#include <string.h>
#include <errno.h>
#include <urcu/list.h>
-#include <lttng/core.h>
+#include <urcu/hlist.h>
#include <lttng/ust-events.h>
+#include <assert.h>
+#include <helper.h>
#include "ltt-tracer-core.h"
+#include "jhash.h"
+#include "error.h"
/*
* probe list is protected by ust_lock()/ust_unlock().
*/
static CDS_LIST_HEAD(probe_list);
+/*
+ * Loglevel hash table, containing the active loglevels.
+ * Protected by ust lock.
+ */
+#define LOGLEVEL_HASH_BITS 6
+#define LOGLEVEL_TABLE_SIZE (1 << LOGLEVEL_HASH_BITS)
+static struct cds_hlist_head loglevel_table[LOGLEVEL_TABLE_SIZE];
+
+static
+const struct lttng_probe_desc *find_provider(const char *provider)
+{
+ struct lttng_probe_desc *iter;
+
+ cds_list_for_each_entry(iter, &probe_list, head) {
+ if (!strcmp(iter->provider, provider))
+ return iter;
+ }
+ return NULL;
+}
+
static
const struct lttng_event_desc *find_event(const char *name)
{
cds_list_for_each_entry(probe_desc, &probe_list, head) {
for (i = 0; i < probe_desc->nr_events; i++) {
- if (!strcmp(probe_desc->event_desc[i].name, name))
- return &probe_desc->event_desc[i];
+ if (!strcmp(probe_desc->event_desc[i]->name, name))
+ return probe_desc->event_desc[i];
}
}
return NULL;
int ltt_probe_register(struct lttng_probe_desc *desc)
{
+ struct lttng_probe_desc *iter;
int ret = 0;
int i;
ust_lock();
+ if (find_provider(desc->provider)) {
+ ret = -EEXIST;
+ goto end;
+ }
/*
* TODO: This is O(N^2). Turn into a hash table when probe registration
* overhead becomes an issue.
*/
for (i = 0; i < desc->nr_events; i++) {
- if (find_event(desc->event_desc[i].name)) {
+ if (find_event(desc->event_desc[i]->name)) {
ret = -EEXIST;
goto end;
}
}
+
+ /*
+ * We sort the providers by struct lttng_probe_desc pointer
+ * address.
+ */
+ cds_list_for_each_entry_reverse(iter, &probe_list, head) {
+ BUG_ON(iter == desc); /* Should never be in the list twice */
+ if (iter < desc) {
+ /* We belong to the location right after iter. */
+ cds_list_add(&desc->head, &iter->head);
+ goto desc_added;
+ }
+ }
+ /* We should be added at the head of the list */
cds_list_add(&desc->head, &probe_list);
+desc_added:
/*
* fix the events awaiting probe load.
*/
for (i = 0; i < desc->nr_events; i++) {
- ret = pending_probe_fix_events(&desc->event_desc[i]);
+ ret = pending_probe_fix_events(desc->event_desc[i]);
assert(!ret);
}
end:
{
}
-#if 0
-static
-void *tp_list_start(struct seq_file *m, loff_t *pos)
+void ltt_probes_prune_event_list(struct lttng_ust_tracepoint_list *list)
+{
+ struct tp_list_entry *list_entry, *tmp;
+
+ cds_list_for_each_entry_safe(list_entry, tmp, &list->head, head) {
+ cds_list_del(&list_entry->head);
+ free(list_entry);
+ }
+}
+
+/*
+ * called with UST lock held.
+ */
+int ltt_probes_get_event_list(struct lttng_ust_tracepoint_list *list)
{
struct lttng_probe_desc *probe_desc;
- int iter = 0, i;
+ int i;
- pthread_mutex_lock(&probe_mutex);
+ CDS_INIT_LIST_HEAD(&list->head);
cds_list_for_each_entry(probe_desc, &probe_list, head) {
for (i = 0; i < probe_desc->nr_events; i++) {
- if (iter++ >= *pos)
- return (void *) &probe_desc->event_desc[i];
+ struct tp_list_entry *list_entry;
+
+ list_entry = zmalloc(sizeof(*list_entry));
+ if (!list_entry)
+ goto err_nomem;
+ cds_list_add(&list_entry->head, &list->head);
+ strncpy(list_entry->tp.name,
+ probe_desc->event_desc[i]->name,
+ LTTNG_UST_SYM_NAME_LEN);
+ list_entry->tp.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
+ if (!probe_desc->event_desc[i]->loglevel) {
+ list_entry->tp.loglevel[0] = '\0';
+ list_entry->tp.loglevel_value = 0;
+ } else {
+ strncpy(list_entry->tp.loglevel,
+ (*probe_desc->event_desc[i]->loglevel)->identifier,
+ LTTNG_UST_SYM_NAME_LEN);
+ list_entry->tp.loglevel[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
+ list_entry->tp.loglevel_value =
+ (*probe_desc->event_desc[i]->loglevel)->value;
+ }
}
}
- /* End of list */
+ if (cds_list_empty(&list->head))
+ list->iter = NULL;
+ else
+ list->iter =
+ cds_list_first_entry(&list->head, struct tp_list_entry, head);
+ return 0;
+
+err_nomem:
+ ltt_probes_prune_event_list(list);
+ return -ENOMEM;
+}
+
+/*
+ * Return current iteration position, advance internal iterator to next.
+ * Return NULL if end of list.
+ */
+struct lttng_ust_tracepoint_iter *
+ lttng_ust_tracepoint_list_get_iter_next(struct lttng_ust_tracepoint_list *list)
+{
+ struct tp_list_entry *entry;
+
+ if (!list->iter)
+ return NULL;
+ entry = list->iter;
+ if (entry->head.next == &list->head)
+ list->iter = NULL;
+ else
+ list->iter = cds_list_entry(entry->head.next,
+ struct tp_list_entry, head);
+ return &entry->tp;
+}
+
+/*
+ * Get loglevel if the loglevel is present in the loglevel hash table.
+ * Must be called with ust lock held.
+ * Returns NULL if not present.
+ */
+struct loglevel_entry *get_loglevel(const char *name)
+{
+ struct cds_hlist_head *head;
+ struct cds_hlist_node *node;
+ struct loglevel_entry *e;
+ uint32_t hash = jhash(name, strlen(name), 0);
+
+ head = &loglevel_table[hash & (LOGLEVEL_TABLE_SIZE - 1)];
+ cds_hlist_for_each_entry(e, node, head, hlist) {
+ if (!strcmp(name, e->name))
+ return e;
+ }
return NULL;
}
+/*
+ * marshall all probes/all events and create those that fit the
+ * loglevel. Add them to the events list as created.
+ */
static
-void *tp_list_next(struct seq_file *m, void *p, loff_t *ppos)
+void _probes_create_loglevel_events(struct loglevel_entry *loglevel)
{
struct lttng_probe_desc *probe_desc;
- int iter = 0, i;
+ int i;
- (*ppos)++;
cds_list_for_each_entry(probe_desc, &probe_list, head) {
for (i = 0; i < probe_desc->nr_events; i++) {
- if (iter++ >= *ppos)
- return (void *) &probe_desc->event_desc[i];
+ const struct tracepoint_loglevel_entry *ev_ll;
+
+ if (!(probe_desc->event_desc[i]->loglevel))
+ continue;
+ ev_ll = *probe_desc->event_desc[i]->loglevel;
+ if (!strcmp(ev_ll->identifier, loglevel->name)) {
+ struct ltt_event *ev;
+ int ret;
+
+ /* create event */
+ ret = ltt_event_create(loglevel->chan,
+ &loglevel->event_param, NULL,
+ &ev);
+ /*
+ * TODO: report error.
+ */
+ if (ret)
+ continue;
+ cds_list_add(&ev->loglevel_list,
+ &loglevel->events);
+ }
+
}
}
- /* End of list */
- return NULL;
}
-static
-void tp_list_stop(struct seq_file *m, void *p)
+/*
+ * Add the loglevel to the loglevel hash table. Must be called with
+ * ust lock held.
+ */
+struct loglevel_entry *add_loglevel(const char *name,
+ struct ltt_channel *chan,
+ struct lttng_ust_event *event_param)
{
- pthread_mutex_unlock(&probe_mutex);
+ struct cds_hlist_head *head;
+ struct cds_hlist_node *node;
+ struct loglevel_entry *e;
+ size_t name_len = strlen(name) + 1;
+ uint32_t hash = jhash(name, name_len-1, 0);
+
+ head = &loglevel_table[hash & (LOGLEVEL_TABLE_SIZE - 1)];
+ cds_hlist_for_each_entry(e, node, head, hlist) {
+ if (!strcmp(name, e->name)) {
+ DBG("loglevel %s busy", name);
+ return ERR_PTR(-EEXIST); /* Already there */
+ }
+ }
+ /*
+ * Using zmalloc here to allocate a variable length element. Could
+ * cause some memory fragmentation if overused.
+ */
+ e = zmalloc(sizeof(struct loglevel_entry) + name_len);
+ if (!e)
+ return ERR_PTR(-ENOMEM);
+ memcpy(&e->name[0], name, name_len);
+ e->chan = chan;
+ e->enabled = 1;
+ memcpy(&e->event_param, event_param, sizeof(e->event_param));
+ cds_hlist_add_head(&e->hlist, head);
+ CDS_INIT_LIST_HEAD(&e->events);
+ _probes_create_loglevel_events(e);
+ cds_list_add(&e->list, &chan->session->loglevels);
+ return e;
}
-static
-int tp_list_show(struct seq_file *m, void *p)
+/*
+ * Remove the loglevel from the loglevel hash table. Must be called with
+ * ust_lock held. Only called at session teardown.
+ */
+void _remove_loglevel(struct loglevel_entry *loglevel)
{
- const struct lttng_event_desc *probe_desc = p;
+ struct ltt_event *ev, *tmp;
/*
- * Don't export lttng internal events (metadata).
+ * Just remove the events owned (for enable/disable) by this
+ * loglevel from the list. The session teardown will take care
+ * of freeing the event memory.
*/
- if (!strncmp(probe_desc->name, "lttng_", sizeof("lttng_") - 1))
- return 0;
- seq_printf(m, "event { name = %s; };\n",
- probe_desc->name);
- return 0;
+ cds_list_for_each_entry_safe(ev, tmp, &loglevel->events, list) {
+ cds_list_del(&ev->list);
+ }
+ cds_hlist_del(&loglevel->hlist);
+ cds_list_del(&loglevel->list);
+ free(loglevel);
}
-static
-const struct seq_operations lttng_tracepoint_list_seq_ops = {
- .start = tp_list_start,
- .next = tp_list_next,
- .stop = tp_list_stop,
- .show = tp_list_show,
-};
-
-static
-int lttng_tracepoint_list_open(struct inode *inode, struct file *file)
+int ltt_loglevel_enable(struct loglevel_entry *loglevel)
{
- return seq_open(file, <tng_tracepoint_list_seq_ops);
+ struct ltt_event *ev;
+ int ret;
+
+ if (loglevel->enabled)
+ return -EEXIST;
+ cds_list_for_each_entry(ev, &loglevel->events, list) {
+ ret = ltt_event_enable(ev);
+ if (ret) {
+ DBG("Error: enable error.\n");
+ return ret;
+ }
+ }
+ loglevel->enabled = 1;
+ return 0;
}
-const struct file_operations lttng_tracepoint_list_fops = {
- .open = lttng_tracepoint_list_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release,
-};
-#endif //0
+int ltt_loglevel_disable(struct loglevel_entry *loglevel)
+{
+ struct ltt_event *ev;
+ int ret;
+
+ if (!loglevel->enabled)
+ return -EEXIST;
+ cds_list_for_each_entry(ev, &loglevel->events, list) {
+ ret = ltt_event_disable(ev);
+ if (ret) {
+ DBG("Error: disable error.\n");
+ return ret;
+ }
+ }
+ loglevel->enabled = 0;
+ return 0;
+}
projects / lttng-ust.git / blobdiff