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netdata/collectors/ebpf.plugin/ebpf_dcstat.c

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// SPDX-License-Identifier: GPL-3.0-or-later
#include "ebpf.h"
#include "ebpf_dcstat.h"
static char *dcstat_counter_dimension_name[NETDATA_DCSTAT_IDX_END] = { "ratio", "reference", "slow", "miss" };
static netdata_syscall_stat_t dcstat_counter_aggregated_data[NETDATA_DCSTAT_IDX_END];
static netdata_publish_syscall_t dcstat_counter_publish_aggregated[NETDATA_DCSTAT_IDX_END];
netdata_dcstat_pid_t *dcstat_vector = NULL;
netdata_publish_dcstat_t **dcstat_pid = NULL;
static struct bpf_link **probe_links = NULL;
static struct bpf_object *objects = NULL;
static netdata_idx_t dcstat_hash_values[NETDATA_DCSTAT_IDX_END];
static netdata_idx_t *dcstat_values = NULL;
static int read_thread_closed = 1;
struct config dcstat_config = { .first_section = NULL,
.last_section = NULL,
.mutex = NETDATA_MUTEX_INITIALIZER,
.index = { .avl_tree = { .root = NULL, .compar = appconfig_section_compare },
.rwlock = AVL_LOCK_INITIALIZER } };
struct netdata_static_thread dcstat_threads = {"DCSTAT KERNEL",
NULL, NULL, 1, NULL,
NULL, NULL};
static ebpf_local_maps_t dcstat_maps[] = {{.name = "dcstat_global", .internal_input = NETDATA_DIRECTORY_CACHE_END,
.user_input = 0, .type = NETDATA_EBPF_MAP_STATIC,
.map_fd = ND_EBPF_MAP_FD_NOT_INITIALIZED},
{.name = "dcstat_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},
{.name = "dcstat_ctrl", .internal_input = NETDATA_CONTROLLER_END,
.user_input = 0,
.type = NETDATA_EBPF_MAP_CONTROLLER,
.map_fd = ND_EBPF_MAP_FD_NOT_INITIALIZED},
{.name = NULL, .internal_input = 0, .user_input = 0,
.type = NETDATA_EBPF_MAP_CONTROLLER,
.map_fd = ND_EBPF_MAP_FD_NOT_INITIALIZED}};
static ebpf_specify_name_t dc_optional_name[] = { {.program_name = "netdata_lookup_fast",
.function_to_attach = "lookup_fast",
.optional = NULL,
.retprobe = CONFIG_BOOLEAN_NO},
{.program_name = NULL}};
netdata_ebpf_targets_t dc_targets[] = { {.name = "lookup_fast", .mode = EBPF_LOAD_TRAMPOLINE},
{.name = "d_lookup", .mode = EBPF_LOAD_TRAMPOLINE},
{.name = NULL, .mode = EBPF_LOAD_TRAMPOLINE}};
#ifdef LIBBPF_MAJOR_VERSION
#include "includes/dc.skel.h" // BTF code
static struct dc_bpf *bpf_obj = NULL;
/**
* Disable probe
*
* Disable all probes to use exclusively another method.
*
* @param obj is the main structure for bpf objects
*/
static inline void ebpf_dc_disable_probes(struct dc_bpf *obj)
{
bpf_program__set_autoload(obj->progs.netdata_lookup_fast_kprobe, false);
bpf_program__set_autoload(obj->progs.netdata_d_lookup_kretprobe, false);
}
/*
* Disable trampoline
*
* Disable all trampoline to use exclusively another method.
*
* @param obj is the main structure for bpf objects.
*/
static inline void ebpf_dc_disable_trampoline(struct dc_bpf *obj)
{
bpf_program__set_autoload(obj->progs.netdata_lookup_fast_fentry, false);
bpf_program__set_autoload(obj->progs.netdata_d_lookup_fexit, false);
}
/**
* Set trampoline target
*
* Set the targets we will monitor.
*
* @param obj is the main structure for bpf objects.
*/
static void ebpf_dc_set_trampoline_target(struct dc_bpf *obj)
{
bpf_program__set_attach_target(obj->progs.netdata_lookup_fast_fentry, 0,
dc_targets[NETDATA_DC_TARGET_LOOKUP_FAST].name);
bpf_program__set_attach_target(obj->progs.netdata_d_lookup_fexit, 0,
dc_targets[NETDATA_DC_TARGET_D_LOOKUP].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_dc_attach_probes(struct dc_bpf *obj)
{
obj->links.netdata_d_lookup_kretprobe = bpf_program__attach_kprobe(obj->progs.netdata_d_lookup_kretprobe,
true,
dc_targets[NETDATA_DC_TARGET_D_LOOKUP].name);
int ret = libbpf_get_error(obj->links.netdata_d_lookup_kretprobe);
if (ret)
return -1;
char *lookup_name = (dc_optional_name[NETDATA_DC_TARGET_LOOKUP_FAST].optional) ?
dc_optional_name[NETDATA_DC_TARGET_LOOKUP_FAST].optional :
dc_targets[NETDATA_DC_TARGET_LOOKUP_FAST].name ;
obj->links.netdata_lookup_fast_kprobe = bpf_program__attach_kprobe(obj->progs.netdata_lookup_fast_kprobe,
false,
lookup_name);
ret = libbpf_get_error(obj->links.netdata_lookup_fast_kprobe);
if (ret)
return -1;
return 0;
}
/**
* 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_dc_adjust_map_size(struct dc_bpf *obj, ebpf_module_t *em)
{
ebpf_update_map_size(obj->maps.dcstat_pid, &dcstat_maps[NETDATA_DCSTAT_PID_STATS],
em, bpf_map__name(obj->maps.dcstat_pid));
}
/**
* 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_dc_set_hash_tables(struct dc_bpf *obj)
{
dcstat_maps[NETDATA_DCSTAT_GLOBAL_STATS].map_fd = bpf_map__fd(obj->maps.dcstat_global);
dcstat_maps[NETDATA_DCSTAT_PID_STATS].map_fd = bpf_map__fd(obj->maps.dcstat_pid);
dcstat_maps[NETDATA_DCSTAT_CTRL].map_fd = bpf_map__fd(obj->maps.dcstat_ctrl);
}
/**
* Update Load
*
* For directory cache, some distributions change the function name, and we do not have condition to use
* TRAMPOLINE like other functions.
*
* @param em structure with configuration
*
* @return When then symbols were not modified, it returns TRAMPOLINE, else it returns RETPROBE.
*/
netdata_ebpf_program_loaded_t ebpf_dc_update_load(ebpf_module_t *em)
{
if (!strcmp(dc_optional_name[NETDATA_DC_TARGET_LOOKUP_FAST].optional,
dc_optional_name[NETDATA_DC_TARGET_LOOKUP_FAST].function_to_attach))
return EBPF_LOAD_TRAMPOLINE;
if (em->targets[NETDATA_DC_TARGET_LOOKUP_FAST].mode != EBPF_LOAD_RETPROBE)
info("When your kernel was compiled the symbol %s was modified, instead to use `trampoline`, the plugin will use `probes`.",
dc_optional_name[NETDATA_DC_TARGET_LOOKUP_FAST].function_to_attach);
return EBPF_LOAD_RETPROBE;
}
/**
* 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_dc_load_and_attach(struct dc_bpf *obj, ebpf_module_t *em)
{
netdata_ebpf_program_loaded_t test = ebpf_dc_update_load(em);
if (test == EBPF_LOAD_TRAMPOLINE) {
ebpf_dc_disable_probes(obj);
ebpf_dc_set_trampoline_target(obj);
} else {
ebpf_dc_disable_trampoline(obj);
}
int ret = dc_bpf__load(obj);
if (ret) {
return ret;
}
ebpf_dc_adjust_map_size(obj, em);
ret = (test == EBPF_LOAD_TRAMPOLINE) ? dc_bpf__attach(obj) : ebpf_dc_attach_probes(obj);
if (!ret) {
ebpf_dc_set_hash_tables(obj);
ebpf_update_controller(dcstat_maps[NETDATA_DCSTAT_CTRL].map_fd, em);
}
return ret;
}
#endif
/*****************************************************************
*
* COMMON FUNCTIONS
*
*****************************************************************/
/**
* Update publish
*
* Update publish values before to write dimension.
*
* @param out structure that will receive data.
* @param cache_access number of access to directory cache.
* @param not_found number of files not found on the file system
*/
void dcstat_update_publish(netdata_publish_dcstat_t *out, uint64_t cache_access, uint64_t not_found)
{
NETDATA_DOUBLE successful_access = (NETDATA_DOUBLE) (((long long)cache_access) - ((long long)not_found));
NETDATA_DOUBLE ratio = (cache_access) ? successful_access/(NETDATA_DOUBLE)cache_access : 0;
out->ratio = (long long )(ratio*100);
}
/*****************************************************************
*
* FUNCTIONS TO CLOSE THE THREAD
*
*****************************************************************/
/**
* Clean PID structures
*
* Clean the allocated structures.
*/
void clean_dcstat_pid_structures() {
struct pid_stat *pids = root_of_pids;
while (pids) {
freez(dcstat_pid[pids->pid]);
pids = pids->next;
}
}
/**
* Clean names
*
* Clean the optional names allocated during startup.
*/
void ebpf_dcstat_clean_names()
{
size_t i = 0;
while (dc_optional_name[i].program_name) {
freez(dc_optional_name[i].optional);
i++;
}
}
/**
* Clean up the main thread.
*
* @param ptr thread data.
*/
static void ebpf_dcstat_cleanup(void *ptr)
{
ebpf_module_t *em = (ebpf_module_t *)ptr;
if (!em->enabled)
return;
heartbeat_t hb;
heartbeat_init(&hb);
uint32_t tick = 2 * USEC_PER_MS;
while (!read_thread_closed) {
usec_t dt = heartbeat_next(&hb, tick);
UNUSED(dt);
}
freez(dcstat_vector);
freez(dcstat_values);
ebpf_cleanup_publish_syscall(dcstat_counter_publish_aggregated);
ebpf_dcstat_clean_names();
if (probe_links) {
struct bpf_program *prog;
size_t i = 0 ;
bpf_object__for_each_program(prog, objects) {
bpf_link__destroy(probe_links[i]);
i++;
}
bpf_object__close(objects);
}
#ifdef LIBBPF_MAJOR_VERSION
else if (bpf_obj)
dc_bpf__destroy(bpf_obj);
#endif
}
/*****************************************************************
*
* APPS
*
*****************************************************************/
/**
* 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_dcstat_create_apps_charts(struct ebpf_module *em, void *ptr)
{
struct target *root = ptr;
ebpf_create_charts_on_apps(NETDATA_DC_HIT_CHART,
"Percentage of files inside directory cache",
EBPF_COMMON_DIMENSION_PERCENTAGE,
NETDATA_DIRECTORY_CACHE_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE,
20100,
ebpf_algorithms[NETDATA_EBPF_ABSOLUTE_IDX],
root, em->update_every, NETDATA_EBPF_MODULE_NAME_DCSTAT);
ebpf_create_charts_on_apps(NETDATA_DC_REFERENCE_CHART,
"Count file access",
EBPF_COMMON_DIMENSION_FILES,
NETDATA_DIRECTORY_CACHE_SUBMENU,
NETDATA_EBPF_CHART_TYPE_STACKED,
20101,
ebpf_algorithms[NETDATA_EBPF_ABSOLUTE_IDX],
root, em->update_every, NETDATA_EBPF_MODULE_NAME_DCSTAT);
ebpf_create_charts_on_apps(NETDATA_DC_REQUEST_NOT_CACHE_CHART,
"Files not present inside directory cache",
EBPF_COMMON_DIMENSION_FILES,
NETDATA_DIRECTORY_CACHE_SUBMENU,
NETDATA_EBPF_CHART_TYPE_STACKED,
20102,
ebpf_algorithms[NETDATA_EBPF_ABSOLUTE_IDX],
root, em->update_every, NETDATA_EBPF_MODULE_NAME_DCSTAT);
ebpf_create_charts_on_apps(NETDATA_DC_REQUEST_NOT_FOUND_CHART,
"Files not found",
EBPF_COMMON_DIMENSION_FILES,
NETDATA_DIRECTORY_CACHE_SUBMENU,
NETDATA_EBPF_CHART_TYPE_STACKED,
20103,
ebpf_algorithms[NETDATA_EBPF_ABSOLUTE_IDX],
root, em->update_every, NETDATA_EBPF_MODULE_NAME_DCSTAT);
}
/*****************************************************************
*
* MAIN LOOP
*
*****************************************************************/
/**
* Apps Accumulator
*
* Sum all values read from kernel and store in the first address.
*
* @param out the vector with read values.
*/
static void dcstat_apps_accumulator(netdata_dcstat_pid_t *out)
{
int i, end = (running_on_kernel >= NETDATA_KERNEL_V4_15) ? ebpf_nprocs : 1;
netdata_dcstat_pid_t *total = &out[0];
for (i = 1; i < end; i++) {
netdata_dcstat_pid_t *w = &out[i];
total->cache_access += w->cache_access;
total->file_system += w->file_system;
total->not_found += w->not_found;
}
}
/**
* Save PID values
*
* Save the current values inside the structure
*
* @param out vector used to plot charts
* @param publish vector with values read from hash tables.
*/
static inline void dcstat_save_pid_values(netdata_publish_dcstat_t *out, netdata_dcstat_pid_t *publish)
{
memcpy(&out->curr, &publish[0], sizeof(netdata_dcstat_pid_t));
}
/**
* Fill PID
*
* Fill PID structures
*
* @param current_pid pid that we are collecting data
* @param out values read from hash tables;
*/
static void dcstat_fill_pid(uint32_t current_pid, netdata_dcstat_pid_t *publish)
{
netdata_publish_dcstat_t *curr = dcstat_pid[current_pid];
if (!curr) {
curr = callocz(1, sizeof(netdata_publish_dcstat_t));
dcstat_pid[current_pid] = curr;
}
dcstat_save_pid_values(curr, publish);
}
/**
* Read APPS table
*
* Read the apps table and store data inside the structure.
*/
static void read_apps_table()
{
netdata_dcstat_pid_t *cv = dcstat_vector;
uint32_t key;
struct pid_stat *pids = root_of_pids;
int fd = dcstat_maps[NETDATA_DCSTAT_PID_STATS].map_fd;
size_t length = sizeof(netdata_dcstat_pid_t)*ebpf_nprocs;
while (pids) {
key = pids->pid;
if (bpf_map_lookup_elem(fd, &key, cv)) {
pids = pids->next;
continue;
}
dcstat_apps_accumulator(cv);
dcstat_fill_pid(key, cv);
// We are cleaning to avoid passing data read from one process to other.
memset(cv, 0, length);
pids = pids->next;
}
}
/**
* Update cgroup
*
* Update cgroup data based in
*/
static void ebpf_update_dc_cgroup()
{
netdata_dcstat_pid_t *cv = dcstat_vector;
int fd = dcstat_maps[NETDATA_DCSTAT_PID_STATS].map_fd;
size_t length = sizeof(netdata_dcstat_pid_t)*ebpf_nprocs;
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_dcstat_pid_t *out = &pids->dc;
if (likely(dcstat_pid) && dcstat_pid[pid]) {
netdata_publish_dcstat_t *in = dcstat_pid[pid];
memcpy(out, &in->curr, sizeof(netdata_dcstat_pid_t));
} else {
memset(cv, 0, length);
if (bpf_map_lookup_elem(fd, &pid, cv)) {
continue;
}
dcstat_apps_accumulator(cv);
memcpy(out, cv, sizeof(netdata_dcstat_pid_t));
}
}
}
pthread_mutex_unlock(&mutex_cgroup_shm);
}
/**
* Read global table
*
* Read the table with number of calls for all functions
*/
static void read_global_table()
{
uint32_t idx;
netdata_idx_t *val = dcstat_hash_values;
netdata_idx_t *stored = dcstat_values;
int fd = dcstat_maps[NETDATA_DCSTAT_GLOBAL_STATS].map_fd;
for (idx = NETDATA_KEY_DC_REFERENCE; idx < NETDATA_DIRECTORY_CACHE_END; idx++) {
if (!bpf_map_lookup_elem(fd, &idx, stored)) {
int i;
int end = ebpf_nprocs;
netdata_idx_t total = 0;
for (i = 0; i < end; i++)
total += stored[i];
val[idx] = total;
}
}
}
/**
* DCstat read hash
*
* This is the thread callback.
* This thread is necessary, because we cannot freeze the whole plugin to read the data.
*
* @param ptr It is a NULL value for this thread.
*
* @return It always returns NULL.
*/
void *ebpf_dcstat_read_hash(void *ptr)
{
read_thread_closed = 0;
heartbeat_t hb;
heartbeat_init(&hb);
ebpf_module_t *em = (ebpf_module_t *)ptr;
usec_t step = NETDATA_LATENCY_DCSTAT_SLEEP_MS * em->update_every;
while (!close_ebpf_plugin) {
usec_t dt = heartbeat_next(&hb, step);
(void)dt;
read_global_table();
}
read_thread_closed = 1;
return NULL;
}
/**
* Cachestat sum PIDs
*
* Sum values for all PIDs associated to a group
*
* @param publish output structure.
* @param root structure with listed IPs
*/
void ebpf_dcstat_sum_pids(netdata_publish_dcstat_t *publish, struct pid_on_target *root)
{
memset(&publish->curr, 0, sizeof(netdata_dcstat_pid_t));
netdata_dcstat_pid_t *dst = &publish->curr;
while (root) {
int32_t pid = root->pid;
netdata_publish_dcstat_t *w = dcstat_pid[pid];
if (w) {
netdata_dcstat_pid_t *src = &w->curr;
dst->cache_access += src->cache_access;
dst->file_system += src->file_system;
dst->not_found += src->not_found;
}
root = root->next;
}
}
/**
* Send data to Netdata calling auxiliary functions.
*
* @param root the target list.
*/
void ebpf_dcache_send_apps_data(struct target *root)
{
struct target *w;
collected_number value;
write_begin_chart(NETDATA_APPS_FAMILY, NETDATA_DC_HIT_CHART);
for (w = root; w; w = w->next) {
if (unlikely(w->exposed && w->processes)) {
ebpf_dcstat_sum_pids(&w->dcstat, w->root_pid);
uint64_t cache = w->dcstat.curr.cache_access;
uint64_t not_found = w->dcstat.curr.not_found;
dcstat_update_publish(&w->dcstat, cache, not_found);
value = (collected_number) w->dcstat.ratio;
write_chart_dimension(w->name, value);
}
}
write_end_chart();
write_begin_chart(NETDATA_APPS_FAMILY, NETDATA_DC_REFERENCE_CHART);
for (w = root; w; w = w->next) {
if (unlikely(w->exposed && w->processes)) {
if (w->dcstat.curr.cache_access < w->dcstat.prev.cache_access) {
w->dcstat.prev.cache_access = 0;
}
w->dcstat.cache_access = (long long)w->dcstat.curr.cache_access - (long long)w->dcstat.prev.cache_access;
value = (collected_number) w->dcstat.cache_access;
write_chart_dimension(w->name, value);
w->dcstat.prev.cache_access = w->dcstat.curr.cache_access;
}
}
write_end_chart();
write_begin_chart(NETDATA_APPS_FAMILY, NETDATA_DC_REQUEST_NOT_CACHE_CHART);
for (w = root; w; w = w->next) {
if (unlikely(w->exposed && w->processes)) {
if (w->dcstat.curr.file_system < w->dcstat.prev.file_system) {
w->dcstat.prev.file_system = 0;
}
value = (collected_number) (!w->dcstat.cache_access) ? 0 :
(long long )w->dcstat.curr.file_system - (long long)w->dcstat.prev.file_system;
write_chart_dimension(w->name, value);
w->dcstat.prev.file_system = w->dcstat.curr.file_system;
}
}
write_end_chart();
write_begin_chart(NETDATA_APPS_FAMILY, NETDATA_DC_REQUEST_NOT_FOUND_CHART);
for (w = root; w; w = w->next) {
if (unlikely(w->exposed && w->processes)) {
if (w->dcstat.curr.not_found < w->dcstat.prev.not_found) {
w->dcstat.prev.not_found = 0;
}
value = (collected_number) (!w->dcstat.cache_access) ? 0 :
(long long)w->dcstat.curr.not_found - (long long)w->dcstat.prev.not_found;
write_chart_dimension(w->name, value);
w->dcstat.prev.not_found = w->dcstat.curr.not_found;
}
}
write_end_chart();
}
/**
* Send global
*
* Send global charts to Netdata
*/
static void dcstat_send_global(netdata_publish_dcstat_t *publish)
{
dcstat_update_publish(publish, dcstat_hash_values[NETDATA_KEY_DC_REFERENCE],
dcstat_hash_values[NETDATA_KEY_DC_MISS]);
netdata_publish_syscall_t *ptr = dcstat_counter_publish_aggregated;
netdata_idx_t value = dcstat_hash_values[NETDATA_KEY_DC_REFERENCE];
if (value != ptr[NETDATA_DCSTAT_IDX_REFERENCE].pcall) {
ptr[NETDATA_DCSTAT_IDX_REFERENCE].ncall = value - ptr[NETDATA_DCSTAT_IDX_REFERENCE].pcall;
ptr[NETDATA_DCSTAT_IDX_REFERENCE].pcall = value;
value = dcstat_hash_values[NETDATA_KEY_DC_SLOW];
ptr[NETDATA_DCSTAT_IDX_SLOW].ncall = value - ptr[NETDATA_DCSTAT_IDX_SLOW].pcall;
ptr[NETDATA_DCSTAT_IDX_SLOW].pcall = value;
value = dcstat_hash_values[NETDATA_KEY_DC_MISS];
ptr[NETDATA_DCSTAT_IDX_MISS].ncall = value - ptr[NETDATA_DCSTAT_IDX_MISS].pcall;
ptr[NETDATA_DCSTAT_IDX_MISS].pcall = value;
} else {
ptr[NETDATA_DCSTAT_IDX_REFERENCE].ncall = 0;
ptr[NETDATA_DCSTAT_IDX_SLOW].ncall = 0;
ptr[NETDATA_DCSTAT_IDX_MISS].ncall = 0;
}
ebpf_one_dimension_write_charts(NETDATA_FILESYSTEM_FAMILY, NETDATA_DC_HIT_CHART,
ptr[NETDATA_DCSTAT_IDX_RATIO].dimension, publish->ratio);
write_count_chart(
NETDATA_DC_REFERENCE_CHART, NETDATA_FILESYSTEM_FAMILY,
&dcstat_counter_publish_aggregated[NETDATA_DCSTAT_IDX_REFERENCE], 3);
}
/**
* Create specific directory cache 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_dc_charts(char *type, int update_every)
{
ebpf_create_chart(type, NETDATA_DC_HIT_CHART, "Percentage of files inside directory cache",
EBPF_COMMON_DIMENSION_PERCENTAGE, NETDATA_DIRECTORY_CACHE_SUBMENU,
NETDATA_CGROUP_DC_HIT_RATIO_CONTEXT, NETDATA_EBPF_CHART_TYPE_LINE,
NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5700,
ebpf_create_global_dimension,
dcstat_counter_publish_aggregated, 1, update_every, NETDATA_EBPF_MODULE_NAME_DCSTAT);
ebpf_create_chart(type, NETDATA_DC_REFERENCE_CHART, "Count file access",
EBPF_COMMON_DIMENSION_FILES, NETDATA_DIRECTORY_CACHE_SUBMENU,
NETDATA_CGROUP_DC_REFERENCE_CONTEXT, NETDATA_EBPF_CHART_TYPE_LINE,
NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5701,
ebpf_create_global_dimension,
&dcstat_counter_publish_aggregated[NETDATA_DCSTAT_IDX_REFERENCE], 1,
update_every, NETDATA_EBPF_MODULE_NAME_DCSTAT);
ebpf_create_chart(type, NETDATA_DC_REQUEST_NOT_CACHE_CHART,
"Files not present inside directory cache",
EBPF_COMMON_DIMENSION_FILES, NETDATA_DIRECTORY_CACHE_SUBMENU,
NETDATA_CGROUP_DC_NOT_CACHE_CONTEXT, NETDATA_EBPF_CHART_TYPE_LINE,
NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5702,
ebpf_create_global_dimension,
&dcstat_counter_publish_aggregated[NETDATA_DCSTAT_IDX_SLOW], 1,
update_every, NETDATA_EBPF_MODULE_NAME_DCSTAT);
ebpf_create_chart(type, NETDATA_DC_REQUEST_NOT_FOUND_CHART,
"Files not found",
EBPF_COMMON_DIMENSION_FILES, NETDATA_DIRECTORY_CACHE_SUBMENU,
NETDATA_CGROUP_DC_NOT_FOUND_CONTEXT, NETDATA_EBPF_CHART_TYPE_LINE,
NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5703,
ebpf_create_global_dimension,
&dcstat_counter_publish_aggregated[NETDATA_DCSTAT_IDX_MISS], 1,
update_every, NETDATA_EBPF_MODULE_NAME_DCSTAT);
}
/**
* Obsolete specific directory cache 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_dc_charts(char *type, int update_every)
{
ebpf_write_chart_obsolete(type, NETDATA_DC_HIT_CHART,
"Percentage of files inside directory cache",
EBPF_COMMON_DIMENSION_PERCENTAGE, NETDATA_DIRECTORY_CACHE_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CGROUP_DC_HIT_RATIO_CONTEXT,
NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5700, update_every);
ebpf_write_chart_obsolete(type, NETDATA_DC_REFERENCE_CHART,
"Count file access",
EBPF_COMMON_DIMENSION_FILES, NETDATA_DIRECTORY_CACHE_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CGROUP_DC_REFERENCE_CONTEXT,
NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5701, update_every);
ebpf_write_chart_obsolete(type, NETDATA_DC_REQUEST_NOT_CACHE_CHART,
"Files not present inside directory cache",
EBPF_COMMON_DIMENSION_FILES, NETDATA_DIRECTORY_CACHE_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CGROUP_DC_NOT_CACHE_CONTEXT,
NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5702, update_every);
ebpf_write_chart_obsolete(type, NETDATA_DC_REQUEST_NOT_FOUND_CHART,
"Files not found",
EBPF_COMMON_DIMENSION_FILES, NETDATA_DIRECTORY_CACHE_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CGROUP_DC_NOT_FOUND_CONTEXT,
NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5703, update_every);
}
/**
* Cachestat sum PIDs
*
* Sum values for all PIDs associated to a group
*
* @param publish output structure.
* @param root structure with listed IPs
*/
void ebpf_dc_sum_cgroup_pids(netdata_publish_dcstat_t *publish, struct pid_on_target2 *root)
{
memset(&publish->curr, 0, sizeof(netdata_dcstat_pid_t));
netdata_dcstat_pid_t *dst = &publish->curr;
while (root) {
netdata_dcstat_pid_t *src = &root->dc;
dst->cache_access += src->cache_access;
dst->file_system += src->file_system;
dst->not_found += src->not_found;
root = root->next;
}
}
/**
* Calc chart values
*
* Do necessary math to plot charts.
*/
void ebpf_dc_calc_chart_values()
{
ebpf_cgroup_target_t *ect;
for (ect = ebpf_cgroup_pids; ect ; ect = ect->next) {
ebpf_dc_sum_cgroup_pids(&ect->publish_dc, ect->pids);
uint64_t cache = ect->publish_dc.curr.cache_access;
uint64_t not_found = ect->publish_dc.curr.not_found;
dcstat_update_publish(&ect->publish_dc, cache, not_found);
ect->publish_dc.cache_access = (long long)ect->publish_dc.curr.cache_access -
(long long)ect->publish_dc.prev.cache_access;
ect->publish_dc.prev.cache_access = ect->publish_dc.curr.cache_access;
if (ect->publish_dc.curr.not_found < ect->publish_dc.prev.not_found) {
ect->publish_dc.prev.not_found = 0;
}
}
}
/**
* Create Systemd directory cache 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_dc_charts(int update_every)
{
ebpf_create_charts_on_systemd(NETDATA_DC_HIT_CHART,
"Percentage of files inside directory cache",
EBPF_COMMON_DIMENSION_PERCENTAGE,
NETDATA_DIRECTORY_CACHE_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE,
21200,
ebpf_algorithms[NETDATA_EBPF_ABSOLUTE_IDX],
NETDATA_SYSTEMD_DC_HIT_RATIO_CONTEXT, NETDATA_EBPF_MODULE_NAME_DCSTAT,
update_every);
ebpf_create_charts_on_systemd(NETDATA_DC_REFERENCE_CHART,
"Count file access",
EBPF_COMMON_DIMENSION_FILES,
NETDATA_DIRECTORY_CACHE_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE,
21201,
ebpf_algorithms[NETDATA_EBPF_ABSOLUTE_IDX],
NETDATA_SYSTEMD_DC_REFERENCE_CONTEXT, NETDATA_EBPF_MODULE_NAME_DCSTAT,
update_every);
ebpf_create_charts_on_systemd(NETDATA_DC_REQUEST_NOT_CACHE_CHART,
"Files not present inside directory cache",
EBPF_COMMON_DIMENSION_FILES,
NETDATA_DIRECTORY_CACHE_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE,
21202,
ebpf_algorithms[NETDATA_EBPF_ABSOLUTE_IDX],
NETDATA_SYSTEMD_DC_NOT_CACHE_CONTEXT, NETDATA_EBPF_MODULE_NAME_DCSTAT,
update_every);
ebpf_create_charts_on_systemd(NETDATA_DC_REQUEST_NOT_FOUND_CHART,
"Files not found",
EBPF_COMMON_DIMENSION_FILES,
NETDATA_DIRECTORY_CACHE_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE,
21202,
ebpf_algorithms[NETDATA_EBPF_ABSOLUTE_IDX],
NETDATA_SYSTEMD_DC_NOT_FOUND_CONTEXT, NETDATA_EBPF_MODULE_NAME_DCSTAT,
update_every);
}
/**
* Send Directory Cache charts
*
* Send collected data to Netdata.
*
* @return It returns the status for chart creation, if it is necessary to remove a specific dimension, zero is returned
* otherwise function returns 1 to avoid chart recreation
*/
static int ebpf_send_systemd_dc_charts()
{
int ret = 1;
collected_number value;
ebpf_cgroup_target_t *ect;
write_begin_chart(NETDATA_SERVICE_FAMILY, NETDATA_DC_HIT_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_dc.ratio);
} else
ret = 0;
}
write_end_chart();
write_begin_chart(NETDATA_SERVICE_FAMILY, NETDATA_DC_REFERENCE_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_dc.cache_access);
}
}
write_end_chart();
write_begin_chart(NETDATA_SERVICE_FAMILY, NETDATA_DC_REQUEST_NOT_CACHE_CHART);
for (ect = ebpf_cgroup_pids; ect ; ect = ect->next) {
if (unlikely(ect->systemd) && unlikely(ect->updated)) {
value = (collected_number) (!ect->publish_dc.cache_access) ? 0 :
(long long )ect->publish_dc.curr.file_system - (long long)ect->publish_dc.prev.file_system;
ect->publish_dc.prev.file_system = ect->publish_dc.curr.file_system;
write_chart_dimension(ect->name, (long long) value);
}
}
write_end_chart();
write_begin_chart(NETDATA_SERVICE_FAMILY, NETDATA_DC_REQUEST_NOT_FOUND_CHART);
for (ect = ebpf_cgroup_pids; ect ; ect = ect->next) {
if (unlikely(ect->systemd) && unlikely(ect->updated)) {
value = (collected_number) (!ect->publish_dc.cache_access) ? 0 :
(long long)ect->publish_dc.curr.not_found - (long long)ect->publish_dc.prev.not_found;
ect->publish_dc.prev.not_found = ect->publish_dc.curr.not_found;
write_chart_dimension(ect->name, (long long) value);
}
}
write_end_chart();
return ret;
}
/**
* Send Directory Cache charts
*
* Send collected data to Netdata.
*
*/
static void ebpf_send_specific_dc_data(char *type, netdata_publish_dcstat_t *pdc)
{
collected_number value;
write_begin_chart(type, NETDATA_DC_HIT_CHART);
write_chart_dimension(dcstat_counter_publish_aggregated[NETDATA_DCSTAT_IDX_RATIO].name,
(long long) pdc->ratio);
write_end_chart();
write_begin_chart(type, NETDATA_DC_REFERENCE_CHART);
write_chart_dimension(dcstat_counter_publish_aggregated[NETDATA_DCSTAT_IDX_REFERENCE].name,
(long long) pdc->cache_access);
write_end_chart();
value = (collected_number) (!pdc->cache_access) ? 0 :
(long long )pdc->curr.file_system - (long long)pdc->prev.file_system;
pdc->prev.file_system = pdc->curr.file_system;
write_begin_chart(type, NETDATA_DC_REQUEST_NOT_CACHE_CHART);
write_chart_dimension(dcstat_counter_publish_aggregated[NETDATA_DCSTAT_IDX_SLOW].name, (long long) value);
write_end_chart();
value = (collected_number) (!pdc->cache_access) ? 0 :
(long long)pdc->curr.not_found - (long long)pdc->prev.not_found;
pdc->prev.not_found = pdc->curr.not_found;
write_begin_chart(type, NETDATA_DC_REQUEST_NOT_FOUND_CHART);
write_chart_dimension(dcstat_counter_publish_aggregated[NETDATA_DCSTAT_IDX_MISS].name, (long long) value);
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_dc_send_cgroup_data(int update_every)
{
if (!ebpf_cgroup_pids)
return;
pthread_mutex_lock(&mutex_cgroup_shm);
ebpf_cgroup_target_t *ect;
ebpf_dc_calc_chart_values();
int has_systemd = shm_ebpf_cgroup.header->systemd_enabled;
if (has_systemd) {
static int systemd_charts = 0;
if (!systemd_charts) {
ebpf_create_systemd_dc_charts(update_every);
systemd_charts = 1;
}
systemd_charts = ebpf_send_systemd_dc_charts();
}
for (ect = ebpf_cgroup_pids; ect ; ect = ect->next) {
if (ect->systemd)
continue;
if (!(ect->flags & NETDATA_EBPF_CGROUP_HAS_DC_CHART) && ect->updated) {
ebpf_create_specific_dc_charts(ect->name, update_every);
ect->flags |= NETDATA_EBPF_CGROUP_HAS_DC_CHART;
}
if (ect->flags & NETDATA_EBPF_CGROUP_HAS_DC_CHART) {
if (ect->updated) {
ebpf_send_specific_dc_data(ect->name, &ect->publish_dc);
} else {
ebpf_obsolete_specific_dc_charts(ect->name, update_every);
ect->flags &= ~NETDATA_EBPF_CGROUP_HAS_DC_CHART;
}
}
}
pthread_mutex_unlock(&mutex_cgroup_shm);
}
/**
* Main loop for this collector.
*/
static void dcstat_collector(ebpf_module_t *em)
{
dcstat_threads.thread = mallocz(sizeof(netdata_thread_t));
dcstat_threads.start_routine = ebpf_dcstat_read_hash;
netdata_thread_create(dcstat_threads.thread, dcstat_threads.name, NETDATA_THREAD_OPTION_JOINABLE,
ebpf_dcstat_read_hash, em);
netdata_publish_dcstat_t publish;
memset(&publish, 0, sizeof(publish));
int apps = em->apps_charts;
int cgroups = em->cgroup_charts;
int update_every = em->update_every;
int counter = update_every - 1;
while (!close_ebpf_plugin) {
pthread_mutex_lock(&collect_data_mutex);
pthread_cond_wait(&collect_data_cond_var, &collect_data_mutex);
if (++counter == update_every) {
counter = 0;
if (apps)
read_apps_table();
if (cgroups)
ebpf_update_dc_cgroup();
pthread_mutex_lock(&lock);
dcstat_send_global(&publish);
if (apps)
ebpf_dcache_send_apps_data(apps_groups_root_target);
if (cgroups)
ebpf_dc_send_cgroup_data(update_every);
pthread_mutex_unlock(&lock);
}
pthread_mutex_unlock(&collect_data_mutex);
}
}
/*****************************************************************
*
* INITIALIZE THREAD
*
*****************************************************************/
/**
* Create filesystem 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_filesystem_charts(int update_every)
{
ebpf_create_chart(NETDATA_FILESYSTEM_FAMILY, NETDATA_DC_HIT_CHART,
"Percentage of files inside directory cache",
EBPF_COMMON_DIMENSION_PERCENTAGE, NETDATA_DIRECTORY_CACHE_SUBMENU,
NULL,
NETDATA_EBPF_CHART_TYPE_LINE,
21200,
ebpf_create_global_dimension,
dcstat_counter_publish_aggregated, 1, update_every, NETDATA_EBPF_MODULE_NAME_DCSTAT);
ebpf_create_chart(NETDATA_FILESYSTEM_FAMILY, NETDATA_DC_REFERENCE_CHART,
"Variables used to calculate hit ratio.",
EBPF_COMMON_DIMENSION_FILES, NETDATA_DIRECTORY_CACHE_SUBMENU,
NULL,
NETDATA_EBPF_CHART_TYPE_LINE,
21201,
ebpf_create_global_dimension,
&dcstat_counter_publish_aggregated[NETDATA_DCSTAT_IDX_REFERENCE], 3,
update_every, NETDATA_EBPF_MODULE_NAME_DCSTAT);
fflush(stdout);
}
/**
* 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_dcstat_allocate_global_vectors(int apps)
{
if (apps)
dcstat_pid = callocz((size_t)pid_max, sizeof(netdata_publish_dcstat_t *));
dcstat_vector = callocz((size_t)ebpf_nprocs, sizeof(netdata_dcstat_pid_t));
dcstat_values = callocz((size_t)ebpf_nprocs, sizeof(netdata_idx_t));
memset(dcstat_counter_aggregated_data, 0, NETDATA_DCSTAT_IDX_END * sizeof(netdata_syscall_stat_t));
memset(dcstat_counter_publish_aggregated, 0, NETDATA_DCSTAT_IDX_END * sizeof(netdata_publish_syscall_t));
}
/*****************************************************************
*
* MAIN THREAD
*
*****************************************************************/
/*
* Load BPF
*
* Load BPF files.
*
* @param em the structure with configuration
*/
static int ebpf_dcstat_load_bpf(ebpf_module_t *em)
{
int ret = 0;
if (em->load == EBPF_LOAD_LEGACY) {
probe_links = ebpf_load_program(ebpf_plugin_dir, em, running_on_kernel, isrh, &objects);
if (!probe_links) {
ret = -1;
}
}
#ifdef LIBBPF_MAJOR_VERSION
else {
bpf_obj = dc_bpf__open();
if (!bpf_obj)
ret = -1;
else
ret = ebpf_dc_load_and_attach(bpf_obj, em);
}
#endif
if (ret)
error("%s %s", EBPF_DEFAULT_ERROR_MSG, em->thread_name);
return ret;
}
/**
* Directory Cache thread
*
* Thread used to make dcstat thread
*
* @param ptr a pointer to `struct ebpf_module`
*
* @return It always returns NULL
*/
void *ebpf_dcstat_thread(void *ptr)
{
netdata_thread_cleanup_push(ebpf_dcstat_cleanup, ptr);
ebpf_module_t *em = (ebpf_module_t *)ptr;
em->maps = dcstat_maps;
ebpf_update_pid_table(&dcstat_maps[NETDATA_DCSTAT_PID_STATS], em);
ebpf_update_names(dc_optional_name, em);
if (!em->enabled)
goto enddcstat;
#ifdef LIBBPF_MAJOR_VERSION
ebpf_adjust_thread_load(em, default_btf);
#endif
if (ebpf_dcstat_load_bpf(em)) {
em->enabled = CONFIG_BOOLEAN_NO;
goto enddcstat;
}
ebpf_dcstat_allocate_global_vectors(em->apps_charts);
int algorithms[NETDATA_DCSTAT_IDX_END] = {
NETDATA_EBPF_ABSOLUTE_IDX, NETDATA_EBPF_ABSOLUTE_IDX, NETDATA_EBPF_ABSOLUTE_IDX,
NETDATA_EBPF_ABSOLUTE_IDX
};
ebpf_global_labels(dcstat_counter_aggregated_data, dcstat_counter_publish_aggregated,
dcstat_counter_dimension_name, dcstat_counter_dimension_name,
algorithms, NETDATA_DCSTAT_IDX_END);
pthread_mutex_lock(&lock);
ebpf_create_filesystem_charts(em->update_every);
ebpf_update_stats(&plugin_statistics, em);
pthread_mutex_unlock(&lock);
dcstat_collector(em);
enddcstat:
if (!em->enabled)
ebpf_update_disabled_plugin_stats(em);
netdata_thread_cleanup_pop(1);
return NULL;
}
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