#include "consumer.h"
#include "kernel.h"
+#include "kernel-consumer.h"
#include "kern-modules.h"
/*
{
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) {
int ret;
struct ltt_kernel_session *lks;
+ assert(session);
+
/* Allocate data structure */
- lks = trace_kernel_create_session(session->path);
+ lks = trace_kernel_create_session();
if (lks == NULL) {
ret = -1;
goto error;
return 0;
error:
+ if (lks) {
+ trace_kernel_destroy_session(lks);
+ }
return ret;
}
* kernel session.
*/
int kernel_create_channel(struct ltt_kernel_session *session,
- struct lttng_channel *chan, char *path)
+ struct lttng_channel *chan)
{
int ret;
struct ltt_kernel_channel *lkc;
+ assert(session);
+ assert(chan);
+
/* Allocate kernel channel */
- lkc = trace_kernel_create_channel(chan, path);
+ lkc = trace_kernel_create_channel(chan);
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,
+ DBG3("Kernel create channel %s with attr: %d, %" PRIu64 ", %" PRIu64 ", %u, %u, %d, %d",
+ chan->name, 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);
+ lkc->channel->attr.live_timer_interval, lkc->channel->attr.output);
/* Kernel tracer channel creation */
ret = kernctl_create_channel(session->fd, &lkc->channel->attr);
/* 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)", lkc->channel->name, lkc->fd);
return 0;
error:
+ if (lkc) {
+ free(lkc->channel);
+ free(lkc);
+ }
return -1;
}
int ret;
struct ltt_kernel_event *event;
+ assert(ev);
+ assert(channel);
+
event = trace_kernel_create_event(ev);
if (event == NULL) {
ret = -1;
{
int ret;
+ assert(chan);
+
ret = kernctl_disable(chan->fd);
if (ret < 0) {
PERROR("disable chan ioctl");
{
int ret;
+ assert(chan);
+
ret = kernctl_enable(chan->fd);
if (ret < 0 && errno != EEXIST) {
PERROR("Enable kernel chan");
{
int ret;
+ assert(event);
+
ret = kernctl_enable(event->fd);
if (ret < 0) {
switch (errno) {
{
int ret;
+ assert(event);
+
ret = kernctl_disable(event->fd);
if (ret < 0) {
switch (errno) {
int kernel_open_metadata(struct ltt_kernel_session *session)
{
int ret;
- struct ltt_kernel_metadata *lkm;
+ struct ltt_kernel_metadata *lkm = NULL;
+
+ assert(session);
/* Allocate kernel metadata */
lkm = trace_kernel_create_metadata();
/* Kernel tracer metadata creation */
ret = kernctl_open_metadata(session->fd, &lkm->conf->attr);
if (ret < 0) {
- goto error;
+ goto error_open;
}
lkm->fd = ret;
return 0;
+error_open:
+ trace_kernel_destroy_metadata(lkm);
error:
return -1;
}
{
int ret;
+ assert(session);
+
ret = kernctl_start_session(session->fd);
if (ret < 0) {
PERROR("ioctl start session");
{
int ret;
+ assert(calibrate);
+
ret = kernctl_calibrate(fd, calibrate);
if (ret < 0) {
PERROR("calibrate ioctl");
{
int ret;
+ DBG("Kernel flushing metadata buffer on fd %d", fd);
+
ret = kernctl_buffer_flush(fd);
if (ret < 0) {
ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret);
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) {
{
int ret;
+ assert(session);
+
ret = kernctl_stop_session(session->fd);
if (ret < 0) {
goto error;
int ret, count = 0;
struct ltt_kernel_stream *lks;
+ assert(channel);
+
while ((ret = kernctl_create_stream(channel->fd)) >= 0) {
lks = trace_kernel_create_stream(channel->channel->name, count);
if (lks == NULL) {
PERROR("fcntl session fd");
}
+ lks->tracefile_size = channel->channel->attr.tracefile_size;
+ lks->tracefile_count = channel->channel->attr.tracefile_count;
+
/* Add stream to channe stream list */
cds_list_add(&lks->list, &channel->stream_list.head);
channel->stream_count++;
{
int ret;
+ assert(session);
+
ret = kernctl_create_stream(session->metadata->fd);
if (ret < 0) {
PERROR("kernel create metadata stream");
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");
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("Tearing down kernel session");
+ /*
+ * Destroy channels on the consumer if in no output mode because the
+ * streams are in *no* monitor mode so we have to send a command to clean
+ * them up or else they leaked.
+ */
+ if (!ksess->output_traces) {
+ int ret;
+ struct consumer_socket *socket;
+ struct lttng_ht_iter iter;
+
+ /* For each consumer socket. */
+ cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
+ socket, node.node) {
+ struct ltt_kernel_channel *chan;
+
+ /* For each channel, ask the consumer to destroy it. */
+ cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
+ ret = kernel_consumer_destroy_channel(socket, chan);
+ if (ret < 0) {
+ /* Consumer is probably dead. Use next socket. */
+ continue;
+ }
+ }
+ }
+ }
+
/* 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--;
+ }
+}
+
+/*
+ * Take a snapshot for a given kernel session.
+ *
+ * Return 0 on success or else return a LTTNG_ERR code.
+ */
+int kernel_snapshot_record(struct ltt_kernel_session *ksess,
+ struct snapshot_output *output, int wait, unsigned int nb_streams)
+{
+ int err, ret, saved_metadata_fd;
+ struct consumer_socket *socket;
+ struct lttng_ht_iter iter;
+ struct ltt_kernel_metadata *saved_metadata;
+ uint64_t max_size_per_stream = 0;
+
+ assert(ksess);
+ assert(ksess->consumer);
+ assert(output);
+
+ DBG("Kernel snapshot record started");
+
+ /* Save current metadata since the following calls will change it. */
+ saved_metadata = ksess->metadata;
+ saved_metadata_fd = ksess->metadata_stream_fd;
+
+ rcu_read_lock();
+
+ ret = kernel_open_metadata(ksess);
+ if (ret < 0) {
+ ret = LTTNG_ERR_KERN_META_FAIL;
+ goto error;
+ }
+
+ ret = kernel_open_metadata_stream(ksess);
+ if (ret < 0) {
+ ret = LTTNG_ERR_KERN_META_FAIL;
+ goto error_open_stream;
+ }
+
+ if (output->max_size > 0 && nb_streams > 0) {
+ max_size_per_stream = output->max_size / nb_streams;
+ }
+
+ /* Send metadata to consumer and snapshot everything. */
+ cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
+ socket, node.node) {
+ struct consumer_output *saved_output;
+ struct ltt_kernel_channel *chan;
+
+ /*
+ * Temporarly switch consumer output for our snapshot output. As long
+ * as the session lock is taken, this is safe.
+ */
+ saved_output = ksess->consumer;
+ ksess->consumer = output->consumer;
+
+ pthread_mutex_lock(socket->lock);
+ /* This stream must not be monitored by the consumer. */
+ ret = kernel_consumer_add_metadata(socket, ksess, 0);
+ pthread_mutex_unlock(socket->lock);
+ /* Put back the saved consumer output into the session. */
+ ksess->consumer = saved_output;
+ if (ret < 0) {
+ ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
+ goto error_consumer;
+ }
+
+ /* For each channel, ask the consumer to snapshot it. */
+ cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
+ if (max_size_per_stream &&
+ chan->channel->attr.subbuf_size > max_size_per_stream) {
+ ret = LTTNG_ERR_INVALID;
+ DBG3("Kernel snapshot record maximum stream size %" PRIu64
+ " is smaller than subbuffer size of %" PRIu64,
+ max_size_per_stream, chan->channel->attr.subbuf_size);
+ (void) kernel_consumer_destroy_metadata(socket,
+ ksess->metadata);
+ goto error_consumer;
+ }
+
+ pthread_mutex_lock(socket->lock);
+ ret = consumer_snapshot_channel(socket, chan->fd, output, 0,
+ ksess->uid, ksess->gid,
+ DEFAULT_KERNEL_TRACE_DIR, wait,
+ max_size_per_stream);
+ pthread_mutex_unlock(socket->lock);
+ if (ret < 0) {
+ ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
+ (void) kernel_consumer_destroy_metadata(socket,
+ ksess->metadata);
+ goto error_consumer;
+ }
+ }
+
+ /* Snapshot metadata, */
+ pthread_mutex_lock(socket->lock);
+ ret = consumer_snapshot_channel(socket, ksess->metadata->fd, output,
+ 1, ksess->uid, ksess->gid,
+ DEFAULT_KERNEL_TRACE_DIR, wait, max_size_per_stream);
+ pthread_mutex_unlock(socket->lock);
+ if (ret < 0) {
+ ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
+ goto error_consumer;
+ }
+
+ /*
+ * The metadata snapshot is done, ask the consumer to destroy it since
+ * it's not monitored on the consumer side.
+ */
+ (void) kernel_consumer_destroy_metadata(socket, ksess->metadata);
+ }
+
+error_consumer:
+ /* Close newly opened metadata stream. It's now on the consumer side. */
+ err = close(ksess->metadata_stream_fd);
+ if (err < 0) {
+ PERROR("close snapshot kernel");
+ }
+
+error_open_stream:
+ trace_kernel_destroy_metadata(ksess->metadata);
+error:
+ /* Restore metadata state.*/
+ ksess->metadata = saved_metadata;
+ ksess->metadata_stream_fd = saved_metadata_fd;
+
+ rcu_read_unlock();
+ return ret;
+}
projects / lttng-tools.git / blobdiff