X-Git-Url: http://git.liburcu.org/?p=lttng-modules.git;a=blobdiff_plain;f=lttng-context-perf-counters.c;h=43c4077bb7a766f46543d6e8090261497d47b1a0;hp=b97b40b9386683ab6f6a4193b93c75199efffed8;hb=HEAD;hpb=886d51a3d7ed5fa6b41d7f19b3e14ae6c535a44c diff --git a/lttng-context-perf-counters.c b/lttng-context-perf-counters.c deleted file mode 100644 index b97b40b9..00000000 --- a/lttng-context-perf-counters.c +++ /dev/null @@ -1,284 +0,0 @@ -/* - * lttng-context-perf-counters.c - * - * LTTng performance monitoring counters (perf-counters) integration module. - * - * Copyright (C) 2009-2012 Mathieu Desnoyers - * - * 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 -#include -#include -#include -#include -#include "lttng-events.h" -#include "wrapper/ringbuffer/frontend_types.h" -#include "wrapper/vmalloc.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, 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 lttng_channel *chan) -{ - struct perf_event *event; - uint64_t value; - - event = field->u.perf_counter->e[ctx->cpu]; - if (likely(event)) { - 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 - * perf counter before the cpu is brought up. Therefore, we need - * to support having events coming (e.g. scheduler events) - * before the counter is setup. Write an arbitrary 0 in this - * case. - */ - value = 0; - } - 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; - int cpu; - - get_online_cpus(); - for_each_online_cpu(cpu) - perf_event_release_kernel(events[cpu]); - put_online_cpus(); -#ifdef CONFIG_HOTPLUG_CPU - unregister_cpu_notifier(&field->u.perf_counter->nb); -#endif - kfree(field->event_field.name); - kfree(field->u.perf_counter->attr); - kfree(events); - kfree(field->u.perf_counter); -} - -#ifdef CONFIG_HOTPLUG_CPU - -/** - * lttng_perf_counter_hp_callback - CPU hotplug callback - * @nb: notifier block - * @action: hotplug action to take - * @hcpu: CPU number - * - * Returns the success/failure of the operation. (%NOTIFY_OK, %NOTIFY_BAD) - * - * We can setup perf counters when the cpu is online (up prepare seems to be too - * soon). - */ -static -int __cpuinit lttng_perf_counter_cpu_hp_callback(struct notifier_block *nb, - unsigned long action, - void *hcpu) -{ - unsigned int cpu = (unsigned long) hcpu; - 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 (!perf_field->hp_enable) - return NOTIFY_OK; - - switch (action) { - case CPU_ONLINE: - case CPU_ONLINE_FROZEN: - pevent = wrapper_perf_event_create_kernel_counter(attr, - cpu, NULL, overflow_callback); - 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; - case CPU_UP_CANCELED: - case CPU_UP_CANCELED_FROZEN: - case CPU_DEAD: - case CPU_DEAD_FROZEN: - pevent = events[cpu]; - events[cpu] = NULL; - barrier(); /* NULLify event before perf counter teardown */ - perf_event_release_kernel(pevent); - break; - } - return NOTIFY_OK; -} - -#endif - -int lttng_add_perf_counter_to_ctx(uint32_t type, - uint64_t config, - const char *name, - 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; - int cpu; - char *name_alloc; - - events = kzalloc(num_possible_cpus() * sizeof(*events), GFP_KERNEL); - if (!events) - return -ENOMEM; - - attr = kzalloc(sizeof(struct perf_event_attr), GFP_KERNEL); - if (!attr) { - ret = -ENOMEM; - goto error_attr; - } - - attr->type = type; - attr->config = config; - attr->size = sizeof(struct perf_event_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; - goto name_alloc_error; - } - - field = lttng_append_context(ctx); - if (!field) { - ret = -ENOMEM; - goto append_context_error; - } - if (lttng_find_context(*ctx, name_alloc)) { - ret = -EEXIST; - goto find_error; - } - -#ifdef CONFIG_HOTPLUG_CPU - perf_field->nb.notifier_call = - lttng_perf_counter_cpu_hp_callback; - perf_field->nb.priority = 0; - register_cpu_notifier(&perf_field->nb); -#endif - - get_online_cpus(); - for_each_online_cpu(cpu) { - events[cpu] = wrapper_perf_event_create_kernel_counter(attr, - cpu, NULL, overflow_callback); - 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->destroy = lttng_destroy_perf_counter_field; - - field->event_field.name = name_alloc; - field->event_field.type.atype = atype_integer; - 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 = 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 = 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] && !IS_ERR(events[cpu])) - perf_event_release_kernel(events[cpu]); - } - put_online_cpus(); -#ifdef CONFIG_HOTPLUG_CPU - 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); - return ret; -} - -MODULE_LICENSE("GPL and additional rights"); -MODULE_AUTHOR("Mathieu Desnoyers"); -MODULE_DESCRIPTION("Linux Trace Toolkit Perf Support");