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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2023-07-20 04:49:55 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2023-07-20 04:49:55 +0000 |
commit | ab1bb5b7f1c3c3a7b240ab7fc8661459ecd7decb (patch) | |
tree | 7a900833aad3ccc685712c6c2a7d87576d54f427 /collectors/ebpf.plugin/ebpf_mdflush.c | |
parent | Adding upstream version 1.40.1. (diff) | |
download | netdata-878715cc218c4a71a71c4cb4b4634082aa9627ba.tar.xz netdata-878715cc218c4a71a71c4cb4b4634082aa9627ba.zip |
Adding upstream version 1.41.0.upstream/1.41.0
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'collectors/ebpf.plugin/ebpf_mdflush.c')
-rw-r--r-- | collectors/ebpf.plugin/ebpf_mdflush.c | 195 |
1 files changed, 188 insertions, 7 deletions
diff --git a/collectors/ebpf.plugin/ebpf_mdflush.c b/collectors/ebpf.plugin/ebpf_mdflush.c index 65ed860a4..3548d673b 100644 --- a/collectors/ebpf.plugin/ebpf_mdflush.c +++ b/collectors/ebpf.plugin/ebpf_mdflush.c @@ -31,6 +31,10 @@ static ebpf_local_maps_t mdflush_maps[] = { } }; +netdata_ebpf_targets_t mdflush_targets[] = { {.name = "md_flush_request", .mode = EBPF_LOAD_TRAMPOLINE}, + {.name = NULL, .mode = EBPF_LOAD_TRAMPOLINE}}; + + // store for "published" data from the reader thread, which the collector // thread will write to netdata agent. static avl_tree_lock mdflush_pub; @@ -38,6 +42,113 @@ static avl_tree_lock mdflush_pub; // tmp store for mdflush values we get from a per-CPU eBPF map. static mdflush_ebpf_val_t *mdflush_ebpf_vals = NULL; +#ifdef LIBBPF_MAJOR_VERSION +/** + * Disable probes + * + * Disable probes to use trampolines. + * + * @param obj the loaded object structure. + */ +static inline void ebpf_disable_probes(struct mdflush_bpf *obj) +{ + bpf_program__set_autoload(obj->progs.netdata_md_flush_request_kprobe, false); +} + +/** + * Disable trampolines + * + * Disable trampoliness to use probes. + * + * @param obj the loaded object structure. + */ +static inline void ebpf_disable_trampoline(struct mdflush_bpf *obj) +{ + bpf_program__set_autoload(obj->progs.netdata_md_flush_request_fentry, false); +} + +/** + * Set Trampoline + * + * Define target to attach trampoline + * + * @param obj the loaded object structure. + */ +static void ebpf_set_trampoline_target(struct mdflush_bpf *obj) +{ + bpf_program__set_attach_target(obj->progs.netdata_md_flush_request_fentry, 0, + mdflush_targets[NETDATA_MD_FLUSH_REQUEST].name); +} + +/** + * Load probe + * + * Load probe to monitor internal function. + * + * @param obj the loaded object structure. + */ +static inline int ebpf_load_probes(struct mdflush_bpf *obj) +{ + obj->links.netdata_md_flush_request_kprobe = bpf_program__attach_kprobe(obj->progs.netdata_md_flush_request_kprobe, + false, + mdflush_targets[NETDATA_MD_FLUSH_REQUEST].name); + return libbpf_get_error(obj->links.netdata_md_flush_request_kprobe); +} + +/** + * Load and Attach + * + * Load and attach bpf codes according user selection. + * + * @param obj the loaded object structure. + * @param em the structure with configuration + */ +static inline int ebpf_mdflush_load_and_attach(struct mdflush_bpf *obj, ebpf_module_t *em) +{ + int mode = em->targets[NETDATA_MD_FLUSH_REQUEST].mode; + if (mode == EBPF_LOAD_TRAMPOLINE) { // trampoline + ebpf_disable_probes(obj); + + ebpf_set_trampoline_target(obj); + } else // kprobe + ebpf_disable_trampoline(obj); + + int ret = mdflush_bpf__load(obj); + if (ret) { + fprintf(stderr, "failed to load BPF object: %d\n", ret); + return -1; + } + + if (mode == EBPF_LOAD_TRAMPOLINE) + ret = mdflush_bpf__attach(obj); + else + ret = ebpf_load_probes(obj); + + return ret; +} + +#endif + +/** + * Obsolete global + * + * Obsolete global charts created by thread. + * + * @param em a pointer to `struct ebpf_module` + */ +static void ebpf_obsolete_mdflush_global(ebpf_module_t *em) +{ + ebpf_write_chart_obsolete("mdstat", + "mdstat_flush", + "MD flushes", + "flushes", + "flush (eBPF)", + NETDATA_EBPF_CHART_TYPE_STACKED, + NULL, + NETDATA_CHART_PRIO_MDSTAT_FLUSH, + em->update_every); +} + /** * MDflush exit * @@ -49,11 +160,26 @@ static void mdflush_exit(void *ptr) { ebpf_module_t *em = (ebpf_module_t *)ptr; - if (em->objects) + if (em->enabled == NETDATA_THREAD_EBPF_FUNCTION_RUNNING) { + pthread_mutex_lock(&lock); + + ebpf_obsolete_mdflush_global(em); + + pthread_mutex_unlock(&lock); + fflush(stdout); + } + + ebpf_update_kernel_memory_with_vector(&plugin_statistics, em->maps, EBPF_ACTION_STAT_REMOVE); + + if (em->objects) { ebpf_unload_legacy_code(em->objects, em->probe_links); + em->objects = NULL; + em->probe_links = NULL; + } pthread_mutex_lock(&ebpf_exit_cleanup); em->enabled = NETDATA_THREAD_EBPF_STOPPED; + ebpf_update_stats(&plugin_statistics, em); pthread_mutex_unlock(&ebpf_exit_cleanup); } @@ -150,7 +276,7 @@ static void mdflush_read_count_map(int maps_per_core) if (v_is_new) { avl_t *check = avl_insert_lock(&mdflush_pub, (avl_t *)v); if (check != (avl_t *)v) { - error("Internal error, cannot insert the AVL tree."); + netdata_log_error("Internal error, cannot insert the AVL tree."); } } } @@ -209,7 +335,7 @@ static void mdflush_collector(ebpf_module_t *em) pthread_mutex_lock(&lock); mdflush_create_charts(update_every); ebpf_update_stats(&plugin_statistics, em); - ebpf_update_kernel_memory_with_vector(&plugin_statistics, em->maps); + ebpf_update_kernel_memory_with_vector(&plugin_statistics, em->maps, EBPF_ACTION_STAT_ADD); pthread_mutex_unlock(&lock); // loop and read from published data until ebpf plugin is closed. @@ -217,7 +343,9 @@ static void mdflush_collector(ebpf_module_t *em) heartbeat_init(&hb); int counter = update_every - 1; int maps_per_core = em->maps_per_core; - while (!ebpf_exit_plugin) { + uint32_t running_time = 0; + uint32_t lifetime = em->lifetime; + while (!ebpf_exit_plugin && running_time < lifetime) { (void)heartbeat_next(&hb, USEC_PER_SEC); if (ebpf_exit_plugin || ++counter != update_every) @@ -232,9 +360,61 @@ static void mdflush_collector(ebpf_module_t *em) write_end_chart(); pthread_mutex_unlock(&lock); + + pthread_mutex_lock(&ebpf_exit_cleanup); + if (running_time && !em->running_time) + running_time = update_every; + else + running_time += update_every; + + em->running_time = running_time; + pthread_mutex_unlock(&ebpf_exit_cleanup); + } +} + +/* + * Load BPF + * + * Load BPF files. + * + * @param em the structure with configuration + * + * @return It returns 0 on success and -1 otherwise. + */ +static int ebpf_mdflush_load_bpf(ebpf_module_t *em) +{ + int ret = 0; + if (em->load & EBPF_LOAD_LEGACY) { + em->probe_links = ebpf_load_program(ebpf_plugin_dir, em, running_on_kernel, isrh, &em->objects); + if (!em->probe_links) { + ret = -1; + } + } +#ifdef LIBBPF_MAJOR_VERSION + else { + mdflush_bpf_obj = mdflush_bpf__open(); + if (!mdflush_bpf_obj) + ret = -1; + else { + ret = ebpf_mdflush_load_and_attach(mdflush_bpf_obj, em); + if (ret && em->targets[NETDATA_MD_FLUSH_REQUEST].mode == EBPF_LOAD_TRAMPOLINE) { + mdflush_bpf__destroy(mdflush_bpf_obj); + mdflush_bpf_obj = mdflush_bpf__open(); + if (!mdflush_bpf_obj) + ret = -1; + else { + em->targets[NETDATA_MD_FLUSH_REQUEST].mode = EBPF_LOAD_PROBE; + ret = ebpf_mdflush_load_and_attach(mdflush_bpf_obj, em); + } + } + } } +#endif + + return ret; } + /** * mdflush thread. * @@ -250,15 +430,16 @@ void *ebpf_mdflush_thread(void *ptr) char *md_flush_request = ebpf_find_symbol("md_flush_request"); if (!md_flush_request) { - error("Cannot monitor MD devices, because md is not loaded."); + netdata_log_error("Cannot monitor MD devices, because md is not loaded."); goto endmdflush; } #ifdef LIBBPF_MAJOR_VERSION ebpf_define_map_type(em->maps, em->maps_per_core, running_on_kernel); + ebpf_adjust_thread_load(em, default_btf); #endif - em->probe_links = ebpf_load_program(ebpf_plugin_dir, em, running_on_kernel, isrh, &em->objects); - if (!em->probe_links) { + if (ebpf_mdflush_load_bpf(em)) { + netdata_log_error("Cannot load eBPF software."); goto endmdflush; } |