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Date: Fri, 20 Mar 2009 10:24:59 GMT
From: Peter Zijlstra <a.p.zijlstra@...llo.nl>
To: linux-tip-commits@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, paulus@...ba.org, hpa@...or.com,
mingo@...hat.com, rostedt@...dmis.org, a.p.zijlstra@...llo.nl,
tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perfcounters/core] perf_counter: generic context switch event
Commit-ID: 56675f6a68ace46db70af12bdd39b6103cc54929
Gitweb: http://git.kernel.org/tip/56675f6a68ace46db70af12bdd39b6103cc54929
Author: Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Thu, 19 Mar 2009 20:26:12 +0100
Committer: Ingo Molnar <mingo@...e.hu>
CommitDate: Fri, 20 Mar 2009 11:15:11 +0100
perf_counter: generic context switch event
Impact: cleanup
Use the generic software events for context switches.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
LKML-Reference: <20090319194233.283522645@...llo.nl>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
include/linux/sched.h | 1 -
kernel/perf_counter.c | 60 +++---------------------------------------------
kernel/sched.c | 6 -----
3 files changed, 4 insertions(+), 63 deletions(-)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 3e9bb18..1410859 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -137,7 +137,6 @@ extern unsigned long nr_running(void);
extern unsigned long nr_uninterruptible(void);
extern unsigned long nr_active(void);
extern unsigned long nr_iowait(void);
-extern u64 cpu_nr_switches(int cpu);
extern u64 cpu_nr_migrations(int cpu);
extern unsigned long get_parent_ip(unsigned long addr);
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index 4c4e9eb..99d5930 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -710,10 +710,13 @@ void perf_counter_task_sched_out(struct task_struct *task, int cpu)
{
struct perf_cpu_context *cpuctx = &per_cpu(perf_cpu_context, cpu);
struct perf_counter_context *ctx = &task->perf_counter_ctx;
+ struct pt_regs *regs;
if (likely(!cpuctx->task_ctx))
return;
+ regs = task_pt_regs(task);
+ perf_swcounter_event(PERF_COUNT_CONTEXT_SWITCHES, 1, 1, regs);
__perf_counter_sched_out(ctx, cpuctx);
cpuctx->task_ctx = NULL;
@@ -1668,58 +1671,6 @@ static const struct hw_perf_counter_ops perf_ops_task_clock = {
};
/*
- * Software counter: context switches
- */
-
-static u64 get_context_switches(struct perf_counter *counter)
-{
- struct task_struct *curr = counter->ctx->task;
-
- if (curr)
- return curr->nvcsw + curr->nivcsw;
- return cpu_nr_switches(smp_processor_id());
-}
-
-static void context_switches_perf_counter_update(struct perf_counter *counter)
-{
- u64 prev, now;
- s64 delta;
-
- prev = atomic64_read(&counter->hw.prev_count);
- now = get_context_switches(counter);
-
- atomic64_set(&counter->hw.prev_count, now);
-
- delta = now - prev;
-
- atomic64_add(delta, &counter->count);
-}
-
-static void context_switches_perf_counter_read(struct perf_counter *counter)
-{
- context_switches_perf_counter_update(counter);
-}
-
-static int context_switches_perf_counter_enable(struct perf_counter *counter)
-{
- if (counter->prev_state <= PERF_COUNTER_STATE_OFF)
- atomic64_set(&counter->hw.prev_count,
- get_context_switches(counter));
- return 0;
-}
-
-static void context_switches_perf_counter_disable(struct perf_counter *counter)
-{
- context_switches_perf_counter_update(counter);
-}
-
-static const struct hw_perf_counter_ops perf_ops_context_switches = {
- .enable = context_switches_perf_counter_enable,
- .disable = context_switches_perf_counter_disable,
- .read = context_switches_perf_counter_read,
-};
-
-/*
* Software counter: cpu migrations
*/
@@ -1808,11 +1759,8 @@ sw_perf_counter_init(struct perf_counter *counter)
case PERF_COUNT_PAGE_FAULTS:
case PERF_COUNT_PAGE_FAULTS_MIN:
case PERF_COUNT_PAGE_FAULTS_MAJ:
- hw_ops = &perf_ops_generic;
- break;
case PERF_COUNT_CONTEXT_SWITCHES:
- if (!counter->hw_event.exclude_kernel)
- hw_ops = &perf_ops_context_switches;
+ hw_ops = &perf_ops_generic;
break;
case PERF_COUNT_CPU_MIGRATIONS:
if (!counter->hw_event.exclude_kernel)
diff --git a/kernel/sched.c b/kernel/sched.c
index cbfa5ab..7a4667d 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2911,14 +2911,8 @@ unsigned long nr_active(void)
/*
* Externally visible per-cpu scheduler statistics:
- * cpu_nr_switches(cpu) - number of context switches on that cpu
* cpu_nr_migrations(cpu) - number of migrations into that cpu
*/
-u64 cpu_nr_switches(int cpu)
-{
- return cpu_rq(cpu)->nr_switches;
-}
-
u64 cpu_nr_migrations(int cpu)
{
return cpu_rq(cpu)->nr_migrations_in;
--
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