X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Fhealth%2Fhealth.c;fp=src%2Fcommon%2Fhealth%2Fhealth.c;h=0000000000000000000000000000000000000000;hp=8f147c678a95753d26f22584a5831af2c60ba2cb;hb=8784a4d054e8bfe27af0581fc9441c64a52b1074;hpb=6dca8ba7dec3b31acb7b43f5e4431676acf4e664 diff --git a/src/common/health/health.c b/src/common/health/health.c deleted file mode 100644 index 8f147c678..000000000 --- a/src/common/health/health.c +++ /dev/null @@ -1,294 +0,0 @@ -/* - * Copyright (C) 2012 David Goulet - * Copyright (C) 2013 Mathieu Desnoyers - * - * SPDX-License-Identifier: GPL-2.0-only - * - */ - -#define _LGPL_SOURCE -#include -#include -#include -#include - -#include -#include -#include -#include - -#include - -/* - * An application-specific error state for unregistered thread keeps - * track of thread errors. A thread reporting a health error, normally - * unregisters and quits. This makes the TLS health state not available - * to the health_check_state() call so on unregister we update this - * global error array so we can keep track of which thread was on error - * if the TLS health state has been removed. - */ -struct health_app { - /* List of health state, for each application thread */ - struct cds_list_head list; - /* - * This lock ensures that TLS memory used for the node and its - * container structure don't get reclaimed after the TLS owner - * thread exits until we have finished using it. - */ - pthread_mutex_t lock; - int nr_types; - struct timespec time_delta; - /* Health flags containing thread type error state */ - enum health_flags *flags; -}; - -/* Define TLS health state. */ -DEFINE_URCU_TLS(struct health_state, health_state); - -/* - * Initialize health check subsytem. - */ -static -void health_init(struct health_app *ha) -{ - /* - * Get the maximum value between the default delta value and the TCP - * timeout with a safety net of the default health check delta. - */ - ha->time_delta.tv_sec = max_t(unsigned long, - lttcomm_inet_tcp_timeout + DEFAULT_HEALTH_CHECK_DELTA_S, - ha->time_delta.tv_sec); - DBG("Health check time delta in seconds set to %lu", - ha->time_delta.tv_sec); -} - -struct health_app *health_app_create(int nr_types) -{ - struct health_app *ha; - - ha = zmalloc(sizeof(*ha)); - if (!ha) { - return NULL; - } - ha->flags = zmalloc(sizeof(*ha->flags) * nr_types); - if (!ha->flags) { - goto error_flags; - } - CDS_INIT_LIST_HEAD(&ha->list); - pthread_mutex_init(&ha->lock, NULL); - ha->nr_types = nr_types; - ha->time_delta.tv_sec = DEFAULT_HEALTH_CHECK_DELTA_S; - ha->time_delta.tv_nsec = DEFAULT_HEALTH_CHECK_DELTA_NS; - health_init(ha); - return ha; - -error_flags: - free(ha); - return NULL; -} - -void health_app_destroy(struct health_app *ha) -{ - free(ha->flags); - free(ha); -} - -/* - * Lock health state global list mutex. - */ -static void state_lock(struct health_app *ha) -{ - pthread_mutex_lock(&ha->lock); -} - -/* - * Unlock health state global list mutex. - */ -static void state_unlock(struct health_app *ha) -{ - pthread_mutex_unlock(&ha->lock); -} - -/* - * Set time difference in res from time_a and time_b. - */ -static void time_diff(const struct timespec *time_a, - const struct timespec *time_b, struct timespec *res) -{ - if (time_a->tv_nsec - time_b->tv_nsec < 0) { - res->tv_sec = time_a->tv_sec - time_b->tv_sec - 1; - res->tv_nsec = 1000000000L + time_a->tv_sec - time_b->tv_sec; - } else { - res->tv_sec = time_a->tv_sec - time_b->tv_sec; - res->tv_nsec = time_a->tv_nsec - time_b->tv_nsec; - } -} - -/* - * Return true if time_a - time_b > diff, else false. - */ -static int time_diff_gt(const struct timespec *time_a, - const struct timespec *time_b, const struct timespec *diff) -{ - struct timespec res; - - time_diff(time_a, time_b, &res); - time_diff(&res, diff, &res); - - if (res.tv_sec > 0) { - return 1; - } else if (res.tv_sec == 0 && res.tv_nsec > 0) { - return 1; - } - - return 0; -} - -/* - * Validate health state. Checks for the error flag or health conditions. - * - * Return 0 if health is bad or else 1. - */ -static int validate_state(struct health_app *ha, struct health_state *state) -{ - int retval = 1, ret; - unsigned long current, last; - struct timespec current_time; - - LTTNG_ASSERT(state); - - last = state->last; - current = uatomic_read(&state->current); - - ret = lttng_clock_gettime(CLOCK_MONOTONIC, ¤t_time); - if (ret < 0) { - PERROR("Error reading time\n"); - /* error */ - retval = 0; - goto end; - } - - /* - * Thread is in bad health if flag HEALTH_ERROR is set. It is also in bad - * health if, after the delta delay has passed, its the progress counter - * has not moved and it has NOT been waiting for a poll() call. - */ - if (uatomic_read(&state->flags) & HEALTH_ERROR) { - retval = 0; - goto end; - } - - /* - * Initial condition need to update the last counter and sample time, but - * should not check health in this initial case, because we don't know how - * much time has passed. - */ - if (state->last_time.tv_sec == 0 && state->last_time.tv_nsec == 0) { - /* update last counter and last sample time */ - state->last = current; - memcpy(&state->last_time, ¤t_time, sizeof(current_time)); - } else { - if (time_diff_gt(¤t_time, &state->last_time, - &ha->time_delta)) { - if (current == last && !HEALTH_IS_IN_POLL(current)) { - /* error */ - retval = 0; - } - /* update last counter and last sample time */ - state->last = current; - memcpy(&state->last_time, ¤t_time, sizeof(current_time)); - - /* On error, stop right now and notify caller. */ - if (retval == 0) { - goto end; - } - } - } - -end: - DBG("Health state current %lu, last %lu, ret %d", - current, last, ret); - return retval; -} - -/* - * Check health of a specific health type. Note that if a thread has not yet - * initialize its health subsystem or has quit, it's considered in a good - * state. - * - * Return 0 if health is bad or else 1. - */ -int health_check_state(struct health_app *ha, int type) -{ - int retval = 1; - struct health_state *state; - - LTTNG_ASSERT(type < ha->nr_types); - - state_lock(ha); - - cds_list_for_each_entry(state, &ha->list, node) { - int ret; - - if (state->type != type) { - continue; - } - - ret = validate_state(ha, state); - if (!ret) { - retval = 0; - goto end; - } - } - - /* Check the global state since some state might not be visible anymore. */ - if (ha->flags[type] & HEALTH_ERROR) { - retval = 0; - } - -end: - state_unlock(ha); - - DBG("Health check for type %d is %s", (int) type, - (retval == 0) ? "BAD" : "GOOD"); - return retval; -} - -/* - * Init health state. - */ -void health_register(struct health_app *ha, int type) -{ - LTTNG_ASSERT(type < ha->nr_types); - - /* Init TLS state. */ - uatomic_set(&URCU_TLS(health_state).last, 0); - uatomic_set(&URCU_TLS(health_state).last_time.tv_sec, 0); - uatomic_set(&URCU_TLS(health_state).last_time.tv_nsec, 0); - uatomic_set(&URCU_TLS(health_state).current, 0); - uatomic_set(&URCU_TLS(health_state).flags, 0); - uatomic_set(&URCU_TLS(health_state).type, type); - - /* Add it to the global TLS state list. */ - state_lock(ha); - cds_list_add(&URCU_TLS(health_state).node, &ha->list); - state_unlock(ha); -} - -/* - * Remove node from global list. - */ -void health_unregister(struct health_app *ha) -{ - state_lock(ha); - /* - * On error, set the global_error_state since we are about to remove - * the node from the global list. - */ - if (uatomic_read(&URCU_TLS(health_state).flags) & HEALTH_ERROR) { - uatomic_set(&ha->flags[URCU_TLS(health_state).type], - HEALTH_ERROR); - } - cds_list_del(&URCU_TLS(health_state).node); - state_unlock(ha); -}