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perf: Use jump_labels to optimize the scheduler hooks

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Trades a call + conditional + ret for an unconditional jmp.

Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20101014203625.501657727@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2010-10-14 17:57:23 +02:00
committed by Ingo Molnar
parent 8b92538d84
commit 82cd6def98
2 changed files with 34 additions and 17 deletions
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27
include/linux/perf_event.h
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@@ -487,6 +487,7 @@ struct perf_guest_info_callbacks {
#include <linux/ftrace.h>
#include <linux/cpu.h>
#include <linux/irq_work.h>
#include <linux/jump_label_ref.h>
#include <asm/atomic.h>
#include <asm/local.h>
@@ -895,8 +896,30 @@ extern void perf_pmu_unregister(struct pmu *pmu);
extern int perf_num_counters(void);
extern const char *perf_pmu_name(void);
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_sched_in(struct task_struct *task);
extern void __perf_event_task_sched_out(struct task_struct *task, struct task_struct *next);
extern atomic_t perf_task_events;
static inline void perf_event_task_sched_in(struct task_struct *task)
{
JUMP_LABEL(&perf_task_events, have_events);
return;
have_events:
__perf_event_task_sched_in(task);
}
static inline
void perf_event_task_sched_out(struct task_struct *task, struct task_struct *next)
{
JUMP_LABEL(&perf_task_events, have_events);
return;
have_events:
__perf_event_task_sched_out(task, next);
}
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);