/*
- * (C) Copyright 2009-2011 -
- * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * lttng-context-perf-counters.c
*
* LTTng performance monitoring counters (perf-counters) integration module.
*
- * Dual LGPL v2.1/GPL v2 license.
+ * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; only
+ * version 2.1 of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/module.h>
#include <linux/perf_event.h>
#include <linux/list.h>
#include <linux/string.h>
-#include "ltt-events.h"
+#include <linux/cpu.h>
+#include "lttng-events.h"
#include "wrapper/ringbuffer/frontend_types.h"
#include "wrapper/vmalloc.h"
-#include "ltt-tracer.h"
+#include "wrapper/perf.h"
+#include "lttng-tracer.h"
static
size_t perf_counter_get_size(size_t offset)
{
size_t size = 0;
- size += lib_ring_buffer_align(offset, ltt_alignof(uint64_t));
+ size += lib_ring_buffer_align(offset, lttng_alignof(uint64_t));
size += sizeof(uint64_t);
return size;
}
static
void perf_counter_record(struct lttng_ctx_field *field,
struct lib_ring_buffer_ctx *ctx,
- struct ltt_channel *chan)
+ struct lttng_channel *chan)
{
struct perf_event *event;
uint64_t value;
- event = field->u.perf_counter.e[ctx->cpu];
+ event = field->u.perf_counter->e[ctx->cpu];
if (likely(event)) {
- event->pmu->read(event);
- value = local64_read(&event->count);
+ if (unlikely(event->state == PERF_EVENT_STATE_ERROR)) {
+ value = 0;
+ } else {
+ event->pmu->read(event);
+ value = local64_read(&event->count);
+ }
} else {
/*
* Perf chooses not to be clever and not to support enabling a
*/
value = 0;
}
- lib_ring_buffer_align_ctx(ctx, ltt_alignof(value));
+ lib_ring_buffer_align_ctx(ctx, lttng_alignof(value));
chan->ops->event_write(ctx, &value, sizeof(value));
}
+#if defined(CONFIG_PERF_EVENTS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(3,0,99))
+static
+void overflow_callback(struct perf_event *event,
+ struct perf_sample_data *data,
+ struct pt_regs *regs)
+{
+}
+#else
static
void overflow_callback(struct perf_event *event, int nmi,
struct perf_sample_data *data,
struct pt_regs *regs)
{
}
+#endif
static
void lttng_destroy_perf_counter_field(struct lttng_ctx_field *field)
{
- struct perf_event **events = field->u.perf_counter.e;
+ struct perf_event **events = field->u.perf_counter->e;
int cpu;
get_online_cpus();
perf_event_release_kernel(events[cpu]);
put_online_cpus();
#ifdef CONFIG_HOTPLUG_CPU
- unregister_cpu_notifier(&field->u.perf_counter.nb);
+ unregister_cpu_notifier(&field->u.perf_counter->nb);
#endif
kfree(field->event_field.name);
- kfree(field->u.perf_counter.attr);
+ kfree(field->u.perf_counter->attr);
kfree(events);
+ kfree(field->u.perf_counter);
}
#ifdef CONFIG_HOTPLUG_CPU
* soon).
*/
static
-int __cpuinit lttng_perf_counter_cpu_hp_callback(struct notifier_block *nb,
+int lttng_perf_counter_cpu_hp_callback(struct notifier_block *nb,
unsigned long action,
void *hcpu)
{
unsigned int cpu = (unsigned long) hcpu;
- struct lttng_ctx_field *field =
- container_of(nb, struct lttng_ctx_field, u.perf_counter.nb);
- struct perf_event **events = field->u.perf_counter.e;
- struct perf_event_attr *attr = field->u.perf_counter.attr;
+ struct lttng_perf_counter_field *perf_field =
+ container_of(nb, struct lttng_perf_counter_field, nb);
+ struct perf_event **events = perf_field->e;
+ struct perf_event_attr *attr = perf_field->attr;
struct perf_event *pevent;
- if (!field->u.perf_counter.hp_enable)
+ if (!perf_field->hp_enable)
return NOTIFY_OK;
switch (action) {
case CPU_ONLINE:
case CPU_ONLINE_FROZEN:
- pevent = perf_event_create_kernel_counter(attr,
+ pevent = wrapper_perf_event_create_kernel_counter(attr,
cpu, NULL, overflow_callback);
- if (!pevent)
+ if (!pevent || IS_ERR(pevent))
+ return NOTIFY_BAD;
+ if (pevent->state == PERF_EVENT_STATE_ERROR) {
+ perf_event_release_kernel(pevent);
return NOTIFY_BAD;
+ }
barrier(); /* Create perf counter before setting event */
events[cpu] = pevent;
break;
struct lttng_ctx **ctx)
{
struct lttng_ctx_field *field;
+ struct lttng_perf_counter_field *perf_field;
struct perf_event **events;
struct perf_event_attr *attr;
int ret;
if (!events)
return -ENOMEM;
- attr = kzalloc(sizeof(*field->u.perf_counter.attr), GFP_KERNEL);
+ attr = kzalloc(sizeof(struct perf_event_attr), GFP_KERNEL);
if (!attr) {
ret = -ENOMEM;
goto error_attr;
attr->pinned = 1;
attr->disabled = 0;
+ perf_field = kzalloc(sizeof(struct lttng_perf_counter_field), GFP_KERNEL);
+ if (!perf_field) {
+ ret = -ENOMEM;
+ goto error_alloc_perf_field;
+ }
+ perf_field->e = events;
+ perf_field->attr = attr;
+
name_alloc = kstrdup(name, GFP_KERNEL);
if (!name_alloc) {
ret = -ENOMEM;
ret = -ENOMEM;
goto append_context_error;
}
+ if (lttng_find_context(*ctx, name_alloc)) {
+ ret = -EEXIST;
+ goto find_error;
+ }
#ifdef CONFIG_HOTPLUG_CPU
- field->u.perf_counter.nb.notifier_call =
+ perf_field->nb.notifier_call =
lttng_perf_counter_cpu_hp_callback;
- field->u.perf_counter.nb.priority = 0;
- register_cpu_notifier(&field->u.perf_counter.nb);
+ perf_field->nb.priority = 0;
+ register_cpu_notifier(&perf_field->nb);
#endif
get_online_cpus();
for_each_online_cpu(cpu) {
- events[cpu] = perf_event_create_kernel_counter(attr,
+ events[cpu] = wrapper_perf_event_create_kernel_counter(attr,
cpu, NULL, overflow_callback);
- if (!events[cpu]) {
+ if (!events[cpu] || IS_ERR(events[cpu])) {
ret = -EINVAL;
goto counter_error;
}
+ if (events[cpu]->state == PERF_EVENT_STATE_ERROR) {
+ ret = -EBUSY;
+ goto counter_busy;
+ }
}
put_online_cpus();
field->event_field.name = name_alloc;
field->event_field.type.atype = atype_integer;
- field->event_field.type.u.basic.integer.size = sizeof(unsigned long) * CHAR_BIT;
- field->event_field.type.u.basic.integer.alignment = ltt_alignof(unsigned long) * CHAR_BIT;
- field->event_field.type.u.basic.integer.signedness = is_signed_type(unsigned long);
+ field->event_field.type.u.basic.integer.size = sizeof(uint64_t) * CHAR_BIT;
+ field->event_field.type.u.basic.integer.alignment = lttng_alignof(uint64_t) * CHAR_BIT;
+ field->event_field.type.u.basic.integer.signedness = lttng_is_signed_type(uint64_t);
field->event_field.type.u.basic.integer.reverse_byte_order = 0;
field->event_field.type.u.basic.integer.base = 10;
field->event_field.type.u.basic.integer.encoding = lttng_encode_none;
field->get_size = perf_counter_get_size;
field->record = perf_counter_record;
- field->u.perf_counter.e = events;
- field->u.perf_counter.attr = attr;
- field->u.perf_counter.hp_enable = 1;
+ field->u.perf_counter = perf_field;
+ perf_field->hp_enable = 1;
wrapper_vmalloc_sync_all();
return 0;
+counter_busy:
counter_error:
for_each_online_cpu(cpu) {
- if (events[cpu])
+ if (events[cpu] && !IS_ERR(events[cpu]))
perf_event_release_kernel(events[cpu]);
}
put_online_cpus();
#ifdef CONFIG_HOTPLUG_CPU
- unregister_cpu_notifier(&field->u.perf_counter.nb);
+ unregister_cpu_notifier(&perf_field->nb);
#endif
+find_error:
lttng_remove_context_field(ctx, field);
append_context_error:
kfree(name_alloc);
name_alloc_error:
+ kfree(perf_field);
+error_alloc_perf_field:
kfree(attr);
error_attr:
kfree(events);
projects / lttng-modules.git / blobdiff