src/collectors/ebpf.plugin/ebpf_swap.c
// 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 = NULL, .mode = EBPF_LOAD_TRAMPOLINE},
{.name = "swap_writepage", .mode = EBPF_LOAD_TRAMPOLINE},
{.name = NULL, .mode = EBPF_LOAD_TRAMPOLINE}};
static char *swap_read[] ={ "swap_readpage", "swap_read_folio", NULL };
struct netdata_static_thread ebpf_read_swap = {
.name = "EBPF_READ_SWAP",
.config_section = NULL,
.config_name = NULL,
.env_name = NULL,
.enabled = 1,
.thread = NULL,
.init_routine = NULL,
.start_routine = NULL
};
#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_read_folio_probe, false);
bpf_program__set_autoload(obj->progs.netdata_swap_writepage_probe, false);
}
/**
* Disable specific probe
*
* Disable specific probes according to available functions
*
* @param obj is the main structure for bpf objects
*/
static inline void ebpf_swap_disable_specific_probe(struct swap_bpf *obj)
{
if (!strcmp(swap_targets[NETDATA_KEY_SWAP_READPAGE_CALL].name,
swap_read[NETDATA_KEY_SWAP_READPAGE_CALL])) {
bpf_program__set_autoload(obj->progs.netdata_swap_read_folio_probe, false);
} else {
bpf_program__set_autoload(obj->progs.netdata_swap_readpage_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_read_folio_fentry, false);
bpf_program__set_autoload(obj->progs.netdata_swap_writepage_fentry, false);
}
/**
* Disable specific trampoline
*
* Disable specific trampolines according to available functions
*
* @param obj is the main structure for bpf objects
*/
static inline void ebpf_swap_disable_specific_trampoline(struct swap_bpf *obj)
{
if (!strcmp(swap_targets[NETDATA_KEY_SWAP_READPAGE_CALL].name,
swap_read[NETDATA_KEY_SWAP_READPAGE_CALL])) {
bpf_program__set_autoload(obj->progs.netdata_swap_read_folio_fentry, false);
} else {
bpf_program__set_autoload(obj->progs.netdata_swap_readpage_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);
}
/**
* 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)
{
int ret;
if (!strcmp(swap_targets[NETDATA_KEY_SWAP_READPAGE_CALL].name,
swap_read[NETDATA_KEY_SWAP_READPAGE_CALL])) {
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);
ret = libbpf_get_error(obj->links.netdata_swap_readpage_probe);
} else {
obj->links.netdata_swap_read_folio_probe = bpf_program__attach_kprobe(obj->progs.netdata_swap_read_folio_probe,
false,
swap_targets[NETDATA_KEY_SWAP_READPAGE_CALL].name);
ret = libbpf_get_error(obj->links.netdata_swap_read_folio_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]);
}
/**
* 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_disable_specific_trampoline(obj);
ebpf_swap_set_trampoline_target(obj);
} else {
ebpf_swap_disable_trampoline(obj);
ebpf_swap_disable_specific_probe(obj);
}
ebpf_swap_adjust_map(obj, em);
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, char *id)
{
ebpf_write_chart_obsolete(NETDATA_SERVICE_FAMILY,
id,
NETDATA_MEM_SWAP_READ_CHART,
"Calls to function swap_readpage.",
EBPF_COMMON_DIMENSION_CALL,
NETDATA_SYSTEM_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,
id,
NETDATA_MEM_SWAP_WRITE_CHART,
"Calls to function swap_writepage.",
EBPF_COMMON_DIMENSION_CALL,
NETDATA_SYSTEM_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_cgroup_target_t *ect;
for (ect = ebpf_cgroup_pids; ect ; ect = ect->next) {
if (ect->systemd) {
ebpf_obsolete_swap_services(em, ect->name);
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;
pthread_mutex_lock(&collect_data_mutex);
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);
}
pthread_mutex_unlock(&collect_data_mutex);
}
/**
* 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 (ebpf_read_swap.thread)
nd_thread_signal_cancel(ebpf_read_swap.thread);
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;
}
}
/**
* Update cgroup
*
* Update cgroup data based in
*/
static void ebpf_update_swap_cgroup()
{
ebpf_cgroup_target_t *ect ;
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;
ebpf_pid_stat_t *local_pid = ebpf_get_pid_entry(pid, 0);
if (local_pid) {
netdata_publish_swap_t *in = &local_pid->swap;
memcpy(out, in, sizeof(netdata_publish_swap_t));
}
}
}
pthread_mutex_unlock(&mutex_cgroup_shm);
}
/**
* 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;
ebpf_pid_stat_t *local_pid = ebpf_get_pid_entry(pid, 0);
if (local_pid) {
netdata_publish_swap_t *w = &local_pid->swap;
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;
}
/**
* Resume apps data
*/
void ebpf_swap_resume_apps_data() {
struct ebpf_target *w;
for (w = apps_groups_root_target; w; w = w->next) {
if (unlikely(!(w->charts_created & (1 << EBPF_MODULE_SWAP_IDX))))
continue;
ebpf_swap_sum_pids(&w->swap, w->root_pid);
}
}
/**
* 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 ebpf_read_swap_apps_table(int maps_per_core, int max_period)
{
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;
uint32_t key = 0, next_key = 0;
while (bpf_map_get_next_key(fd, &key, &next_key) == 0) {
if (bpf_map_lookup_elem(fd, &key, cv)) {
goto end_swap_loop;
}
swap_apps_accumulator(cv, maps_per_core);
ebpf_pid_stat_t *local_pid = ebpf_get_pid_entry(key, cv->tgid);
if (!local_pid)
goto end_swap_loop;
netdata_publish_swap_t *publish = &local_pid->swap;
if (!publish->ct || publish->ct != cv->ct) {
memcpy(publish, cv, sizeof(netdata_publish_swap_t));
local_pid->not_updated = 0;
} else if (++local_pid->not_updated >= max_period) {
bpf_map_delete_elem(fd, &key);
local_pid->not_updated = 0;
}
// We are cleaning to avoid passing data read from one process to other.
end_swap_loop:
memset(cv, 0, length);
key = next_key;
}
}
/**
* SWAP thread
*
* Thread used to generate swap charts.
*
* @param ptr a pointer to `struct ebpf_module`
*
* @return It always return NULL
*/
void *ebpf_read_swap_thread(void *ptr)
{
heartbeat_t hb;
heartbeat_init(&hb);
ebpf_module_t *em = (ebpf_module_t *)ptr;
int maps_per_core = em->maps_per_core;
int update_every = em->update_every;
int counter = update_every - 1;
uint32_t lifetime = em->lifetime;
uint32_t running_time = 0;
usec_t period = update_every * USEC_PER_SEC;
int max_period = update_every * EBPF_CLEANUP_FACTOR;
while (!ebpf_plugin_stop() && running_time < lifetime) {
(void)heartbeat_next(&hb, period);
if (ebpf_plugin_stop() || ++counter != update_every)
continue;
pthread_mutex_lock(&collect_data_mutex);
ebpf_read_swap_apps_table(maps_per_core, max_period);
ebpf_swap_resume_apps_data();
pthread_mutex_unlock(&collect_data_mutex);
counter = 0;
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);
}
return NULL;
}
/**
* 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);
}
/**
* 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;
pthread_mutex_lock(&collect_data_mutex);
for (w = root; w; w = w->next) {
if (unlikely(!(w->charts_created & (1<<EBPF_MODULE_SWAP_IDX))))
continue;
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();
}
pthread_mutex_unlock(&collect_data_mutex);
}
/**
* 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;
for (ect = ebpf_cgroup_pids; ect ; ect = ect->next) {
if (unlikely(!(ect->flags & NETDATA_EBPF_SERVICES_HAS_SWAP_CHART)) ) {
continue;
}
ebpf_write_begin_chart(NETDATA_SERVICE_FAMILY, ect->name, NETDATA_MEM_SWAP_READ_CHART);
write_chart_dimension("calls", (long long) ect->publish_systemd_swap.read);
ebpf_write_end_chart();
ebpf_write_begin_chart(NETDATA_SERVICE_FAMILY, ect->name, NETDATA_MEM_SWAP_WRITE_CHART);
write_chart_dimension("calls", (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)
{
char *label = (!strncmp(type, "cgroup_", 7)) ? &type[7] : type;
ebpf_create_chart(type, NETDATA_MEM_SWAP_READ_CHART,
"Calls to function swap_readpage.",
EBPF_COMMON_DIMENSION_CALL, NETDATA_SYSTEM_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_labels("cgroup_name", label, RRDLABEL_SRC_AUTO);
ebpf_commit_label();
ebpf_create_chart(type, NETDATA_MEM_SWAP_WRITE_CHART,
"Calls to function swap_writepage.",
EBPF_COMMON_DIMENSION_CALL, NETDATA_SYSTEM_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);
ebpf_create_chart_labels("cgroup_name", label, RRDLABEL_SRC_AUTO);
ebpf_commit_label();
}
/**
* 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_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_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)
{
static ebpf_systemd_args_t data_read = {
.title = "Calls to swap_readpage.",
.units = EBPF_COMMON_DIMENSION_CALL,
.family = NETDATA_SYSTEM_SWAP_SUBMENU,
.charttype = NETDATA_EBPF_CHART_TYPE_STACKED,
.order = 20191,
.algorithm = EBPF_CHART_ALGORITHM_INCREMENTAL,
.context = NETDATA_SYSTEMD_SWAP_READ_CONTEXT,
.module = NETDATA_EBPF_MODULE_NAME_SWAP,
.update_every = 0,
.suffix = NETDATA_MEM_SWAP_READ_CHART,
.dimension = "calls"
};
static ebpf_systemd_args_t data_write = {
.title = "Calls to function swap_writepage.",
.units = EBPF_COMMON_DIMENSION_CALL,
.family = NETDATA_SYSTEM_SWAP_SUBMENU,
.charttype = NETDATA_EBPF_CHART_TYPE_STACKED,
.order = 20192,
.algorithm = EBPF_CHART_ALGORITHM_INCREMENTAL,
.context = NETDATA_SYSTEMD_SWAP_WRITE_CONTEXT,
.module = NETDATA_EBPF_MODULE_NAME_SWAP,
.update_every = 0,
.suffix = NETDATA_MEM_SWAP_WRITE_CHART,
.dimension = "calls"
};
if (!data_write.update_every)
data_read.update_every = data_write.update_every = update_every;
ebpf_cgroup_target_t *w;
for (w = ebpf_cgroup_pids; w ; w = w->next) {
if (unlikely(!w->systemd || w->flags & NETDATA_EBPF_SERVICES_HAS_SWAP_CHART))
continue;
data_read.id = data_write.id = w->name;
ebpf_create_charts_on_systemd(&data_read);
ebpf_create_charts_on_systemd(&data_write);
w->flags |= NETDATA_EBPF_SERVICES_HAS_SWAP_CHART;
}
}
/**
* 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)
{
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);
}
if (shm_ebpf_cgroup.header->systemd_enabled) {
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_stop() && running_time < lifetime) {
(void)heartbeat_next(&hb, USEC_PER_SEC);
if (ebpf_plugin_stop() || ++counter != update_every)
continue;
counter = 0;
netdata_apps_integration_flags_t apps = em->apps_charts;
ebpf_swap_read_global_table(stats, maps_per_core);
if (cgroup && shm_ebpf_cgroup.header)
ebpf_update_swap_cgroup();
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 && shm_ebpf_cgroup.header)
ebpf_swap_send_cgroup_data(update_every);
pthread_mutex_unlock(&lock);
pthread_mutex_lock(&ebpf_exit_cleanup);
if (running_time && !em->running_time)
running_time = update_every;
else
running_time += update_every;
em->running_time = running_time;
pthread_mutex_unlock(&ebpf_exit_cleanup);
}
}
/*****************************************************************
*
* 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, RRDLABEL_SRC_AUTO);
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, RRDLABEL_SRC_AUTO);
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.
*/
static void ebpf_swap_allocate_global_vectors()
{
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;
}
/**
* Update Internal value
*
* Update values used during runtime.
*
* @return It returns 0 when one of the functions is present and -1 otherwise.
*/
static int ebpf_swap_set_internal_value()
{
ebpf_addresses_t address = {.function = NULL, .hash = 0, .addr = 0};
int i;
for (i = 0; swap_read[i] ; i++) {
address.function = swap_read[i];
ebpf_load_addresses(&address, -1);
if (address.addr)
break;
}
if (!address.addr) {
netdata_log_error("%s swap.", NETDATA_EBPF_DEFAULT_FNT_NOT_FOUND);
return -1;
}
swap_targets[NETDATA_KEY_SWAP_READPAGE_CALL].name = address.function;
return 0;
}
/**
* 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)
{
ebpf_module_t *em = (ebpf_module_t *)ptr;
CLEANUP_FUNCTION_REGISTER(ebpf_swap_exit) cleanup_ptr = em;
em->maps = swap_maps;
ebpf_update_pid_table(&swap_maps[NETDATA_PID_SWAP_TABLE], em);
if (ebpf_swap_set_internal_value()) {
goto endswap;
}
#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();
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);
ebpf_read_swap.thread = nd_thread_create(ebpf_read_swap.name, NETDATA_THREAD_OPTION_DEFAULT,
ebpf_read_swap_thread, em);
swap_collector(em);
endswap:
ebpf_update_disabled_plugin_stats(em);
return NULL;
}