X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=lttng-context-perf-counters.c;h=9fa6db50b8735e136fd666a51018fd0c47bbe151;hb=b53047135828b997a4eeb2cae7344cb169aa9c8c;hp=2c67ecf3eebc3978e965571bacf10d26f76a7c8f;hpb=13ab8b0a749053960f81a4924a3ed27775518f94;p=lttng-modules.git diff --git a/lttng-context-perf-counters.c b/lttng-context-perf-counters.c index 2c67ecf3..9fa6db50 100644 --- a/lttng-context-perf-counters.c +++ b/lttng-context-perf-counters.c @@ -1,23 +1,10 @@ -/* +/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) + * * 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 @@ -26,11 +13,10 @@ #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" +#include +#include +#include +#include static size_t perf_counter_get_size(size_t offset) @@ -72,97 +58,72 @@ void perf_counter_record(struct lttng_ctx_field *field, 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 + { + int ret; + + ret = cpuhp_state_remove_instance(lttng_hp_online, + &field->u.perf_counter->cpuhp_online.node); + WARN_ON(ret); + ret = cpuhp_state_remove_instance(lttng_hp_prepare, + &field->u.perf_counter->cpuhp_prepare.node); + WARN_ON(ret); + } kfree(field->event_field.name); kfree(field->u.perf_counter->attr); - kfree(events); + kvfree(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 lttng_perf_counter_cpu_hp_callback(struct notifier_block *nb, - unsigned long action, - void *hcpu) +int lttng_cpuhp_perf_counter_online(unsigned int cpu, + struct lttng_cpuhp_node *node) { - unsigned int cpu = (unsigned long) hcpu; struct lttng_perf_counter_field *perf_field = - container_of(nb, struct lttng_perf_counter_field, nb); + container_of(node, struct lttng_perf_counter_field, + cpuhp_online); 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 */ + pevent = perf_event_create_kernel_counter(attr, + cpu, NULL, overflow_callback, NULL); + if (!pevent || IS_ERR(pevent)) + return -EINVAL; + if (pevent->state == PERF_EVENT_STATE_ERROR) { perf_event_release_kernel(pevent); - break; + return -EINVAL; } - return NOTIFY_OK; + barrier(); /* Create perf counter before setting event */ + events[cpu] = pevent; + return 0; } -#endif +int lttng_cpuhp_perf_counter_dead(unsigned int cpu, + struct lttng_cpuhp_node *node) +{ + struct lttng_perf_counter_field *perf_field = + container_of(node, struct lttng_perf_counter_field, + cpuhp_prepare); + struct perf_event **events = perf_field->e; + struct perf_event *pevent; + + pevent = events[cpu]; + events[cpu] = NULL; + barrier(); /* NULLify event before perf counter teardown */ + perf_event_release_kernel(pevent); + return 0; +} int lttng_add_perf_counter_to_ctx(uint32_t type, uint64_t config, @@ -174,10 +135,9 @@ int lttng_add_perf_counter_to_ctx(uint32_t type, 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); + events = kvzalloc(num_possible_cpus() * sizeof(*events), GFP_KERNEL); if (!events) return -ENOMEM; @@ -217,56 +177,44 @@ int lttng_add_perf_counter_to_ctx(uint32_t type, 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 + perf_field->cpuhp_prepare.component = LTTNG_CONTEXT_PERF_COUNTERS; + ret = cpuhp_state_add_instance(lttng_hp_prepare, + &perf_field->cpuhp_prepare.node); + if (ret) + goto cpuhp_prepare_error; - 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(); + perf_field->cpuhp_online.component = LTTNG_CONTEXT_PERF_COUNTERS; + ret = cpuhp_state_add_instance(lttng_hp_online, + &perf_field->cpuhp_online.node); + if (ret) + goto cpuhp_online_error; 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 = 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->event_field.type.u.integer.size = sizeof(uint64_t) * CHAR_BIT; + field->event_field.type.u.integer.alignment = lttng_alignof(uint64_t) * CHAR_BIT; + field->event_field.type.u.integer.signedness = lttng_is_signed_type(uint64_t); + field->event_field.type.u.integer.reverse_byte_order = 0; + field->event_field.type.u.integer.base = 10; + field->event_field.type.u.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; + lttng_context_update(*ctx); - 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]); +cpuhp_online_error: + { + int remove_ret; + + remove_ret = cpuhp_state_remove_instance(lttng_hp_prepare, + &perf_field->cpuhp_prepare.node); + WARN_ON(remove_ret); } - put_online_cpus(); -#ifdef CONFIG_HOTPLUG_CPU - unregister_cpu_notifier(&perf_field->nb); -#endif +cpuhp_prepare_error: find_error: lttng_remove_context_field(ctx, field); append_context_error: @@ -276,14 +224,6 @@ name_alloc_error: error_alloc_perf_field: kfree(attr); error_attr: - kfree(events); + kvfree(events); return ret; } - -MODULE_LICENSE("GPL and additional rights"); -MODULE_AUTHOR("Mathieu Desnoyers"); -MODULE_DESCRIPTION("Linux Trace Toolkit Perf Support"); -MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." - __stringify(LTTNG_MODULES_MINOR_VERSION) "." - __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) - LTTNG_MODULES_EXTRAVERSION);