diff options
Diffstat (limited to 'collectors/ebpf.plugin/ebpf_sync.c')
| -rw-r--r-- | collectors/ebpf.plugin/ebpf_sync.c | 389 |
1 files changed, 389 insertions, 0 deletions
diff --git a/collectors/ebpf.plugin/ebpf_sync.c b/collectors/ebpf.plugin/ebpf_sync.c new file mode 100644 index 000000000..f0db1cc4a --- /dev/null +++ b/collectors/ebpf.plugin/ebpf_sync.c @@ -0,0 +1,389 @@ +// SPDX-License-Identifier: GPL-3.0-or-later + +#include "ebpf.h" +#include "ebpf_sync.h" + +static ebpf_data_t sync_data; + +static char *sync_counter_dimension_name[NETDATA_SYNC_IDX_END] = { "sync", "syncfs", "msync", "fsync", "fdatasync", + "sync_file_range" }; +static netdata_syscall_stat_t sync_counter_aggregated_data[NETDATA_SYNC_IDX_END]; +static netdata_publish_syscall_t sync_counter_publish_aggregated[NETDATA_SYNC_IDX_END]; + +static int read_thread_closed = 1; + +static netdata_idx_t sync_hash_values[NETDATA_SYNC_IDX_END]; + +struct netdata_static_thread sync_threads = {"SYNC KERNEL", NULL, NULL, 1, + NULL, NULL, NULL}; + +struct config sync_config = { .first_section = NULL, + .last_section = NULL, + .mutex = NETDATA_MUTEX_INITIALIZER, + .index = { .avl_tree = { .root = NULL, .compar = appconfig_section_compare }, + .rwlock = AVL_LOCK_INITIALIZER } }; + +ebpf_sync_syscalls_t local_syscalls[] = { + {.syscall = "sync", .enabled = CONFIG_BOOLEAN_YES, .objects = NULL, .probe_links = NULL}, + {.syscall = "syncfs", .enabled = CONFIG_BOOLEAN_YES, .objects = NULL, .probe_links = NULL}, + {.syscall = "msync", .enabled = CONFIG_BOOLEAN_YES, .objects = NULL, .probe_links = NULL}, + {.syscall = "fsync", .enabled = CONFIG_BOOLEAN_YES, .objects = NULL, .probe_links = NULL}, + {.syscall = "fdatasync", .enabled = CONFIG_BOOLEAN_YES, .objects = NULL, .probe_links = NULL}, + {.syscall = "sync_file_range", .enabled = CONFIG_BOOLEAN_YES, .objects = NULL, .probe_links = NULL}, + {.syscall = NULL, .enabled = CONFIG_BOOLEAN_NO, .objects = NULL, .probe_links = NULL} +}; + +/***************************************************************** + * + * INITIALIZE THREAD + * + *****************************************************************/ + +/* + * Initialize Syscalls + * + * Load the eBPF programs to monitor syscalls + * + * @return 0 on success and -1 otherwise. + */ +static int ebpf_sync_initialize_syscall(ebpf_module_t *em) +{ + int i; + const char *saved_name = em->thread_name; + for (i = 0; local_syscalls[i].syscall; i++) { + ebpf_sync_syscalls_t *w = &local_syscalls[i]; + if (!w->probe_links && w->enabled) { + fill_ebpf_data(&w->kernel_info); + if (ebpf_update_kernel(&w->kernel_info)) { + em->thread_name = saved_name; + error("Cannot update the kernel for eBPF module %s", w->syscall); + return -1; + } + + em->thread_name = w->syscall; + w->probe_links = ebpf_load_program(ebpf_plugin_dir, em, kernel_string, &w->objects, w->kernel_info.map_fd); + if (!w->probe_links) { + em->thread_name = saved_name; + return -1; + } + } + } + em->thread_name = saved_name; + + memset(sync_counter_aggregated_data, 0 , NETDATA_SYNC_IDX_END * sizeof(netdata_syscall_stat_t)); + memset(sync_counter_publish_aggregated, 0 , NETDATA_SYNC_IDX_END * sizeof(netdata_publish_syscall_t)); + memset(sync_hash_values, 0 , NETDATA_SYNC_IDX_END * sizeof(netdata_idx_t)); + + return 0; +} + +/***************************************************************** + * + * DATA THREAD + * + *****************************************************************/ + +/** + * Read global table + * + * Read the table with number of calls for all functions + */ +static void read_global_table() +{ + netdata_idx_t stored; + uint32_t idx = NETDATA_SYNC_CALL; + int i; + for (i = 0; local_syscalls[i].syscall; i++) { + if (local_syscalls[i].enabled) { + int fd = local_syscalls[i].kernel_info.map_fd[NETDATA_SYNC_GLOBLAL_TABLE]; + if (!bpf_map_lookup_elem(fd, &idx, &stored)) { + sync_hash_values[i] = stored; + } + } + } +} + +/** + * Sync read hash + * + * This is the thread callback. + * + * @param ptr It is a NULL value for this thread. + * + * @return It always returns NULL. + */ +void *ebpf_sync_read_hash(void *ptr) +{ + ebpf_module_t *em = (ebpf_module_t *)ptr; + read_thread_closed = 0; + + heartbeat_t hb; + heartbeat_init(&hb); + usec_t step = NETDATA_EBPF_SYNC_SLEEP_MS * em->update_time; + + while (!close_ebpf_plugin) { + usec_t dt = heartbeat_next(&hb, step); + (void)dt; + + read_global_table(); + } + read_thread_closed = 1; + + return NULL; +} + +/** + * Create Sync charts + * + * Create charts and dimensions according user input. + * + * @param id chart id + * @param idx the first index with data. + * @param end the last index with data. + */ +static void ebpf_send_sync_chart(char *id, + int idx, + int end) +{ + write_begin_chart(NETDATA_EBPF_MEMORY_GROUP, id); + + netdata_publish_syscall_t *move = &sync_counter_publish_aggregated[idx]; + + while (move && idx <= end) { + if (local_syscalls[idx].enabled) + write_chart_dimension(move->name, sync_hash_values[idx]); + + move = move->next; + idx++; + } + + write_end_chart(); +} + +/** + * Send data + * + * Send global charts to Netdata + */ +static void sync_send_data() +{ + if (local_syscalls[NETDATA_SYNC_FSYNC_IDX].enabled || local_syscalls[NETDATA_SYNC_FDATASYNC_IDX].enabled) { + ebpf_send_sync_chart(NETDATA_EBPF_FILE_SYNC_CHART, NETDATA_SYNC_FSYNC_IDX, NETDATA_SYNC_FDATASYNC_IDX); + } + + if (local_syscalls[NETDATA_SYNC_MSYNC_IDX].enabled) + ebpf_one_dimension_write_charts(NETDATA_EBPF_MEMORY_GROUP, NETDATA_EBPF_MSYNC_CHART, + sync_counter_publish_aggregated[NETDATA_SYNC_MSYNC_IDX].dimension, + sync_hash_values[NETDATA_SYNC_MSYNC_IDX]); + + if (local_syscalls[NETDATA_SYNC_SYNC_IDX].enabled || local_syscalls[NETDATA_SYNC_SYNCFS_IDX].enabled) { + ebpf_send_sync_chart(NETDATA_EBPF_SYNC_CHART, NETDATA_SYNC_SYNC_IDX, NETDATA_SYNC_SYNCFS_IDX); + } + + if (local_syscalls[NETDATA_SYNC_SYNC_FILE_RANGE_IDX].enabled) + ebpf_one_dimension_write_charts(NETDATA_EBPF_MEMORY_GROUP, NETDATA_EBPF_FILE_SEGMENT_CHART, + sync_counter_publish_aggregated[NETDATA_SYNC_SYNC_FILE_RANGE_IDX].dimension, + sync_hash_values[NETDATA_SYNC_SYNC_FILE_RANGE_IDX]); +} + +/** +* Main loop for this collector. +*/ +static void sync_collector(ebpf_module_t *em) +{ + sync_threads.thread = mallocz(sizeof(netdata_thread_t)); + sync_threads.start_routine = ebpf_sync_read_hash; + + netdata_thread_create(sync_threads.thread, sync_threads.name, NETDATA_THREAD_OPTION_JOINABLE, + ebpf_sync_read_hash, em); + + while (!close_ebpf_plugin) { + pthread_mutex_lock(&collect_data_mutex); + pthread_cond_wait(&collect_data_cond_var, &collect_data_mutex); + + pthread_mutex_lock(&lock); + + sync_send_data(); + + pthread_mutex_unlock(&lock); + pthread_mutex_unlock(&collect_data_mutex); + } +} + + +/***************************************************************** + * + * CLEANUP THREAD + * + *****************************************************************/ + +/** + * Cleanup Objects + * + * Cleanup loaded objects when thread was initialized. + */ +void ebpf_sync_cleanup_objects() +{ + int i; + for (i = 0; local_syscalls[i].syscall; i++) { + ebpf_sync_syscalls_t *w = &local_syscalls[i]; + if (w->probe_links) { + freez(w->kernel_info.map_fd); + + struct bpf_program *prog; + size_t j = 0 ; + bpf_object__for_each_program(prog, w->objects) { + bpf_link__destroy(w->probe_links[j]); + j++; + } + bpf_object__close(w->objects); + } + } +} + +/** + * Clean up the main thread. + * + * @param ptr thread data. + */ +static void ebpf_sync_cleanup(void *ptr) +{ + ebpf_module_t *em = (ebpf_module_t *)ptr; + if (!em->enabled) + return; + + heartbeat_t hb; + heartbeat_init(&hb); + uint32_t tick = 2*USEC_PER_MS; + while (!read_thread_closed) { + usec_t dt = heartbeat_next(&hb, tick); + UNUSED(dt); + } + + ebpf_sync_cleanup_objects(); + freez(sync_threads.thread); +} + +/***************************************************************** + * + * MAIN THREAD + * + *****************************************************************/ + +/** + * Create Sync charts + * + * Create charts and dimensions according user input. + * + * @param id chart id + * @param title chart title + * @param order order number of the specified chart + * @param idx the first index with data. + * @param end the last index with data. + */ +static void ebpf_create_sync_chart(char *id, + char *title, + int order, + int idx, + int end) +{ + ebpf_write_chart_cmd(NETDATA_EBPF_MEMORY_GROUP, id, title, EBPF_COMMON_DIMENSION_CALL, + NETDATA_EBPF_SYNC_SUBMENU, NETDATA_EBPF_CHART_TYPE_LINE, NULL, order); + + netdata_publish_syscall_t *move = &sync_counter_publish_aggregated[idx]; + + while (move && idx <= end) { + if (local_syscalls[idx].enabled) + ebpf_write_global_dimension(move->name, move->dimension, move->algorithm); + + move = move->next; + idx++; + } +} + +/** + * Create global charts + * + * Call ebpf_create_chart to create the charts for the collector. + */ +static void ebpf_create_sync_charts() +{ + if (local_syscalls[NETDATA_SYNC_FSYNC_IDX].enabled || local_syscalls[NETDATA_SYNC_FDATASYNC_IDX].enabled) + ebpf_create_sync_chart(NETDATA_EBPF_FILE_SYNC_CHART, + "Monitor calls for <code>fsync(2)</code> and <code>fdatasync(2)</code>.", 21300, + NETDATA_SYNC_FSYNC_IDX, NETDATA_SYNC_FDATASYNC_IDX); + + if (local_syscalls[NETDATA_SYNC_MSYNC_IDX].enabled) + ebpf_create_sync_chart(NETDATA_EBPF_MSYNC_CHART, + "Monitor calls for <code>msync(2)</code>.", 21301, + NETDATA_SYNC_MSYNC_IDX, NETDATA_SYNC_MSYNC_IDX); + + if (local_syscalls[NETDATA_SYNC_SYNC_IDX].enabled || local_syscalls[NETDATA_SYNC_SYNCFS_IDX].enabled) + ebpf_create_sync_chart(NETDATA_EBPF_SYNC_CHART, + "Monitor calls for <code>sync(2)</code> and <code>syncfs(2)</code>.", 21302, + NETDATA_SYNC_SYNC_IDX, NETDATA_SYNC_SYNCFS_IDX); + + if (local_syscalls[NETDATA_SYNC_SYNC_FILE_RANGE_IDX].enabled) + ebpf_create_sync_chart(NETDATA_EBPF_FILE_SEGMENT_CHART, + "Monitor calls for <code>sync_file_range(2)</code>.", 21303, + NETDATA_SYNC_SYNC_FILE_RANGE_IDX, NETDATA_SYNC_SYNC_FILE_RANGE_IDX); +} + +/** + * Parse Syscalls + * + * Parse syscall options available inside ebpf.d/sync.conf + */ +static void ebpf_sync_parse_syscalls() +{ + int i; + for (i = 0; local_syscalls[i].syscall; i++) { + local_syscalls[i].enabled = appconfig_get_boolean(&sync_config, NETDATA_SYNC_CONFIG_NAME, + local_syscalls[i].syscall, CONFIG_BOOLEAN_YES); + } +} + +/** + * Sync thread + * + * Thread used to make sync thread + * + * @param ptr a pointer to `struct ebpf_module` + * + * @return It always return NULL + */ +void *ebpf_sync_thread(void *ptr) +{ + netdata_thread_cleanup_push(ebpf_sync_cleanup, ptr); + + ebpf_module_t *em = (ebpf_module_t *)ptr; + fill_ebpf_data(&sync_data); + + ebpf_update_module(em, &sync_config, NETDATA_SYNC_CONFIG_FILE); + ebpf_sync_parse_syscalls(); + + if (!em->enabled) + goto endsync; + + if (ebpf_sync_initialize_syscall(em)) { + pthread_mutex_unlock(&lock); + goto endsync; + } + + int algorithms[NETDATA_SYNC_IDX_END] = { NETDATA_EBPF_INCREMENTAL_IDX, NETDATA_EBPF_INCREMENTAL_IDX, + NETDATA_EBPF_INCREMENTAL_IDX, NETDATA_EBPF_INCREMENTAL_IDX, + NETDATA_EBPF_INCREMENTAL_IDX, NETDATA_EBPF_INCREMENTAL_IDX }; + ebpf_global_labels(sync_counter_aggregated_data, sync_counter_publish_aggregated, + sync_counter_dimension_name, sync_counter_dimension_name, + algorithms, NETDATA_SYNC_IDX_END); + + pthread_mutex_lock(&lock); + ebpf_create_sync_charts(); + pthread_mutex_unlock(&lock); + + sync_collector(em); + +endsync: + netdata_thread_cleanup_pop(1); + return NULL; +} |