+++ /dev/null
-/*
- * Copyright (C) 2017 - Julien Desfossez <jdesfossez@efficios.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License, version 2 only, as
- * published by the Free Software Foundation.
- *
- * This program 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 General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc., 51
- * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#define _LGPL_SOURCE
-#include <lttng/trigger/trigger.h>
-#include <common/error.h>
-#include <common/config/session-config.h>
-#include <common/defaults.h>
-#include <common/utils.h>
-#include <common/futex.h>
-#include <common/align.h>
-#include <common/time.h>
-#include <common/hashtable/utils.h>
-#include <sys/eventfd.h>
-#include <sys/stat.h>
-#include <time.h>
-#include <signal.h>
-#include <inttypes.h>
-
-#include <common/kernel-ctl/kernel-ctl.h>
-#include <lttng/notification/channel-internal.h>
-#include <lttng/rotate-internal.h>
-
-#include "rotation-thread.h"
-#include "lttng-sessiond.h"
-#include "health-sessiond.h"
-#include "rotate.h"
-#include "cmd.h"
-#include "session.h"
-#include "sessiond-timer.h"
-
-#include <urcu.h>
-#include <urcu/list.h>
-#include <urcu/rculfhash.h>
-
-/*
- * Store a struct rotation_channel_info for each channel that is currently
- * being rotated by the consumer.
- */
-struct cds_lfht *channel_pending_rotate_ht;
-
-struct rotation_thread_state {
- struct lttng_poll_event events;
-};
-
-static
-void channel_rotation_info_destroy(struct rotation_channel_info *channel_info)
-{
- assert(channel_info);
- free(channel_info);
-}
-
-static
-int match_channel_info(struct cds_lfht_node *node, const void *key)
-{
- struct rotation_channel_key *channel_key = (struct rotation_channel_key *) key;
- struct rotation_channel_info *channel_info;
-
- channel_info = caa_container_of(node, struct rotation_channel_info,
- rotate_channels_ht_node);
-
- return !!((channel_key->key == channel_info->channel_key.key) &&
- (channel_key->domain == channel_info->channel_key.domain));
-}
-
-static
-struct rotation_channel_info *lookup_channel_pending(uint64_t key,
- enum lttng_domain_type domain)
-{
- struct cds_lfht_iter iter;
- struct cds_lfht_node *node;
- struct rotation_channel_info *channel_info = NULL;
- struct rotation_channel_key channel_key = { .key = key,
- .domain = domain };
-
- cds_lfht_lookup(channel_pending_rotate_ht,
- hash_channel_key(&channel_key),
- match_channel_info,
- &channel_key, &iter);
- node = cds_lfht_iter_get_node(&iter);
- if (!node) {
- goto end;
- }
-
- channel_info = caa_container_of(node, struct rotation_channel_info,
- rotate_channels_ht_node);
- cds_lfht_del(channel_pending_rotate_ht, node);
-end:
- return channel_info;
-}
-
-/*
- * Destroy the thread data previously created by the init function.
- */
-void rotation_thread_handle_destroy(
- struct rotation_thread_handle *handle)
-{
- int ret;
-
- if (!handle) {
- goto end;
- }
-
- if (handle->ust32_consumer >= 0) {
- ret = close(handle->ust32_consumer);
- if (ret) {
- PERROR("close 32-bit consumer channel rotation pipe");
- }
- }
- if (handle->ust64_consumer >= 0) {
- ret = close(handle->ust64_consumer);
- if (ret) {
- PERROR("close 64-bit consumer channel rotation pipe");
- }
- }
- if (handle->kernel_consumer >= 0) {
- ret = close(handle->kernel_consumer);
- if (ret) {
- PERROR("close kernel consumer channel rotation pipe");
- }
- }
-
-end:
- free(handle);
-}
-
-struct rotation_thread_handle *rotation_thread_handle_create(
- struct lttng_pipe *ust32_channel_rotate_pipe,
- struct lttng_pipe *ust64_channel_rotate_pipe,
- struct lttng_pipe *kernel_channel_rotate_pipe,
- int thread_quit_pipe,
- struct rotation_thread_timer_queue *rotation_timer_queue)
-{
- struct rotation_thread_handle *handle;
-
- handle = zmalloc(sizeof(*handle));
- if (!handle) {
- goto end;
- }
-
- if (ust32_channel_rotate_pipe) {
- handle->ust32_consumer =
- lttng_pipe_release_readfd(
- ust32_channel_rotate_pipe);
- if (handle->ust32_consumer < 0) {
- goto error;
- }
- } else {
- handle->ust32_consumer = -1;
- }
- if (ust64_channel_rotate_pipe) {
- handle->ust64_consumer =
- lttng_pipe_release_readfd(
- ust64_channel_rotate_pipe);
- if (handle->ust64_consumer < 0) {
- goto error;
- }
- } else {
- handle->ust64_consumer = -1;
- }
- if (kernel_channel_rotate_pipe) {
- handle->kernel_consumer =
- lttng_pipe_release_readfd(
- kernel_channel_rotate_pipe);
- if (handle->kernel_consumer < 0) {
- goto error;
- }
- } else {
- handle->kernel_consumer = -1;
- }
- handle->thread_quit_pipe = thread_quit_pipe;
- handle->rotation_timer_queue = rotation_timer_queue;
-
-end:
- return handle;
-error:
- rotation_thread_handle_destroy(handle);
- return NULL;
-}
-
-static
-int init_poll_set(struct lttng_poll_event *poll_set,
- struct rotation_thread_handle *handle)
-{
- int ret;
-
- /*
- * Create pollset with size 5:
- * - sessiond quit pipe
- * - sessiond timer pipe,
- * - consumerd (32-bit user space) channel rotate pipe,
- * - consumerd (64-bit user space) channel rotate pipe,
- * - consumerd (kernel) channel rotate pipe,
- */
- ret = lttng_poll_create(poll_set, 5, LTTNG_CLOEXEC);
- if (ret < 0) {
- goto end;
- }
-
- ret = lttng_poll_add(poll_set, handle->thread_quit_pipe,
- LPOLLIN | LPOLLERR);
- if (ret < 0) {
- ERR("[rotation-thread] Failed to add thread_quit_pipe fd to pollset");
- goto error;
- }
- ret = lttng_poll_add(poll_set,
- lttng_pipe_get_readfd(handle->rotation_timer_queue->event_pipe),
- LPOLLIN | LPOLLERR);
- if (ret < 0) {
- ERR("[rotation-thread] Failed to add rotate_pending fd to pollset");
- goto error;
- }
- ret = lttng_poll_add(poll_set, handle->ust32_consumer,
- LPOLLIN | LPOLLERR);
- if (ret < 0) {
- ERR("[rotation-thread] Failed to add ust-32 channel rotation pipe fd to pollset");
- goto error;
- }
- ret = lttng_poll_add(poll_set, handle->ust64_consumer,
- LPOLLIN | LPOLLERR);
- if (ret < 0) {
- ERR("[rotation-thread] Failed to add ust-64 channel rotation pipe fd to pollset");
- goto error;
- }
- if (handle->kernel_consumer >= 0) {
- ret = lttng_poll_add(poll_set, handle->kernel_consumer,
- LPOLLIN | LPOLLERR);
- if (ret < 0) {
- ERR("[rotation-thread] Failed to add kernel channel rotation pipe fd to pollset");
- goto error;
- }
- }
-
-end:
- return ret;
-error:
- lttng_poll_clean(poll_set);
- return ret;
-}
-
-static
-void fini_thread_state(struct rotation_thread_state *state)
-{
- lttng_poll_clean(&state->events);
- cds_lfht_destroy(channel_pending_rotate_ht, NULL);
-}
-
-static
-int init_thread_state(struct rotation_thread_handle *handle,
- struct rotation_thread_state *state)
-{
- int ret;
-
- memset(state, 0, sizeof(*state));
- lttng_poll_init(&state->events);
-
- ret = init_poll_set(&state->events, handle);
- if (ret) {
- ERR("[rotation-thread] Failed to initialize rotation thread poll set");
- goto end;
- }
-
- channel_pending_rotate_ht = cds_lfht_new(DEFAULT_HT_SIZE,
- 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL);
- if (!channel_pending_rotate_ht) {
- ERR("[rotation-thread] Failed to create channel pending rotation hash table");
- ret = -1;
- goto end;
- }
-
-end:
- return ret;
-}
-
-static
-int handle_channel_rotation_pipe(int fd, uint32_t revents,
- struct rotation_thread_handle *handle,
- struct rotation_thread_state *state)
-{
- int ret = 0;
- enum lttng_domain_type domain;
- struct rotation_channel_info *channel_info;
- struct ltt_session *session = NULL;
- uint64_t key;
-
- if (fd == handle->ust32_consumer ||
- fd == handle->ust64_consumer) {
- domain = LTTNG_DOMAIN_UST;
- } else if (fd == handle->kernel_consumer) {
- domain = LTTNG_DOMAIN_KERNEL;
- } else {
- ERR("[rotation-thread] Unknown channel rotation pipe fd %d",
- fd);
- abort();
- }
-
- if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- ret = lttng_poll_del(&state->events, fd);
- if (ret) {
- ERR("[rotation-thread] Failed to remove consumer "
- "rotation pipe from poll set");
- }
- goto end;
- }
-
- do {
- ret = read(fd, &key, sizeof(key));
- } while (ret == -1 && errno == EINTR);
- if (ret != sizeof(key)) {
- ERR("[rotation-thread] Failed to read from pipe (fd = %i)",
- fd);
- ret = -1;
- goto end;
- }
-
- DBG("[rotation-thread] Received notification for chan %" PRIu64
- ", domain %d\n", key, domain);
-
- channel_info = lookup_channel_pending(key, domain);
- if (!channel_info) {
- ERR("[rotation-thread] Failed to find channel_info (key = %"
- PRIu64 ")", key);
- ret = -1;
- goto end;
- }
- rcu_read_lock();
- session_lock_list();
- session = session_find_by_id(channel_info->session_id);
- if (!session) {
- /*
- * The session may have been destroyed before we had a chance to
- * perform this action, return gracefully.
- */
- DBG("[rotation-thread] Session %" PRIu64 " not found",
- channel_info->session_id);
- ret = 0;
- goto end_unlock_session_list;
- }
-
- session_lock(session);
- if (--session->nr_chan_rotate_pending == 0) {
- time_t now = time(NULL);
-
- if (now == (time_t) -1) {
- session->rotation_status = LTTNG_ROTATION_STATUS_ERROR;
- ret = LTTNG_ERR_UNK;
- goto end_unlock_session;
- }
-
- ret = rename_complete_chunk(session, now);
- if (ret < 0) {
- ERR("Failed to rename completed rotation chunk");
- goto end_unlock_session;
- }
- session->rotate_pending = false;
- session->rotation_status = LTTNG_ROTATION_STATUS_COMPLETED;
- session->last_chunk_start_ts = session->current_chunk_start_ts;
- DBG("Rotation completed for session %s", session->name);
- }
-
- ret = 0;
-
-end_unlock_session:
- channel_rotation_info_destroy(channel_info);
- session_unlock(session);
-end_unlock_session_list:
- session_unlock_list();
- rcu_read_unlock();
-end:
- return ret;
-}
-
-void *thread_rotation(void *data)
-{
- int ret;
- struct rotation_thread_handle *handle = data;
- struct rotation_thread_state state;
-
- DBG("[rotation-thread] Started rotation thread");
-
- if (!handle) {
- ERR("[rotation-thread] Invalid thread context provided");
- goto end;
- }
-
- rcu_register_thread();
- rcu_thread_online();
-
- health_register(health_sessiond, HEALTH_SESSIOND_TYPE_ROTATION);
- health_code_update();
-
- ret = init_thread_state(handle, &state);
- if (ret) {
- goto end;
- }
-
- /* Ready to handle client connections. */
- sessiond_notify_ready();
-
- while (true) {
- int fd_count, i;
-
- health_poll_entry();
- DBG("[rotation-thread] Entering poll wait");
- ret = lttng_poll_wait(&state.events, -1);
- DBG("[rotation-thread] Poll wait returned (%i)", ret);
- health_poll_exit();
- if (ret < 0) {
- /*
- * Restart interrupted system call.
- */
- if (errno == EINTR) {
- continue;
- }
- ERR("[rotation-thread] Error encountered during lttng_poll_wait (%i)", ret);
- goto error;
- }
-
- fd_count = ret;
- for (i = 0; i < fd_count; i++) {
- int fd = LTTNG_POLL_GETFD(&state.events, i);
- uint32_t revents = LTTNG_POLL_GETEV(&state.events, i);
-
- DBG("[rotation-thread] Handling fd (%i) activity (%u)",
- fd, revents);
-
- if (fd == handle->thread_quit_pipe) {
- DBG("[rotation-thread] Quit pipe activity");
- goto exit;
- } else if (fd == handle->ust32_consumer ||
- fd == handle->ust64_consumer ||
- fd == handle->kernel_consumer) {
- ret = handle_channel_rotation_pipe(fd,
- revents, handle, &state);
- if (ret) {
- ERR("[rotation-thread] Handle channel rotation pipe");
- goto error;
- }
- }
- }
- }
-exit:
-error:
- DBG("[rotation-thread] Exit");
- fini_thread_state(&state);
- health_unregister(health_sessiond);
- rcu_thread_offline();
- rcu_unregister_thread();
-end:
- return NULL;
-}
projects / lttng-tools.git / blobdiff