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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2010-10-14 19:57:23 +0400
committerIngo Molnar <mingo@elte.hu>2010-10-18 21:58:58 +0400
commit82cd6def9806dcb6a325fb6abbc1d61388a15f6a (patch)
tree569ce440f8a0619adb8c3791d6b68eecdb2fd29c /include/linux/perf_event.h
parent8b92538d84e50062560ba33adbaed7887b6e4a42 (diff)
downloadlinux-82cd6def9806dcb6a325fb6abbc1d61388a15f6a.tar.xz
perf: Use jump_labels to optimize the scheduler hooks
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>
Diffstat (limited to 'include/linux/perf_event.h')
-rw-r--r--include/linux/perf_event.h27
1 files changed, 25 insertions, 2 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 97965fac55fe..7f0e7f52af8b 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -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);