From: Jérémie Galarneau Date: Fri, 26 Jul 2024 19:30:31 +0000 (+0000) Subject: sessiond: agent.cpp: iterate on lfht using lfht_iteration_adapter X-Git-Url: http://git.lttng.org./?a=commitdiff_plain;h=911ae7d0bff259b2d3644b0c5819b1c9d6eb86ac;p=lttng-tools.git sessiond: agent.cpp: iterate on lfht using lfht_iteration_adapter Change-Id: I4c590968f244bbffc4f685a611bfc8ec28c46688 Signed-off-by: Jérémie Galarneau --- diff --git a/src/bin/lttng-sessiond/agent.cpp b/src/bin/lttng-sessiond/agent.cpp index 2505a410c..ee93713e1 100644 --- a/src/bin/lttng-sessiond/agent.cpp +++ b/src/bin/lttng-sessiond/agent.cpp @@ -672,25 +672,20 @@ int agent_send_registration_done(struct agent_app *app) int agent_enable_event(struct agent_event *event, enum lttng_domain_type domain) { int ret; - struct agent_app *app; - struct lttng_ht_iter iter; LTTNG_ASSERT(event); - { - const lttng::urcu::read_lock_guard read_lock; - - cds_lfht_for_each_entry ( - the_agent_apps_ht_by_sock->ht, &iter.iter, app, node.node) { - if (app->domain != domain) { - continue; - } + for (auto *app : lttng::urcu:: + lfht_iteration_adapter( + *the_agent_apps_ht_by_sock->ht)) { + if (app->domain != domain) { + continue; + } - /* Enable event on agent application through TCP socket. */ - ret = enable_event(app, event); - if (ret != LTTNG_OK) { - goto error; - } + /* Enable event on agent application through TCP socket. */ + ret = enable_event(app, event); + if (ret != LTTNG_OK) { + goto error; } } @@ -741,8 +736,6 @@ end: int agent_enable_context(const struct lttng_event_context *ctx, enum lttng_domain_type domain) { int ret; - struct agent_app *app; - struct lttng_ht_iter iter; LTTNG_ASSERT(ctx); if (ctx->ctx != LTTNG_EVENT_CONTEXT_APP_CONTEXT) { @@ -750,29 +743,26 @@ int agent_enable_context(const struct lttng_event_context *ctx, enum lttng_domai goto error; } - { - const lttng::urcu::read_lock_guard read_lock; - - cds_lfht_for_each_entry ( - the_agent_apps_ht_by_sock->ht, &iter.iter, app, node.node) { - struct agent_app_ctx *agent_ctx; + for (auto *app : lttng::urcu:: + lfht_iteration_adapter( + *the_agent_apps_ht_by_sock->ht)) { + struct agent_app_ctx *agent_ctx; - if (app->domain != domain) { - continue; - } + if (app->domain != domain) { + continue; + } - agent_ctx = create_app_ctx(ctx); - if (!agent_ctx) { - ret = LTTNG_ERR_NOMEM; - goto error_unlock; - } + agent_ctx = create_app_ctx(ctx); + if (!agent_ctx) { + ret = LTTNG_ERR_NOMEM; + goto error_unlock; + } - /* Enable event on agent application through TCP socket. */ - ret = app_context_op(app, agent_ctx, AGENT_CMD_APP_CTX_ENABLE); - destroy_app_ctx(agent_ctx); - if (ret != LTTNG_OK) { - goto error_unlock; - } + /* Enable event on agent application through TCP socket. */ + ret = app_context_op(app, agent_ctx, AGENT_CMD_APP_CTX_ENABLE); + destroy_app_ctx(agent_ctx); + if (ret != LTTNG_OK) { + goto error_unlock; } } @@ -792,8 +782,6 @@ error: int agent_disable_event(struct agent_event *event, enum lttng_domain_type domain) { int ret = LTTNG_OK; - struct agent_app *app; - struct lttng_ht_iter iter; LTTNG_ASSERT(event); if (!AGENT_EVENT_IS_ENABLED(event)) { @@ -810,20 +798,17 @@ int agent_disable_event(struct agent_event *event, enum lttng_domain_type domain goto end; } - { - const lttng::urcu::read_lock_guard read_lock; - - cds_lfht_for_each_entry ( - the_agent_apps_ht_by_sock->ht, &iter.iter, app, node.node) { - if (app->domain != domain) { - continue; - } + for (auto *app : lttng::urcu:: + lfht_iteration_adapter( + *the_agent_apps_ht_by_sock->ht)) { + if (app->domain != domain) { + continue; + } - /* Enable event on agent application through TCP socket. */ - ret = disable_event(app, event); - if (ret != LTTNG_OK) { - goto error; - } + /* Enable event on agent application through TCP socket. */ + ret = disable_event(app, event); + if (ret != LTTNG_OK) { + goto error; } } @@ -844,25 +829,20 @@ end: static int disable_context(struct agent_app_ctx *ctx, enum lttng_domain_type domain) { int ret = LTTNG_OK; - struct agent_app *app; - struct lttng_ht_iter iter; LTTNG_ASSERT(ctx); DBG2("Disabling agent application context %s:%s", ctx->provider_name, ctx->ctx_name); - { - const lttng::urcu::read_lock_guard read_lock; - - cds_lfht_for_each_entry ( - the_agent_apps_ht_by_sock->ht, &iter.iter, app, node.node) { - if (app->domain != domain) { - continue; - } + for (auto *app : lttng::urcu:: + lfht_iteration_adapter( + *the_agent_apps_ht_by_sock->ht)) { + if (app->domain != domain) { + continue; + } - ret = app_context_op(app, ctx, AGENT_CMD_APP_CTX_DISABLE); - if (ret != LTTNG_OK) { - goto end; - } + ret = app_context_op(app, ctx, AGENT_CMD_APP_CTX_DISABLE); + if (ret != LTTNG_OK) { + goto end; } } end: @@ -879,9 +859,7 @@ int agent_list_events(struct lttng_event **events, enum lttng_domain_type domain { int ret; size_t nbmem, count = 0; - struct agent_app *app; struct lttng_event *tmp_events = nullptr; - struct lttng_ht_iter iter; LTTNG_ASSERT(events); @@ -895,54 +873,51 @@ int agent_list_events(struct lttng_event **events, enum lttng_domain_type domain goto error; } - { - const lttng::urcu::read_lock_guard read_lock; + for (auto *app : lttng::urcu:: + lfht_iteration_adapter( + *the_agent_apps_ht_by_sock->ht)) { + ssize_t nb_ev; + struct lttng_event *agent_events; - cds_lfht_for_each_entry ( - the_agent_apps_ht_by_sock->ht, &iter.iter, app, node.node) { - ssize_t nb_ev; - struct lttng_event *agent_events; + /* Skip domain not asked by the list. */ + if (app->domain != domain) { + continue; + } - /* Skip domain not asked by the list. */ - if (app->domain != domain) { - continue; - } + nb_ev = list_events(app, &agent_events); + if (nb_ev < 0) { + ret = nb_ev; + goto error; + } - nb_ev = list_events(app, &agent_events); - if (nb_ev < 0) { - ret = nb_ev; + if (count + nb_ev > nbmem) { + /* In case the realloc fails, we free the memory */ + struct lttng_event *new_tmp_events; + size_t new_nbmem; + + new_nbmem = std::max(count + nb_ev, nbmem << 1); + DBG2("Reallocating agent event list from %zu to %zu entries", + nbmem, + new_nbmem); + new_tmp_events = (lttng_event *) realloc( + tmp_events, new_nbmem * sizeof(*new_tmp_events)); + if (!new_tmp_events) { + PERROR("realloc agent events"); + ret = -ENOMEM; + free(agent_events); goto error; } - if (count + nb_ev > nbmem) { - /* In case the realloc fails, we free the memory */ - struct lttng_event *new_tmp_events; - size_t new_nbmem; - - new_nbmem = std::max(count + nb_ev, nbmem << 1); - DBG2("Reallocating agent event list from %zu to %zu entries", - nbmem, - new_nbmem); - new_tmp_events = (lttng_event *) realloc( - tmp_events, new_nbmem * sizeof(*new_tmp_events)); - if (!new_tmp_events) { - PERROR("realloc agent events"); - ret = -ENOMEM; - free(agent_events); - goto error; - } - - /* Zero the new memory */ - memset(new_tmp_events + nbmem, - 0, - (new_nbmem - nbmem) * sizeof(*new_tmp_events)); - nbmem = new_nbmem; - tmp_events = new_tmp_events; - } - memcpy(tmp_events + count, agent_events, nb_ev * sizeof(*tmp_events)); - free(agent_events); - count += nb_ev; + /* Zero the new memory */ + memset(new_tmp_events + nbmem, + 0, + (new_nbmem - nbmem) * sizeof(*new_tmp_events)); + nbmem = new_nbmem; + tmp_events = new_tmp_events; } + memcpy(tmp_events + count, agent_events, nb_ev * sizeof(*tmp_events)); + free(agent_events); + count += nb_ev; } ret = count; @@ -1409,41 +1384,35 @@ static void destroy_app_ctx_rcu(struct rcu_head *head) */ void agent_destroy(struct agent *agt) { - struct lttng_ht_node_str *node; - struct lttng_ht_iter iter; - struct agent_app_ctx *ctx; - LTTNG_ASSERT(agt); DBG3("Agent destroy"); - { - const lttng::urcu::read_lock_guard read_lock; - - cds_lfht_for_each_entry (agt->events->ht, &iter.iter, node, node) { - int ret; - struct agent_event *event; - - /* - * When destroying an event, we have to try to disable it on the - * agent side so the event stops generating data. The return - * value is not important since we have to continue anyway - * destroying the object. - */ - event = lttng::utils::container_of(node, &agent_event::node); - (void) agent_disable_event(event, agt->domain); - - ret = lttng_ht_del(agt->events, &iter); - LTTNG_ASSERT(!ret); - call_rcu(&node->head, destroy_event_agent_rcu); - } + for (auto *event : + lttng::urcu::lfht_iteration_adapter(*agt->events->ht)) { + int ret; - cds_list_for_each_entry_rcu(ctx, &agt->app_ctx_list, list_node) - { - (void) disable_context(ctx, agt->domain); - cds_list_del(&ctx->list_node); - call_rcu(&ctx->rcu_node, destroy_app_ctx_rcu); - } + /* + * When destroying an event, we have to try to disable it on the + * agent side so the event stops generating data. The return + * value is not important since we have to continue anyway + * destroying the object. + */ + (void) agent_disable_event(event, agt->domain); + + ret = cds_lfht_del(agt->events->ht, &event->node.node); + LTTNG_ASSERT(!ret); + call_rcu(&event->node.head, destroy_event_agent_rcu); + } + + agent_app_ctx *ctx; + cds_list_for_each_entry_rcu(ctx, &agt->app_ctx_list, list_node) + { + (void) disable_context(ctx, agt->domain); + cds_list_del(&ctx->list_node); + call_rcu(&ctx->rcu_node, destroy_app_ctx_rcu); } lttng_ht_destroy(agt->events); @@ -1489,22 +1458,14 @@ void agent_destroy_app_by_sock(int sock) */ void agent_app_ht_clean() { - struct lttng_ht_node_ulong *node; - struct lttng_ht_iter iter; - if (!the_agent_apps_ht_by_sock) { return; } - { - const lttng::urcu::read_lock_guard read_lock; - - cds_lfht_for_each_entry (the_agent_apps_ht_by_sock->ht, &iter.iter, node, node) { - struct agent_app *app; - - app = lttng::utils::container_of(node, &agent_app::node); - agent_destroy_app_by_sock(app->sock->fd); - } + for (auto *app : lttng::urcu:: + lfht_iteration_adapter( + *the_agent_apps_ht_by_sock->ht)) { + agent_destroy_app_by_sock(app->sock->fd); } lttng_ht_destroy(the_agent_apps_ht_by_sock); @@ -1519,8 +1480,6 @@ void agent_app_ht_clean() void agent_update(const struct agent *agt, const struct agent_app *app) { int ret; - struct agent_event *event; - struct lttng_ht_iter iter; struct agent_app_ctx *ctx; LTTNG_ASSERT(agt); @@ -1532,37 +1491,36 @@ void agent_update(const struct agent *agt, const struct agent_app *app) * We are in the registration path thus if the application is gone, * there is a serious code flow error. */ - { - const lttng::urcu::read_lock_guard read_lock; - - cds_lfht_for_each_entry (agt->events->ht, &iter.iter, event, node.node) { - /* Skip event if disabled. */ - if (!AGENT_EVENT_IS_ENABLED(event)) { - continue; - } + for (auto *event : + lttng::urcu::lfht_iteration_adapter(*agt->events->ht)) { + /* Skip event if disabled. */ + if (!AGENT_EVENT_IS_ENABLED(event)) { + continue; + } - ret = enable_event(app, event); - if (ret != LTTNG_OK) { - DBG2("Agent update unable to enable event %s on app pid: %d sock %d", - event->name, - app->pid, - app->sock->fd); - /* Let's try the others here and don't assume the app is dead. */ - continue; - } + ret = enable_event(app, event); + if (ret != LTTNG_OK) { + DBG2("Agent update unable to enable event %s on app pid: %d sock %d", + event->name, + app->pid, + app->sock->fd); + /* Let's try the others here and don't assume the app is dead. */ + continue; } + } - cds_list_for_each_entry_rcu(ctx, &agt->app_ctx_list, list_node) - { - ret = app_context_op(app, ctx, AGENT_CMD_APP_CTX_ENABLE); - if (ret != LTTNG_OK) { - DBG2("Agent update unable to add application context %s:%s on app pid: %d sock %d", - ctx->provider_name, - ctx->ctx_name, - app->pid, - app->sock->fd); - continue; - } + cds_list_for_each_entry_rcu(ctx, &agt->app_ctx_list, list_node) + { + ret = app_context_op(app, ctx, AGENT_CMD_APP_CTX_ENABLE); + if (ret != LTTNG_OK) { + DBG2("Agent update unable to add application context %s:%s on app pid: %d sock %d", + ctx->provider_name, + ctx->ctx_name, + app->pid, + app->sock->fd); + continue; } } } @@ -1582,24 +1540,18 @@ int agent_by_event_notifier_domain_ht_create() */ void agent_by_event_notifier_domain_ht_destroy() { - struct lttng_ht_node_u64 *node; - struct lttng_ht_iter iter; - if (!the_trigger_agents_ht_by_domain) { return; } - { - const lttng::urcu::read_lock_guard read_lock; - - cds_lfht_for_each_entry ( - the_trigger_agents_ht_by_domain->ht, &iter.iter, node, node) { - struct agent *agent = lttng::utils::container_of(node, &agent::node); - const int ret = lttng_ht_del(the_trigger_agents_ht_by_domain, &iter); + for (auto *agent : + lttng::urcu::lfht_iteration_adapter( + *the_trigger_agents_ht_by_domain->ht)) { + const auto ret = + cds_lfht_del(the_trigger_agents_ht_by_domain->ht, &agent->node.node); - LTTNG_ASSERT(ret == 0); - agent_destroy(agent); - } + LTTNG_ASSERT(ret == 0); + agent_destroy(agent); } lttng_ht_destroy(the_trigger_agents_ht_by_domain);