X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fmanage-kernel.c;fp=src%2Fbin%2Flttng-sessiond%2Fmanage-kernel.c;h=0000000000000000000000000000000000000000;hb=7966af5763c4aaca39df9bbfa9277ff15715c720;hp=55ecbf8b3aeae8efec377f764acf0826765c4f3b;hpb=3a5f70173aa04d11ccb22694d5d31a702cad33ab;p=lttng-tools.git diff --git a/src/bin/lttng-sessiond/manage-kernel.c b/src/bin/lttng-sessiond/manage-kernel.c deleted file mode 100644 index 55ecbf8b3..000000000 --- a/src/bin/lttng-sessiond/manage-kernel.c +++ /dev/null @@ -1,360 +0,0 @@ -/* - * Copyright (C) 2011 David Goulet - * Copyright (C) 2011 Mathieu Desnoyers - * Copyright (C) 2013 Jérémie Galarneau - * - * SPDX-License-Identifier: GPL-2.0-only - * - */ - -#include -#include - -#include "manage-kernel.h" -#include "testpoint.h" -#include "health-sessiond.h" -#include "utils.h" -#include "thread.h" -#include "kernel.h" -#include "kernel-consumer.h" - -struct thread_notifiers { - struct lttng_pipe *quit_pipe; - int kernel_poll_pipe_read_fd; -}; - -/* - * Update the kernel poll set of all channel fd available over all tracing - * session. Add the wakeup pipe at the end of the set. - */ -static int update_kernel_poll(struct lttng_poll_event *events) -{ - int ret; - struct ltt_kernel_channel *channel; - struct ltt_session *session; - const struct ltt_session_list *session_list = session_get_list(); - - DBG("Updating kernel poll set"); - - session_lock_list(); - cds_list_for_each_entry(session, &session_list->head, list) { - if (!session_get(session)) { - continue; - } - session_lock(session); - if (session->kernel_session == NULL) { - session_unlock(session); - session_put(session); - continue; - } - - cds_list_for_each_entry(channel, - &session->kernel_session->channel_list.head, list) { - /* Add channel fd to the kernel poll set */ - ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); - if (ret < 0) { - session_unlock(session); - session_put(session); - goto error; - } - DBG("Channel fd %d added to kernel set", channel->fd); - } - session_unlock(session); - session_put(session); - } - session_unlock_list(); - - return 0; - -error: - session_unlock_list(); - return -1; -} - -/* - * Find the channel fd from 'fd' over all tracing session. When found, check - * for new channel stream and send those stream fds to the kernel consumer. - * - * Useful for CPU hotplug feature. - */ -static int update_kernel_stream(int fd) -{ - int ret = 0; - struct ltt_session *session; - struct ltt_kernel_session *ksess; - struct ltt_kernel_channel *channel; - const struct ltt_session_list *session_list = session_get_list(); - - DBG("Updating kernel streams for channel fd %d", fd); - - session_lock_list(); - cds_list_for_each_entry(session, &session_list->head, list) { - if (!session_get(session)) { - continue; - } - session_lock(session); - if (session->kernel_session == NULL) { - session_unlock(session); - session_put(session); - continue; - } - ksess = session->kernel_session; - - cds_list_for_each_entry(channel, - &ksess->channel_list.head, list) { - struct lttng_ht_iter iter; - struct consumer_socket *socket; - - if (channel->fd != fd) { - continue; - } - DBG("Channel found, updating kernel streams"); - ret = kernel_open_channel_stream(channel); - if (ret < 0) { - goto error; - } - /* Update the stream global counter */ - ksess->stream_count_global += ret; - - /* - * Have we already sent fds to the consumer? If yes, it - * means that tracing is started so it is safe to send - * our updated stream fds. - */ - if (ksess->consumer_fds_sent != 1 - || ksess->consumer == NULL) { - ret = -1; - goto error; - } - - rcu_read_lock(); - cds_lfht_for_each_entry(ksess->consumer->socks->ht, - &iter.iter, socket, node.node) { - pthread_mutex_lock(socket->lock); - ret = kernel_consumer_send_channel_streams(socket, - channel, ksess, - session->output_traces ? 1 : 0); - pthread_mutex_unlock(socket->lock); - if (ret < 0) { - rcu_read_unlock(); - goto error; - } - } - rcu_read_unlock(); - } - session_unlock(session); - session_put(session); - } - session_unlock_list(); - return ret; - -error: - session_unlock(session); - session_put(session); - session_unlock_list(); - return ret; -} - -/* - * This thread manage event coming from the kernel. - * - * Features supported in this thread: - * -) CPU Hotplug - */ -static void *thread_kernel_management(void *data) -{ - int ret, i, pollfd, update_poll_flag = 1, err = -1; - uint32_t revents, nb_fd; - char tmp; - struct lttng_poll_event events; - struct thread_notifiers *notifiers = data; - const int quit_pipe_read_fd = lttng_pipe_get_readfd(notifiers->quit_pipe); - - DBG("[thread] Thread manage kernel started"); - - health_register(the_health_sessiond, HEALTH_SESSIOND_TYPE_KERNEL); - - /* - * This first step of the while is to clean this structure which could free - * non NULL pointers so initialize it before the loop. - */ - lttng_poll_init(&events); - - if (testpoint(sessiond_thread_manage_kernel)) { - goto error_testpoint; - } - - health_code_update(); - - if (testpoint(sessiond_thread_manage_kernel_before_loop)) { - goto error_testpoint; - } - - while (1) { - health_code_update(); - - if (update_poll_flag == 1) { - /* Clean events object. We are about to populate it again. */ - lttng_poll_clean(&events); - - ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); - if (ret < 0) { - goto error_poll_create; - } - - ret = lttng_poll_add(&events, - notifiers->kernel_poll_pipe_read_fd, - LPOLLIN); - if (ret < 0) { - goto error; - } - - ret = lttng_poll_add(&events, - quit_pipe_read_fd, - LPOLLIN); - if (ret < 0) { - goto error; - } - - /* This will add the available kernel channel if any. */ - ret = update_kernel_poll(&events); - if (ret < 0) { - goto error; - } - update_poll_flag = 0; - } - - DBG("Thread kernel polling"); - - /* Poll infinite value of time */ - restart: - health_poll_entry(); - ret = lttng_poll_wait(&events, -1); - DBG("Thread kernel return from poll on %d fds", - LTTNG_POLL_GETNB(&events)); - health_poll_exit(); - if (ret < 0) { - /* - * Restart interrupted system call. - */ - if (errno == EINTR) { - goto restart; - } - goto error; - } else if (ret == 0) { - /* Should not happen since timeout is infinite */ - ERR("Return value of poll is 0 with an infinite timeout.\n" - "This should not have happened! Continuing..."); - continue; - } - - nb_fd = ret; - - for (i = 0; i < nb_fd; i++) { - /* Fetch once the poll data */ - revents = LTTNG_POLL_GETEV(&events, i); - pollfd = LTTNG_POLL_GETFD(&events, i); - - health_code_update(); - - if (pollfd == quit_pipe_read_fd) { - err = 0; - goto exit; - } - - /* Check for data on kernel pipe */ - if (revents & LPOLLIN) { - if (pollfd == notifiers->kernel_poll_pipe_read_fd) { - (void) lttng_read(notifiers->kernel_poll_pipe_read_fd, - &tmp, 1); - /* - * Ret value is useless here, if this pipe gets any actions an - * update is required anyway. - */ - update_poll_flag = 1; - continue; - } else { - /* - * New CPU detected by the kernel. Adding kernel stream to - * kernel session and updating the kernel consumer - */ - ret = update_kernel_stream(pollfd); - if (ret < 0) { - continue; - } - break; - } - } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { - update_poll_flag = 1; - continue; - } else { - ERR("Unexpected poll events %u for sock %d", revents, pollfd); - goto error; - } - } - } - -exit: -error: - lttng_poll_clean(&events); -error_poll_create: -error_testpoint: - if (err) { - health_error(); - ERR("Health error occurred in %s", __func__); - WARN("Kernel thread died unexpectedly. " - "Kernel tracing can continue but CPU hotplug is disabled."); - } - health_unregister(the_health_sessiond); - DBG("Kernel thread dying"); - return NULL; -} - -static bool shutdown_kernel_management_thread(void *data) -{ - struct thread_notifiers *notifiers = data; - const int write_fd = lttng_pipe_get_writefd(notifiers->quit_pipe); - - return notify_thread_pipe(write_fd) == 1; -} - -static void cleanup_kernel_management_thread(void *data) -{ - struct thread_notifiers *notifiers = data; - - lttng_pipe_destroy(notifiers->quit_pipe); - free(notifiers); -} - -bool launch_kernel_management_thread(int kernel_poll_pipe_read_fd) -{ - struct lttng_pipe *quit_pipe; - struct thread_notifiers *notifiers = NULL; - struct lttng_thread *thread; - - notifiers = zmalloc(sizeof(*notifiers)); - if (!notifiers) { - goto error_alloc; - } - quit_pipe = lttng_pipe_open(FD_CLOEXEC); - if (!quit_pipe) { - goto error; - } - notifiers->quit_pipe = quit_pipe; - notifiers->kernel_poll_pipe_read_fd = kernel_poll_pipe_read_fd; - - thread = lttng_thread_create("Kernel management", - thread_kernel_management, - shutdown_kernel_management_thread, - cleanup_kernel_management_thread, - notifiers); - if (!thread) { - goto error; - } - lttng_thread_put(thread); - return true; -error: - cleanup_kernel_management_thread(notifiers); -error_alloc: - return false; -}