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ebpf_fd.c
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ebpf_fd.c
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// SPDX-License-Identifier: GPL-3.0-or-later
#include "ebpf.h"
#include "ebpf_fd.h"
static char *fd_dimension_names[NETDATA_FD_SYSCALL_END] = { "open", "close" };
static char *fd_id_names[NETDATA_FD_SYSCALL_END] = { "do_sys_open", "__close_fd" };
static char *close_targets[NETDATA_EBPF_MAX_FD_TARGETS] = {"close_fd", "__close_fd"};
static char *open_targets[NETDATA_EBPF_MAX_FD_TARGETS] = {"do_sys_openat2", "do_sys_open"};
static netdata_syscall_stat_t fd_aggregated_data[NETDATA_FD_SYSCALL_END];
static netdata_publish_syscall_t fd_publish_aggregated[NETDATA_FD_SYSCALL_END];
static ebpf_local_maps_t fd_maps[] = {{.name = "tbl_fd_pid", .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 = "tbl_fd_global", .internal_input = NETDATA_KEY_END_VECTOR,
.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 = "fd_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 = NULL, .internal_input = 0, .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
}};
struct config fd_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 netdata_idx_t fd_hash_values[NETDATA_FD_COUNTER];
static netdata_idx_t *fd_values = NULL;
netdata_fd_stat_t *fd_vector = NULL;
netdata_ebpf_targets_t fd_targets[] = { {.name = "open", .mode = EBPF_LOAD_TRAMPOLINE},
{.name = "close", .mode = EBPF_LOAD_TRAMPOLINE},
{.name = NULL, .mode = EBPF_LOAD_TRAMPOLINE}};
#ifdef NETDATA_DEV_MODE
int fd_disable_priority;
#endif
#ifdef LIBBPF_MAJOR_VERSION
/**
* Disable probe
*
* Disable all probes to use exclusively another method.
*
* @param obj is the main structure for bpf objects
*/
static inline void ebpf_fd_disable_probes(struct fd_bpf *obj)
{
bpf_program__set_autoload(obj->progs.netdata_sys_open_kprobe, false);
bpf_program__set_autoload(obj->progs.netdata_sys_open_kretprobe, false);
bpf_program__set_autoload(obj->progs.netdata_release_task_fd_kprobe, false);
if (!strcmp(fd_targets[NETDATA_FD_SYSCALL_CLOSE].name, close_targets[NETDATA_FD_CLOSE_FD])) {
bpf_program__set_autoload(obj->progs.netdata___close_fd_kretprobe, false);
bpf_program__set_autoload(obj->progs.netdata___close_fd_kprobe, false);
bpf_program__set_autoload(obj->progs.netdata_close_fd_kprobe, false);
} else {
bpf_program__set_autoload(obj->progs.netdata___close_fd_kprobe, false);
bpf_program__set_autoload(obj->progs.netdata_close_fd_kretprobe, false);
bpf_program__set_autoload(obj->progs.netdata_close_fd_kprobe, false);
}
}
/*
* Disable specific probe
*
* Disable probes according the kernel version
*
* @param obj is the main structure for bpf objects
*/
static inline void ebpf_disable_specific_probes(struct fd_bpf *obj)
{
if (!strcmp(fd_targets[NETDATA_FD_SYSCALL_CLOSE].name, close_targets[NETDATA_FD_CLOSE_FD])) {
bpf_program__set_autoload(obj->progs.netdata___close_fd_kretprobe, false);
bpf_program__set_autoload(obj->progs.netdata___close_fd_kprobe, false);
} else {
bpf_program__set_autoload(obj->progs.netdata_close_fd_kretprobe, false);
bpf_program__set_autoload(obj->progs.netdata_close_fd_kprobe, false);
}
}
/*
* Disable trampoline
*
* Disable all trampoline to use exclusively another method.
*
* @param obj is the main structure for bpf objects.
*/
static inline void ebpf_disable_trampoline(struct fd_bpf *obj)
{
bpf_program__set_autoload(obj->progs.netdata_sys_open_fentry, false);
bpf_program__set_autoload(obj->progs.netdata_sys_open_fexit, false);
bpf_program__set_autoload(obj->progs.netdata_close_fd_fentry, false);
bpf_program__set_autoload(obj->progs.netdata_close_fd_fexit, false);
bpf_program__set_autoload(obj->progs.netdata___close_fd_fentry, false);
bpf_program__set_autoload(obj->progs.netdata___close_fd_fexit, false);
bpf_program__set_autoload(obj->progs.netdata_release_task_fd_fentry, false);
}
/*
* Disable specific trampoline
*
* Disable trampoline according to kernel version.
*
* @param obj is the main structure for bpf objects.
*/
static inline void ebpf_disable_specific_trampoline(struct fd_bpf *obj)
{
if (!strcmp(fd_targets[NETDATA_FD_SYSCALL_CLOSE].name, close_targets[NETDATA_FD_CLOSE_FD])) {
bpf_program__set_autoload(obj->progs.netdata___close_fd_fentry, false);
bpf_program__set_autoload(obj->progs.netdata___close_fd_fexit, false);
} else {
bpf_program__set_autoload(obj->progs.netdata_close_fd_fentry, false);
bpf_program__set_autoload(obj->progs.netdata_close_fd_fexit, 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 fd_bpf *obj)
{
bpf_program__set_attach_target(obj->progs.netdata_sys_open_fentry, 0, fd_targets[NETDATA_FD_SYSCALL_OPEN].name);
bpf_program__set_attach_target(obj->progs.netdata_sys_open_fexit, 0, fd_targets[NETDATA_FD_SYSCALL_OPEN].name);
bpf_program__set_attach_target(obj->progs.netdata_release_task_fd_fentry, 0, EBPF_COMMON_FNCT_CLEAN_UP);
if (!strcmp(fd_targets[NETDATA_FD_SYSCALL_CLOSE].name, close_targets[NETDATA_FD_CLOSE_FD])) {
bpf_program__set_attach_target(
obj->progs.netdata_close_fd_fentry, 0, fd_targets[NETDATA_FD_SYSCALL_CLOSE].name);
bpf_program__set_attach_target(obj->progs.netdata_close_fd_fexit, 0, fd_targets[NETDATA_FD_SYSCALL_CLOSE].name);
} else {
bpf_program__set_attach_target(
obj->progs.netdata___close_fd_fentry, 0, fd_targets[NETDATA_FD_SYSCALL_CLOSE].name);
bpf_program__set_attach_target(
obj->progs.netdata___close_fd_fexit, 0, fd_targets[NETDATA_FD_SYSCALL_CLOSE].name);
}
}
/**
* 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_fd_attach_probe(struct fd_bpf *obj)
{
obj->links.netdata_sys_open_kprobe = bpf_program__attach_kprobe(obj->progs.netdata_sys_open_kprobe, false,
fd_targets[NETDATA_FD_SYSCALL_OPEN].name);
int ret = libbpf_get_error(obj->links.netdata_sys_open_kprobe);
if (ret)
return -1;
obj->links.netdata_sys_open_kretprobe = bpf_program__attach_kprobe(obj->progs.netdata_sys_open_kretprobe, true,
fd_targets[NETDATA_FD_SYSCALL_OPEN].name);
ret = libbpf_get_error(obj->links.netdata_sys_open_kretprobe);
if (ret)
return -1;
obj->links.netdata_release_task_fd_kprobe = bpf_program__attach_kprobe(obj->progs.netdata_release_task_fd_kprobe,
false,
EBPF_COMMON_FNCT_CLEAN_UP);
ret = libbpf_get_error(obj->links.netdata_release_task_fd_kprobe);
if (ret)
return -1;
if (!strcmp(fd_targets[NETDATA_FD_SYSCALL_CLOSE].name, close_targets[NETDATA_FD_CLOSE_FD])) {
obj->links.netdata_close_fd_kretprobe = bpf_program__attach_kprobe(obj->progs.netdata_close_fd_kretprobe, true,
fd_targets[NETDATA_FD_SYSCALL_CLOSE].name);
ret = libbpf_get_error(obj->links.netdata_close_fd_kretprobe);
if (ret)
return -1;
obj->links.netdata_close_fd_kprobe = bpf_program__attach_kprobe(obj->progs.netdata_close_fd_kprobe, false,
fd_targets[NETDATA_FD_SYSCALL_CLOSE].name);
ret = libbpf_get_error(obj->links.netdata_close_fd_kprobe);
if (ret)
return -1;
} else {
obj->links.netdata___close_fd_kretprobe = bpf_program__attach_kprobe(obj->progs.netdata___close_fd_kretprobe,
true,
fd_targets[NETDATA_FD_SYSCALL_CLOSE].name);
ret = libbpf_get_error(obj->links.netdata___close_fd_kretprobe);
if (ret)
return -1;
obj->links.netdata___close_fd_kprobe = bpf_program__attach_kprobe(obj->progs.netdata___close_fd_kprobe,
false,
fd_targets[NETDATA_FD_SYSCALL_CLOSE].name);
ret = libbpf_get_error(obj->links.netdata___close_fd_kprobe);
if (ret)
return -1;
}
return 0;
}
/**
* FD Fill Address
*
* Fill address value used to load probes/trampoline.
*/
static inline void ebpf_fd_fill_address(ebpf_addresses_t *address, char **targets)
{
int i;
for (i = 0; i < NETDATA_EBPF_MAX_FD_TARGETS; i++) {
address->function = targets[i];
ebpf_load_addresses(address, -1);
if (address->addr)
break;
}
}
/**
* Set target values
*
* Set pointers used to load data.
*
* @return It returns 0 on success and -1 otherwise.
*/
static int ebpf_fd_set_target_values()
{
ebpf_addresses_t address = {.function = NULL, .hash = 0, .addr = 0};
ebpf_fd_fill_address(&address, close_targets);
if (!address.addr)
return -1;
fd_targets[NETDATA_FD_SYSCALL_CLOSE].name = address.function;
address.addr = 0;
ebpf_fd_fill_address(&address, open_targets);
if (!address.addr)
return -1;
fd_targets[NETDATA_FD_SYSCALL_OPEN].name = address.function;
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_fd_set_hash_tables(struct fd_bpf *obj)
{
fd_maps[NETDATA_FD_GLOBAL_STATS].map_fd = bpf_map__fd(obj->maps.tbl_fd_global);
fd_maps[NETDATA_FD_PID_STATS].map_fd = bpf_map__fd(obj->maps.tbl_fd_pid);
fd_maps[NETDATA_FD_CONTROLLER].map_fd = bpf_map__fd(obj->maps.fd_ctrl);
}
/**
* 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_fd_adjust_map(struct fd_bpf *obj, ebpf_module_t *em)
{
ebpf_update_map_size(obj->maps.tbl_fd_pid, &fd_maps[NETDATA_FD_PID_STATS],
em, bpf_map__name(obj->maps.tbl_fd_pid));
ebpf_update_map_type(obj->maps.tbl_fd_global, &fd_maps[NETDATA_FD_GLOBAL_STATS]);
ebpf_update_map_type(obj->maps.tbl_fd_pid, &fd_maps[NETDATA_FD_PID_STATS]);
ebpf_update_map_type(obj->maps.fd_ctrl, &fd_maps[NETDATA_FD_CONTROLLER]);
}
/**
* Disable Release Task
*
* Disable release task when apps is not enabled.
*
* @param obj is the main structure for bpf objects.
*/
static void ebpf_fd_disable_release_task(struct fd_bpf *obj)
{
bpf_program__set_autoload(obj->progs.netdata_release_task_fd_kprobe, false);
bpf_program__set_autoload(obj->progs.netdata_release_task_fd_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_fd_load_and_attach(struct fd_bpf *obj, ebpf_module_t *em)
{
netdata_ebpf_targets_t *mt = em->targets;
netdata_ebpf_program_loaded_t test = mt[NETDATA_FD_SYSCALL_OPEN].mode;
if (ebpf_fd_set_target_values()) {
netdata_log_error("%s file descriptor.", NETDATA_EBPF_DEFAULT_FNT_NOT_FOUND);
return -1;
}
if (test == EBPF_LOAD_TRAMPOLINE) {
ebpf_fd_disable_probes(obj);
ebpf_disable_specific_trampoline(obj);
ebpf_set_trampoline_target(obj);
// TODO: Remove this in next PR, because this specific trampoline has an error.
bpf_program__set_autoload(obj->progs.netdata_release_task_fd_fentry, false);
} else {
ebpf_disable_trampoline(obj);
ebpf_disable_specific_probes(obj);
}
ebpf_fd_adjust_map(obj, em);
if (!em->apps_charts && !em->cgroup_charts)
ebpf_fd_disable_release_task(obj);
int ret = fd_bpf__load(obj);
if (ret) {
return ret;
}
ret = (test == EBPF_LOAD_TRAMPOLINE) ? fd_bpf__attach(obj) : ebpf_fd_attach_probe(obj);
if (!ret) {
ebpf_fd_set_hash_tables(obj);
ebpf_update_controller(fd_maps[NETDATA_FD_CONTROLLER].map_fd, em);
}
return ret;
}
#endif
/*****************************************************************
*
* FUNCTIONS TO CLOSE THE THREAD
*
*****************************************************************/
static void ebpf_obsolete_specific_fd_charts(char *type, ebpf_module_t *em);
/**
* Obsolete services
*
* Obsolete all service charts created
*
* @param em a pointer to `struct ebpf_module`
*/
static void ebpf_obsolete_fd_services(ebpf_module_t *em)
{
ebpf_write_chart_obsolete(NETDATA_SERVICE_FAMILY,
NETDATA_SYSCALL_APPS_FILE_OPEN,
"",
"Number of open files",
EBPF_COMMON_DIMENSION_CALL,
NETDATA_APPS_FILE_CGROUP_GROUP,
NETDATA_EBPF_CHART_TYPE_STACKED,
NETDATA_CGROUP_FD_OPEN_CONTEXT,
20270,
em->update_every);
if (em->mode < MODE_ENTRY) {
ebpf_write_chart_obsolete(NETDATA_SERVICE_FAMILY,
NETDATA_SYSCALL_APPS_FILE_OPEN_ERROR,
"",
"Fails to open files",
EBPF_COMMON_DIMENSION_CALL,
NETDATA_APPS_FILE_CGROUP_GROUP,
NETDATA_EBPF_CHART_TYPE_STACKED,
NETDATA_CGROUP_FD_OPEN_ERR_CONTEXT,
20271,
em->update_every);
}
ebpf_write_chart_obsolete(NETDATA_SERVICE_FAMILY,
NETDATA_SYSCALL_APPS_FILE_CLOSED,
"",
"Files closed",
EBPF_COMMON_DIMENSION_CALL,
NETDATA_APPS_FILE_CGROUP_GROUP,
NETDATA_EBPF_CHART_TYPE_STACKED,
NETDATA_CGROUP_FD_CLOSE_CONTEXT,
20272,
em->update_every);
if (em->mode < MODE_ENTRY) {
ebpf_write_chart_obsolete(NETDATA_SERVICE_FAMILY,
NETDATA_SYSCALL_APPS_FILE_CLOSE_ERROR,
"",
"Fails to close files",
EBPF_COMMON_DIMENSION_CALL,
NETDATA_APPS_FILE_CGROUP_GROUP,
NETDATA_EBPF_CHART_TYPE_STACKED,
NETDATA_CGROUP_FD_CLOSE_ERR_CONTEXT,
20273,
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_fd_cgroup_charts(ebpf_module_t *em) {
pthread_mutex_lock(&mutex_cgroup_shm);
ebpf_obsolete_fd_services(em);
ebpf_cgroup_target_t *ect;
for (ect = ebpf_cgroup_pids; ect ; ect = ect->next) {
if (ect->systemd)
continue;
ebpf_obsolete_specific_fd_charts(ect->name, em);
}
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_fd_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_FD_IDX))))
continue;
ebpf_write_chart_obsolete(NETDATA_APP_FAMILY,
w->clean_name,
"_ebpf_file_open",
"Number of open files",
EBPF_COMMON_DIMENSION_CALL,
NETDATA_APPS_FILE_FDS,
NETDATA_EBPF_CHART_TYPE_STACKED,
"app.ebpf_file_open",
20220,
update_every);
if (em->mode < MODE_ENTRY) {
ebpf_write_chart_obsolete(NETDATA_APP_FAMILY,
w->clean_name,
"_ebpf_file_open_error",
"Fails to open files.",
EBPF_COMMON_DIMENSION_CALL,
NETDATA_APPS_FILE_FDS,
NETDATA_EBPF_CHART_TYPE_STACKED,
"app.ebpf_file_open_error",
20221,
update_every);
}
ebpf_write_chart_obsolete(NETDATA_APPS_FAMILY,
w->clean_name,
"_ebpf_file_closed",
"Files closed.",
EBPF_COMMON_DIMENSION_CALL,
NETDATA_APPS_FILE_FDS,
NETDATA_EBPF_CHART_TYPE_STACKED,
"app.ebpf_file_closed",
20222,
update_every);
if (em->mode < MODE_ENTRY) {
ebpf_write_chart_obsolete(NETDATA_APPS_FAMILY,
w->clean_name,
"_ebpf_file_close_error",
"Fails to close files.",
EBPF_COMMON_DIMENSION_CALL,
NETDATA_APPS_FILE_FDS,
NETDATA_EBPF_CHART_TYPE_STACKED,
"app.ebpf_fd_close_error",
20223,
update_every);
}
w->charts_created &= ~(1<<EBPF_MODULE_FD_IDX);
}
}
/**
* Obsolete global
*
* Obsolete global charts created by thread.
*
* @param em a pointer to `struct ebpf_module`
*/
static void ebpf_obsolete_fd_global(ebpf_module_t *em)
{
ebpf_write_chart_obsolete(NETDATA_FILESYSTEM_FAMILY,
NETDATA_FILE_OPEN_CLOSE_COUNT,
"",
"Open and close calls",
EBPF_COMMON_DIMENSION_CALL,
NETDATA_FILE_GROUP,
NETDATA_EBPF_CHART_TYPE_LINE,
NULL,
NETDATA_CHART_PRIO_EBPF_FD_CHARTS,
em->update_every);
if (em->mode < MODE_ENTRY) {
ebpf_write_chart_obsolete(NETDATA_FILESYSTEM_FAMILY,
NETDATA_FILE_OPEN_ERR_COUNT,
"",
"Open fails",
EBPF_COMMON_DIMENSION_CALL,
NETDATA_FILE_GROUP,
NETDATA_EBPF_CHART_TYPE_LINE,
NULL,
NETDATA_CHART_PRIO_EBPF_FD_CHARTS + 1,
em->update_every);
}
}
/**
* FD Exit
*
* Cancel child thread and exit.
*
* @param ptr thread data.
*/
static void ebpf_fd_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_fd_cgroup_charts(em);
fflush(stdout);
}
if (em->apps_charts & NETDATA_EBPF_APPS_FLAG_CHART_CREATED) {
ebpf_obsolete_fd_apps_charts(em);
}
ebpf_obsolete_fd_global(em);
#ifdef NETDATA_DEV_MODE
if (ebpf_aral_fd_pid)
ebpf_statistic_obsolete_aral_chart(em, fd_disable_priority);
#endif
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 (fd_bpf_obj) {
fd_bpf__destroy(fd_bpf_obj);
fd_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);
}
/*****************************************************************
*
* MAIN LOOP
*
*****************************************************************/
/**
* Send data to Netdata calling auxiliary functions.
*
* @param em the structure with thread information
*/
static void ebpf_fd_send_data(ebpf_module_t *em)
{
fd_publish_aggregated[NETDATA_FD_SYSCALL_OPEN].ncall = fd_hash_values[NETDATA_KEY_CALLS_DO_SYS_OPEN];
fd_publish_aggregated[NETDATA_FD_SYSCALL_OPEN].nerr = fd_hash_values[NETDATA_KEY_ERROR_DO_SYS_OPEN];
fd_publish_aggregated[NETDATA_FD_SYSCALL_CLOSE].ncall = fd_hash_values[NETDATA_KEY_CALLS_CLOSE_FD];
fd_publish_aggregated[NETDATA_FD_SYSCALL_CLOSE].nerr = fd_hash_values[NETDATA_KEY_ERROR_CLOSE_FD];
write_count_chart(NETDATA_FILE_OPEN_CLOSE_COUNT, NETDATA_FILESYSTEM_FAMILY, fd_publish_aggregated,
NETDATA_FD_SYSCALL_END);
if (em->mode < MODE_ENTRY) {
write_err_chart(NETDATA_FILE_OPEN_ERR_COUNT, NETDATA_FILESYSTEM_FAMILY,
fd_publish_aggregated, NETDATA_FD_SYSCALL_END);
}
}
/**
* Read global counter
*
* Read the table with number of calls for 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_fd_read_global_tables(netdata_idx_t *stats, int maps_per_core)
{
ebpf_read_global_table_stats(fd_hash_values,
fd_values,
fd_maps[NETDATA_FD_GLOBAL_STATS].map_fd,
maps_per_core,
NETDATA_KEY_CALLS_DO_SYS_OPEN,
NETDATA_FD_COUNTER);
ebpf_read_global_table_stats(stats,
fd_values,
fd_maps[NETDATA_FD_CONTROLLER].map_fd,
maps_per_core,
NETDATA_CONTROLLER_PID_TABLE_ADD,
NETDATA_CONTROLLER_END);
}
/**
* 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 fd_apps_accumulator(netdata_fd_stat_t *out, int maps_per_core)
{
int i, end = (maps_per_core) ? ebpf_nprocs : 1;
netdata_fd_stat_t *total = &out[0];
for (i = 1; i < end; i++) {
netdata_fd_stat_t *w = &out[i];
total->open_call += w->open_call;
total->close_call += w->close_call;
total->open_err += w->open_err;
total->close_err += w->close_err;
}
}
/**
* Fill PID
*
* Fill PID structures
*
* @param current_pid pid that we are collecting data
* @param out values read from hash tables;
*/
static void fd_fill_pid(uint32_t current_pid, netdata_fd_stat_t *publish)
{
netdata_fd_stat_t *curr = fd_pid[current_pid];
if (!curr) {
curr = ebpf_fd_stat_get();
fd_pid[current_pid] = curr;
}
memcpy(curr, &publish[0], sizeof(netdata_fd_stat_t));
}
/**
* 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_fd_apps_table(int maps_per_core)
{
netdata_fd_stat_t *fv = fd_vector;
uint32_t key;
struct ebpf_pid_stat *pids = ebpf_root_of_pids;
int fd = fd_maps[NETDATA_FD_PID_STATS].map_fd;
size_t length = sizeof(netdata_fd_stat_t);
if (maps_per_core)
length *= ebpf_nprocs;
while (pids) {
key = pids->pid;
if (bpf_map_lookup_elem(fd, &key, fv)) {
pids = pids->next;
continue;
}
fd_apps_accumulator(fv, maps_per_core);
fd_fill_pid(key, fv);
// We are cleaning to avoid passing data read from one process to other.
memset(fv, 0, length);
pids = pids->next;
}
}
/**
* Update cgroup
*
* Update cgroup data collected per PID.
*
* @param maps_per_core do I need to read all cores?
*/
static void ebpf_update_fd_cgroup(int maps_per_core)
{
ebpf_cgroup_target_t *ect ;
netdata_fd_stat_t *fv = fd_vector;
int fd = fd_maps[NETDATA_FD_PID_STATS].map_fd;
size_t length = sizeof(netdata_fd_stat_t) * 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_fd_stat_t *out = &pids->fd;
if (likely(fd_pid) && fd_pid[pid]) {
netdata_fd_stat_t *in = fd_pid[pid];
memcpy(out, in, sizeof(netdata_fd_stat_t));
} else {
memset(fv, 0, length);
if (!bpf_map_lookup_elem(fd, &pid, fv)) {
fd_apps_accumulator(fv, maps_per_core);
memcpy(out, fv, sizeof(netdata_fd_stat_t));
}
}
}
}
pthread_mutex_unlock(&mutex_cgroup_shm);
}
/**
* Sum PIDs
*
* Sum values for all targets.
*
* @param fd the output
* @param root list of pids
*/
static void ebpf_fd_sum_pids(netdata_fd_stat_t *fd, struct ebpf_pid_on_target *root)
{
uint32_t open_call = 0;
uint32_t close_call = 0;
uint32_t open_err = 0;
uint32_t close_err = 0;
while (root) {
int32_t pid = root->pid;
netdata_fd_stat_t *w = fd_pid[pid];
if (w) {
open_call += w->open_call;
close_call += w->close_call;
open_err += w->open_err;
close_err += w->close_err;
}
root = root->next;
}
// These conditions were added, because we are using incremental algorithm
fd->open_call = (open_call >= fd->open_call) ? open_call : fd->open_call;
fd->close_call = (close_call >= fd->close_call) ? close_call : fd->close_call;
fd->open_err = (open_err >= fd->open_err) ? open_err : fd->open_err;
fd->close_err = (close_err >= fd->close_err) ? close_err : fd->close_err;
}
/**
* Send data to Netdata calling auxiliary functions.
*
* @param em the structure with thread information
* @param root the target list.
*/
void ebpf_fd_send_apps_data(ebpf_module_t *em, struct ebpf_target *root)
{
struct ebpf_target *w;
for (w = root; w; w = w->next) {
if (unlikely(!(w->charts_created & (1<<EBPF_MODULE_FD_IDX))))
continue;
ebpf_fd_sum_pids(&w->fd, w->root_pid);
ebpf_write_begin_chart(NETDATA_APP_FAMILY, w->clean_name, "_ebpf_file_open");
write_chart_dimension("calls", w->fd.open_call);
ebpf_write_end_chart();
if (em->mode < MODE_ENTRY) {
ebpf_write_begin_chart(NETDATA_APP_FAMILY, w->clean_name, "_ebpf_file_open_error");
write_chart_dimension("calls", w->fd.open_err);
ebpf_write_end_chart();
}
ebpf_write_begin_chart(NETDATA_APP_FAMILY, w->clean_name, "_ebpf_file_closed");
write_chart_dimension("calls", w->fd.close_call);
ebpf_write_end_chart();
if (em->mode < MODE_ENTRY) {
ebpf_write_begin_chart(NETDATA_APP_FAMILY, w->clean_name, "_ebpf_file_close_error");
write_chart_dimension("calls", w->fd.close_err);
ebpf_write_end_chart();
}
}
}
/**
* Sum PIDs
*
* Sum values for all targets.
*
* @param fd structure used to store data
* @param pids input data
*/
static void ebpf_fd_sum_cgroup_pids(netdata_fd_stat_t *fd, struct pid_on_target2 *pids)
{
netdata_fd_stat_t accumulator;
memset(&accumulator, 0, sizeof(accumulator));
while (pids) {
netdata_fd_stat_t *w = &pids->fd;
accumulator.open_err += w->open_err;
accumulator.open_call += w->open_call;
accumulator.close_call += w->close_call;
accumulator.close_err += w->close_err;
pids = pids->next;
}
fd->open_call = (accumulator.open_call >= fd->open_call) ? accumulator.open_call : fd->open_call;
fd->open_err = (accumulator.open_err >= fd->open_err) ? accumulator.open_err : fd->open_err;
fd->close_call = (accumulator.close_call >= fd->close_call) ? accumulator.close_call : fd->close_call;
fd->close_err = (accumulator.close_err >= fd->close_err) ? accumulator.close_err : fd->close_err;
}
/**
* Create specific file descriptor charts
*
* Create charts for cgroup/application.
*
* @param type the chart type.
* @param em the main thread structure.
*/
static void ebpf_create_specific_fd_charts(char *type, ebpf_module_t *em)
{
ebpf_create_chart(type, NETDATA_SYSCALL_APPS_FILE_OPEN, "Number of open files",
EBPF_COMMON_DIMENSION_CALL, NETDATA_APPS_FILE_CGROUP_GROUP,
NETDATA_CGROUP_FD_OPEN_CONTEXT, NETDATA_EBPF_CHART_TYPE_LINE,
NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5400,
ebpf_create_global_dimension,
&fd_publish_aggregated[NETDATA_FD_SYSCALL_OPEN],
1, em->update_every, NETDATA_EBPF_MODULE_NAME_FD);
if (em->mode < MODE_ENTRY) {
ebpf_create_chart(type, NETDATA_SYSCALL_APPS_FILE_OPEN_ERROR, "Fails to open files",
EBPF_COMMON_DIMENSION_CALL, NETDATA_APPS_FILE_CGROUP_GROUP,
NETDATA_CGROUP_FD_OPEN_ERR_CONTEXT, NETDATA_EBPF_CHART_TYPE_LINE,
NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5401,
ebpf_create_global_dimension,
&fd_publish_aggregated[NETDATA_FD_SYSCALL_OPEN],
1, em->update_every,
NETDATA_EBPF_MODULE_NAME_FD);
}
ebpf_create_chart(type, NETDATA_SYSCALL_APPS_FILE_CLOSED, "Files closed",
EBPF_COMMON_DIMENSION_CALL, NETDATA_APPS_FILE_CGROUP_GROUP,
NETDATA_CGROUP_FD_CLOSE_CONTEXT, NETDATA_EBPF_CHART_TYPE_LINE,
NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5402,
ebpf_create_global_dimension,
&fd_publish_aggregated[NETDATA_FD_SYSCALL_CLOSE],
1, em->update_every, NETDATA_EBPF_MODULE_NAME_FD);
if (em->mode < MODE_ENTRY) {
ebpf_create_chart(type, NETDATA_SYSCALL_APPS_FILE_CLOSE_ERROR, "Fails to close files",
EBPF_COMMON_DIMENSION_CALL, NETDATA_APPS_FILE_CGROUP_GROUP,
NETDATA_CGROUP_FD_CLOSE_ERR_CONTEXT, NETDATA_EBPF_CHART_TYPE_LINE,
NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5403,
ebpf_create_global_dimension,
&fd_publish_aggregated[NETDATA_FD_SYSCALL_CLOSE],
1, em->update_every,
NETDATA_EBPF_MODULE_NAME_FD);
}
}
/**
* Obsolete specific file descriptor charts
*
* Obsolete charts for cgroup/application.
*
* @param type the chart type.
* @param em the main thread structure.
*/
static void ebpf_obsolete_specific_fd_charts(char *type, ebpf_module_t *em)
{
ebpf_write_chart_obsolete(type, NETDATA_SYSCALL_APPS_FILE_OPEN, "", "Number of open files",
EBPF_COMMON_DIMENSION_CALL, NETDATA_APPS_FILE_GROUP,
NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CGROUP_FD_OPEN_CONTEXT,
NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5400, em->update_every);
if (em->mode < MODE_ENTRY) {
ebpf_write_chart_obsolete(type, NETDATA_SYSCALL_APPS_FILE_OPEN_ERROR, "", "Fails to open files",
EBPF_COMMON_DIMENSION_CALL, NETDATA_APPS_FILE_GROUP,
NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CGROUP_FD_OPEN_ERR_CONTEXT,
NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5401, em->update_every);
}
ebpf_write_chart_obsolete(type, NETDATA_SYSCALL_APPS_FILE_CLOSED, "", "Files closed",
EBPF_COMMON_DIMENSION_CALL, NETDATA_APPS_FILE_GROUP,
NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CGROUP_FD_CLOSE_CONTEXT,
NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5402, em->update_every);
if (em->mode < MODE_ENTRY) {
ebpf_write_chart_obsolete(type, NETDATA_SYSCALL_APPS_FILE_CLOSE_ERROR, "", "Fails to close files",
EBPF_COMMON_DIMENSION_CALL, NETDATA_APPS_FILE_GROUP,
NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CGROUP_FD_CLOSE_ERR_CONTEXT,
NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5403, em->update_every);
}
}
/*
* Send specific file descriptor 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_fd_data(char *type, netdata_fd_stat_t *values, ebpf_module_t *em)
{
ebpf_write_begin_chart(type, NETDATA_SYSCALL_APPS_FILE_OPEN, "");
write_chart_dimension(fd_publish_aggregated[NETDATA_FD_SYSCALL_OPEN].name, (long long)values->open_call);
ebpf_write_end_chart();
if (em->mode < MODE_ENTRY) {
ebpf_write_begin_chart(type, NETDATA_SYSCALL_APPS_FILE_OPEN_ERROR, "");
write_chart_dimension(fd_publish_aggregated[NETDATA_FD_SYSCALL_OPEN].name, (long long)values->open_err);
ebpf_write_end_chart();
}
ebpf_write_begin_chart(type, NETDATA_SYSCALL_APPS_FILE_CLOSED, "");
write_chart_dimension(fd_publish_aggregated[NETDATA_FD_SYSCALL_CLOSE].name, (long long)values->close_call);
ebpf_write_end_chart();
if (em->mode < MODE_ENTRY) {
ebpf_write_begin_chart(type, NETDATA_SYSCALL_APPS_FILE_CLOSE_ERROR, "");
write_chart_dimension(fd_publish_aggregated[NETDATA_FD_SYSCALL_CLOSE].name, (long long)values->close_err);
ebpf_write_end_chart();
}
}
/**
* Create systemd file descriptor charts
*
* Create charts when systemd is enabled
*
* @param em the main collector structure