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perf: Remove the sysfs bits

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Neither the overcommit nor the reservation sysfs parameter were
actually working, remove them as they'll only get in the way.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: paulus <paulus@samba.org>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2010-09-06 15:51:45 +02:00
committed by Ingo Molnar
parent a4eaf7f146
commit 15ac9a395a
6 changed files with 5 additions and 147 deletions
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124
kernel/perf_event.c
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@@ -39,10 +39,6 @@
*/
static DEFINE_PER_CPU(struct perf_cpu_context, perf_cpu_context);
int perf_max_events __read_mostly = 1;
static int perf_reserved_percpu __read_mostly;
static int perf_overcommit __read_mostly = 1;
static atomic_t nr_events __read_mostly;
static atomic_t nr_mmap_events __read_mostly;
static atomic_t nr_comm_events __read_mostly;
@@ -66,11 +62,6 @@ int sysctl_perf_event_sample_rate __read_mostly = 100000;
static atomic64_t perf_event_id;
/*
* Lock for (sysadmin-configurable) event reservations:
*/
static DEFINE_SPINLOCK(perf_resource_lock);
void __weak perf_event_print_debug(void) { }
void perf_pmu_disable(struct pmu *pmu)
@@ -480,16 +471,6 @@ static void __perf_event_remove_from_context(void *info)
list_del_event(event, ctx);
if (!ctx->task) {
/*
* Allow more per task events with respect to the
* reservation:
*/
cpuctx->max_pertask =
min(perf_max_events - ctx->nr_events,
perf_max_events - perf_reserved_percpu);
}
raw_spin_unlock(&ctx->lock);
}
@@ -823,9 +804,6 @@ static void __perf_install_in_context(void *info)
}
}
if (!err && !ctx->task && cpuctx->max_pertask)
cpuctx->max_pertask--;
unlock:
raw_spin_unlock(&ctx->lock);
}
@@ -5930,10 +5908,6 @@ static void __cpuinit perf_event_init_cpu(int cpu)
cpuctx = &per_cpu(perf_cpu_context, cpu);
spin_lock(&perf_resource_lock);
cpuctx->max_pertask = perf_max_events - perf_reserved_percpu;
spin_unlock(&perf_resource_lock);
mutex_lock(&cpuctx->hlist_mutex);
if (cpuctx->hlist_refcount > 0) {
struct swevent_hlist *hlist;
@@ -6008,101 +5982,3 @@ void __init perf_event_init(void)
perf_tp_register();
perf_cpu_notifier(perf_cpu_notify);
}
static ssize_t perf_show_reserve_percpu(struct sysdev_class *class,
struct sysdev_class_attribute *attr,
char *buf)
{
return sprintf(buf, "%d\n", perf_reserved_percpu);
}
static ssize_t
perf_set_reserve_percpu(struct sysdev_class *class,
struct sysdev_class_attribute *attr,
const char *buf,
size_t count)
{
struct perf_cpu_context *cpuctx;
unsigned long val;
int err, cpu, mpt;
err = strict_strtoul(buf, 10, &val);
if (err)
return err;
if (val > perf_max_events)
return -EINVAL;
spin_lock(&perf_resource_lock);
perf_reserved_percpu = val;
for_each_online_cpu(cpu) {
cpuctx = &per_cpu(perf_cpu_context, cpu);
raw_spin_lock_irq(&cpuctx->ctx.lock);
mpt = min(perf_max_events - cpuctx->ctx.nr_events,
perf_max_events - perf_reserved_percpu);
cpuctx->max_pertask = mpt;
raw_spin_unlock_irq(&cpuctx->ctx.lock);
}
spin_unlock(&perf_resource_lock);
return count;
}
static ssize_t perf_show_overcommit(struct sysdev_class *class,
struct sysdev_class_attribute *attr,
char *buf)
{
return sprintf(buf, "%d\n", perf_overcommit);
}
static ssize_t
perf_set_overcommit(struct sysdev_class *class,
struct sysdev_class_attribute *attr,
const char *buf, size_t count)
{
unsigned long val;
int err;
err = strict_strtoul(buf, 10, &val);
if (err)
return err;
if (val > 1)
return -EINVAL;
spin_lock(&perf_resource_lock);
perf_overcommit = val;
spin_unlock(&perf_resource_lock);
return count;
}
static SYSDEV_CLASS_ATTR(
reserve_percpu,
0644,
perf_show_reserve_percpu,
perf_set_reserve_percpu
);
static SYSDEV_CLASS_ATTR(
overcommit,
0644,
perf_show_overcommit,
perf_set_overcommit
);
static struct attribute *perfclass_attrs[] = {
&attr_reserve_percpu.attr,
&attr_overcommit.attr,
NULL
};
static struct attribute_group perfclass_attr_group = {
.attrs = perfclass_attrs,
.name = "perf_events",
};
static int __init perf_event_sysfs_init(void)
{
return sysfs_create_group(&cpu_sysdev_class.kset.kobj,
&perfclass_attr_group);
}
device_initcall(perf_event_sysfs_init);