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perf_events: Simplify code by removing cpu argument to hw_perf_group_sched_in() 

Since the cpu argument to hw_perf_group_sched_in() is always
smp_processor_id(), simplify the code a little by removing this argument
and using the current cpu where needed.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: David Miller <davem@davemloft.net>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1265890918.5396.3.camel@laptop>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2010-02-11 13:21:58 +01:00 committed by Ingo Molnar
parent 38331f62c2
commit 6e37738a2f
5 changed files with 38 additions and 47 deletions
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10
arch/powerpc/kernel/perf_event.c
View File

@ -718,10 +718,10 @@ static int collect_events(struct perf_event *group, int max_count,
return n;
}
static void event_sched_in(struct perf_event *event, int cpu)
static void event_sched_in(struct perf_event *event)
{
event->state = PERF_EVENT_STATE_ACTIVE;
event->oncpu = cpu;
event->oncpu = smp_processor_id();
event->tstamp_running += event->ctx->time - event->tstamp_stopped;
if (is_software_event(event))
event->pmu->enable(event);
@ -735,7 +735,7 @@ static void event_sched_in(struct perf_event *event, int cpu)
*/
int hw_perf_group_sched_in(struct perf_event *group_leader,
struct perf_cpu_context *cpuctx,
struct perf_event_context *ctx, int cpu)
struct perf_event_context *ctx)
{
struct cpu_hw_events *cpuhw;
long i, n, n0;
@ -766,10 +766,10 @@ int hw_perf_group_sched_in(struct perf_event *group_leader,
cpuhw->event[i]->hw.config = cpuhw->events[i];
cpuctx->active_oncpu += n;
n = 1;
event_sched_in(group_leader, cpu);
event_sched_in(group_leader);
list_for_each_entry(sub, &group_leader->sibling_list, group_entry) {
if (sub->state != PERF_EVENT_STATE_OFF) {
event_sched_in(sub, cpu);
event_sched_in(sub);
++n;
}
}

10
arch/sparc/kernel/perf_event.c
View File

@ -980,10 +980,10 @@ static int collect_events(struct perf_event *group, int max_count,
return n;
}
static void event_sched_in(struct perf_event *event, int cpu)
static void event_sched_in(struct perf_event *event)
{
event->state = PERF_EVENT_STATE_ACTIVE;
event->oncpu = cpu;
event->oncpu = smp_processor_id();
event->tstamp_running += event->ctx->time - event->tstamp_stopped;
if (is_software_event(event))
event->pmu->enable(event);
@ -991,7 +991,7 @@ static void event_sched_in(struct perf_event *event, int cpu)
int hw_perf_group_sched_in(struct perf_event *group_leader,
struct perf_cpu_context *cpuctx,
struct perf_event_context *ctx, int cpu)
struct perf_event_context *ctx)
{
struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
struct perf_event *sub;
@ -1015,10 +1015,10 @@ int hw_perf_group_sched_in(struct perf_event *group_leader,
cpuctx->active_oncpu += n;
n = 1;
event_sched_in(group_leader, cpu);
event_sched_in(group_leader);
list_for_each_entry(sub, &group_leader->sibling_list, group_entry) {
if (sub->state != PERF_EVENT_STATE_OFF) {
event_sched_in(sub, cpu);
event_sched_in(sub);
n++;
}
}

18
arch/x86/kernel/cpu/perf_event.c
View File

@ -2403,12 +2403,12 @@ done:
}
static int x86_event_sched_in(struct perf_event *event,
struct perf_cpu_context *cpuctx, int cpu)
struct perf_cpu_context *cpuctx)
{
int ret = 0;
event->state = PERF_EVENT_STATE_ACTIVE;
event->oncpu = cpu;
event->oncpu = smp_processor_id();
event->tstamp_running += event->ctx->time - event->tstamp_stopped;
if (!is_x86_event(event))
@ -2424,7 +2424,7 @@ static int x86_event_sched_in(struct perf_event *event,
}
static void x86_event_sched_out(struct perf_event *event,
struct perf_cpu_context *cpuctx, int cpu)
struct perf_cpu_context *cpuctx)
{
event->state = PERF_EVENT_STATE_INACTIVE;
event->oncpu = -1;
@ -2452,9 +2452,9 @@ static void x86_event_sched_out(struct perf_event *event,
*/
int hw_perf_group_sched_in(struct perf_event *leader,
struct perf_cpu_context *cpuctx,
struct perf_event_context *ctx, int cpu)
struct perf_event_context *ctx)
{
struct cpu_hw_events *cpuc = &per_cpu(cpu_hw_events, cpu);
struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
struct perf_event *sub;
int assign[X86_PMC_IDX_MAX];
int n0, n1, ret;
@ -2468,14 +2468,14 @@ int hw_perf_group_sched_in(struct perf_event *leader,
if (ret)
return ret;
ret = x86_event_sched_in(leader, cpuctx, cpu);
ret = x86_event_sched_in(leader, cpuctx);
if (ret)
return ret;
n1 = 1;
list_for_each_entry(sub, &leader->sibling_list, group_entry) {
if (sub->state > PERF_EVENT_STATE_OFF) {
ret = x86_event_sched_in(sub, cpuctx, cpu);
ret = x86_event_sched_in(sub, cpuctx);
if (ret)
goto undo;
++n1;
@ -2500,11 +2500,11 @@ int hw_perf_group_sched_in(struct perf_event *leader,
*/
return 1;
undo:
x86_event_sched_out(leader, cpuctx, cpu);
x86_event_sched_out(leader, cpuctx);
n0 = 1;
list_for_each_entry(sub, &leader->sibling_list, group_entry) {
if (sub->state == PERF_EVENT_STATE_ACTIVE) {
x86_event_sched_out(sub, cpuctx, cpu);
x86_event_sched_out(sub, cpuctx);
if (++n0 == n1)
break;
}

2
include/linux/perf_event.h
View File

@ -772,7 +772,7 @@ extern int perf_event_task_disable(void);
extern int perf_event_task_enable(void);
extern int hw_perf_group_sched_in(struct perf_event *group_leader,
struct perf_cpu_context *cpuctx,
struct perf_event_context *ctx, int cpu);
struct perf_event_context *ctx);
extern void perf_event_update_userpage(struct perf_event *event);
extern int perf_event_release_kernel(struct perf_event *event);
extern struct perf_event *

45
kernel/perf_event.c
View File

@ -103,7 +103,7 @@ void __weak hw_perf_event_setup_offline(int cpu) { barrier(); }
int __weak
hw_perf_group_sched_in(struct perf_event *group_leader,
struct perf_cpu_context *cpuctx,
struct perf_event_context *ctx, int cpu)
struct perf_event_context *ctx)
{
return 0;
}
@ -633,14 +633,13 @@ void perf_event_disable(struct perf_event *event)
static int
event_sched_in(struct perf_event *event,
struct perf_cpu_context *cpuctx,
struct perf_event_context *ctx,
int cpu)
struct perf_event_context *ctx)
{
if (event->state <= PERF_EVENT_STATE_OFF)
return 0;
event->state = PERF_EVENT_STATE_ACTIVE;
event->oncpu = cpu; /* TODO: put 'cpu' into cpuctx->cpu */
event->oncpu = smp_processor_id();
/*
* The new state must be visible before we turn it on in the hardware:
*/
@ -667,8 +666,7 @@ event_sched_in(struct perf_event *event,
static int
group_sched_in(struct perf_event *group_event,
struct perf_cpu_context *cpuctx,
struct perf_event_context *ctx,
int cpu)
struct perf_event_context *ctx)
{
struct perf_event *event, *partial_group;
int ret;
@ -676,18 +674,18 @@ group_sched_in(struct perf_event *group_event,
if (group_event->state == PERF_EVENT_STATE_OFF)
return 0;
ret = hw_perf_group_sched_in(group_event, cpuctx, ctx, cpu);
ret = hw_perf_group_sched_in(group_event, cpuctx, ctx);
if (ret)
return ret < 0 ? ret : 0;
if (event_sched_in(group_event, cpuctx, ctx, cpu))
if (event_sched_in(group_event, cpuctx, ctx))
return -EAGAIN;
/*
* Schedule in siblings as one group (if any):
*/
list_for_each_entry(event, &group_event->sibling_list, group_entry) {
if (event_sched_in(event, cpuctx, ctx, cpu)) {
if (event_sched_in(event, cpuctx, ctx)) {
partial_group = event;
goto group_error;
}
@ -761,7 +759,6 @@ static void __perf_install_in_context(void *info)
struct perf_event *event = info;
struct perf_event_context *ctx = event->ctx;
struct perf_event *leader = event->group_leader;
int cpu = smp_processor_id();
int err;
/*
@ -808,7 +805,7 @@ static void __perf_install_in_context(void *info)
if (!group_can_go_on(event, cpuctx, 1))
err = -EEXIST;
else
err = event_sched_in(event, cpuctx, ctx, cpu);
err = event_sched_in(event, cpuctx, ctx);
if (err) {
/*
@ -950,11 +947,9 @@ static void __perf_event_enable(void *info)
} else {
perf_disable();
if (event == leader)
err = group_sched_in(event, cpuctx, ctx,
smp_processor_id());
err = group_sched_in(event, cpuctx, ctx);
else
err = event_sched_in(event, cpuctx, ctx,
smp_processor_id());
err = event_sched_in(event, cpuctx, ctx);
perf_enable();
}
@ -1281,19 +1276,18 @@ static void cpu_ctx_sched_out(struct perf_cpu_context *cpuctx,
static void
ctx_pinned_sched_in(struct perf_event_context *ctx,
struct perf_cpu_context *cpuctx,
int cpu)
struct perf_cpu_context *cpuctx)
{
struct perf_event *event;
list_for_each_entry(event, &ctx->pinned_groups, group_entry) {
if (event->state <= PERF_EVENT_STATE_OFF)
continue;
if (event->cpu != -1 && event->cpu != cpu)
if (event->cpu != -1 && event->cpu != smp_processor_id())
continue;
if (group_can_go_on(event, cpuctx, 1))
group_sched_in(event, cpuctx, ctx, cpu);
group_sched_in(event, cpuctx, ctx);
/*
* If this pinned group hasn't been scheduled,
@ -1308,8 +1302,7 @@ ctx_pinned_sched_in(struct perf_event_context *ctx,
static void
ctx_flexible_sched_in(struct perf_event_context *ctx,
struct perf_cpu_context *cpuctx,
int cpu)
struct perf_cpu_context *cpuctx)
{
struct perf_event *event;
int can_add_hw = 1;
@ -1322,11 +1315,11 @@ ctx_flexible_sched_in(struct perf_event_context *ctx,
* Listen to the 'cpu' scheduling filter constraint
* of events:
*/
if (event->cpu != -1 && event->cpu != cpu)
if (event->cpu != -1 && event->cpu != smp_processor_id())
continue;
if (group_can_go_on(event, cpuctx, can_add_hw))
if (group_sched_in(event, cpuctx, ctx, cpu))
if (group_sched_in(event, cpuctx, ctx))
can_add_hw = 0;
}
}
@ -1336,8 +1329,6 @@ ctx_sched_in(struct perf_event_context *ctx,
struct perf_cpu_context *cpuctx,
enum event_type_t event_type)
{
int cpu = smp_processor_id();
raw_spin_lock(&ctx->lock);
ctx->is_active = 1;
if (likely(!ctx->nr_events))
@ -1352,11 +1343,11 @@ ctx_sched_in(struct perf_event_context *ctx,
* in order to give them the best chance of going on.
*/
if (event_type & EVENT_PINNED)
ctx_pinned_sched_in(ctx, cpuctx, cpu);
ctx_pinned_sched_in(ctx, cpuctx);
/* Then walk through the lower prio flexible groups */
if (event_type & EVENT_FLEXIBLE)
ctx_flexible_sched_in(ctx, cpuctx, cpu);
ctx_flexible_sched_in(ctx, cpuctx);
perf_enable();
out: