X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fkernel.c;h=32c40531d21b3e50f4d7b1851594b2ad1090ea4f;hp=dd815c44536fd8629d01537d6a6d749f70033147;hb=0525e9ae15d215943d8187e7f190d5a45e723085;hpb=4222434939b65c3abf144866564732d7fd14ed13 diff --git a/src/bin/lttng-sessiond/kernel.c b/src/bin/lttng-sessiond/kernel.c index dd815c445..32c40531d 100644 --- a/src/bin/lttng-sessiond/kernel.c +++ b/src/bin/lttng-sessiond/kernel.c @@ -22,11 +22,13 @@ #include #include #include +#include #include #include #include +#include "consumer.h" #include "kernel.h" #include "kern-modules.h" @@ -38,6 +40,9 @@ int kernel_add_channel_context(struct ltt_kernel_channel *chan, { int ret; + assert(chan); + assert(ctx); + DBG("Adding context to channel %s", chan->channel->name); ret = kernctl_add_context(chan->fd, ctx); if (ret < 0) { @@ -64,35 +69,6 @@ error: return ret; } -/* - * Add context on a kernel event. - */ -int kernel_add_event_context(struct ltt_kernel_event *event, - struct lttng_kernel_context *ctx) -{ - int ret; - - DBG("Adding context to event %s", event->event->name); - ret = kernctl_add_context(event->fd, ctx); - if (ret < 0) { - PERROR("add context ioctl"); - goto error; - } - - event->ctx = zmalloc(sizeof(struct lttng_kernel_context)); - if (event->ctx == NULL) { - PERROR("zmalloc event context"); - goto error; - } - - memcpy(event->ctx, ctx, sizeof(struct lttng_kernel_context)); - - return 0; - -error: - return ret; -} - /* * Create a new kernel session, register it to the kernel tracer and add it to * the session daemon session. @@ -102,6 +78,8 @@ int kernel_create_session(struct ltt_session *session, int tracer_fd) int ret; struct ltt_kernel_session *lks; + assert(session); + /* Allocate data structure */ lks = trace_kernel_create_session(session->path); if (lks == NULL) { @@ -123,6 +101,7 @@ int kernel_create_session(struct ltt_session *session, int tracer_fd) PERROR("fcntl session fd"); } + lks->id = session->id; lks->consumer_fds_sent = 0; session->kernel_session = lks; @@ -144,12 +123,22 @@ int kernel_create_channel(struct ltt_kernel_session *session, int ret; struct ltt_kernel_channel *lkc; + assert(session); + assert(chan); + assert(path); + /* Allocate kernel channel */ lkc = trace_kernel_create_channel(chan, path); if (lkc == NULL) { goto error; } + DBG3("Kernel create channel %s in %s with attr: %d, %" PRIu64 ", %" PRIu64 ", %u, %u, %d", + chan->name, path, lkc->channel->attr.overwrite, + lkc->channel->attr.subbuf_size, lkc->channel->attr.num_subbuf, + lkc->channel->attr.switch_timer_interval, lkc->channel->attr.read_timer_interval, + lkc->channel->attr.output); + /* Kernel tracer channel creation */ ret = kernctl_create_channel(session->fd, &lkc->channel->attr); if (ret < 0) { @@ -168,9 +157,9 @@ int kernel_create_channel(struct ltt_kernel_session *session, /* Add channel to session */ cds_list_add(&lkc->list, &session->channel_list.head); session->channel_count++; + lkc->session = session; - DBG("Kernel channel %s created (fd: %d and path: %s)", - lkc->channel->name, lkc->fd, lkc->pathname); + DBG("Kernel channel %s created (fd: %d)", lkc->channel->name, lkc->fd); return 0; @@ -188,6 +177,9 @@ int kernel_create_event(struct lttng_event *ev, int ret; struct ltt_kernel_event *event; + assert(ev); + assert(channel); + event = trace_kernel_create_event(ev); if (event == NULL) { ret = -1; @@ -196,7 +188,13 @@ int kernel_create_event(struct lttng_event *ev, ret = kernctl_create_event(channel->fd, event->event); if (ret < 0) { - if (errno != EEXIST) { + switch (errno) { + case EEXIST: + break; + case ENOSYS: + WARN("Event type not implemented"); + break; + default: PERROR("create event ioctl"); } ret = -errno; @@ -245,6 +243,8 @@ int kernel_disable_channel(struct ltt_kernel_channel *chan) { int ret; + assert(chan); + ret = kernctl_disable(chan->fd); if (ret < 0) { PERROR("disable chan ioctl"); @@ -268,6 +268,8 @@ int kernel_enable_channel(struct ltt_kernel_channel *chan) { int ret; + assert(chan); + ret = kernctl_enable(chan->fd); if (ret < 0 && errno != EEXIST) { PERROR("Enable kernel chan"); @@ -290,11 +292,13 @@ int kernel_enable_event(struct ltt_kernel_event *event) { int ret; + assert(event); + ret = kernctl_enable(event->fd); if (ret < 0) { switch (errno) { case EEXIST: - ret = LTTCOMM_KERN_EVENT_EXIST; + ret = LTTNG_ERR_KERN_EVENT_EXIST; break; default: PERROR("enable kernel event"); @@ -319,11 +323,13 @@ int kernel_disable_event(struct ltt_kernel_event *event) { int ret; + assert(event); + ret = kernctl_disable(event->fd); if (ret < 0) { switch (errno) { case EEXIST: - ret = LTTCOMM_KERN_EVENT_EXIST; + ret = LTTNG_ERR_KERN_EVENT_EXIST; break; default: PERROR("disable kernel event"); @@ -345,13 +351,15 @@ error: * Create kernel metadata, open from the kernel tracer and add it to the * kernel session. */ -int kernel_open_metadata(struct ltt_kernel_session *session, char *path) +int kernel_open_metadata(struct ltt_kernel_session *session) { int ret; struct ltt_kernel_metadata *lkm; + assert(session); + /* Allocate kernel metadata */ - lkm = trace_kernel_create_metadata(path); + lkm = trace_kernel_create_metadata(); if (lkm == NULL) { goto error; } @@ -371,7 +379,7 @@ int kernel_open_metadata(struct ltt_kernel_session *session, char *path) session->metadata = lkm; - DBG("Kernel metadata opened (fd: %d and path: %s)", lkm->fd, lkm->pathname); + DBG("Kernel metadata opened (fd: %d)", lkm->fd); return 0; @@ -386,6 +394,8 @@ int kernel_start_session(struct ltt_kernel_session *session) { int ret; + assert(session); + ret = kernctl_start_session(session->fd); if (ret < 0) { PERROR("ioctl start session"); @@ -423,6 +433,8 @@ int kernel_calibrate(int fd, struct lttng_kernel_calibrate *calibrate) { int ret; + assert(calibrate); + ret = kernctl_calibrate(fd, calibrate); if (ret < 0) { PERROR("calibrate ioctl"); @@ -442,7 +454,7 @@ int kernel_metadata_flush_buffer(int fd) ret = kernctl_buffer_flush(fd); if (ret < 0) { - ERR("Fail to flush metadata buffers %d (ret: %d", fd, ret); + ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret); } return 0; @@ -456,6 +468,8 @@ int kernel_flush_buffer(struct ltt_kernel_channel *channel) int ret; struct ltt_kernel_stream *stream; + assert(channel); + DBG("Flush buffer for channel %s", channel->channel->name); cds_list_for_each_entry(stream, &channel->stream_list.head, list) { @@ -478,6 +492,8 @@ int kernel_stop_session(struct ltt_kernel_session *session) { int ret; + assert(session); + ret = kernctl_stop_session(session->fd); if (ret < 0) { goto error; @@ -499,11 +515,13 @@ error: */ int kernel_open_channel_stream(struct ltt_kernel_channel *channel) { - int ret; + int ret, count = 0; struct ltt_kernel_stream *lks; + assert(channel); + while ((ret = kernctl_create_stream(channel->fd)) >= 0) { - lks = trace_kernel_create_stream(); + lks = trace_kernel_create_stream(channel->channel->name, count); if (lks == NULL) { ret = close(ret); if (ret) { @@ -519,19 +537,15 @@ int kernel_open_channel_stream(struct ltt_kernel_channel *channel) PERROR("fcntl session fd"); } - ret = asprintf(&lks->pathname, "%s/%s_%d", - channel->pathname, channel->channel->name, channel->stream_count); - if (ret < 0) { - PERROR("asprintf kernel create stream"); - goto error; - } - /* Add stream to channe stream list */ cds_list_add(&lks->list, &channel->stream_list.head); channel->stream_count++; - DBG("Kernel stream %d created (fd: %d, state: %d, path: %s)", - channel->stream_count, lks->fd, lks->state, lks->pathname); + /* Increment counter which represent CPU number. */ + count++; + + DBG("Kernel stream %s created (fd: %d, state: %d)", lks->name, lks->fd, + lks->state); } return channel->stream_count; @@ -547,6 +561,8 @@ int kernel_open_metadata_stream(struct ltt_kernel_session *session) { int ret; + assert(session); + ret = kernctl_create_stream(session->metadata->fd); if (ret < 0) { PERROR("kernel create metadata stream"); @@ -575,10 +591,11 @@ ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events) int fd, pos, ret; char *event; size_t nbmem, count = 0; - ssize_t size; FILE *fp; struct lttng_event *elist; + assert(events); + fd = kernctl_tracepoint_list(tracer_fd); if (fd < 0) { PERROR("kernel tracepoint list"); @@ -597,24 +614,35 @@ ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events) */ nbmem = KERNEL_EVENT_INIT_LIST_SIZE; elist = zmalloc(sizeof(struct lttng_event) * nbmem); + if (elist == NULL) { + PERROR("alloc list events"); + count = -ENOMEM; + goto end; + } - while ((size = fscanf(fp, "event { name = %m[^;]; };%n\n", &event, &pos)) == 1) { + while (fscanf(fp, "event { name = %m[^;]; };%n\n", &event, &pos) == 1) { if (count >= nbmem) { + struct lttng_event *new_elist; + DBG("Reallocating event list from %zu to %zu bytes", nbmem, nbmem * 2); /* Double the size */ nbmem <<= 1; - elist = realloc(elist, nbmem * sizeof(struct lttng_event)); - if (elist == NULL) { + new_elist = realloc(elist, nbmem * sizeof(struct lttng_event)); + if (new_elist == NULL) { PERROR("realloc list events"); + free(event); + free(elist); count = -ENOMEM; goto end; } + elist = new_elist; } strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; elist[count].enabled = -1; count++; + free(event); } *events = elist; @@ -699,3 +727,51 @@ int init_kernel_workarounds(void) end_boot_id: return 0; } + +/* + * Complete teardown of a kernel session. + */ +void kernel_destroy_session(struct ltt_kernel_session *ksess) +{ + if (ksess == NULL) { + DBG3("No kernel session when tearing down session"); + return; + } + + DBG("Tearing down kernel session"); + + /* Close any relayd session */ + consumer_output_send_destroy_relayd(ksess->consumer); + + trace_kernel_destroy_session(ksess); +} + +/* + * Destroy a kernel channel object. It does not do anything on the tracer side. + */ +void kernel_destroy_channel(struct ltt_kernel_channel *kchan) +{ + struct ltt_kernel_session *ksess = NULL; + + assert(kchan); + assert(kchan->channel); + + DBG3("Kernel destroy channel %s", kchan->channel->name); + + /* Update channel count of associated session. */ + if (kchan->session) { + /* Keep pointer reference so we can update it after the destroy. */ + ksess = kchan->session; + } + + trace_kernel_destroy_channel(kchan); + + /* + * At this point the kernel channel is not visible anymore. This is safe + * since in order to work on a visible kernel session, the tracing session + * lock (ltt_session.lock) MUST be acquired. + */ + if (ksess) { + ksess->channel_count--; + } +}