diff options
Diffstat (limited to '')
| -rw-r--r-- | collectors/ebpf.plugin/ebpf_swap.c | 1030 |
1 files changed, 1030 insertions, 0 deletions
diff --git a/collectors/ebpf.plugin/ebpf_swap.c b/collectors/ebpf.plugin/ebpf_swap.c new file mode 100644 index 00000000..fb007f92 --- /dev/null +++ b/collectors/ebpf.plugin/ebpf_swap.c @@ -0,0 +1,1030 @@ +// SPDX-License-Identifier: GPL-3.0-or-later + +#include "ebpf.h" +#include "ebpf_swap.h" + +static char *swap_dimension_name[NETDATA_SWAP_END] = { "read", "write" }; +static netdata_syscall_stat_t swap_aggregated_data[NETDATA_SWAP_END]; +static netdata_publish_syscall_t swap_publish_aggregated[NETDATA_SWAP_END]; + +static netdata_idx_t swap_hash_values[NETDATA_SWAP_END]; +static netdata_idx_t *swap_values = NULL; + +netdata_publish_swap_t *swap_vector = NULL; + +struct config swap_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 swap_maps[] = {{.name = "tbl_pid_swap", .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, +#ifdef LIBBPF_MAJOR_VERSION + .map_type = BPF_MAP_TYPE_PERCPU_HASH +#endif + }, + {.name = "swap_ctrl", .internal_input = NETDATA_CONTROLLER_END, + .user_input = 0, + .type = NETDATA_EBPF_MAP_CONTROLLER, + .map_fd = ND_EBPF_MAP_FD_NOT_INITIALIZED, +#ifdef LIBBPF_MAJOR_VERSION + .map_type = BPF_MAP_TYPE_PERCPU_ARRAY +#endif + }, + {.name = "tbl_swap", .internal_input = NETDATA_SWAP_END, + .user_input = 0, + .type = NETDATA_EBPF_MAP_STATIC, + .map_fd = ND_EBPF_MAP_FD_NOT_INITIALIZED, +#ifdef LIBBPF_MAJOR_VERSION + .map_type = BPF_MAP_TYPE_PERCPU_ARRAY +#endif + }, + {.name = NULL, .internal_input = 0, .user_input = 0, +#ifdef LIBBPF_MAJOR_VERSION + .map_type = BPF_MAP_TYPE_PERCPU_ARRAY +#endif + }}; + +netdata_ebpf_targets_t swap_targets[] = { {.name = "swap_readpage", .mode = EBPF_LOAD_TRAMPOLINE}, + {.name = "swap_writepage", .mode = EBPF_LOAD_TRAMPOLINE}, + {.name = NULL, .mode = EBPF_LOAD_TRAMPOLINE}}; + +#ifdef LIBBPF_MAJOR_VERSION +/** + * Disable probe + * + * Disable all probes to use exclusively another method. + * + * @param obj is the main structure for bpf objects + */ +static void ebpf_swap_disable_probe(struct swap_bpf *obj) +{ + bpf_program__set_autoload(obj->progs.netdata_swap_readpage_probe, false); + bpf_program__set_autoload(obj->progs.netdata_swap_writepage_probe, false); +} + +/* + * Disable trampoline + * + * Disable all trampoline to use exclusively another method. + * + * @param obj is the main structure for bpf objects. + */ +static void ebpf_swap_disable_trampoline(struct swap_bpf *obj) +{ + bpf_program__set_autoload(obj->progs.netdata_swap_readpage_fentry, false); + bpf_program__set_autoload(obj->progs.netdata_swap_writepage_fentry, false); + bpf_program__set_autoload(obj->progs.netdata_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_swap_set_trampoline_target(struct swap_bpf *obj) +{ + bpf_program__set_attach_target(obj->progs.netdata_swap_readpage_fentry, 0, + swap_targets[NETDATA_KEY_SWAP_READPAGE_CALL].name); + + bpf_program__set_attach_target(obj->progs.netdata_swap_writepage_fentry, 0, + swap_targets[NETDATA_KEY_SWAP_WRITEPAGE_CALL].name); + + bpf_program__set_attach_target(obj->progs.netdata_release_task_fentry, 0, + EBPF_COMMON_FNCT_CLEAN_UP); +} + +/** + * Mount 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_swap_attach_kprobe(struct swap_bpf *obj) +{ + obj->links.netdata_swap_readpage_probe = bpf_program__attach_kprobe(obj->progs.netdata_swap_readpage_probe, + false, + swap_targets[NETDATA_KEY_SWAP_READPAGE_CALL].name); + int ret = libbpf_get_error(obj->links.netdata_swap_readpage_probe); + if (ret) + return -1; + + obj->links.netdata_swap_writepage_probe = bpf_program__attach_kprobe(obj->progs.netdata_swap_writepage_probe, + false, + swap_targets[NETDATA_KEY_SWAP_WRITEPAGE_CALL].name); + ret = libbpf_get_error(obj->links.netdata_swap_writepage_probe); + if (ret) + return -1; + + return 0; +} + +/** + * Set hash tables + * + * Set the values for maps according the value given by kernel. + * + * @param obj is the main structure for bpf objects. + */ +static void ebpf_swap_set_hash_tables(struct swap_bpf *obj) +{ + swap_maps[NETDATA_PID_SWAP_TABLE].map_fd = bpf_map__fd(obj->maps.tbl_pid_swap); + swap_maps[NETDATA_SWAP_CONTROLLER].map_fd = bpf_map__fd(obj->maps.swap_ctrl); + swap_maps[NETDATA_SWAP_GLOBAL_TABLE].map_fd = bpf_map__fd(obj->maps.tbl_swap); +} + +/** + * Adjust Map + * + * Resize maps according input from users. + * + * @param obj is the main structure for bpf objects. + * @param em structure with configuration + */ +static void ebpf_swap_adjust_map(struct swap_bpf *obj, ebpf_module_t *em) +{ + ebpf_update_map_size(obj->maps.tbl_pid_swap, &swap_maps[NETDATA_PID_SWAP_TABLE], + em, bpf_map__name(obj->maps.tbl_pid_swap)); + + ebpf_update_map_type(obj->maps.tbl_pid_swap, &swap_maps[NETDATA_PID_SWAP_TABLE]); + ebpf_update_map_type(obj->maps.tbl_swap, &swap_maps[NETDATA_SWAP_GLOBAL_TABLE]); + ebpf_update_map_type(obj->maps.swap_ctrl, &swap_maps[NETDATA_SWAP_CONTROLLER]); +} + +/** + * Disable Release Task + * + * Disable release task when apps is not enabled. + * + * @param obj is the main structure for bpf objects. + */ +static void ebpf_swap_disable_release_task(struct swap_bpf *obj) +{ + bpf_program__set_autoload(obj->progs.netdata_release_task_fentry, false); +} + +/** + * 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 success and -1 otherwise + */ +static inline int ebpf_swap_load_and_attach(struct swap_bpf *obj, ebpf_module_t *em) +{ + netdata_ebpf_targets_t *mt = em->targets; + netdata_ebpf_program_loaded_t test = mt[NETDATA_KEY_SWAP_READPAGE_CALL].mode; + + if (test == EBPF_LOAD_TRAMPOLINE) { + ebpf_swap_disable_probe(obj); + + ebpf_swap_set_trampoline_target(obj); + } else { + ebpf_swap_disable_trampoline(obj); + } + + ebpf_swap_adjust_map(obj, em); + + if (!em->apps_charts && !em->cgroup_charts) + ebpf_swap_disable_release_task(obj); + + int ret = swap_bpf__load(obj); + if (ret) { + return ret; + } + + ret = (test == EBPF_LOAD_TRAMPOLINE) ? swap_bpf__attach(obj) : ebpf_swap_attach_kprobe(obj); + if (!ret) { + ebpf_swap_set_hash_tables(obj); + + ebpf_update_controller(swap_maps[NETDATA_SWAP_CONTROLLER].map_fd, em); + } + + return ret; +} +#endif + +/***************************************************************** + * + * FUNCTIONS TO CLOSE THE THREAD + * + *****************************************************************/ + +static void ebpf_obsolete_specific_swap_charts(char *type, int update_every); + +/** + * Obsolete services + * + * Obsolete all service charts created + * + * @param em a pointer to `struct ebpf_module` + */ +static void ebpf_obsolete_swap_services(ebpf_module_t *em) +{ + ebpf_write_chart_obsolete(NETDATA_SERVICE_FAMILY, + NETDATA_MEM_SWAP_READ_CHART, + "", + "Calls to function swap_readpage.", + EBPF_COMMON_DIMENSION_CALL, + NETDATA_SYSTEM_CGROUP_SWAP_SUBMENU, + NETDATA_EBPF_CHART_TYPE_LINE, + NETDATA_CGROUP_SWAP_READ_CONTEXT, + NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5100, + em->update_every); + + ebpf_write_chart_obsolete(NETDATA_SERVICE_FAMILY, + NETDATA_MEM_SWAP_WRITE_CHART, + "", + "Calls to function swap_writepage.", + EBPF_COMMON_DIMENSION_CALL, + NETDATA_SYSTEM_CGROUP_SWAP_SUBMENU, + NETDATA_EBPF_CHART_TYPE_LINE, + NETDATA_CGROUP_SWAP_WRITE_CONTEXT, + NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5101, + em->update_every); +} + +/** + * Obsolete cgroup chart + * + * Send obsolete for all charts created before to close. + * + * @param em a pointer to `struct ebpf_module` + */ +static inline void ebpf_obsolete_swap_cgroup_charts(ebpf_module_t *em) { + pthread_mutex_lock(&mutex_cgroup_shm); + + ebpf_obsolete_swap_services(em); + + ebpf_cgroup_target_t *ect; + for (ect = ebpf_cgroup_pids; ect ; ect = ect->next) { + if (ect->systemd) + continue; + + ebpf_obsolete_specific_swap_charts(ect->name, em->update_every); + } + pthread_mutex_unlock(&mutex_cgroup_shm); +} + +/** + * Obsolette apps charts + * + * Obsolete apps charts. + * + * @param em a pointer to the structure with the default values. + */ +void ebpf_obsolete_swap_apps_charts(struct ebpf_module *em) +{ + struct ebpf_target *w; + int update_every = em->update_every; + for (w = apps_groups_root_target; w; w = w->next) { + if (unlikely(!(w->charts_created & (1<<EBPF_MODULE_SWAP_IDX)))) + continue; + + ebpf_write_chart_obsolete(NETDATA_APP_FAMILY, + w->clean_name, + "_ebpf_call_swap_readpage", + "Calls to function swap_readpage.", + EBPF_COMMON_DIMENSION_CALL, + NETDATA_EBPF_MEMORY_GROUP, + NETDATA_EBPF_CHART_TYPE_STACKED, + "app.ebpf_call_swap_readpage", + 20070, + update_every); + + ebpf_write_chart_obsolete(NETDATA_APP_FAMILY, + w->clean_name, + "_ebpf_call_swap_writepage", + "Calls to function swap_writepage.", + EBPF_COMMON_DIMENSION_CALL, + NETDATA_EBPF_MEMORY_GROUP, + NETDATA_EBPF_CHART_TYPE_STACKED, + "app.ebpf_call_swap_writepage", + 20071, + update_every); + w->charts_created &= ~(1<<EBPF_MODULE_SWAP_IDX); + } +} + +/** + * Obsolete global + * + * Obsolete global charts created by thread. + * + * @param em a pointer to `struct ebpf_module` + */ +static void ebpf_obsolete_swap_global(ebpf_module_t *em) +{ + ebpf_write_chart_obsolete(NETDATA_EBPF_MEMORY_GROUP, + NETDATA_MEM_SWAP_CHART, + "", + "Calls to access swap memory", + EBPF_COMMON_DIMENSION_CALL, NETDATA_SYSTEM_SWAP_SUBMENU, + NETDATA_EBPF_CHART_TYPE_LINE, + NULL, + NETDATA_CHART_PRIO_MEM_SWAP_CALLS, + em->update_every); +} + +/** + * Swap exit + * + * Cancel thread and exit. + * + * @param ptr thread data. + */ +static void ebpf_swap_exit(void *ptr) +{ + ebpf_module_t *em = (ebpf_module_t *)ptr; + + if (em->enabled == NETDATA_THREAD_EBPF_FUNCTION_RUNNING) { + pthread_mutex_lock(&lock); + if (em->cgroup_charts) { + ebpf_obsolete_swap_cgroup_charts(em); + fflush(stdout); + } + + if (em->apps_charts & NETDATA_EBPF_APPS_FLAG_CHART_CREATED) { + ebpf_obsolete_swap_apps_charts(em); + } + + ebpf_obsolete_swap_global(em); + + fflush(stdout); + pthread_mutex_unlock(&lock); + } + + ebpf_update_kernel_memory_with_vector(&plugin_statistics, em->maps, EBPF_ACTION_STAT_REMOVE); + +#ifdef LIBBPF_MAJOR_VERSION + if (bpf_obj) { + swap_bpf__destroy(bpf_obj); + bpf_obj = NULL; + } +#endif + 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); +} + +/***************************************************************** + * + * COLLECTOR THREAD + * + *****************************************************************/ + +/** + * Apps Accumulator + * + * Sum all values read from kernel and store in the first address. + * + * @param out the vector with read values. + * @param maps_per_core do I need to read all cores? + */ +static void swap_apps_accumulator(netdata_publish_swap_t *out, int maps_per_core) +{ + int i, end = (maps_per_core) ? ebpf_nprocs : 1; + netdata_publish_swap_t *total = &out[0]; + for (i = 1; i < end; i++) { + netdata_publish_swap_t *w = &out[i]; + total->write += w->write; + total->read += w->read; + } +} + +/** + * Fill PID + * + * Fill PID structures + * + * @param current_pid pid that we are collecting data + * @param out values read from hash tables; + */ +static void swap_fill_pid(uint32_t current_pid, netdata_publish_swap_t *publish) +{ + netdata_publish_swap_t *curr = swap_pid[current_pid]; + if (!curr) { + curr = callocz(1, sizeof(netdata_publish_swap_t)); + swap_pid[current_pid] = curr; + } + + memcpy(curr, publish, sizeof(netdata_publish_swap_t)); +} + +/** + * Update cgroup + * + * Update cgroup data based in + * + * @param maps_per_core do I need to read all cores? + */ +static void ebpf_update_swap_cgroup(int maps_per_core) +{ + ebpf_cgroup_target_t *ect ; + netdata_publish_swap_t *cv = swap_vector; + int fd = swap_maps[NETDATA_PID_SWAP_TABLE].map_fd; + size_t length = sizeof(netdata_publish_swap_t); + if (maps_per_core) + length *= ebpf_nprocs; + 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_swap_t *out = &pids->swap; + if (likely(swap_pid) && swap_pid[pid]) { + netdata_publish_swap_t *in = swap_pid[pid]; + + memcpy(out, in, sizeof(netdata_publish_swap_t)); + } else { + memset(cv, 0, length); + if (!bpf_map_lookup_elem(fd, &pid, cv)) { + swap_apps_accumulator(cv, maps_per_core); + + memcpy(out, cv, sizeof(netdata_publish_swap_t)); + + // We are cleaning to avoid passing data read from one process to other. + memset(cv, 0, length); + } + } + } + } + pthread_mutex_unlock(&mutex_cgroup_shm); +} + +/** + * Read APPS table + * + * Read the apps table and store data inside the structure. + * + * @param maps_per_core do I need to read all cores? + */ +static void read_swap_apps_table(int maps_per_core) +{ + netdata_publish_swap_t *cv = swap_vector; + uint32_t key; + struct ebpf_pid_stat *pids = ebpf_root_of_pids; + int fd = swap_maps[NETDATA_PID_SWAP_TABLE].map_fd; + size_t length = sizeof(netdata_publish_swap_t); + if (maps_per_core) + length *= ebpf_nprocs; + while (pids) { + key = pids->pid; + + if (bpf_map_lookup_elem(fd, &key, cv)) { + pids = pids->next; + continue; + } + + swap_apps_accumulator(cv, maps_per_core); + + swap_fill_pid(key, cv); + + // We are cleaning to avoid passing data read from one process to other. + memset(cv, 0, length); + + pids = pids->next; + } +} + +/** +* Send global +* +* Send global charts to Netdata +*/ +static void swap_send_global() +{ + write_io_chart(NETDATA_MEM_SWAP_CHART, NETDATA_EBPF_MEMORY_GROUP, + swap_publish_aggregated[NETDATA_KEY_SWAP_WRITEPAGE_CALL].dimension, + (long long) swap_hash_values[NETDATA_KEY_SWAP_WRITEPAGE_CALL], + swap_publish_aggregated[NETDATA_KEY_SWAP_READPAGE_CALL].dimension, + (long long) swap_hash_values[NETDATA_KEY_SWAP_READPAGE_CALL]); +} + +/** + * Read global counter + * + * Read the table with number of calls to all functions + * + * @param stats vector used to read data from control table. + * @param maps_per_core do I need to read all cores? + */ +static void ebpf_swap_read_global_table(netdata_idx_t *stats, int maps_per_core) +{ + ebpf_read_global_table_stats(swap_hash_values, + swap_values, + swap_maps[NETDATA_SWAP_GLOBAL_TABLE].map_fd, + maps_per_core, + NETDATA_KEY_SWAP_READPAGE_CALL, + NETDATA_SWAP_END); + + ebpf_read_global_table_stats(stats, + swap_values, + swap_maps[NETDATA_SWAP_CONTROLLER].map_fd, + maps_per_core, + NETDATA_CONTROLLER_PID_TABLE_ADD, + NETDATA_CONTROLLER_END); +} + +/** + * Sum PIDs + * + * Sum values for all targets. + * + * @param swap + * @param root + */ +static void ebpf_swap_sum_pids(netdata_publish_swap_t *swap, struct ebpf_pid_on_target *root) +{ + uint64_t local_read = 0; + uint64_t local_write = 0; + + while (root) { + int32_t pid = root->pid; + netdata_publish_swap_t *w = swap_pid[pid]; + if (w) { + local_write += w->write; + local_read += w->read; + } + root = root->next; + } + + // These conditions were added, because we are using incremental algorithm + swap->write = (local_write >= swap->write) ? local_write : swap->write; + swap->read = (local_read >= swap->read) ? local_read : swap->read; +} + +/** + * Send data to Netdata calling auxiliary functions. + * + * @param root the target list. +*/ +void ebpf_swap_send_apps_data(struct ebpf_target *root) +{ + struct ebpf_target *w; + for (w = root; w; w = w->next) { + if (unlikely(!(w->charts_created & (1<<EBPF_MODULE_SWAP_IDX)))) + continue; + + ebpf_swap_sum_pids(&w->swap, w->root_pid); + + ebpf_write_begin_chart(NETDATA_APP_FAMILY, w->clean_name, "_ebpf_call_swap_readpage"); + write_chart_dimension("calls", (long long) w->swap.read); + ebpf_write_end_chart(); + + ebpf_write_begin_chart(NETDATA_APP_FAMILY, w->clean_name, "_ebpf_call_swap_writepage"); + write_chart_dimension("calls", (long long) w->swap.write); + ebpf_write_end_chart(); + } +} + +/** + * Sum PIDs + * + * Sum values for all targets. + * + * @param swap + * @param root + */ +static void ebpf_swap_sum_cgroup_pids(netdata_publish_swap_t *swap, struct pid_on_target2 *pids) +{ + uint64_t local_read = 0; + uint64_t local_write = 0; + + while (pids) { + netdata_publish_swap_t *w = &pids->swap; + local_write += w->write; + local_read += w->read; + + pids = pids->next; + } + + // These conditions were added, because we are using incremental algorithm + swap->write = (local_write >= swap->write) ? local_write : swap->write; + swap->read = (local_read >= swap->read) ? local_read : swap->read; +} + +/** + * Send Systemd charts + * + * Send collected data to Netdata. + */ +static void ebpf_send_systemd_swap_charts() +{ + ebpf_cgroup_target_t *ect; + ebpf_write_begin_chart(NETDATA_SERVICE_FAMILY, NETDATA_MEM_SWAP_READ_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_systemd_swap.read); + } + } + ebpf_write_end_chart(); + + ebpf_write_begin_chart(NETDATA_SERVICE_FAMILY, NETDATA_MEM_SWAP_WRITE_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_systemd_swap.write); + } + } + ebpf_write_end_chart(); +} + +/** + * Create specific swap 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_swap_charts(char *type, int update_every) +{ + ebpf_create_chart(type, NETDATA_MEM_SWAP_READ_CHART, + "Calls to function swap_readpage.", + EBPF_COMMON_DIMENSION_CALL, NETDATA_SYSTEM_CGROUP_SWAP_SUBMENU, + NETDATA_CGROUP_SWAP_READ_CONTEXT, NETDATA_EBPF_CHART_TYPE_LINE, + NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5100, + ebpf_create_global_dimension, + swap_publish_aggregated, 1, update_every, NETDATA_EBPF_MODULE_NAME_SWAP); + + ebpf_create_chart(type, NETDATA_MEM_SWAP_WRITE_CHART, + "Calls to function swap_writepage.", + EBPF_COMMON_DIMENSION_CALL, NETDATA_SYSTEM_CGROUP_SWAP_SUBMENU, + NETDATA_CGROUP_SWAP_WRITE_CONTEXT, NETDATA_EBPF_CHART_TYPE_LINE, + NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5101, + ebpf_create_global_dimension, + &swap_publish_aggregated[NETDATA_KEY_SWAP_WRITEPAGE_CALL], 1, + update_every, NETDATA_EBPF_MODULE_NAME_SWAP); +} + +/** + * Create specific swap 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_obsolete_specific_swap_charts(char *type, int update_every) +{ + ebpf_write_chart_obsolete(type, NETDATA_MEM_SWAP_READ_CHART, "", "Calls to function swap_readpage.", + EBPF_COMMON_DIMENSION_CALL, NETDATA_SYSTEM_CGROUP_SWAP_SUBMENU, + NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CGROUP_SWAP_READ_CONTEXT, + NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5100, update_every); + + ebpf_write_chart_obsolete(type, NETDATA_MEM_SWAP_WRITE_CHART, "", "Calls to function swap_writepage.", + EBPF_COMMON_DIMENSION_CALL, NETDATA_SYSTEM_CGROUP_SWAP_SUBMENU, + NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CGROUP_SWAP_WRITE_CONTEXT, + NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5101, update_every); +} + +/* + * Send Specific Swap 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_swap_data(char *type, netdata_publish_swap_t *values) +{ + ebpf_write_begin_chart(type, NETDATA_MEM_SWAP_READ_CHART, ""); + write_chart_dimension(swap_publish_aggregated[NETDATA_KEY_SWAP_READPAGE_CALL].name, (long long) values->read); + ebpf_write_end_chart(); + + ebpf_write_begin_chart(type, NETDATA_MEM_SWAP_WRITE_CHART, ""); + write_chart_dimension(swap_publish_aggregated[NETDATA_KEY_SWAP_WRITEPAGE_CALL].name, (long long) values->write); + ebpf_write_end_chart(); +} + +/** + * 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_swap_charts(int update_every) +{ + ebpf_create_charts_on_systemd(NETDATA_MEM_SWAP_READ_CHART, + "Calls to swap_readpage.", + EBPF_COMMON_DIMENSION_CALL, NETDATA_SYSTEM_CGROUP_SWAP_SUBMENU, + NETDATA_EBPF_CHART_TYPE_STACKED, 20191, + ebpf_algorithms[NETDATA_EBPF_INCREMENTAL_IDX], NETDATA_SYSTEMD_SWAP_READ_CONTEXT, + NETDATA_EBPF_MODULE_NAME_SWAP, update_every); + + ebpf_create_charts_on_systemd(NETDATA_MEM_SWAP_WRITE_CHART, + "Calls to function swap_writepage.", + EBPF_COMMON_DIMENSION_CALL, NETDATA_SYSTEM_CGROUP_SWAP_SUBMENU, + NETDATA_EBPF_CHART_TYPE_STACKED, 20192, + ebpf_algorithms[NETDATA_EBPF_INCREMENTAL_IDX], NETDATA_SYSTEMD_SWAP_WRITE_CONTEXT, + NETDATA_EBPF_MODULE_NAME_SWAP, update_every); +} + +/** + * Send data to Netdata calling auxiliary functions. + * + * @param update_every value to overwrite the update frequency set by the server. +*/ +void ebpf_swap_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_swap_sum_cgroup_pids(&ect->publish_systemd_swap, ect->pids); + } + + int has_systemd = shm_ebpf_cgroup.header->systemd_enabled; + + if (has_systemd) { + if (send_cgroup_chart) { + ebpf_create_systemd_swap_charts(update_every); + fflush(stdout); + } + ebpf_send_systemd_swap_charts(); + } + + for (ect = ebpf_cgroup_pids; ect ; ect = ect->next) { + if (ect->systemd) + continue; + + if (!(ect->flags & NETDATA_EBPF_CGROUP_HAS_SWAP_CHART) && ect->updated) { + ebpf_create_specific_swap_charts(ect->name, update_every); + ect->flags |= NETDATA_EBPF_CGROUP_HAS_SWAP_CHART; + } + + if (ect->flags & NETDATA_EBPF_CGROUP_HAS_SWAP_CHART) { + if (ect->updated) { + ebpf_send_specific_swap_data(ect->name, &ect->publish_systemd_swap); + } else { + ebpf_obsolete_specific_swap_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 swap_collector(ebpf_module_t *em) +{ + int cgroup = em->cgroup_charts; + int update_every = em->update_every; + heartbeat_t hb; + heartbeat_init(&hb); + int counter = update_every - 1; + int maps_per_core = em->maps_per_core; + uint32_t running_time = 0; + uint32_t lifetime = em->lifetime; + netdata_idx_t *stats = em->hash_table_stats; + memset(stats, 0, sizeof(em->hash_table_stats)); + while (!ebpf_plugin_exit && running_time < lifetime) { + (void)heartbeat_next(&hb, USEC_PER_SEC); + if (ebpf_plugin_exit || ++counter != update_every) + continue; + + counter = 0; + netdata_apps_integration_flags_t apps = em->apps_charts; + ebpf_swap_read_global_table(stats, maps_per_core); + pthread_mutex_lock(&collect_data_mutex); + if (apps) + read_swap_apps_table(maps_per_core); + + if (cgroup) + ebpf_update_swap_cgroup(maps_per_core); + + pthread_mutex_lock(&lock); + + swap_send_global(); + + if (apps & NETDATA_EBPF_APPS_FLAG_CHART_CREATED) + ebpf_swap_send_apps_data(apps_groups_root_target); + + if (cgroup) + ebpf_swap_send_cgroup_data(update_every); + + pthread_mutex_unlock(&lock); + pthread_mutex_unlock(&collect_data_mutex); + + 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); + } +} + +/***************************************************************** + * + * 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_swap_create_apps_charts(struct ebpf_module *em, void *ptr) +{ + struct ebpf_target *root = ptr; + struct ebpf_target *w; + int update_every = em->update_every; + for (w = root; w; w = w->next) { + if (unlikely(!w->exposed)) + continue; + + ebpf_write_chart_cmd(NETDATA_APP_FAMILY, + w->clean_name, + "_ebpf_call_swap_readpage", + "Calls to function swap_readpage.", + EBPF_COMMON_DIMENSION_CALL, + NETDATA_EBPF_MEMORY_GROUP, + NETDATA_EBPF_CHART_TYPE_STACKED, + "app.ebpf_call_swap_readpage", + 20070, + update_every, + NETDATA_EBPF_MODULE_NAME_SWAP); + ebpf_create_chart_labels("app_group", w->name, 1); + ebpf_commit_label(); + fprintf(stdout, "DIMENSION calls '' %s 1 1\n", ebpf_algorithms[NETDATA_EBPF_INCREMENTAL_IDX]); + + ebpf_write_chart_cmd(NETDATA_APP_FAMILY, + w->clean_name, + "_ebpf_call_swap_writepage", + "Calls to function swap_writepage.", + EBPF_COMMON_DIMENSION_CALL, + NETDATA_EBPF_MEMORY_GROUP, + NETDATA_EBPF_CHART_TYPE_STACKED, + "app.ebpf_call_swap_writepage", + 20071, + update_every, + NETDATA_EBPF_MODULE_NAME_SWAP); + ebpf_create_chart_labels("app_group", w->name, 1); + ebpf_commit_label(); + fprintf(stdout, "DIMENSION calls '' %s 1 1\n", ebpf_algorithms[NETDATA_EBPF_INCREMENTAL_IDX]); + + w->charts_created |= 1<<EBPF_MODULE_SWAP_IDX; + } + 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_swap_allocate_global_vectors(int apps) +{ + if (apps) + swap_pid = callocz((size_t)pid_max, sizeof(netdata_publish_swap_t *)); + + swap_vector = callocz((size_t)ebpf_nprocs, sizeof(netdata_publish_swap_t)); + + swap_values = callocz((size_t)ebpf_nprocs, sizeof(netdata_idx_t)); + + memset(swap_hash_values, 0, sizeof(swap_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_swap_charts(int update_every) +{ + ebpf_create_chart(NETDATA_EBPF_MEMORY_GROUP, NETDATA_MEM_SWAP_CHART, + "Calls to access swap memory", + EBPF_COMMON_DIMENSION_CALL, NETDATA_SYSTEM_SWAP_SUBMENU, + NULL, + NETDATA_EBPF_CHART_TYPE_LINE, + NETDATA_CHART_PRIO_MEM_SWAP_CALLS, + ebpf_create_global_dimension, + swap_publish_aggregated, NETDATA_SWAP_END, + update_every, NETDATA_EBPF_MODULE_NAME_SWAP); + + fflush(stdout); +} + +/* + * Load BPF + * + * Load BPF files. + * + * @param em the structure with configuration + */ +static int ebpf_swap_load_bpf(ebpf_module_t *em) +{ +#ifdef LIBBPF_MAJOR_VERSION + ebpf_define_map_type(em->maps, em->maps_per_core, running_on_kernel); +#endif + + int ret = 0; + ebpf_adjust_apps_cgroup(em, em->targets[NETDATA_KEY_SWAP_READPAGE_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) { + ret = -1; + } + } +#ifdef LIBBPF_MAJOR_VERSION + else { + bpf_obj = swap_bpf__open(); + if (!bpf_obj) + ret = -1; + else + ret = ebpf_swap_load_and_attach(bpf_obj, em); + } +#endif + + if (ret) + netdata_log_error("%s %s", EBPF_DEFAULT_ERROR_MSG, em->info.thread_name); + + return ret; +} + +/** + * SWAP thread + * + * Thread used to make swap thread + * + * @param ptr a pointer to `struct ebpf_module` + * + * @return It always return NULL + */ +void *ebpf_swap_thread(void *ptr) +{ + netdata_thread_cleanup_push(ebpf_swap_exit, ptr); + + ebpf_module_t *em = (ebpf_module_t *)ptr; + em->maps = swap_maps; + + ebpf_update_pid_table(&swap_maps[NETDATA_PID_SWAP_TABLE], em); + +#ifdef LIBBPF_MAJOR_VERSION + ebpf_adjust_thread_load(em, default_btf); +#endif + if (ebpf_swap_load_bpf(em)) { + goto endswap; + } + + ebpf_swap_allocate_global_vectors(em->apps_charts); + + int algorithms[NETDATA_SWAP_END] = { NETDATA_EBPF_INCREMENTAL_IDX, NETDATA_EBPF_INCREMENTAL_IDX }; + ebpf_global_labels(swap_aggregated_data, swap_publish_aggregated, swap_dimension_name, swap_dimension_name, + algorithms, NETDATA_SWAP_END); + + pthread_mutex_lock(&lock); + ebpf_create_swap_charts(em->update_every); + ebpf_update_stats(&plugin_statistics, em); + ebpf_update_kernel_memory_with_vector(&plugin_statistics, em->maps, EBPF_ACTION_STAT_ADD); + pthread_mutex_unlock(&lock); + + swap_collector(em); + +endswap: + ebpf_update_disabled_plugin_stats(em); + + netdata_thread_cleanup_pop(1); + return NULL; +} |