diff options
Diffstat (limited to 'collectors/ebpf.plugin/ebpf_shm.c')
| -rw-r--r-- | collectors/ebpf.plugin/ebpf_shm.c | 1137 |
1 files changed, 1137 insertions, 0 deletions
diff --git a/collectors/ebpf.plugin/ebpf_shm.c b/collectors/ebpf.plugin/ebpf_shm.c new file mode 100644 index 0000000..f81287d --- /dev/null +++ b/collectors/ebpf.plugin/ebpf_shm.c @@ -0,0 +1,1137 @@ +// SPDX-License-Identifier: GPL-3.0-or-later + +#include "ebpf.h" +#include "ebpf_shm.h" + +static char *shm_dimension_name[NETDATA_SHM_END] = { "get", "at", "dt", "ctl" }; +static netdata_syscall_stat_t shm_aggregated_data[NETDATA_SHM_END]; +static netdata_publish_syscall_t shm_publish_aggregated[NETDATA_SHM_END]; + +netdata_publish_shm_t *shm_vector = NULL; + +static netdata_idx_t shm_hash_values[NETDATA_SHM_END]; +static netdata_idx_t *shm_values = NULL; + +netdata_publish_shm_t **shm_pid = NULL; + +struct config shm_config = { .first_section = NULL, + .last_section = NULL, + .mutex = NETDATA_MUTEX_INITIALIZER, + .index = { .avl_tree = { .root = NULL, .compar = appconfig_section_compare }, + .rwlock = AVL_LOCK_INITIALIZER } }; + +static ebpf_local_maps_t shm_maps[] = {{.name = "tbl_pid_shm", .internal_input = ND_EBPF_DEFAULT_PID_SIZE, + .user_input = 0, + .type = NETDATA_EBPF_MAP_RESIZABLE | NETDATA_EBPF_MAP_PID, + .map_fd = ND_EBPF_MAP_FD_NOT_INITIALIZED}, + {.name = "shm_ctrl", .internal_input = NETDATA_CONTROLLER_END, + .user_input = 0, + .type = NETDATA_EBPF_MAP_CONTROLLER, + .map_fd = ND_EBPF_MAP_FD_NOT_INITIALIZED}, + {.name = "tbl_shm", .internal_input = NETDATA_SHM_END, + .user_input = 0, + .type = NETDATA_EBPF_MAP_STATIC, + .map_fd = ND_EBPF_MAP_FD_NOT_INITIALIZED}, + {.name = NULL, .internal_input = 0, .user_input = 0}}; + +struct netdata_static_thread shm_threads = { + .name = "SHM KERNEL", + .config_section = NULL, + .config_name = NULL, + .env_name = NULL, + .enabled = 1, + .thread = NULL, + .init_routine = NULL, + .start_routine = NULL +}; + +netdata_ebpf_targets_t shm_targets[] = { {.name = "shmget", .mode = EBPF_LOAD_TRAMPOLINE}, + {.name = "shmat", .mode = EBPF_LOAD_TRAMPOLINE}, + {.name = "shmdt", .mode = EBPF_LOAD_TRAMPOLINE}, + {.name = "shmctl", .mode = EBPF_LOAD_TRAMPOLINE}, + {.name = NULL, .mode = EBPF_LOAD_TRAMPOLINE}}; + +#ifdef LIBBPF_MAJOR_VERSION +#include "includes/shm.skel.h" + +static struct shm_bpf *bpf_obj = NULL; + +/***************************************************************** + * + * BTF FUNCTIONS + * + *****************************************************************/ + +/* + * Disable tracepoint + * + * Disable all tracepoints to use exclusively another method. + * + * @param obj is the main structure for bpf objects. + */ +static void ebpf_shm_disable_tracepoint(struct shm_bpf *obj) +{ + bpf_program__set_autoload(obj->progs.netdata_syscall_shmget, false); + bpf_program__set_autoload(obj->progs.netdata_syscall_shmat, false); + bpf_program__set_autoload(obj->progs.netdata_syscall_shmdt, false); + bpf_program__set_autoload(obj->progs.netdata_syscall_shmctl, false); +} + +/* + * Disable probe + * + * Disable all probes to use exclusively another method. + * + * @param obj is the main structure for bpf objects. + */ +static void ebpf_disable_probe(struct shm_bpf *obj) +{ + bpf_program__set_autoload(obj->progs.netdata_shmget_probe, false); + bpf_program__set_autoload(obj->progs.netdata_shmat_probe, false); + bpf_program__set_autoload(obj->progs.netdata_shmdt_probe, false); + bpf_program__set_autoload(obj->progs.netdata_shmctl_probe, false); + bpf_program__set_autoload(obj->progs.netdata_shm_release_task_probe, false); +} + +/* + * Disable trampoline + * + * Disable all trampoline to use exclusively another method. + * + * @param obj is the main structure for bpf objects. + */ +static void ebpf_disable_trampoline(struct shm_bpf *obj) +{ + bpf_program__set_autoload(obj->progs.netdata_shmget_fentry, false); + bpf_program__set_autoload(obj->progs.netdata_shmat_fentry, false); + bpf_program__set_autoload(obj->progs.netdata_shmdt_fentry, false); + bpf_program__set_autoload(obj->progs.netdata_shmctl_fentry, false); + bpf_program__set_autoload(obj->progs.netdata_shm_release_task_fentry, false); +} + +/** + * Set trampoline target + * + * Set the targets we will monitor. + * + * @param obj is the main structure for bpf objects. + */ +static void ebpf_set_trampoline_target(struct shm_bpf *obj) +{ + char syscall[NETDATA_EBPF_MAX_SYSCALL_LENGTH + 1]; + ebpf_select_host_prefix(syscall, NETDATA_EBPF_MAX_SYSCALL_LENGTH, + shm_targets[NETDATA_KEY_SHMGET_CALL].name, running_on_kernel); + + bpf_program__set_attach_target(obj->progs.netdata_shmget_fentry, 0, + syscall); + + ebpf_select_host_prefix(syscall, NETDATA_EBPF_MAX_SYSCALL_LENGTH, + shm_targets[NETDATA_KEY_SHMAT_CALL].name, running_on_kernel); + bpf_program__set_attach_target(obj->progs.netdata_shmat_fentry, 0, + syscall); + + ebpf_select_host_prefix(syscall, NETDATA_EBPF_MAX_SYSCALL_LENGTH, + shm_targets[NETDATA_KEY_SHMDT_CALL].name, running_on_kernel); + bpf_program__set_attach_target(obj->progs.netdata_shmdt_fentry, 0, + syscall); + + ebpf_select_host_prefix(syscall, NETDATA_EBPF_MAX_SYSCALL_LENGTH, + shm_targets[NETDATA_KEY_SHMCTL_CALL].name, running_on_kernel); + bpf_program__set_attach_target(obj->progs.netdata_shmctl_fentry, 0, + syscall); + + bpf_program__set_attach_target(obj->progs.netdata_shm_release_task_fentry, 0, + EBPF_COMMON_FNCT_CLEAN_UP); +} + +/** + * SHM Attach Probe + * + * Attach probes to target + * + * @param obj is the main structure for bpf objects. + * + * @return It returns 0 on success and -1 otherwise. + */ +static int ebpf_shm_attach_probe(struct shm_bpf *obj) +{ + char syscall[NETDATA_EBPF_MAX_SYSCALL_LENGTH + 1]; + ebpf_select_host_prefix(syscall, NETDATA_EBPF_MAX_SYSCALL_LENGTH, + shm_targets[NETDATA_KEY_SHMGET_CALL].name, running_on_kernel); + + obj->links.netdata_shmget_probe = bpf_program__attach_kprobe(obj->progs.netdata_shmget_probe, + false, syscall); + int ret = (int)libbpf_get_error(obj->links.netdata_shmget_probe); + if (ret) + return -1; + + ebpf_select_host_prefix(syscall, NETDATA_EBPF_MAX_SYSCALL_LENGTH, + shm_targets[NETDATA_KEY_SHMAT_CALL].name, running_on_kernel); + obj->links.netdata_shmat_probe = bpf_program__attach_kprobe(obj->progs.netdata_shmat_probe, + false, syscall); + ret = (int)libbpf_get_error(obj->links.netdata_shmat_probe); + if (ret) + return -1; + + ebpf_select_host_prefix(syscall, NETDATA_EBPF_MAX_SYSCALL_LENGTH, + shm_targets[NETDATA_KEY_SHMDT_CALL].name, running_on_kernel); + obj->links.netdata_shmdt_probe = bpf_program__attach_kprobe(obj->progs.netdata_shmdt_probe, + false, syscall); + ret = (int)libbpf_get_error(obj->links.netdata_shmdt_probe); + if (ret) + return -1; + + ebpf_select_host_prefix(syscall, NETDATA_EBPF_MAX_SYSCALL_LENGTH, + shm_targets[NETDATA_KEY_SHMCTL_CALL].name, running_on_kernel); + obj->links.netdata_shmctl_probe = bpf_program__attach_kprobe(obj->progs.netdata_shmctl_probe, + false, syscall); + ret = (int)libbpf_get_error(obj->links.netdata_shmctl_probe); + if (ret) + return -1; + + obj->links.netdata_shm_release_task_probe = bpf_program__attach_kprobe(obj->progs.netdata_shm_release_task_probe, + false, EBPF_COMMON_FNCT_CLEAN_UP); + ret = (int)libbpf_get_error(obj->links.netdata_shm_release_task_probe); + if (ret) + return -1; + + + return 0; +} + +/** + * Set hash tables + * + * Set the values for maps according the value given by kernel. + */ +static void ebpf_shm_set_hash_tables(struct shm_bpf *obj) +{ + shm_maps[NETDATA_PID_SHM_TABLE].map_fd = bpf_map__fd(obj->maps.tbl_pid_shm); + shm_maps[NETDATA_SHM_CONTROLLER].map_fd = bpf_map__fd(obj->maps.shm_ctrl); + shm_maps[NETDATA_SHM_GLOBAL_TABLE].map_fd = bpf_map__fd(obj->maps.tbl_shm); +} + +/** + * Disable Release Task + * + * Disable release task when apps is not enabled. + * + * @param obj is the main structure for bpf objects. + */ +static void ebpf_shm_disable_release_task(struct shm_bpf *obj) +{ + bpf_program__set_autoload(obj->progs.netdata_shm_release_task_probe, false); + bpf_program__set_autoload(obj->progs.netdata_shm_release_task_fentry, false); +} + +/** + * Adjust Map Size + * + * Resize maps according input from users. + * + * @param obj is the main structure for bpf objects. + * @param em structure with configuration + */ +static void ebpf_shm_adjust_map_size(struct shm_bpf *obj, ebpf_module_t *em) +{ + ebpf_update_map_size(obj->maps.tbl_pid_shm, &shm_maps[NETDATA_PID_SHM_TABLE], + em, bpf_map__name(obj->maps.tbl_pid_shm)); +} + +/** + * Load and attach + * + * Load and attach the eBPF code in kernel. + * + * @param obj is the main structure for bpf objects. + * @param em structure with configuration + * + * @return it returns 0 on succes and -1 otherwise + */ +static inline int ebpf_shm_load_and_attach(struct shm_bpf *obj, ebpf_module_t *em) +{ + netdata_ebpf_targets_t *shmt = em->targets; + netdata_ebpf_program_loaded_t test = shmt[NETDATA_KEY_SHMGET_CALL].mode; + + // We are testing only one, because all will have the same behavior + if (test == EBPF_LOAD_TRAMPOLINE ) { + ebpf_shm_disable_tracepoint(obj); + ebpf_disable_probe(obj); + + ebpf_set_trampoline_target(obj); + } else if (test == EBPF_LOAD_PROBE || test == EBPF_LOAD_RETPROBE ) { + ebpf_shm_disable_tracepoint(obj); + ebpf_disable_trampoline(obj); + } else { + ebpf_disable_probe(obj); + ebpf_disable_trampoline(obj); + } + + ebpf_shm_adjust_map_size(obj, em); + if (!em->apps_charts && !em->cgroup_charts) + ebpf_shm_disable_release_task(obj); + + int ret = shm_bpf__load(obj); + if (!ret) { + if (test != EBPF_LOAD_PROBE && test != EBPF_LOAD_RETPROBE) + shm_bpf__attach(obj); + else + ret = ebpf_shm_attach_probe(obj); + + if (!ret) + ebpf_shm_set_hash_tables(obj); + } + + return ret; +} +#endif +/***************************************************************** + * FUNCTIONS TO CLOSE THE THREAD + *****************************************************************/ + +/** + * SHM Free + * + * Cleanup variables after child threads to stop + * + * @param ptr thread data. + */ +static void ebpf_shm_free(ebpf_module_t *em) +{ + pthread_mutex_lock(&ebpf_exit_cleanup); + if (em->thread->enabled == NETDATA_THREAD_EBPF_RUNNING) { + em->thread->enabled = NETDATA_THREAD_EBPF_STOPPING; + pthread_mutex_unlock(&ebpf_exit_cleanup); + return; + } + pthread_mutex_unlock(&ebpf_exit_cleanup); + + ebpf_cleanup_publish_syscall(shm_publish_aggregated); + + freez(shm_vector); + freez(shm_values); + +#ifdef LIBBPF_MAJOR_VERSION + if (bpf_obj) + shm_bpf__destroy(bpf_obj); +#endif + + em->thread->enabled = NETDATA_THREAD_EBPF_STOPPED; +} + +/** + * SHM Exit + * + * Cancel child thread. + * + * @param ptr thread data. + */ +static void ebpf_shm_exit(void *ptr) +{ + ebpf_module_t *em = (ebpf_module_t *)ptr; + netdata_thread_cancel(*shm_threads.thread); + ebpf_shm_free(em); +} + +/** + * SHM Cleanup + * + * Clean up allocated memory. + * + * @param ptr thread data. + */ +static void ebpf_shm_cleanup(void *ptr) +{ + ebpf_module_t *em = (ebpf_module_t *)ptr; + ebpf_shm_free(em); +} + +/***************************************************************** + * COLLECTOR THREAD + *****************************************************************/ + +/** + * Apps Accumulator + * + * Sum all values read from kernel and store in the first address. + * + * @param out the vector with read values. + */ +static void shm_apps_accumulator(netdata_publish_shm_t *out) +{ + int i, end = (running_on_kernel >= NETDATA_KERNEL_V4_15) ? ebpf_nprocs : 1; + netdata_publish_shm_t *total = &out[0]; + for (i = 1; i < end; i++) { + netdata_publish_shm_t *w = &out[i]; + total->get += w->get; + total->at += w->at; + total->dt += w->dt; + total->ctl += w->ctl; + } +} + +/** + * Fill PID + * + * Fill PID structures + * + * @param current_pid pid that we are collecting data + * @param out values read from hash tables; + */ +static void shm_fill_pid(uint32_t current_pid, netdata_publish_shm_t *publish) +{ + netdata_publish_shm_t *curr = shm_pid[current_pid]; + if (!curr) { + curr = callocz(1, sizeof(netdata_publish_shm_t)); + shm_pid[current_pid] = curr; + } + + memcpy(curr, publish, sizeof(netdata_publish_shm_t)); +} + +/** + * Update cgroup + * + * Update cgroup data based in + */ +static void ebpf_update_shm_cgroup() +{ + netdata_publish_shm_t *cv = shm_vector; + int fd = shm_maps[NETDATA_PID_SHM_TABLE].map_fd; + size_t length = sizeof(netdata_publish_shm_t) * ebpf_nprocs; + ebpf_cgroup_target_t *ect; + + memset(cv, 0, length); + + pthread_mutex_lock(&mutex_cgroup_shm); + for (ect = ebpf_cgroup_pids; ect; ect = ect->next) { + struct pid_on_target2 *pids; + for (pids = ect->pids; pids; pids = pids->next) { + int pid = pids->pid; + netdata_publish_shm_t *out = &pids->shm; + if (likely(shm_pid) && shm_pid[pid]) { + netdata_publish_shm_t *in = shm_pid[pid]; + + memcpy(out, in, sizeof(netdata_publish_shm_t)); + } else { + if (!bpf_map_lookup_elem(fd, &pid, cv)) { + shm_apps_accumulator(cv); + + memcpy(out, cv, sizeof(netdata_publish_shm_t)); + + // now that we've consumed the value, zero it out in the map. + memset(cv, 0, length); + bpf_map_update_elem(fd, &pid, cv, BPF_EXIST); + } + } + } + } + pthread_mutex_unlock(&mutex_cgroup_shm); +} + +/** + * Read APPS table + * + * Read the apps table and store data inside the structure. + */ +static void read_apps_table() +{ + netdata_publish_shm_t *cv = shm_vector; + uint32_t key; + struct pid_stat *pids = root_of_pids; + int fd = shm_maps[NETDATA_PID_SHM_TABLE].map_fd; + size_t length = sizeof(netdata_publish_shm_t)*ebpf_nprocs; + while (pids) { + key = pids->pid; + + if (bpf_map_lookup_elem(fd, &key, cv)) { + pids = pids->next; + continue; + } + + shm_apps_accumulator(cv); + + shm_fill_pid(key, cv); + + // now that we've consumed the value, zero it out in the map. + memset(cv, 0, length); + bpf_map_update_elem(fd, &key, cv, BPF_EXIST); + + pids = pids->next; + } +} + +/** +* Send global charts to netdata agent. +*/ +static void shm_send_global() +{ + write_begin_chart(NETDATA_EBPF_SYSTEM_GROUP, NETDATA_SHM_GLOBAL_CHART); + write_chart_dimension( + shm_publish_aggregated[NETDATA_KEY_SHMGET_CALL].dimension, + (long long) shm_hash_values[NETDATA_KEY_SHMGET_CALL] + ); + write_chart_dimension( + shm_publish_aggregated[NETDATA_KEY_SHMAT_CALL].dimension, + (long long) shm_hash_values[NETDATA_KEY_SHMAT_CALL] + ); + write_chart_dimension( + shm_publish_aggregated[NETDATA_KEY_SHMDT_CALL].dimension, + (long long) shm_hash_values[NETDATA_KEY_SHMDT_CALL] + ); + write_chart_dimension( + shm_publish_aggregated[NETDATA_KEY_SHMCTL_CALL].dimension, + (long long) shm_hash_values[NETDATA_KEY_SHMCTL_CALL] + ); + write_end_chart(); +} + +/** + * Read global counter + * + * Read the table with number of calls for all functions + */ +static void read_global_table() +{ + netdata_idx_t *stored = shm_values; + netdata_idx_t *val = shm_hash_values; + int fd = shm_maps[NETDATA_SHM_GLOBAL_TABLE].map_fd; + + uint32_t i, end = NETDATA_SHM_END; + for (i = NETDATA_KEY_SHMGET_CALL; i < end; i++) { + if (!bpf_map_lookup_elem(fd, &i, stored)) { + int j; + int last = ebpf_nprocs; + netdata_idx_t total = 0; + for (j = 0; j < last; j++) + total += stored[j]; + + val[i] = total; + } + } +} + +/** + * Shared memory reader thread. + * + * @param ptr It is a NULL value for this thread. + * @return It always returns NULL. + */ +void *ebpf_shm_read_hash(void *ptr) +{ + netdata_thread_cleanup_push(ebpf_shm_cleanup, ptr); + heartbeat_t hb; + heartbeat_init(&hb); + + ebpf_module_t *em = (ebpf_module_t *)ptr; + usec_t step = NETDATA_SHM_SLEEP_MS * em->update_every; + while (!ebpf_exit_plugin) { + (void)heartbeat_next(&hb, step); + + read_global_table(); + } + + netdata_thread_cleanup_pop(1); + return NULL; +} + +/** + * Sum values for all targets. + */ +static void ebpf_shm_sum_pids(netdata_publish_shm_t *shm, struct pid_on_target *root) +{ + while (root) { + int32_t pid = root->pid; + netdata_publish_shm_t *w = shm_pid[pid]; + if (w) { + shm->get += w->get; + shm->at += w->at; + shm->dt += w->dt; + shm->ctl += w->ctl; + + // reset for next collection. + w->get = 0; + w->at = 0; + w->dt = 0; + w->ctl = 0; + } + root = root->next; + } +} + +/** + * Send data to Netdata calling auxiliary functions. + * + * @param root the target list. +*/ +void ebpf_shm_send_apps_data(struct target *root) +{ + struct target *w; + for (w = root; w; w = w->next) { + if (unlikely(w->exposed && w->processes)) { + ebpf_shm_sum_pids(&w->shm, w->root_pid); + } + } + + write_begin_chart(NETDATA_APPS_FAMILY, NETDATA_SHMGET_CHART); + for (w = root; w; w = w->next) { + if (unlikely(w->exposed && w->processes)) { + write_chart_dimension(w->name, (long long) w->shm.get); + } + } + write_end_chart(); + + write_begin_chart(NETDATA_APPS_FAMILY, NETDATA_SHMAT_CHART); + for (w = root; w; w = w->next) { + if (unlikely(w->exposed && w->processes)) { + write_chart_dimension(w->name, (long long) w->shm.at); + } + } + write_end_chart(); + + write_begin_chart(NETDATA_APPS_FAMILY, NETDATA_SHMDT_CHART); + for (w = root; w; w = w->next) { + if (unlikely(w->exposed && w->processes)) { + write_chart_dimension(w->name, (long long) w->shm.dt); + } + } + write_end_chart(); + + write_begin_chart(NETDATA_APPS_FAMILY, NETDATA_SHMCTL_CHART); + for (w = root; w; w = w->next) { + if (unlikely(w->exposed && w->processes)) { + write_chart_dimension(w->name, (long long) w->shm.ctl); + } + } + write_end_chart(); +} + +/** + * Sum values for all targets. + */ +static void ebpf_shm_sum_cgroup_pids(netdata_publish_shm_t *shm, struct pid_on_target2 *root) +{ + netdata_publish_shm_t shmv; + memset(&shmv, 0, sizeof(shmv)); + while (root) { + netdata_publish_shm_t *w = &root->shm; + shmv.get += w->get; + shmv.at += w->at; + shmv.dt += w->dt; + shmv.ctl += w->ctl; + + root = root->next; + } + + memcpy(shm, &shmv, sizeof(shmv)); +} + +/** + * Create specific shared memory charts + * + * Create charts for cgroup/application. + * + * @param type the chart type. + * @param update_every value to overwrite the update frequency set by the server. + */ +static void ebpf_create_specific_shm_charts(char *type, int update_every) +{ + ebpf_create_chart(type, NETDATA_SHMGET_CHART, + "Calls to syscall <code>shmget(2)</code>.", + EBPF_COMMON_DIMENSION_CALL, + NETDATA_APPS_IPC_SHM_GROUP, + NETDATA_CGROUP_SHM_GET_CONTEXT, + NETDATA_EBPF_CHART_TYPE_LINE, + NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5800, + ebpf_create_global_dimension, + &shm_publish_aggregated[NETDATA_KEY_SHMGET_CALL], + 1, + update_every, + NETDATA_EBPF_MODULE_NAME_SHM); + + ebpf_create_chart(type, NETDATA_SHMAT_CHART, + "Calls to syscall <code>shmat(2)</code>.", + EBPF_COMMON_DIMENSION_CALL, + NETDATA_APPS_IPC_SHM_GROUP, + NETDATA_CGROUP_SHM_AT_CONTEXT, + NETDATA_EBPF_CHART_TYPE_LINE, + NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5801, + ebpf_create_global_dimension, + &shm_publish_aggregated[NETDATA_KEY_SHMAT_CALL], + 1, + update_every, + NETDATA_EBPF_MODULE_NAME_SHM); + + ebpf_create_chart(type, NETDATA_SHMDT_CHART, + "Calls to syscall <code>shmdt(2)</code>.", + EBPF_COMMON_DIMENSION_CALL, + NETDATA_APPS_IPC_SHM_GROUP, + NETDATA_CGROUP_SHM_DT_CONTEXT, + NETDATA_EBPF_CHART_TYPE_LINE, + NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5802, + ebpf_create_global_dimension, + &shm_publish_aggregated[NETDATA_KEY_SHMDT_CALL], + 1, + update_every, + NETDATA_EBPF_MODULE_NAME_SHM); + + ebpf_create_chart(type, NETDATA_SHMCTL_CHART, + "Calls to syscall <code>shmctl(2)</code>.", + EBPF_COMMON_DIMENSION_CALL, + NETDATA_APPS_IPC_SHM_GROUP, + NETDATA_CGROUP_SHM_CTL_CONTEXT, + NETDATA_EBPF_CHART_TYPE_LINE, + NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5803, + ebpf_create_global_dimension, + &shm_publish_aggregated[NETDATA_KEY_SHMCTL_CALL], + 1, + update_every, + NETDATA_EBPF_MODULE_NAME_SHM); +} + +/** + * Obsolete specific shared memory charts + * + * Obsolete charts for cgroup/application. + * + * @param type the chart type. + * @param update_every value to overwrite the update frequency set by the server. + */ +static void ebpf_obsolete_specific_shm_charts(char *type, int update_every) +{ + ebpf_write_chart_obsolete(type, NETDATA_SHMGET_CHART, + "Calls to syscall <code>shmget(2)</code>.", + EBPF_COMMON_DIMENSION_CALL, + NETDATA_APPS_IPC_SHM_GROUP, + NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CGROUP_SHM_GET_CONTEXT, + NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5800, update_every); + + ebpf_write_chart_obsolete(type, NETDATA_SHMAT_CHART, + "Calls to syscall <code>shmat(2)</code>.", + EBPF_COMMON_DIMENSION_CALL, + NETDATA_APPS_IPC_SHM_GROUP, + NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CGROUP_SHM_AT_CONTEXT, + NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5801, update_every); + + ebpf_write_chart_obsolete(type, NETDATA_SHMDT_CHART, + "Calls to syscall <code>shmdt(2)</code>.", + EBPF_COMMON_DIMENSION_CALL, + NETDATA_APPS_IPC_SHM_GROUP, + NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CGROUP_SHM_DT_CONTEXT, + NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5802, update_every); + + ebpf_write_chart_obsolete(type, NETDATA_SHMCTL_CHART, + "Calls to syscall <code>shmctl(2)</code>.", + EBPF_COMMON_DIMENSION_CALL, + NETDATA_APPS_IPC_SHM_GROUP, + NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CGROUP_SHM_CTL_CONTEXT, + NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5803, update_every); +} + +/** + * Create Systemd Swap Charts + * + * Create charts when systemd is enabled + * + * @param update_every value to overwrite the update frequency set by the server. + **/ +static void ebpf_create_systemd_shm_charts(int update_every) +{ + ebpf_create_charts_on_systemd(NETDATA_SHMGET_CHART, + "Calls to syscall <code>shmget(2)</code>.", + EBPF_COMMON_DIMENSION_CALL, + NETDATA_APPS_IPC_SHM_GROUP, + NETDATA_EBPF_CHART_TYPE_STACKED, + 20191, + ebpf_algorithms[NETDATA_EBPF_INCREMENTAL_IDX], + NETDATA_SYSTEMD_SHM_GET_CONTEXT, NETDATA_EBPF_MODULE_NAME_SHM, update_every); + + ebpf_create_charts_on_systemd(NETDATA_SHMAT_CHART, + "Calls to syscall <code>shmat(2)</code>.", + EBPF_COMMON_DIMENSION_CALL, + NETDATA_APPS_IPC_SHM_GROUP, + NETDATA_EBPF_CHART_TYPE_STACKED, + 20192, + ebpf_algorithms[NETDATA_EBPF_INCREMENTAL_IDX], + NETDATA_SYSTEMD_SHM_AT_CONTEXT, NETDATA_EBPF_MODULE_NAME_SHM, update_every); + + ebpf_create_charts_on_systemd(NETDATA_SHMDT_CHART, + "Calls to syscall <code>shmdt(2)</code>.", + EBPF_COMMON_DIMENSION_CALL, + NETDATA_APPS_IPC_SHM_GROUP, + NETDATA_EBPF_CHART_TYPE_STACKED, + 20193, + ebpf_algorithms[NETDATA_EBPF_INCREMENTAL_IDX], + NETDATA_SYSTEMD_SHM_DT_CONTEXT, NETDATA_EBPF_MODULE_NAME_SHM, update_every); + + ebpf_create_charts_on_systemd(NETDATA_SHMCTL_CHART, + "Calls to syscall <code>shmctl(2)</code>.", + EBPF_COMMON_DIMENSION_CALL, + NETDATA_APPS_IPC_SHM_GROUP, + NETDATA_EBPF_CHART_TYPE_STACKED, + 20193, + ebpf_algorithms[NETDATA_EBPF_INCREMENTAL_IDX], + NETDATA_SYSTEMD_SHM_CTL_CONTEXT, NETDATA_EBPF_MODULE_NAME_SHM, update_every); +} + +/** + * Send Systemd charts + * + * Send collected data to Netdata. + */ +static void ebpf_send_systemd_shm_charts() +{ + ebpf_cgroup_target_t *ect; + write_begin_chart(NETDATA_SERVICE_FAMILY, NETDATA_SHMGET_CHART); + for (ect = ebpf_cgroup_pids; ect; ect = ect->next) { + if (unlikely(ect->systemd) && unlikely(ect->updated)) { + write_chart_dimension(ect->name, (long long)ect->publish_shm.get); + } + } + write_end_chart(); + + write_begin_chart(NETDATA_SERVICE_FAMILY, NETDATA_SHMAT_CHART); + for (ect = ebpf_cgroup_pids; ect; ect = ect->next) { + if (unlikely(ect->systemd) && unlikely(ect->updated)) { + write_chart_dimension(ect->name, (long long)ect->publish_shm.at); + } + } + write_end_chart(); + + write_begin_chart(NETDATA_SERVICE_FAMILY, NETDATA_SHMDT_CHART); + for (ect = ebpf_cgroup_pids; ect; ect = ect->next) { + if (unlikely(ect->systemd) && unlikely(ect->updated)) { + write_chart_dimension(ect->name, (long long)ect->publish_shm.dt); + } + } + write_end_chart(); + + write_begin_chart(NETDATA_SERVICE_FAMILY, NETDATA_SHMCTL_CHART); + for (ect = ebpf_cgroup_pids; ect; ect = ect->next) { + if (unlikely(ect->systemd) && unlikely(ect->updated)) { + write_chart_dimension(ect->name, (long long)ect->publish_shm.ctl); + } + } + write_end_chart(); +} + +/* + * Send Specific Shared memory data + * + * Send data for specific cgroup/apps. + * + * @param type chart type + * @param values structure with values that will be sent to netdata + */ +static void ebpf_send_specific_shm_data(char *type, netdata_publish_shm_t *values) +{ + write_begin_chart(type, NETDATA_SHMGET_CHART); + write_chart_dimension(shm_publish_aggregated[NETDATA_KEY_SHMGET_CALL].name, (long long)values->get); + write_end_chart(); + + write_begin_chart(type, NETDATA_SHMAT_CHART); + write_chart_dimension(shm_publish_aggregated[NETDATA_KEY_SHMAT_CALL].name, (long long)values->at); + write_end_chart(); + + write_begin_chart(type, NETDATA_SHMDT_CHART); + write_chart_dimension(shm_publish_aggregated[NETDATA_KEY_SHMDT_CALL].name, (long long)values->dt); + write_end_chart(); + + write_begin_chart(type, NETDATA_SHMCTL_CHART); + write_chart_dimension(shm_publish_aggregated[NETDATA_KEY_SHMCTL_CALL].name, (long long)values->ctl); + write_end_chart(); +} + +/** + * Send data to Netdata calling auxiliary functions. + * + * @param update_every value to overwrite the update frequency set by the server. +*/ +void ebpf_shm_send_cgroup_data(int update_every) +{ + if (!ebpf_cgroup_pids) + return; + + pthread_mutex_lock(&mutex_cgroup_shm); + ebpf_cgroup_target_t *ect; + for (ect = ebpf_cgroup_pids; ect ; ect = ect->next) { + ebpf_shm_sum_cgroup_pids(&ect->publish_shm, ect->pids); + } + + int has_systemd = shm_ebpf_cgroup.header->systemd_enabled; + if (has_systemd) { + if (send_cgroup_chart) { + ebpf_create_systemd_shm_charts(update_every); + } + + ebpf_send_systemd_shm_charts(); + } + + for (ect = ebpf_cgroup_pids; ect ; ect = ect->next) { + if (ect->systemd) + continue; + + if (!(ect->flags & NETDATA_EBPF_CGROUP_HAS_SHM_CHART) && ect->updated) { + ebpf_create_specific_shm_charts(ect->name, update_every); + ect->flags |= NETDATA_EBPF_CGROUP_HAS_SHM_CHART; + } + + if (ect->flags & NETDATA_EBPF_CGROUP_HAS_SHM_CHART) { + if (ect->updated) { + ebpf_send_specific_shm_data(ect->name, &ect->publish_shm); + } else { + ebpf_obsolete_specific_shm_charts(ect->name, update_every); + ect->flags &= ~NETDATA_EBPF_CGROUP_HAS_SWAP_CHART; + } + } + } + + pthread_mutex_unlock(&mutex_cgroup_shm); +} + +/** +* Main loop for this collector. +*/ +static void shm_collector(ebpf_module_t *em) +{ + shm_threads.thread = mallocz(sizeof(netdata_thread_t)); + shm_threads.start_routine = ebpf_shm_read_hash; + + netdata_thread_create( + shm_threads.thread, + shm_threads.name, + NETDATA_THREAD_OPTION_DEFAULT, + ebpf_shm_read_hash, + em + ); + + int cgroups = em->cgroup_charts; + int update_every = em->update_every; + heartbeat_t hb; + heartbeat_init(&hb); + usec_t step = update_every * USEC_PER_SEC; + while (!ebpf_exit_plugin) { + (void)heartbeat_next(&hb, step); + if (ebpf_exit_plugin) + break; + + netdata_apps_integration_flags_t apps = em->apps_charts; + pthread_mutex_lock(&collect_data_mutex); + if (apps) { + read_apps_table(); + } + + if (cgroups) { + ebpf_update_shm_cgroup(); + } + + pthread_mutex_lock(&lock); + + shm_send_global(); + + if (apps & NETDATA_EBPF_APPS_FLAG_CHART_CREATED) { + ebpf_shm_send_apps_data(apps_groups_root_target); + } + + if (cgroups) { + ebpf_shm_send_cgroup_data(update_every); + } + + pthread_mutex_unlock(&lock); + pthread_mutex_unlock(&collect_data_mutex); + } +} + +/***************************************************************** + * INITIALIZE THREAD + *****************************************************************/ + +/** + * Create apps charts + * + * Call ebpf_create_chart to create the charts on apps submenu. + * + * @param em a pointer to the structure with the default values. + */ +void ebpf_shm_create_apps_charts(struct ebpf_module *em, void *ptr) +{ + struct target *root = ptr; + ebpf_create_charts_on_apps(NETDATA_SHMGET_CHART, + "Calls to syscall <code>shmget(2)</code>.", + EBPF_COMMON_DIMENSION_CALL, + NETDATA_APPS_IPC_SHM_GROUP, + NETDATA_EBPF_CHART_TYPE_STACKED, + 20191, + ebpf_algorithms[NETDATA_EBPF_INCREMENTAL_IDX], + root, em->update_every, NETDATA_EBPF_MODULE_NAME_SHM); + + ebpf_create_charts_on_apps(NETDATA_SHMAT_CHART, + "Calls to syscall <code>shmat(2)</code>.", + EBPF_COMMON_DIMENSION_CALL, + NETDATA_APPS_IPC_SHM_GROUP, + NETDATA_EBPF_CHART_TYPE_STACKED, + 20192, + ebpf_algorithms[NETDATA_EBPF_INCREMENTAL_IDX], + root, em->update_every, NETDATA_EBPF_MODULE_NAME_SHM); + + ebpf_create_charts_on_apps(NETDATA_SHMDT_CHART, + "Calls to syscall <code>shmdt(2)</code>.", + EBPF_COMMON_DIMENSION_CALL, + NETDATA_APPS_IPC_SHM_GROUP, + NETDATA_EBPF_CHART_TYPE_STACKED, + 20193, + ebpf_algorithms[NETDATA_EBPF_INCREMENTAL_IDX], + root, em->update_every, NETDATA_EBPF_MODULE_NAME_SHM); + + ebpf_create_charts_on_apps(NETDATA_SHMCTL_CHART, + "Calls to syscall <code>shmctl(2)</code>.", + EBPF_COMMON_DIMENSION_CALL, + NETDATA_APPS_IPC_SHM_GROUP, + NETDATA_EBPF_CHART_TYPE_STACKED, + 20194, + ebpf_algorithms[NETDATA_EBPF_INCREMENTAL_IDX], + root, em->update_every, NETDATA_EBPF_MODULE_NAME_SHM); + + em->apps_charts |= NETDATA_EBPF_APPS_FLAG_CHART_CREATED; +} + +/** + * Allocate vectors used with this thread. + * + * We are not testing the return, because callocz does this and shutdown the software + * case it was not possible to allocate. + * + * @param apps is apps enabled? + */ +static void ebpf_shm_allocate_global_vectors(int apps) +{ + if (apps) + shm_pid = callocz((size_t)pid_max, sizeof(netdata_publish_shm_t *)); + + shm_vector = callocz((size_t)ebpf_nprocs, sizeof(netdata_publish_shm_t)); + + shm_values = callocz((size_t)ebpf_nprocs, sizeof(netdata_idx_t)); + + memset(shm_hash_values, 0, sizeof(shm_hash_values)); +} + +/***************************************************************** + * MAIN THREAD + *****************************************************************/ + +/** + * Create global charts + * + * Call ebpf_create_chart to create the charts for the collector. + * + * @param update_every value to overwrite the update frequency set by the server. + */ +static void ebpf_create_shm_charts(int update_every) +{ + ebpf_create_chart( + NETDATA_EBPF_SYSTEM_GROUP, + NETDATA_SHM_GLOBAL_CHART, + "Calls to shared memory system calls", + EBPF_COMMON_DIMENSION_CALL, + NETDATA_SYSTEM_IPC_SHM_SUBMENU, + NULL, + NETDATA_EBPF_CHART_TYPE_LINE, + NETDATA_CHART_PRIO_SYSTEM_IPC_SHARED_MEM_CALLS, + ebpf_create_global_dimension, + shm_publish_aggregated, + NETDATA_SHM_END, + update_every, NETDATA_EBPF_MODULE_NAME_SHM + ); + + fflush(stdout); +} + +/* + * Load BPF + * + * Load BPF files. + * + * @param em the structure with configuration + */ +static int ebpf_shm_load_bpf(ebpf_module_t *em) +{ + int ret = 0; + + ebpf_adjust_apps_cgroup(em, em->targets[NETDATA_KEY_SHMGET_CALL].mode); + 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) { + em->enabled = CONFIG_BOOLEAN_NO; + ret = -1; + } + } +#ifdef LIBBPF_MAJOR_VERSION + else { + bpf_obj = shm_bpf__open(); + if (!bpf_obj) + ret = -1; + else + ret = ebpf_shm_load_and_attach(bpf_obj, em); + } +#endif + + + if (ret) + error("%s %s", EBPF_DEFAULT_ERROR_MSG, em->thread_name); + + return ret; +} + +/** + * Shared memory thread. + * + * @param ptr a pointer to `struct ebpf_module` + * @return It always return NULL + */ +void *ebpf_shm_thread(void *ptr) +{ + netdata_thread_cleanup_push(ebpf_shm_exit, ptr); + + ebpf_module_t *em = (ebpf_module_t *)ptr; + em->maps = shm_maps; + + ebpf_update_pid_table(&shm_maps[NETDATA_PID_SHM_TABLE], em); + +#ifdef LIBBPF_MAJOR_VERSION + ebpf_adjust_thread_load(em, default_btf); +#endif + if (ebpf_shm_load_bpf(em)) { + em->thread->enabled = NETDATA_THREAD_EBPF_STOPPED; + goto endshm; + } + + ebpf_shm_allocate_global_vectors(em->apps_charts); + + int algorithms[NETDATA_SHM_END] = { + NETDATA_EBPF_INCREMENTAL_IDX, + NETDATA_EBPF_INCREMENTAL_IDX, + NETDATA_EBPF_INCREMENTAL_IDX, + NETDATA_EBPF_INCREMENTAL_IDX + }; + ebpf_global_labels( + shm_aggregated_data, + shm_publish_aggregated, + shm_dimension_name, + shm_dimension_name, + algorithms, + NETDATA_SHM_END + ); + + pthread_mutex_lock(&lock); + ebpf_create_shm_charts(em->update_every); + ebpf_update_stats(&plugin_statistics, em); + pthread_mutex_unlock(&lock); + + shm_collector(em); + +endshm: + ebpf_update_disabled_plugin_stats(em); + + netdata_thread_cleanup_pop(1); + return NULL; +} |