struct srcu_struct pmus_srcu;
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/*
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* perf event paranoia level:
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* -1 - not paranoid at all
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@ -78,9 +77,9 @@ void perf_pmu_enable(struct pmu *pmu)
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pmu->pmu_enable(pmu);
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}
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static void perf_pmu_rotate_start(void)
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static void perf_pmu_rotate_start(struct pmu *pmu)
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{
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struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
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struct perf_cpu_context *cpuctx = this_cpu_ptr(pmu->pmu_cpu_context);
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if (hrtimer_active(&cpuctx->timer))
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return;
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@ -90,9 +89,9 @@ static void perf_pmu_rotate_start(void)
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HRTIMER_MODE_REL_PINNED, 0);
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}
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static void perf_pmu_rotate_stop(void)
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static void perf_pmu_rotate_stop(struct pmu *pmu)
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{
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struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
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struct perf_cpu_context *cpuctx = this_cpu_ptr(pmu->pmu_cpu_context);
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hrtimer_cancel(&cpuctx->timer);
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}
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@ -301,7 +300,7 @@ list_add_event(struct perf_event *event, struct perf_event_context *ctx)
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list_add_rcu(&event->event_entry, &ctx->event_list);
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if (!ctx->nr_events)
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perf_pmu_rotate_start();
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perf_pmu_rotate_start(ctx->pmu);
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ctx->nr_events++;
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if (event->attr.inherit_stat)
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ctx->nr_stat++;
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@ -466,6 +465,12 @@ group_sched_out(struct perf_event *group_event,
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cpuctx->exclusive = 0;
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}
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static inline struct perf_cpu_context *
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__get_cpu_context(struct perf_event_context *ctx)
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{
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return this_cpu_ptr(ctx->pmu->pmu_cpu_context);
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}
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/*
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* Cross CPU call to remove a performance event
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*
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@ -474,9 +479,9 @@ group_sched_out(struct perf_event *group_event,
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*/
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static void __perf_event_remove_from_context(void *info)
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{
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struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
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struct perf_event *event = info;
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struct perf_event_context *ctx = event->ctx;
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struct perf_cpu_context *cpuctx = __get_cpu_context(ctx);
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/*
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* If this is a task context, we need to check whether it is
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@ -556,8 +561,8 @@ retry:
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static void __perf_event_disable(void *info)
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{
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struct perf_event *event = info;
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struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
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struct perf_event_context *ctx = event->ctx;
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struct perf_cpu_context *cpuctx = __get_cpu_context(ctx);
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/*
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* If this is a per-task event, need to check whether this
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@ -765,10 +770,10 @@ static void add_event_to_ctx(struct perf_event *event,
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*/
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static void __perf_install_in_context(void *info)
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{
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struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
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struct perf_event *event = info;
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struct perf_event_context *ctx = event->ctx;
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struct perf_event *leader = event->group_leader;
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struct perf_cpu_context *cpuctx = __get_cpu_context(ctx);
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int err;
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/*
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@ -912,9 +917,9 @@ static void __perf_event_mark_enabled(struct perf_event *event,
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static void __perf_event_enable(void *info)
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{
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struct perf_event *event = info;
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struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
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struct perf_event_context *ctx = event->ctx;
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struct perf_event *leader = event->group_leader;
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struct perf_cpu_context *cpuctx = __get_cpu_context(ctx);
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int err;
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/*
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@ -1188,15 +1193,19 @@ static void perf_event_sync_stat(struct perf_event_context *ctx,
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void perf_event_task_sched_out(struct task_struct *task,
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struct task_struct *next)
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{
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struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
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struct perf_event_context *ctx = task->perf_event_ctxp;
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struct perf_event_context *next_ctx;
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struct perf_event_context *parent;
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struct perf_cpu_context *cpuctx;
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int do_switch = 1;
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perf_sw_event(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, 1, NULL, 0);
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if (likely(!ctx || !cpuctx->task_ctx))
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if (likely(!ctx))
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return;
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cpuctx = __get_cpu_context(ctx);
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if (!cpuctx->task_ctx)
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return;
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rcu_read_lock();
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@ -1242,7 +1251,7 @@ void perf_event_task_sched_out(struct task_struct *task,
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static void task_ctx_sched_out(struct perf_event_context *ctx,
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enum event_type_t event_type)
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{
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struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
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struct perf_cpu_context *cpuctx = __get_cpu_context(ctx);
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if (!cpuctx->task_ctx)
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return;
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@ -1360,8 +1369,8 @@ static void cpu_ctx_sched_in(struct perf_cpu_context *cpuctx,
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static void task_ctx_sched_in(struct task_struct *task,
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enum event_type_t event_type)
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{
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struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
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struct perf_event_context *ctx = task->perf_event_ctxp;
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struct perf_cpu_context *cpuctx = __get_cpu_context(ctx);
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if (likely(!ctx))
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return;
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@ -1383,12 +1392,13 @@ static void task_ctx_sched_in(struct task_struct *task,
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*/
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void perf_event_task_sched_in(struct task_struct *task)
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{
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struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
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struct perf_event_context *ctx = task->perf_event_ctxp;
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struct perf_cpu_context *cpuctx;
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if (likely(!ctx))
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return;
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cpuctx = __get_cpu_context(ctx);
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if (cpuctx->task_ctx == ctx)
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return;
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@ -1409,7 +1419,7 @@ void perf_event_task_sched_in(struct task_struct *task)
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* Since these rotations are per-cpu, we need to ensure the
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* cpu-context we got scheduled on is actually rotating.
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*/
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perf_pmu_rotate_start();
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perf_pmu_rotate_start(ctx->pmu);
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}
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#define MAX_INTERRUPTS (~0ULL)
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@ -1687,9 +1697,9 @@ out:
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*/
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static void __perf_event_read(void *info)
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{
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struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
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struct perf_event *event = info;
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struct perf_event_context *ctx = event->ctx;
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struct perf_cpu_context *cpuctx = __get_cpu_context(ctx);
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/*
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* If this is a task context, we need to check whether it is
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@ -1962,7 +1972,8 @@ __perf_event_init_context(struct perf_event_context *ctx,
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ctx->task = task;
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}
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static struct perf_event_context *find_get_context(pid_t pid, int cpu)
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static struct perf_event_context *
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find_get_context(struct pmu *pmu, pid_t pid, int cpu)
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{
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struct perf_event_context *ctx;
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struct perf_cpu_context *cpuctx;
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@ -1986,7 +1997,7 @@ static struct perf_event_context *find_get_context(pid_t pid, int cpu)
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if (!cpu_online(cpu))
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return ERR_PTR(-ENODEV);
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cpuctx = &per_cpu(perf_cpu_context, cpu);
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cpuctx = per_cpu_ptr(pmu->pmu_cpu_context, cpu);
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ctx = &cpuctx->ctx;
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get_ctx(ctx);
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@ -2030,6 +2041,7 @@ retry:
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if (!ctx)
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goto errout;
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__perf_event_init_context(ctx, task);
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ctx->pmu = pmu;
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get_ctx(ctx);
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if (cmpxchg(&task->perf_event_ctxp, NULL, ctx)) {
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/*
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@ -3745,18 +3757,20 @@ static void perf_event_task_ctx(struct perf_event_context *ctx,
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static void perf_event_task_event(struct perf_task_event *task_event)
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{
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struct perf_cpu_context *cpuctx;
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struct perf_event_context *ctx = task_event->task_ctx;
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struct perf_cpu_context *cpuctx;
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struct pmu *pmu;
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rcu_read_lock();
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cpuctx = &get_cpu_var(perf_cpu_context);
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perf_event_task_ctx(&cpuctx->ctx, task_event);
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rcu_read_lock_sched();
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list_for_each_entry_rcu(pmu, &pmus, entry) {
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cpuctx = this_cpu_ptr(pmu->pmu_cpu_context);
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perf_event_task_ctx(&cpuctx->ctx, task_event);
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}
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if (!ctx)
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ctx = rcu_dereference(current->perf_event_ctxp);
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if (ctx)
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perf_event_task_ctx(ctx, task_event);
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put_cpu_var(perf_cpu_context);
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rcu_read_unlock();
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rcu_read_unlock_sched();
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}
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static void perf_event_task(struct task_struct *task,
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@ -3861,6 +3875,7 @@ static void perf_event_comm_event(struct perf_comm_event *comm_event)
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struct perf_cpu_context *cpuctx;
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struct perf_event_context *ctx;
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unsigned int size;
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struct pmu *pmu;
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char comm[TASK_COMM_LEN];
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memset(comm, 0, sizeof(comm));
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@ -3872,14 +3887,15 @@ static void perf_event_comm_event(struct perf_comm_event *comm_event)
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comm_event->event_id.header.size = sizeof(comm_event->event_id) + size;
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rcu_read_lock();
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cpuctx = &get_cpu_var(perf_cpu_context);
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perf_event_comm_ctx(&cpuctx->ctx, comm_event);
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rcu_read_lock_sched();
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list_for_each_entry_rcu(pmu, &pmus, entry) {
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cpuctx = this_cpu_ptr(pmu->pmu_cpu_context);
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perf_event_comm_ctx(&cpuctx->ctx, comm_event);
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}
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ctx = rcu_dereference(current->perf_event_ctxp);
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if (ctx)
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perf_event_comm_ctx(ctx, comm_event);
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put_cpu_var(perf_cpu_context);
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rcu_read_unlock();
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rcu_read_unlock_sched();
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}
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void perf_event_comm(struct task_struct *task)
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@ -3989,6 +4005,7 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event)
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char tmp[16];
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char *buf = NULL;
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const char *name;
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struct pmu *pmu;
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memset(tmp, 0, sizeof(tmp));
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@ -4040,14 +4057,16 @@ got_name:
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mmap_event->event_id.header.size = sizeof(mmap_event->event_id) + size;
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rcu_read_lock();
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cpuctx = &get_cpu_var(perf_cpu_context);
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perf_event_mmap_ctx(&cpuctx->ctx, mmap_event, vma->vm_flags & VM_EXEC);
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rcu_read_lock_sched();
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list_for_each_entry_rcu(pmu, &pmus, entry) {
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cpuctx = this_cpu_ptr(pmu->pmu_cpu_context);
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perf_event_mmap_ctx(&cpuctx->ctx, mmap_event,
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vma->vm_flags & VM_EXEC);
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}
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ctx = rcu_dereference(current->perf_event_ctxp);
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if (ctx)
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perf_event_mmap_ctx(ctx, mmap_event, vma->vm_flags & VM_EXEC);
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put_cpu_var(perf_cpu_context);
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rcu_read_unlock();
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rcu_read_unlock_sched();
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kfree(buf);
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}
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@ -4982,10 +5001,6 @@ static struct pmu perf_task_clock = {
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.read = task_clock_event_read,
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};
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static LIST_HEAD(pmus);
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static DEFINE_MUTEX(pmus_lock);
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static struct srcu_struct pmus_srcu;
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static void perf_pmu_nop_void(struct pmu *pmu)
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{
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}
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@ -5013,7 +5028,7 @@ static void perf_pmu_cancel_txn(struct pmu *pmu)
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int perf_pmu_register(struct pmu *pmu)
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{
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int ret;
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int cpu, ret;
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mutex_lock(&pmus_lock);
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ret = -ENOMEM;
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@ -5021,6 +5036,21 @@ int perf_pmu_register(struct pmu *pmu)
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if (!pmu->pmu_disable_count)
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goto unlock;
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pmu->pmu_cpu_context = alloc_percpu(struct perf_cpu_context);
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if (!pmu->pmu_cpu_context)
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goto free_pdc;
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for_each_possible_cpu(cpu) {
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struct perf_cpu_context *cpuctx;
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cpuctx = per_cpu_ptr(pmu->pmu_cpu_context, cpu);
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__perf_event_init_context(&cpuctx->ctx, NULL);
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cpuctx->ctx.pmu = pmu;
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cpuctx->timer_interval = TICK_NSEC;
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hrtimer_init(&cpuctx->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
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cpuctx->timer.function = perf_event_context_tick;
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}
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if (!pmu->start_txn) {
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if (pmu->pmu_enable) {
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/*
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@ -5049,6 +5079,10 @@ unlock:
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mutex_unlock(&pmus_lock);
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return ret;
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free_pdc:
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free_percpu(pmu->pmu_disable_count);
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goto unlock;
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}
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void perf_pmu_unregister(struct pmu *pmu)
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@ -5057,9 +5091,14 @@ void perf_pmu_unregister(struct pmu *pmu)
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list_del_rcu(&pmu->entry);
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mutex_unlock(&pmus_lock);
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/*
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* We use the pmu list either under SRCU or preempt_disable,
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* synchronize_srcu() implies synchronize_sched() so we're good.
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*/
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synchronize_srcu(&pmus_srcu);
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free_percpu(pmu->pmu_disable_count);
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free_percpu(pmu->pmu_cpu_context);
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}
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struct pmu *perf_init_event(struct perf_event *event)
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@ -5374,7 +5413,7 @@ SYSCALL_DEFINE5(perf_event_open,
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/*
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* Get the target context (task or percpu):
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*/
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ctx = find_get_context(pid, cpu);
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ctx = find_get_context(event->pmu, pid, cpu);
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if (IS_ERR(ctx)) {
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err = PTR_ERR(ctx);
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goto err_alloc;
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|
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@ -5489,7 +5528,7 @@ perf_event_create_kernel_counter(struct perf_event_attr *attr, int cpu,
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goto err;
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}
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ctx = find_get_context(pid, cpu);
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ctx = find_get_context(event->pmu, pid, cpu);
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if (IS_ERR(ctx)) {
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err = PTR_ERR(ctx);
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goto err_free;
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@ -5833,6 +5872,7 @@ inherit_task_group(struct perf_event *event, struct task_struct *parent,
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return -ENOMEM;
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__perf_event_init_context(child_ctx, child);
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child_ctx->pmu = event->pmu;
|
||||
child->perf_event_ctxp = child_ctx;
|
||||
get_task_struct(child);
|
||||
}
|
||||
|
|
@ -5935,30 +5975,18 @@ int perf_event_init_task(struct task_struct *child)
|
|||
|
||||
static void __init perf_event_init_all_cpus(void)
|
||||
{
|
||||
struct perf_cpu_context *cpuctx;
|
||||
struct swevent_htable *swhash;
|
||||
int cpu;
|
||||
|
||||
for_each_possible_cpu(cpu) {
|
||||
swhash = &per_cpu(swevent_htable, cpu);
|
||||
mutex_init(&swhash->hlist_mutex);
|
||||
|
||||
cpuctx = &per_cpu(perf_cpu_context, cpu);
|
||||
__perf_event_init_context(&cpuctx->ctx, NULL);
|
||||
cpuctx->timer_interval = TICK_NSEC;
|
||||
hrtimer_init(&cpuctx->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
|
||||
cpuctx->timer.function = perf_event_context_tick;
|
||||
}
|
||||
}
|
||||
|
||||
static void __cpuinit perf_event_init_cpu(int cpu)
|
||||
{
|
||||
struct perf_cpu_context *cpuctx;
|
||||
struct swevent_htable *swhash;
|
||||
|
||||
cpuctx = &per_cpu(perf_cpu_context, cpu);
|
||||
|
||||
swhash = &per_cpu(swevent_htable, cpu);
|
||||
struct swevent_htable *swhash = &per_cpu(swevent_htable, cpu);
|
||||
|
||||
mutex_lock(&swhash->hlist_mutex);
|
||||
if (swhash->hlist_refcount > 0) {
|
||||
|
|
@ -5972,32 +6000,46 @@ static void __cpuinit perf_event_init_cpu(int cpu)
|
|||
}
|
||||
|
||||
#ifdef CONFIG_HOTPLUG_CPU
|
||||
static void __perf_event_exit_cpu(void *info)
|
||||
static void __perf_event_exit_context(void *__info)
|
||||
{
|
||||
struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
|
||||
struct perf_event_context *ctx = &cpuctx->ctx;
|
||||
struct perf_event_context *ctx = __info;
|
||||
struct perf_event *event, *tmp;
|
||||
|
||||
perf_pmu_rotate_stop();
|
||||
perf_pmu_rotate_stop(ctx->pmu);
|
||||
|
||||
list_for_each_entry_safe(event, tmp, &ctx->pinned_groups, group_entry)
|
||||
__perf_event_remove_from_context(event);
|
||||
list_for_each_entry_safe(event, tmp, &ctx->flexible_groups, group_entry)
|
||||
__perf_event_remove_from_context(event);
|
||||
}
|
||||
|
||||
static void perf_event_exit_cpu_context(int cpu)
|
||||
{
|
||||
struct perf_event_context *ctx;
|
||||
struct pmu *pmu;
|
||||
int idx;
|
||||
|
||||
idx = srcu_read_lock(&pmus_srcu);
|
||||
list_for_each_entry_rcu(pmu, &pmus, entry) {
|
||||
ctx = &this_cpu_ptr(pmu->pmu_cpu_context)->ctx;
|
||||
|
||||
mutex_lock(&ctx->mutex);
|
||||
smp_call_function_single(cpu, __perf_event_exit_context, ctx, 1);
|
||||
mutex_unlock(&ctx->mutex);
|
||||
}
|
||||
srcu_read_unlock(&pmus_srcu, idx);
|
||||
|
||||
}
|
||||
|
||||
static void perf_event_exit_cpu(int cpu)
|
||||
{
|
||||
struct perf_cpu_context *cpuctx = &per_cpu(perf_cpu_context, cpu);
|
||||
struct swevent_htable *swhash = &per_cpu(swevent_htable, cpu);
|
||||
struct perf_event_context *ctx = &cpuctx->ctx;
|
||||
|
||||
mutex_lock(&swhash->hlist_mutex);
|
||||
swevent_hlist_release(swhash);
|
||||
mutex_unlock(&swhash->hlist_mutex);
|
||||
|
||||
mutex_lock(&ctx->mutex);
|
||||
smp_call_function_single(cpu, __perf_event_exit_cpu, NULL, 1);
|
||||
mutex_unlock(&ctx->mutex);
|
||||
perf_event_exit_cpu_context(cpu);
|
||||
}
|
||||
#else
|
||||
static inline void perf_event_exit_cpu(int cpu) { }
|
||||
|
|
|
|||
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Ссылка в новой задаче