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perf: Better order flexible and pinned scheduling

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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>
This commit is contained in:
Frederic Weisbecker 2010-01-17 12:56:05 +01:00
parent 7defb0f879
commit 329c0e012b
1 changed files with 27 additions and 7 deletions
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34
kernel/perf_event.c
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@ -1362,6 +1362,14 @@ ctx_sched_in(struct perf_event_context *ctx,
raw_spin_unlock(&ctx->lock);
}
static void cpu_ctx_sched_in(struct perf_cpu_context *cpuctx,
enum event_type_t event_type)
{
struct perf_event_context *ctx = &cpuctx->ctx;
ctx_sched_in(ctx, cpuctx, event_type);
}
static void task_ctx_sched_in(struct task_struct *task,
enum event_type_t event_type)
{
@ -1388,15 +1396,27 @@ static void task_ctx_sched_in(struct task_struct *task,
*/
void perf_event_task_sched_in(struct task_struct *task)
{
task_ctx_sched_in(task, EVENT_ALL);
}
struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
struct perf_event_context *ctx = task->perf_event_ctxp;
static void cpu_ctx_sched_in(struct perf_cpu_context *cpuctx,
enum event_type_t event_type)
{
struct perf_event_context *ctx = &cpuctx->ctx;
if (likely(!ctx))
return;
ctx_sched_in(ctx, cpuctx, event_type);
if (cpuctx->task_ctx == ctx)
return;
/*
* We want to keep the following priority order:
* cpu pinned (that don't need to move), task pinned,
* cpu flexible, task flexible.
*/
cpu_ctx_sched_out(cpuctx, EVENT_FLEXIBLE);
ctx_sched_in(ctx, cpuctx, EVENT_PINNED);
cpu_ctx_sched_in(cpuctx, EVENT_FLEXIBLE);
ctx_sched_in(ctx, cpuctx, EVENT_FLEXIBLE);
cpuctx->task_ctx = ctx;
}
#define MAX_INTERRUPTS (~0ULL)