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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2010-10-14 17:57:23 +0200
committerIngo Molnar <mingo@elte.hu>2010-10-18 19:58:58 +0200
commit82cd6def9806dcb6a325fb6abbc1d61388a15f6a (patch)
tree569ce440f8a0619adb8c3791d6b68eecdb2fd29c /kernel
parent8b92538d84e50062560ba33adbaed7887b6e4a42 (diff)
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 'kernel')
-rw-r--r--kernel/perf_event.c24
1 files changed, 9 insertions, 15 deletions
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 856e20baf13f..f7febb02ab97 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -34,7 +34,7 @@
#include <asm/irq_regs.h>
-static atomic_t nr_events __read_mostly;
+atomic_t perf_task_events __read_mostly;
static atomic_t nr_mmap_events __read_mostly;
static atomic_t nr_comm_events __read_mostly;
static atomic_t nr_task_events __read_mostly;
@@ -1311,8 +1311,8 @@ void perf_event_context_sched_out(struct task_struct *task, int ctxn,
* accessing the event control register. If a NMI hits, then it will
* not restart the event.
*/
-void perf_event_task_sched_out(struct task_struct *task,
- struct task_struct *next)
+void __perf_event_task_sched_out(struct task_struct *task,
+ struct task_struct *next)
{
int ctxn;
@@ -1340,14 +1340,6 @@ static void task_ctx_sched_out(struct perf_event_context *ctx,
/*
* Called with IRQs disabled
*/
-static void __perf_event_task_sched_out(struct perf_event_context *ctx)
-{
- task_ctx_sched_out(ctx, EVENT_ALL);
-}
-
-/*
- * Called with IRQs disabled
- */
static void cpu_ctx_sched_out(struct perf_cpu_context *cpuctx,
enum event_type_t event_type)
{
@@ -1494,7 +1486,7 @@ void perf_event_context_sched_in(struct perf_event_context *ctx)
* accessing the event control register. If a NMI hits, then it will
* keep the event running.
*/
-void perf_event_task_sched_in(struct task_struct *task)
+void __perf_event_task_sched_in(struct task_struct *task)
{
struct perf_event_context *ctx;
int ctxn;
@@ -2216,7 +2208,8 @@ static void free_event(struct perf_event *event)
irq_work_sync(&event->pending);
if (!event->parent) {
- atomic_dec(&nr_events);
+ if (event->attach_state & PERF_ATTACH_TASK)
+ jump_label_dec(&perf_task_events);
if (event->attr.mmap || event->attr.mmap_data)
atomic_dec(&nr_mmap_events);
if (event->attr.comm)
@@ -5354,7 +5347,8 @@ done:
event->pmu = pmu;
if (!event->parent) {
- atomic_inc(&nr_events);
+ if (event->attach_state & PERF_ATTACH_TASK)
+ jump_label_inc(&perf_task_events);
if (event->attr.mmap || event->attr.mmap_data)
atomic_inc(&nr_mmap_events);
if (event->attr.comm)
@@ -5849,7 +5843,7 @@ static void perf_event_exit_task_context(struct task_struct *child, int ctxn)
* our context.
*/
child_ctx = child->perf_event_ctxp[ctxn];
- __perf_event_task_sched_out(child_ctx);
+ task_ctx_sched_out(child_ctx, EVENT_ALL);
/*
* Take the context lock here so that if find_get_context is