mirror of https://gerrit.osmocom.org/libosmocore
Revert "Revert "logging: add log level cache""
This reverts commit 7f1fb3ea81
- slightly
amended with the new log_cache_enalbe() function. The cache is hence
disabled by default, and applications can enable it, if they wish to
benefit from it.
Reason for the original revert was: some fallout expected due to log
manipulation in test code
Change-Id: I539872fc9e3c50b407e6bc388f1e091fa2c826c3
This commit is contained in:
parent
35f20b1ff7
commit
43018ec161
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@ -409,7 +409,8 @@ int log_set_context(uint8_t ctx, void *value);
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/* filter on the targets */
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void log_set_all_filter(struct log_target *target, int);
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int log_cache_enable(void);
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void log_cache_update(int mapped_subsys, uint8_t enabled, uint8_t level);
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void log_set_use_color(struct log_target *target, int);
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void log_set_print_extended_timestamp(struct log_target *target, int);
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void log_set_print_timestamp(struct log_target *target, int);
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@ -58,6 +58,8 @@ gsmtap_type_names;
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log_add_target;
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log_category_name;
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log_check_level;
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log_cache_enable;
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log_cache_update;
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log_del_target;
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log_enable_multithread;
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log_fini;
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@ -93,6 +93,80 @@ LLIST_HEAD(osmo_log_target_list);
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static __thread long int logging_tid;
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#if (!EMBEDDED)
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/*! One global copy that contains the union of log levels for all targets
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* for all categories, used for quick lock free checks of log targets. */
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static volatile uint8_t *log_level_lookup_cache;
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/*! Updates cache for all targets for all categies, caller must hold osmo_log_tgt_mutex. */
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static void log_cache_update_all(void)
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{
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struct log_target *tgt;
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uint8_t tmp_en[osmo_log_info->num_cat];
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uint8_t tmp_level[osmo_log_info->num_cat];
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if (!log_level_lookup_cache)
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return;
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memset(tmp_en, 0, osmo_log_info->num_cat);
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memset(tmp_level, UINT8_MAX, osmo_log_info->num_cat);
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/* values can also decrease.. */
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llist_for_each_entry(tgt, &osmo_log_target_list, entry) {
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for (int i = 0; i < osmo_log_info->num_cat; i++) {
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struct log_category *cat = &tgt->categories[i];
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tmp_en[i] = OSMO_MAX(tmp_en[i], cat->enabled);
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tmp_level[i] = OSMO_MIN(tmp_level[i], cat->loglevel);
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tmp_level[i] = tgt->loglevel ? OSMO_MIN(tmp_level[i], tgt->loglevel) : tmp_level[i];
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}
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}
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for (int i = 0; i < osmo_log_info->num_cat; i++)
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log_level_lookup_cache[i] = tmp_en[i] ? tmp_level[i] : UINT8_MAX;
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}
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/*! Updates single cache entry, caller must hold osmo_log_tgt_mutex.
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*
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* \param[in] mapped_subsys plain category index (after mapping)
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* \param[in] enabled log category enabled?
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* \param[in] level log level
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*/
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void log_cache_update(int mapped_subsys, uint8_t enabled, uint8_t level)
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{
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struct log_target *tgt;
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struct log_category tmp = { UINT8_MAX, 0 };
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if (!log_level_lookup_cache)
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return;
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/* values can also decrease.. */
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llist_for_each_entry(tgt, &osmo_log_target_list, entry) {
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struct log_category *cat = &tgt->categories[mapped_subsys];
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tmp.enabled = OSMO_MAX(tmp.enabled, cat->enabled);
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tmp.loglevel = OSMO_MIN(tmp.loglevel, cat->loglevel);
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tmp.loglevel = tgt->loglevel ? OSMO_MIN(tmp.loglevel, tgt->loglevel) : tmp.loglevel;
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}
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tmp.enabled = OSMO_MAX(tmp.enabled, enabled);
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tmp.loglevel = OSMO_MIN(tmp.loglevel, level);
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log_level_lookup_cache[mapped_subsys] = tmp.enabled ? tmp.loglevel : UINT8_MAX;
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}
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/*! Queries log level cache.
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*
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* \param[in] mapped_subsys plain category index (after mapping)
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* \param[in] level log level
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* \returns true if logging should happen for at least one log target
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*/
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static bool log_cache_check(int mapped_subsys, int level)
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{
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if (!log_level_lookup_cache) {
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/* log-cache is not enabled, so we simply behave like we did before the cache */
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return true;
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}
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return (level < log_level_lookup_cache[mapped_subsys]) ? false : true;
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}
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/*! This mutex must be held while using osmo_log_target_list or any of its
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log_targets in a multithread program. Prevents race conditions between threads
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like producing unordered timestamps or VTY deleting a target while another
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@ -426,6 +500,10 @@ void log_parse_category_mask(struct log_target* target, const char *_mask)
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}
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} while ((category_token = strtok(NULL, ":")));
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#if !defined(EMBEDDED)
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log_cache_update_all();
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#endif
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free(mask);
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}
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@ -680,6 +758,11 @@ void osmo_vlogp(int subsys, int level, const char *file, int line,
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subsys = map_subsys(subsys);
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#if !defined(EMBEDDED)
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if (!log_cache_check(subsys, level))
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return;
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#endif
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log_tgt_mutex_lock();
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llist_for_each_entry(tar, &osmo_log_target_list, entry) {
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@ -754,6 +837,9 @@ void logp_stub(const char *file, int line, int cont, const char *format, ...)
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void log_add_target(struct log_target *target)
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{
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llist_add_tail(&target->entry, &osmo_log_target_list);
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#if (!EMBEDDED)
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log_cache_update_all();
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#endif
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}
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/*! Unregister a log target from the logging core
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@ -762,6 +848,9 @@ void log_add_target(struct log_target *target)
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void log_del_target(struct log_target *target)
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{
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llist_del(&target->entry);
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#if (!EMBEDDED)
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log_cache_update_all();
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#endif
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}
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/*! Reset (clear) the logging context */
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@ -922,6 +1011,9 @@ void log_set_print_level(struct log_target *target, int print_level)
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void log_set_log_level(struct log_target *target, int log_level)
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{
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target->loglevel = log_level;
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#if !defined(EMBEDDED)
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log_cache_update_all();
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#endif
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}
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/*! Set a category filter on a given log target
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@ -938,6 +1030,10 @@ void log_set_category_filter(struct log_target *target, int category,
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category = map_subsys(category);
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target->categories[category].enabled = !!enable;
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target->categories[category].loglevel = level;
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#if !defined(EMBEDDED)
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log_cache_update(category, !!enable, level);
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#endif
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}
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#if (!EMBEDDED)
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@ -1046,6 +1142,15 @@ struct log_target *log_target_create(void)
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/* global log level */
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target->loglevel = 0;
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#if !defined(EMBEDDED)
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/* update cache */
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for (i = 0; i < osmo_log_info->num_cat; i++) {
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const struct log_info_cat *c = &osmo_log_info->cat[i];
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log_cache_update(i, c->enabled, c->loglevel);
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}
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#endif
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return target;
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}
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@ -1393,6 +1498,31 @@ int log_targets_reopen(void)
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return rc;
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}
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/*! Enable the log level lookup cache to bypass string formatting and other code for log statements which are
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* not actually enabled/needed by any existing log target.
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* \retruns 0 in case of success, negative -errno in case of error. */
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int log_cache_enable(void)
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{
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#if !defined(EMBEDDED)
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if (log_level_lookup_cache)
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return -EEXIST;
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log_level_lookup_cache = talloc_zero_array(osmo_log_info, uint8_t, osmo_log_info->num_cat);
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if (!log_level_lookup_cache)
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return -ENOMEM;
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/* copy everything for level lookup cache */
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log_tgt_mutex_lock();
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log_cache_update_all();
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log_tgt_mutex_unlock();
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return 0;
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#else
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return -ENOTSUP;
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#endif
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}
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/*! Initialize the Osmocom logging core
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* \param[in] inf Information regarding logging categories, could be NULL
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* \param[in] ctx talloc context for logging allocations
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@ -1486,6 +1616,11 @@ int log_check_level(int subsys, unsigned int level)
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subsys = map_subsys(subsys);
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#if !defined(EMBEDDED)
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if (!log_cache_check(subsys, level))
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return 0;
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#endif
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/* TODO: The following could/should be cached (update on config) */
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log_tgt_mutex_lock();
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@ -382,6 +382,10 @@ DEFUN(logging_level,
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tgt->categories[category].enabled = 1;
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tgt->categories[category].loglevel = level;
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#if !defined(EMBEDDED)
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log_cache_update(category, 1, level);
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#endif
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RET_WITH_UNLOCK(CMD_SUCCESS);
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}
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cat->enabled = 1;
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cat->loglevel = level;
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#if !defined(EMBEDDED)
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log_cache_update(i, 1, level);
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#endif
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}
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RET_WITH_UNLOCK(CMD_SUCCESS);
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}
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