lttng/save.h \
lttng/load.h \
lttng/endpoint.h \
+ lttng/rotation.h \
version.h.tmpl
lttngactioninclude_HEADERS= \
--- /dev/null
+/*
+ * Copyright (C) 2017 - Julien Desfossez <jdesfossez@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, version 2.1 only,
+ * as published by the Free Software Foundation.
+ *
+ * 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
+ */
+
+#ifndef LTTNG_ROTATION_H
+#define LTTNG_ROTATION_H
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * Return codes for lttng_rotate_session_get_output_path.
+ */
+enum lttng_rotation_status {
+ /*
+ * After starting a rotation.
+ */
+ LTTNG_ROTATION_STATUS_STARTED = 0,
+ /*
+ * When the rotation is complete.
+ */
+ LTTNG_ROTATION_STATUS_COMPLETED = 1,
+ /*
+ * If the handle does not match the last rotate command, we cannot
+ * retrieve the path for the chunk.
+ */
+ LTTNG_ROTATION_STATUS_EXPIRED = 2,
+ /*
+ * On error.
+ */
+ LTTNG_ROTATION_STATUS_ERROR = 3,
+ /*
+ * If no rotation occured during this session.
+ */
+ LTTNG_ROTATION_STATUS_NO_ROTATION = 4,
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LTTNG_ROTATION_H */
notification-thread.h notification-thread.c \
notification-thread-commands.h notification-thread-commands.c \
notification-thread-events.h notification-thread-events.c \
- sessiond-config.h sessiond-config.c
+ sessiond-config.h sessiond-config.c \
+ rotate.h rotate.c \
+ rotation-thread.h rotation-thread.c
if HAVE_LIBLTTNG_UST_CTL
lttng_sessiond_SOURCES += trace-ust.c ust-registry.c ust-app.c \
HEALTH_SESSIOND_TYPE_APP_MANAGE_NOTIFY = 6,
HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH = 7,
HEALTH_SESSIOND_TYPE_NOTIFICATION = 8,
+ HEALTH_SESSIOND_TYPE_ROTATION = 9,
NR_HEALTH_SESSIOND_TYPES,
};
#include "load-session-thread.h"
#include "notification-thread.h"
#include "notification-thread-commands.h"
+#include "rotation-thread.h"
#include "syscall.h"
#include "agent.h"
#include "ht-cleanup.h"
static pthread_t agent_reg_thread;
static pthread_t load_session_thread;
static pthread_t notification_thread;
+static pthread_t rotation_thread;
/*
* UST registration command queue. This queue is tied with a futex and uses a N
/* Notification thread handle. */
struct notification_thread_handle *notification_thread_handle;
+/* Rotation thread handle. */
+struct rotation_thread_handle *rotation_thread_handle;
+
/* Global hash tables */
struct lttng_ht *agent_apps_ht_by_sock = NULL;
* NR_LTTNG_SESSIOND_READY must match the number of calls to
* sessiond_notify_ready().
*/
-#define NR_LTTNG_SESSIOND_READY 4
+#define NR_LTTNG_SESSIOND_READY 5
int lttng_sessiond_ready = NR_LTTNG_SESSIOND_READY;
int sessiond_check_thread_quit_pipe(int fd, uint32_t events)
*ust64_channel_monitor_pipe = NULL,
*kernel_channel_monitor_pipe = NULL;
bool notification_thread_running = false;
+ bool rotation_thread_running = false;
struct lttng_pipe *ust32_channel_rotate_pipe = NULL,
*ust64_channel_rotate_pipe = NULL,
*kernel_channel_rotate_pipe = NULL;
}
notification_thread_running = true;
+ /* rotation_thread_data acquires the pipes' read side. */
+ rotation_thread_handle = rotation_thread_handle_create(
+ ust32_channel_rotate_pipe,
+ ust64_channel_rotate_pipe,
+ kernel_channel_rotate_pipe,
+ thread_quit_pipe[0]);
+ if (!rotation_thread_handle) {
+ retval = -1;
+ ERR("Failed to create rotation thread shared data");
+ stop_threads();
+ goto exit_rotation;
+ }
+ rotation_thread_running = true;
+
+ /* Create rotation thread. */
+ ret = pthread_create(&rotation_thread, default_pthread_attr(),
+ thread_rotation, rotation_thread_handle);
+ if (ret) {
+ errno = ret;
+ PERROR("pthread_create rotation");
+ retval = -1;
+ stop_threads();
+ goto exit_rotation;
+ }
+
/* Create thread to manage the client socket */
ret = pthread_create(&client_thread, default_pthread_attr(),
thread_manage_clients, (void *) NULL);
}
exit_client:
+exit_rotation:
exit_notification:
ret = pthread_join(health_thread, &status);
if (ret) {
notification_thread_handle_destroy(notification_thread_handle);
}
+ if (rotation_thread_handle) {
+ if (rotation_thread_running) {
+ ret = pthread_join(rotation_thread, &status);
+ if (ret) {
+ errno = ret;
+ PERROR("pthread_join rotation thread");
+ retval = -1;
+ }
+ }
+ rotation_thread_handle_destroy(rotation_thread_handle);
+ }
+
rcu_thread_offline();
rcu_unregister_thread();
--- /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 <common/kernel-ctl/kernel-ctl.h>
+#include <sys/eventfd.h>
+#include <sys/stat.h>
+#include <time.h>
+#include <signal.h>
+#include <inttypes.h>
+
+#include "session.h"
+#include "rotate.h"
+#include "rotation-thread.h"
+#include "lttng-sessiond.h"
+#include "health-sessiond.h"
+#include "cmd.h"
+#include "utils.h"
+
+#include <urcu.h>
+#include <urcu/list.h>
+#include <urcu/rculfhash.h>
+
+unsigned long hash_channel_key(struct rotation_channel_key *key)
+{
+ return hash_key_u64(&key->key, lttng_ht_seed) ^ hash_key_ulong(
+ (void *) (unsigned long) key->domain, lttng_ht_seed);
+}
+
+/* The session's lock must be held by the caller. */
+static
+int session_rename_chunk(struct ltt_session *session, char *current_path,
+ char *new_path)
+{
+ int ret;
+ struct consumer_socket *socket;
+ struct consumer_output *output;
+ struct lttng_ht_iter iter;
+ uid_t uid;
+ gid_t gid;
+
+ DBG("Renaming session chunk path of session \"%s\" from %s to %s",
+ session->name, current_path, new_path);
+
+ /*
+ * Either one of the sessions is enough to find the consumer_output
+ * and uid/gid.
+ */
+ if (session->kernel_session) {
+ output = session->kernel_session->consumer;
+ uid = session->kernel_session->uid;
+ gid = session->kernel_session->gid;
+ } else if (session->ust_session) {
+ output = session->ust_session->consumer;
+ uid = session->ust_session->uid;
+ gid = session->ust_session->gid;
+ } else {
+ assert(0);
+ }
+
+ if (!output || !output->socks) {
+ ERR("No consumer output found for session \"%s\"",
+ session->name);
+ ret = -1;
+ goto end;
+ }
+
+ rcu_read_lock();
+ /*
+ * We have to iterate to find a socket, but we only need to send the
+ * rename command to one consumer, so we break after the first one.
+ */
+ cds_lfht_for_each_entry(output->socks->ht, &iter.iter, socket, node.node) {
+ pthread_mutex_lock(socket->lock);
+ ret = consumer_rotate_rename(socket, session->id, output,
+ current_path, new_path, uid, gid);
+ pthread_mutex_unlock(socket->lock);
+ if (ret) {
+ ret = -1;
+ goto end_unlock;
+ }
+ break;
+ }
+
+ ret = 0;
+
+end_unlock:
+ rcu_read_unlock();
+end:
+ return ret;
+}
+
+/* The session's lock must be held by the caller. */
+static
+int rename_first_chunk(struct ltt_session *session,
+ struct consumer_output *consumer, char *new_path)
+{
+ int ret;
+ char current_full_path[LTTNG_PATH_MAX], new_full_path[LTTNG_PATH_MAX];
+
+ /* Current domain path: <session>/kernel */
+ if (session->net_handle > 0) {
+ ret = snprintf(current_full_path, sizeof(current_full_path), "%s/%s",
+ consumer->dst.net.base_dir, consumer->subdir);
+ if (ret < 0 || ret >= sizeof(current_full_path)) {
+ ERR("Failed to initialize current full path while renaming first rotation chunk of session \"%s\"",
+ session->name);
+ ret = -1;
+ goto error;
+ }
+ } else {
+ ret = snprintf(current_full_path, sizeof(current_full_path), "%s/%s",
+ consumer->dst.session_root_path, consumer->subdir);
+ if (ret < 0 || ret >= sizeof(current_full_path)) {
+ ERR("Failed to initialize current full path while renaming first rotation chunk of session \"%s\"",
+ session->name);
+ ret = -1;
+ goto error;
+ }
+ }
+ /* New domain path: <session>/<start-date>-<end-date>-<rotate-count>/kernel */
+ ret = snprintf(new_full_path, sizeof(new_full_path), "%s/%s",
+ new_path, consumer->subdir);
+ if (ret < 0 || ret >= sizeof(new_full_path)) {
+ ERR("Failed to initialize new full path while renaming first rotation chunk of session \"%s\"",
+ session->name);
+ ret = -1;
+ goto error;
+ }
+ /*
+ * Move the per-domain fcurrenter inside the first rotation
+ * fcurrenter.
+ */
+ ret = session_rename_chunk(session, current_full_path, new_full_path);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_UNK;
+ goto error;
+ }
+
+ ret = 0;
+
+error:
+ return ret;
+}
+
+/*
+ * Rename a chunk folder after a rotation is complete.
+ * session_lock_list and session lock must be held.
+ *
+ * Returns 0 on success, a negative value on error.
+ */
+int rename_complete_chunk(struct ltt_session *session, time_t ts)
+{
+ struct tm *timeinfo;
+ char datetime[16], start_datetime[16];
+ char new_path[LTTNG_PATH_MAX];
+ int ret;
+ size_t strf_ret;
+
+ DBG("Renaming completed chunk for session %s", session->name);
+ timeinfo = localtime(&ts);
+ if (!timeinfo) {
+ ERR("Failed to retrieve local time while renaming completed chunk");
+ ret = -1;
+ goto end;
+ }
+ strf_ret = strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S",
+ timeinfo);
+ if (strf_ret == 0) {
+ ERR("Failed to format timestamp while renaming completed session chunk");
+ ret = -1;
+ goto end;
+ }
+
+ if (session->rotate_count == 1) {
+ char start_time[16];
+
+ timeinfo = localtime(&session->last_chunk_start_ts);
+ if (!timeinfo) {
+ ERR("Failed to retrieve local time while renaming completed chunk");
+ ret = -1;
+ goto end;
+ }
+
+ strf_ret = strftime(start_time, sizeof(start_time),
+ "%Y%m%d-%H%M%S", timeinfo);
+ if (strf_ret == 0) {
+ ERR("Failed to format timestamp while renaming completed session chunk");
+ ret = -1;
+ goto end;
+ }
+
+ /*
+ * On the first rotation, the current_rotate_path is the
+ * session_root_path, so we need to create the chunk folder
+ * and move the domain-specific folders inside it.
+ */
+ ret = snprintf(new_path, sizeof(new_path), "%s/%s-%s-%" PRIu64,
+ session->rotation_chunk.current_rotate_path,
+ start_time,
+ datetime, session->rotate_count);
+ if (ret < 0 || ret >= sizeof(new_path)) {
+ ERR("Failed to format new chunk path while renaming session \"%s\"'s first chunk",
+ session->name);
+ ret = -1;
+ goto end;
+ }
+
+ if (session->kernel_session) {
+ ret = rename_first_chunk(session,
+ session->kernel_session->consumer,
+ new_path);
+ if (ret) {
+ ERR("Failed to rename kernel session trace folder to %s", new_path);
+ /*
+ * This is not a fatal error for the rotation
+ * thread, we just need to inform the client
+ * that a problem occurred with the rotation.
+ * Returning 0, same for the other errors
+ * below.
+ */
+ ret = 0;
+ goto error;
+ }
+ }
+ if (session->ust_session) {
+ ret = rename_first_chunk(session,
+ session->ust_session->consumer,
+ new_path);
+ if (ret) {
+ ERR("Failed to rename userspace session trace folder to %s", new_path);
+ ret = 0;
+ goto error;
+ }
+ }
+ } else {
+ /*
+ * After the first rotation, all the trace data is already in
+ * its own chunk folder, we just need to append the suffix.
+ */
+ /* Recreate the session->rotation_chunk.current_rotate_path */
+ timeinfo = localtime(&session->last_chunk_start_ts);
+ if (!timeinfo) {
+ ERR("Failed to retrieve local time while renaming completed chunk");
+ ret = -1;
+ goto end;
+ }
+ strf_ret = strftime(start_datetime, sizeof(start_datetime), "%Y%m%d-%H%M%S", timeinfo);
+ if (!strf_ret) {
+ ERR("Failed to format timestamp while renaming completed session chunk");
+ ret = -1;
+ goto end;
+ }
+ ret = snprintf(new_path, sizeof(new_path), "%s/%s-%s-%" PRIu64,
+ session_get_base_path(session),
+ start_datetime,
+ datetime, session->rotate_count);
+ if (ret < 0 || ret >= sizeof(new_path)) {
+ ERR("Failed to format new chunk path while renaming chunk of session \"%s\"",
+ session->name);
+ ret = -1;
+ goto error;
+ }
+ ret = session_rename_chunk(session,
+ session->rotation_chunk.current_rotate_path,
+ new_path);
+ if (ret) {
+ ERR("Failed to rename session trace folder from %s to %s",
+ session->rotation_chunk.current_rotate_path,
+ new_path);
+ ret = 0;
+ goto error;
+ }
+ }
+
+ /*
+ * Store the path where the readable chunk is. This path is valid
+ * and can be queried by the client with rotate_pending until the next
+ * rotation is started.
+ */
+ ret = lttng_strncpy(session->rotation_chunk.current_rotate_path,
+ new_path,
+ sizeof(session->rotation_chunk.current_rotate_path));
+ if (ret) {
+ ERR("Failed the current chunk's path of session \"%s\"",
+ session->name);
+ ret = -1;
+ goto error;
+ }
+
+ goto end;
+
+error:
+ session->rotation_status = LTTNG_ROTATION_STATUS_ERROR;
+end:
+ return ret;
+}
--- /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.
+ */
+
+#ifndef ROTATE_H
+#define ROTATE_H
+
+#include "rotation-thread.h"
+
+/*
+ * Key in channel_pending_rotate_ht to map a channel to a
+ * struct rotation_channel_info.
+ */
+struct rotation_channel_key {
+ uint64_t key;
+ enum lttng_domain_type domain;
+};
+
+/*
+ * Added in channel_pending_rotate_ht everytime we start the rotation of a
+ * channel. The consumer notifies the rotation thread with the channel_key to
+ * inform a rotation is complete, we use that information to lookup the related
+ * session from channel_pending_rotate_ht.
+ */
+struct rotation_channel_info {
+ uint64_t session_id;
+ struct rotation_channel_key channel_key;
+ struct cds_lfht_node rotate_channels_ht_node;
+};
+
+extern struct cds_lfht *channel_pending_rotate_ht;
+
+unsigned long hash_channel_key(struct rotation_channel_key *key);
+
+/* session lock must be held by this function's caller. */
+int rename_complete_chunk(struct ltt_session *session, time_t ts);
+
+#endif /* ROTATE_H */
--- /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 "rotation-thread.h"
+#include "lttng-sessiond.h"
+#include "health-sessiond.h"
+#include "rotate.h"
+#include "cmd.h"
+#include "session.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_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;
+
+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 4:
+ * - sessiond quit 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, 4, 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, 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;
+}
--- /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.
+ */
+
+#ifndef ROTATION_THREAD_H
+#define ROTATION_THREAD_H
+
+#include <urcu/list.h>
+#include <urcu.h>
+#include <urcu/rculfhash.h>
+#include <lttng/domain.h>
+#include <common/pipe.h>
+#include <common/compat/poll.h>
+#include <common/hashtable/hashtable.h>
+#include <pthread.h>
+#include "session.h"
+
+struct rotation_thread_handle {
+ /*
+ * Read side of pipes used to communicate with the rotation thread.
+ */
+ /* Notification from the consumers */
+ int ust32_consumer;
+ int ust64_consumer;
+ int kernel_consumer;
+ /* quit pipe */
+ int thread_quit_pipe;
+};
+
+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);
+
+void rotation_thread_handle_destroy(
+ struct rotation_thread_handle *handle);
+
+void *thread_rotation(void *data);
+
+#endif /* ROTATION_THREAD_H */
#include <urcu/list.h>
#include <common/hashtable/hashtable.h>
+#include <lttng/rotation.h>
#include "snapshot.h"
#include "trace-kernel.h"
* Node in ltt_sessions_ht_by_id.
*/
struct lttng_ht_node_u64 node;
+ /* Number of session rotation for this session. */
+ uint64_t rotate_count;
+ /*
+ * Rotation is pending between the time it starts until the consumer has
+ * finished extracting the data. If the session uses a relay, data related
+ * to a rotation can still be in flight after that, see
+ * rotate_pending_relay.
+ */
+ bool rotate_pending;
+ /* Current status of a rotation. */
+ enum lttng_rotation_status rotation_status;
+ /*
+ * Number of channels waiting for a rotation.
+ * When this number reaches 0, we can handle the rename of the chunk
+ * folder and inform the client that the rotate is finished.
+ */
+ unsigned int nr_chan_rotate_pending;
+ struct {
+ /*
+ * When the rotation is in progress, the temporary path name is
+ * stored here. When the rotation is complete, the final path name
+ * is here and can be queried with the rotate_pending call.
+ */
+ char current_rotate_path[LTTNG_PATH_MAX];
+ /*
+ * The path where the consumer is currently writing after the first
+ * session rotation.
+ */
+ char active_tracing_path[LTTNG_PATH_MAX];
+ } rotation_chunk;
+ /*
+ * The timestamp of the beginning of the previous chunk. For the
+ * first chunk, this is the "lttng start" timestamp. For the
+ * subsequent ones, this copies the current_chunk_start_ts value when
+ * a new rotation starts. This value is used to set the name of a
+ * complete chunk directory, ex: "last_chunk_start_ts-now()".
+ */
+ time_t last_chunk_start_ts;
+ /*
+ * This is the timestamp when a new chunk starts. When a new rotation
+ * starts, we copy this value to last_chunk_start_ts and replace it
+ * with the current timestamp.
+ */
+ time_t current_chunk_start_ts;
};
/* Prototypes */
[ HEALTH_SESSIOND_TYPE_HT_CLEANUP ] = "Session daemon hash table cleanup",
[ HEALTH_SESSIOND_TYPE_APP_MANAGE_NOTIFY ] = "Session daemon application notification manager",
[ HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH ] = "Session daemon application registration dispatcher",
+ [ HEALTH_SESSIOND_TYPE_ROTATION ] = "Session daemon rotation manager",
};
static
projects / lttng-tools.git / commitdiff
