/*
* Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
- * Copyright (C) 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
+#include <sys/wait.h>
+#include <urcu/futex.h>
#include <unistd.h>
#include <ltt-kconsumerd.h>
#include "futex.h"
#include "kernel-ctl.h"
#include "ltt-sessiond.h"
+#include "shm.h"
#include "traceable-app.h"
#include "ust-ctl.h"
#include "utils.h"
-#include "ust-comm.h"
+#include "ust-ctl.h"
+
+#include "benchmark.h"
/* Const values */
const char default_home_dir[] = DEFAULT_HOME_DIR;
static char client_unix_sock_path[PATH_MAX]; /* Global client Unix socket path */
static char kconsumerd_err_unix_sock_path[PATH_MAX]; /* kconsumerd error Unix socket path */
static char kconsumerd_cmd_unix_sock_path[PATH_MAX]; /* kconsumerd command Unix socket path */
+static char wait_shm_path[PATH_MAX]; /* global wait shm path for UST */
/* Sockets and FDs */
static int client_sock;
static pthread_mutex_t kconsumerd_pid_mutex; /* Mutex to control kconsumerd pid assignation */
-static int modprobe_remove_kernel_modules(void);
-
/*
* UST registration command queue. This queue is tied with a futex and uses a N
* wakers / 1 waiter implemented and detailed in futex.c/.h
*/
static struct ltt_session_list *session_list_ptr;
+/*
+ * Remove modules in reverse load order.
+ */
+static int modprobe_remove_kernel_modules(void)
+{
+ int ret = 0, i;
+ char modprobe[256];
+
+ for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
+ ret = snprintf(modprobe, sizeof(modprobe),
+ "/sbin/modprobe --remove --quiet %s",
+ kernel_modules_list[i].name);
+ if (ret < 0) {
+ perror("snprintf modprobe --remove");
+ goto error;
+ }
+ modprobe[sizeof(modprobe) - 1] = '\0';
+ ret = system(modprobe);
+ if (ret == -1) {
+ ERR("Unable to launch modprobe --remove for module %s",
+ kernel_modules_list[i].name);
+ } else if (kernel_modules_list[i].required
+ && WEXITSTATUS(ret) != 0) {
+ ERR("Unable to remove module %s",
+ kernel_modules_list[i].name);
+ } else {
+ DBG("Modprobe removal successful %s",
+ kernel_modules_list[i].name);
+ }
+ }
+
+error:
+ return ret;
+}
+
+/*
+ * Return group ID of the tracing group or -1 if not found.
+ */
static gid_t allowed_group(void)
{
struct group *grp;
DBG("Cleaning up");
/* <fun> */
- MSG("\n%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm"
+ MSG("%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm"
"Matthew, BEET driven development works!%c[%dm",
27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
/* </fun> */
DBG("Closing kernel fd");
close(kernel_tracer_fd);
- DBG("Unloading kernel modules");
- modprobe_remove_kernel_modules();
+ if (is_root) {
+ DBG("Unloading kernel modules");
+ modprobe_remove_kernel_modules();
+ }
+
+ /* OUTPUT BENCHMARK RESULTS */
+ bench_init();
+
+ if (getenv("BENCH_UST_NOTIFY")) {
+ bench_print_ust_notification();
+ }
+
+ if (getenv("BENCH_UST_REGISTER")) {
+ bench_print_ust_register();
+ }
+
+ if (getenv("BENCH_BOOT_PROCESS")) {
+ bench_print_boot_process();
+ }
+
+ bench_close();
+ /* END BENCHMARK */
}
/*
return ret;
}
-#ifdef DISABLED
/*
- * Return a socket connected to the libust communication socket of the
- * application identified by the pid.
- *
- * If the pid is not found in the traceable list, return -1 to indicate error.
+ * Notify UST applications using the shm mmap futex.
*/
-static int ust_connect_app(pid_t pid)
+static int notify_ust_apps(int active)
{
- int sock;
- struct ltt_traceable_app *lta;
+ char *wait_shm_mmap;
- DBG("Connect to application pid %d", pid);
+ DBG("Notifying applications of session daemon state: %d", active);
- lta = find_app_by_pid(pid);
- if (lta == NULL) {
- /* App not found */
- DBG("Application pid %d not found", pid);
- return -1;
- }
+ tracepoint(ust_notify_apps_start);
- sock = ustctl_connect_pid(lta->pid);
- if (sock < 0) {
- ERR("Fail connecting to the PID %d", pid);
+ /* See shm.c for this call implying mmap, shm and futex calls */
+ wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
+ if (wait_shm_mmap == NULL) {
+ goto error;
}
- return sock;
-}
-
-/*
- * Notify apps by writing 42 to a named pipe using name. Every applications
- * waiting for a ltt-sessiond will be notified and re-register automatically to
- * the session daemon.
- *
- * Return open or write error value.
- */
-static int notify_apps(const char *name)
-{
- int fd;
- int ret = -1;
-
- DBG("Notify the global application pipe");
+ /* Wake waiting process */
+ futex_wait_update((int32_t *) wait_shm_mmap, active);
- /* Try opening the global pipe */
- fd = open(name, O_WRONLY);
- if (fd < 0) {
- goto error;
- }
+ tracepoint(ust_notify_apps_stop);
- /* Notify by writing on the pipe */
- ret = write(fd, "42", 2);
- if (ret < 0) {
- perror("write");
- }
+ /* Apps notified successfully */
+ return 0;
error:
- return ret;
+ return -1;
}
-#endif /* DISABLED */
/*
* Setup the outgoing data buffer for the response (llm) by allocating the
char tmp;
int update_poll_flag = 1;
+ tracepoint(sessiond_th_kern_start);
+
DBG("Thread manage kernel started");
while (1) {
DBG("Polling on %d fds", nb_fd);
+ tracepoint(sessiond_th_kern_poll);
+
/* Poll infinite value of time */
ret = poll(kernel_pollfd, nb_fd, -1);
if (ret < 0) {
enum lttcomm_return_code code;
struct pollfd pollfd[2];
+ tracepoint(sessiond_th_kcon_start);
+
DBG("[thread] Manage kconsumerd started");
ret = lttcomm_listen_unix_sock(kconsumerd_err_sock);
pollfd[1].fd = kconsumerd_err_sock;
pollfd[1].events = POLLIN;
+ tracepoint(sessiond_th_kcon_poll);
+
/* Inifinite blocking call, waiting for transmission */
ret = poll(pollfd, 2, -1);
if (ret < 0) {
*
* The first two fds must be there at all time.
*/
-static int update_apps_cmd_pollfd(unsigned int nb_fd, struct pollfd **pollfd)
+static int update_apps_cmd_pollfd(unsigned int nb_fd, unsigned int old_nb_fd,
+ struct pollfd **pollfd)
{
+ int i, count;
+ struct pollfd *old_pollfd = NULL;
+
/* Can't accept pollfd less than 2 */
if (nb_fd < 2) {
goto end;
}
- *pollfd = realloc(*pollfd, nb_fd * sizeof(struct pollfd));
+ if (*pollfd) {
+ /* Save pointer */
+ old_pollfd = *pollfd;
+ }
+
+ *pollfd = malloc(nb_fd * sizeof(struct pollfd));
if (*pollfd == NULL) {
- perror("realloc manage apps pollfd");
+ perror("malloc manage apps pollfd");
goto error;
}
(*pollfd)[1].fd = apps_cmd_pipe[0];
(*pollfd)[1].events = POLLIN;
+ /* Start count after the two pipes below */
+ count = 2;
+ for (i = 2; i < old_nb_fd; i++) {
+ /* Add to new pollfd */
+ if (old_pollfd[i].fd != -1) {
+ (*pollfd)[count].fd = old_pollfd[i].fd;
+ (*pollfd)[count].events = POLLHUP | POLLNVAL | POLLERR;
+ count++;
+ }
+
+ if (count > nb_fd) {
+ ERR("Updating poll fd wrong size");
+ goto error;
+ }
+ }
+
+ /* Destroy old pollfd */
+ free(old_pollfd);
+
DBG("Apps cmd pollfd realloc of size %d", nb_fd);
end:
return 0;
error:
+ /* Destroy old pollfd */
+ free(old_pollfd);
return -1;
}
-/*
- * Send registration done packet to the application.
- */
-static int send_ust_register_done(int sock)
-{
- struct lttcomm_ust_msg lum;
-
- DBG("Sending register done command to %d", sock);
-
- lum.cmd = LTTNG_UST_REGISTER_DONE;
- lum.handle = LTTNG_UST_ROOT_HANDLE;
-
- return ustcomm_send_command(sock, &lum);
-}
-
/*
* This thread manage application communication.
*/
static void *thread_manage_apps(void *data)
{
- int i, ret, count;
+ int i, ret, current_nb_fd;
unsigned int nb_fd = 2;
int update_poll_flag = 1;
struct pollfd *pollfd = NULL;
struct ust_command ust_cmd;
+ tracepoint(sessiond_th_apps_start);
+
DBG("[thread] Manage application started");
ust_cmd.sock = -1;
+ current_nb_fd = nb_fd;
while (1) {
/* See if we have a valid socket to add to pollfd */
/* The pollfd struct must be updated */
if (update_poll_flag) {
- ret = update_apps_cmd_pollfd(nb_fd, &pollfd);
+ ret = update_apps_cmd_pollfd(nb_fd, current_nb_fd, &pollfd);
if (ret < 0) {
/* malloc failed so we quit */
goto error;
}
+
if (ust_cmd.sock != -1) {
/* Update pollfd with the new UST socket */
DBG("Adding sock %d to apps cmd pollfd", ust_cmd.sock);
pollfd[nb_fd - 1].fd = ust_cmd.sock;
- pollfd[nb_fd - 1].events = POLLHUP | POLLNVAL;
+ pollfd[nb_fd - 1].events = POLLHUP | POLLNVAL | POLLERR;
ust_cmd.sock = -1;
}
}
DBG("Apps thread polling on %d fds", nb_fd);
+ tracepoint(sessiond_th_apps_poll);
+
/* Inifinite blocking call, waiting for transmission */
ret = poll(pollfd, nb_fd, -1);
if (ret < 0) {
/* Thread quit pipe has been closed. Killing thread. */
if (pollfd[0].revents == POLLNVAL) {
goto error;
- } else if (pollfd[1].revents == POLLERR) {
- ERR("Apps command pipe poll error");
- goto error;
- } else if (pollfd[1].revents == POLLIN) {
- /* Empty pipe */
- ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
- if (ret < 0 || ret < sizeof(ust_cmd)) {
- perror("read apps cmd pipe");
+ } else {
+ /* apps_cmd_pipe pipe events */
+ switch (pollfd[1].revents) {
+ case POLLERR:
+ ERR("Apps command pipe poll error");
goto error;
- }
+ case POLLIN:
+ tracepoint(ust_register_read_start);
- /* Register applicaton to the session daemon */
- ret = register_traceable_app(&ust_cmd.reg_msg, ust_cmd.sock);
- if (ret < 0) {
- /* Only critical ENOMEM error can be returned here */
- goto error;
- }
+ /* Empty pipe */
+ ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
+ if (ret < 0 || ret < sizeof(ust_cmd)) {
+ perror("read apps cmd pipe");
+ goto error;
+ }
- ret = send_ust_register_done(ust_cmd.sock);
- if (ret < 0) {
- /*
- * If the registration is not possible, we simply unregister
- * the apps and continue
- */
- unregister_traceable_app(ust_cmd.sock);
+ tracepoint(ust_register_read_stop);
+
+ tracepoint(ust_register_add_start);
+ /* Register applicaton to the session daemon */
+ ret = register_traceable_app(&ust_cmd.reg_msg, ust_cmd.sock);
+ if (ret < 0) {
+ /* Only critical ENOMEM error can be returned here */
+ goto error;
+ }
+ tracepoint(ust_register_add_stop);
+
+ tracepoint(ust_register_done_start);
+ ret = ustctl_register_done(ust_cmd.sock);
+ if (ret < 0) {
+ /*
+ * If the registration is not possible, we simply unregister
+ * the apps and continue
+ */
+ unregister_traceable_app(ust_cmd.sock);
+ }
+
+ tracepoint(ust_register_done_stop);
+ break;
}
}
- count = nb_fd;
- for (i = 2; i < count; i++) {
+ current_nb_fd = nb_fd;
+ for (i = 2; i < current_nb_fd; i++) {
/* Apps socket is closed/hungup */
switch (pollfd[i].revents) {
- case POLLNVAL:
+ case POLLERR:
case POLLHUP:
+ case POLLNVAL:
/* Pipe closed */
unregister_traceable_app(pollfd[i].fd);
+ /* Indicate to remove this fd from the pollfd */
+ pollfd[i].fd = -1;
nb_fd--;
+ break;
}
}
- if (nb_fd != count) {
+ if (nb_fd != current_nb_fd) {
update_poll_flag = 1;
}
}
struct cds_wfq_node *node;
struct ust_command *ust_cmd = NULL;
+ tracepoint(sessiond_th_dispatch_start);
+
DBG("[thread] Dispatch UST command started");
while (!dispatch_thread_exit) {
futex_nto1_prepare(&ust_cmd_queue.futex);
do {
+ tracepoint(sessiond_th_dispatch_block);
+
/* Dequeue command for registration */
node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
if (node == NULL) {
break;
}
+ tracepoint(ust_dispatch_register_start);
+
ust_cmd = caa_container_of(node, struct ust_command, node);
- DBG("Dispatching UST registration pid:%d sock:%d",
- ust_cmd->reg_msg.pid, ust_cmd->sock);
+ DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
+ " gid:%d sock:%d name:%s (version %d.%d)",
+ ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
+ ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
+ ust_cmd->sock, ust_cmd->reg_msg.name,
+ ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
/*
* Inform apps thread of the new application registration. This
* call is blocking so we can be assured that the data will be read
free(ust_cmd);
} while (node != NULL);
+ tracepoint(ust_dispatch_register_stop);
+
/* Futex wait on queue. Blocking call on futex() */
futex_nto1_wait(&ust_cmd_queue.futex);
}
*/
struct ust_command *ust_cmd = NULL;
+ tracepoint(sessiond_th_reg_start);
+
DBG("[thread] Manage application registration started");
ret = lttcomm_listen_unix_sock(apps_sock);
pollfd[1].events = POLLIN;
/* Notify all applications to register */
- //notify_apps(default_global_apps_pipe);
+ ret = notify_ust_apps(1);
+ if (ret < 0) {
+ ERR("Failed to notify applications or create the wait shared memory.\n"
+ "Execution continues but there might be problem for already running\n"
+ "applications that wishes to register.");
+ }
while (1) {
DBG("Accepting application registration");
+ tracepoint(sessiond_th_reg_poll);
+
/* Inifinite blocking call, waiting for transmission */
ret = poll(pollfd, 2, -1);
if (ret < 0) {
goto error;
}
+ /* Registration starts here. Recording cycles */
+ tracepoint(ust_register_start);
+
sock = lttcomm_accept_unix_sock(apps_sock);
if (sock < 0) {
goto error;
*/
ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
sizeof(struct ust_register_msg));
- if (ret < 0 || ret != sizeof(struct ust_register_msg)) {
- perror("lttcomm_recv_unix_sock register apps");
+ if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
+ if (ret < 0) {
+ perror("lttcomm_recv_unix_sock register apps");
+ } else {
+ ERR("Wrong size received on apps register");
+ }
free(ust_cmd);
close(sock);
continue;
ust_cmd->sock = sock;
+ DBG("UST registration received with pid:%d ppid:%d uid:%d"
+ " gid:%d sock:%d name:%s (version %d.%d)",
+ ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
+ ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
+ ust_cmd->sock, ust_cmd->reg_msg.name,
+ ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
/*
* Lock free enqueue the registration request.
* The red pill has been taken! This apps will be part of the *system*
*/
futex_nto1_wake(&ust_cmd_queue.futex);
- DBG("Thread manage apps informed of queued node with sock:%d pid:%d",
- sock, ust_cmd->reg_msg.pid);
+ tracepoint(ust_register_stop);
}
error:
- DBG("Register apps thread dying");
- if (apps_sock) {
- close(apps_sock);
- }
- if (sock) {
- close(sock);
- }
+ DBG("UST Registration thread dying");
+
+ /* Notify that the registration thread is gone */
+ notify_ust_apps(0);
+
+ close(apps_sock);
+ close(sock);
unlink(apps_unix_sock_path);
+
return NULL;
}
return ret;
}
-/*
- * modprobe_remove_kernel_modules
- * Remove modules in reverse load order.
- */
-static int modprobe_remove_kernel_modules(void)
-{
- int ret = 0, i;
- char modprobe[256];
-
- for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
- ret = snprintf(modprobe, sizeof(modprobe),
- "/sbin/modprobe --remove --quiet %s",
- kernel_modules_list[i].name);
- if (ret < 0) {
- perror("snprintf modprobe --remove");
- goto error;
- }
- modprobe[sizeof(modprobe) - 1] = '\0';
- ret = system(modprobe);
- if (ret == -1) {
- ERR("Unable to launch modprobe --remove for module %s",
- kernel_modules_list[i].name);
- } else if (kernel_modules_list[i].required
- && WEXITSTATUS(ret) != 0) {
- ERR("Unable to remove module %s",
- kernel_modules_list[i].name);
- } else {
- DBG("Modprobe removal successful %s",
- kernel_modules_list[i].name);
- }
- }
-
-error:
- return ret;
-}
-
/*
* mount_debugfs
*/
return NULL;
}
+/*
+ * Create an UST session and add it to the session ust list.
+ */
+static int create_ust_session(pid_t pid, struct ltt_session *session)
+{
+ int ret = -1;
+ struct ltt_ust_session *lus;
+
+ DBG("Creating UST session");
+
+ lus = trace_ust_create_session(session->path, pid);
+ if (lus == NULL) {
+ goto error;
+ }
+
+ ret = mkdir_recursive(lus->path, S_IRWXU | S_IRWXG,
+ geteuid(), allowed_group());
+ if (ret < 0) {
+ if (ret != -EEXIST) {
+ ERR("Trace directory creation error");
+ goto error;
+ }
+ }
+
+ /* Create session on the UST tracer */
+ ret = ustctl_create_session(lus);
+ if (ret < 0) {
+ goto error;
+ }
+
+ return 0;
+
+error:
+ free(lus);
+ return ret;
+}
+
/*
* Create a kernel tracer session then create the default channel.
*/
goto error;
}
}
-
/* Need a session for kernel command */
switch (cmd_ctx->lsm->cmd_type) {
case LTTNG_CALIBRATE:
ret = LTTCOMM_KERN_SESS_FAIL;
goto error;
}
-
/* Start the kernel consumer daemon */
-
if (kconsumerd_pid == 0 &&
cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
ret = start_kconsumerd();
}
}
break;
+ case LTTNG_DOMAIN_UST_PID:
+ break;
default:
break;
}
}
kernel_wait_quiescent(kernel_tracer_fd);
+ break;
+ case LTTNG_DOMAIN_UST_PID:
+
break;
default:
- /* TODO: Userspace tracing */
ret = LTTCOMM_NOT_IMPLEMENTED;
goto error;
}
goto setup_error;
}
+ tracepoint(create_session_start);
ret = create_session(cmd_ctx->lsm->session.name, cmd_ctx->lsm->session.path);
+ tracepoint(create_session_end);
if (ret < 0) {
if (ret == -EEXIST) {
ret = LTTCOMM_EXIST_SESS;
/* Clean kernel session teardown */
teardown_kernel_session(cmd_ctx->session);
+ tracepoint(destroy_session_start);
ret = destroy_session(cmd_ctx->lsm->session.name);
+ tracepoint(destroy_session_end);
if (ret < 0) {
ret = LTTCOMM_FATAL;
goto error;
nb_dom++;
}
- nb_dom += cmd_ctx->session->ust_trace_count;
+ nb_dom += cmd_ctx->session->ust_session_list.count;
ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_domain) * nb_dom);
if (ret < 0) {
struct command_ctx *cmd_ctx = NULL;
struct pollfd pollfd[2];
+ tracepoint(sessiond_th_cli_start);
+
DBG("[thread] Manage client started");
ret = lttcomm_listen_unix_sock(client_sock);
while (1) {
DBG("Accepting client command ...");
+ tracepoint(sessiond_th_cli_poll);
+
/* Inifinite blocking call, waiting for transmission */
ret = poll(pollfd, 2, -1);
if (ret < 0) {
void *status;
const char *home_path;
+ tracepoint(sessiond_boot_start);
+
/* Create thread quit pipe */
if ((ret = init_thread_quit_pipe()) < 0) {
goto error;
snprintf(client_unix_sock_path, PATH_MAX,
DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
}
+
+ /* Set global SHM for ust */
+ if (strlen(wait_shm_path) == 0) {
+ snprintf(wait_shm_path, PATH_MAX,
+ DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
+ }
} else {
home_path = get_home_dir();
if (home_path == NULL) {
snprintf(client_unix_sock_path, PATH_MAX,
DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
}
+
+ /* Set global SHM for ust */
+ if (strlen(wait_shm_path) == 0) {
+ snprintf(wait_shm_path, PATH_MAX,
+ DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
+ }
}
DBG("Client socket path %s", client_unix_sock_path);
goto exit_kernel;
}
+ tracepoint(sessiond_boot_end);
+
ret = pthread_join(kernel_thread, &status);
if (ret != 0) {
perror("pthread_join");
projects / lttng-tools.git / blobdiff