perf: Better order flexible and pinned scheduling
When a task gets scheduled in. We don't touch the cpu bound events so the priority order becomes: cpu pinned, cpu flexible, task pinned, task flexible. So schedule out cpu flexibles when a new task context gets in and correctly order the groups to schedule in: task pinned, cpu flexible, task flexible. Cpu pinned groups don't need to be touched at this time. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
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@ -1362,6 +1362,14 @@ ctx_sched_in(struct perf_event_context *ctx,
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raw_spin_unlock(&ctx->lock);
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}
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static void cpu_ctx_sched_in(struct perf_cpu_context *cpuctx,
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enum event_type_t event_type)
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{
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struct perf_event_context *ctx = &cpuctx->ctx;
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ctx_sched_in(ctx, cpuctx, event_type);
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}
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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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@ -1388,15 +1396,27 @@ 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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task_ctx_sched_in(task, EVENT_ALL);
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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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static void cpu_ctx_sched_in(struct perf_cpu_context *cpuctx,
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enum event_type_t event_type)
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{
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struct perf_event_context *ctx = &cpuctx->ctx;
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if (likely(!ctx))
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return;
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ctx_sched_in(ctx, cpuctx, event_type);
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if (cpuctx->task_ctx == ctx)
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return;
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/*
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* We want to keep the following priority order:
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* cpu pinned (that don't need to move), task pinned,
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* cpu flexible, task flexible.
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*/
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cpu_ctx_sched_out(cpuctx, EVENT_FLEXIBLE);
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ctx_sched_in(ctx, cpuctx, EVENT_PINNED);
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cpu_ctx_sched_in(cpuctx, EVENT_FLEXIBLE);
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ctx_sched_in(ctx, cpuctx, EVENT_FLEXIBLE);
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cpuctx->task_ctx = ctx;
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}
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#define MAX_INTERRUPTS (~0ULL)
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