perf: Per cpu-context rotation timer

Give each cpu-context its own timer so that it is a self contained
entity, this eases the way for per-pmu-per-cpu contexts as well as
provides the basic infrastructure to allow different rotation
times per pmu.

Things to look at:
 - folding the tick and these TICK_NSEC timers
 - separate task context rotation

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>

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 4ab4f0c..fa04537 100644 (file)
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -861,6 +861,8 @@ struct perf_cpu_context {
        struct perf_event_context       *task_ctx;
        int                             active_oncpu;
        int                             exclusive;
+       u64                             timer_interval;
+       struct hrtimer                  timer;
 };
 
 struct perf_output_handle {
@@ -881,7 +883,6 @@ extern void perf_pmu_unregister(struct pmu *pmu);
 
 extern void perf_event_task_sched_in(struct task_struct *task);
 extern void perf_event_task_sched_out(struct task_struct *task, struct task_struct *next);
-extern void perf_event_task_tick(struct task_struct *task);
 extern int perf_event_init_task(struct task_struct *child);
 extern void perf_event_exit_task(struct task_struct *child);
 extern void perf_event_free_task(struct task_struct *task);
@@ -1067,8 +1068,6 @@ perf_event_task_sched_in(struct task_struct *task)                        { }
 static inline void
 perf_event_task_sched_out(struct task_struct *task,
                            struct task_struct *next)                   { }
-static inline void
-perf_event_task_tick(struct task_struct *task)                         { }
 static inline int perf_event_init_task(struct task_struct *child)      { return 0; }
 static inline void perf_event_exit_task(struct task_struct *child)     { }
 static inline void perf_event_free_task(struct task_struct *task)      { }

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 2c47ed6..d75e4c8 100644 (file)
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -78,6 +78,25 @@ void perf_pmu_enable(struct pmu *pmu)
                pmu->pmu_enable(pmu);
 }
 
+static void perf_pmu_rotate_start(void)
+{
+       struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
+
+       if (hrtimer_active(&cpuctx->timer))
+               return;
+
+       __hrtimer_start_range_ns(&cpuctx->timer,
+                       ns_to_ktime(cpuctx->timer_interval), 0,
+                       HRTIMER_MODE_REL_PINNED, 0);
+}
+
+static void perf_pmu_rotate_stop(void)
+{
+       struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
+
+       hrtimer_cancel(&cpuctx->timer);
+}
+
 static void get_ctx(struct perf_event_context *ctx)
 {
        WARN_ON(!atomic_inc_not_zero(&ctx->refcount));
@@ -281,6 +300,8 @@ list_add_event(struct perf_event *event, struct perf_event_context *ctx)
        }
 
        list_add_rcu(&event->event_entry, &ctx->event_list);
+       if (!ctx->nr_events)
+               perf_pmu_rotate_start();
        ctx->nr_events++;
        if (event->attr.inherit_stat)
                ctx->nr_stat++;
@@ -1383,6 +1404,12 @@ void perf_event_task_sched_in(struct task_struct *task)
        ctx_sched_in(ctx, cpuctx, EVENT_FLEXIBLE);
 
        cpuctx->task_ctx = ctx;
+
+       /*
+        * Since these rotations are per-cpu, we need to ensure the
+        * cpu-context we got scheduled on is actually rotating.
+        */
+       perf_pmu_rotate_start();
 }
 
 #define MAX_INTERRUPTS (~0ULL)
@@ -1487,7 +1514,7 @@ static void perf_adjust_period(struct perf_event *event, u64 nsec, u64 count)
        }
 }
 
-static void perf_ctx_adjust_freq(struct perf_event_context *ctx)
+static void perf_ctx_adjust_freq(struct perf_event_context *ctx, u64 period)
 {
        struct perf_event *event;
        struct hw_perf_event *hwc;
@@ -1524,7 +1551,7 @@ static void perf_ctx_adjust_freq(struct perf_event_context *ctx)
                hwc->freq_count_stamp = now;
 
                if (delta > 0)
-                       perf_adjust_period(event, TICK_NSEC, delta);
+                       perf_adjust_period(event, period, delta);
        }
        raw_spin_unlock(&ctx->lock);
 }
@@ -1542,30 +1569,39 @@ static void rotate_ctx(struct perf_event_context *ctx)
        raw_spin_unlock(&ctx->lock);
 }
 
-void perf_event_task_tick(struct task_struct *curr)
+/*
+ * Cannot race with ->pmu_rotate_start() because this is ran from hardirq
+ * context, and ->pmu_rotate_start() is called with irqs disabled (both are
+ * cpu affine, so there are no SMP races).
+ */
+static enum hrtimer_restart perf_event_context_tick(struct hrtimer *timer)
 {
+       enum hrtimer_restart restart = HRTIMER_NORESTART;
        struct perf_cpu_context *cpuctx;
        struct perf_event_context *ctx;
        int rotate = 0;
 
-       if (!atomic_read(&nr_events))
-               return;
+       cpuctx = container_of(timer, struct perf_cpu_context, timer);
 
-       cpuctx = &__get_cpu_var(perf_cpu_context);
-       if (cpuctx->ctx.nr_events &&
-           cpuctx->ctx.nr_events != cpuctx->ctx.nr_active)
-               rotate = 1;
+       if (cpuctx->ctx.nr_events) {
+               restart = HRTIMER_RESTART;
+               if (cpuctx->ctx.nr_events != cpuctx->ctx.nr_active)
+                       rotate = 1;
+       }
 
-       ctx = curr->perf_event_ctxp;
-       if (ctx && ctx->nr_events && ctx->nr_events != ctx->nr_active)
-               rotate = 1;
+       ctx = current->perf_event_ctxp;
+       if (ctx && ctx->nr_events) {
+               restart = HRTIMER_RESTART;
+               if (ctx->nr_events != ctx->nr_active)
+                       rotate = 1;
+       }
 
-       perf_ctx_adjust_freq(&cpuctx->ctx);
+       perf_ctx_adjust_freq(&cpuctx->ctx, cpuctx->timer_interval);
        if (ctx)
-               perf_ctx_adjust_freq(ctx);
+               perf_ctx_adjust_freq(ctx, cpuctx->timer_interval);
 
        if (!rotate)
-               return;
+               goto done;
 
        cpu_ctx_sched_out(cpuctx, EVENT_FLEXIBLE);
        if (ctx)
@@ -1577,7 +1613,12 @@ void perf_event_task_tick(struct task_struct *curr)
 
        cpu_ctx_sched_in(cpuctx, EVENT_FLEXIBLE);
        if (ctx)
-               task_ctx_sched_in(curr, EVENT_FLEXIBLE);
+               task_ctx_sched_in(current, EVENT_FLEXIBLE);
+
+done:
+       hrtimer_forward_now(timer, ns_to_ktime(cpuctx->timer_interval));
+
+       return restart;
 }
 
 static int event_enable_on_exec(struct perf_event *event,
@@ -4786,7 +4827,7 @@ static void perf_swevent_start_hrtimer(struct perf_event *event)
                }
                __hrtimer_start_range_ns(&hwc->hrtimer,
                                ns_to_ktime(period), 0,
-                               HRTIMER_MODE_REL, 0);
+                               HRTIMER_MODE_REL_PINNED, 0);
        }
 }
 
@@ -5904,6 +5945,9 @@ static void __init perf_event_init_all_cpus(void)
 
                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;
        }
 }
 
@@ -5934,6 +5978,8 @@ static void __perf_event_exit_cpu(void *info)
        struct perf_event_context *ctx = &cpuctx->ctx;
        struct perf_event *event, *tmp;
 
+       perf_pmu_rotate_stop();
+
        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)

diff --git a/kernel/sched.c b/kernel/sched.c
index 09b574e..66a02ba 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3578,8 +3578,6 @@ void scheduler_tick(void)
        curr->sched_class->task_tick(rq, curr, 0);
        raw_spin_unlock(&rq->lock);
 
-       perf_event_task_tick(curr);
-
 #ifdef CONFIG_SMP
        rq->idle_at_tick = idle_cpu(cpu);
        trigger_load_balance(rq, cpu);