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// SPDX-License-Identifier: GPL-3.0-or-later
#include "ebpf.h"
#include "ebpf_cachestat.h"
netdata_publish_cachestat_t **cachestat_pid;
static struct bpf_link **probe_links = NULL;
static struct bpf_object *objects = NULL;
static char *cachestat_counter_dimension_name[NETDATA_CACHESTAT_END] = { "ratio", "dirty", "hit",
"miss" };
static netdata_syscall_stat_t cachestat_counter_aggregated_data[NETDATA_CACHESTAT_END];
static netdata_publish_syscall_t cachestat_counter_publish_aggregated[NETDATA_CACHESTAT_END];
netdata_cachestat_pid_t *cachestat_vector = NULL;
static netdata_idx_t cachestat_hash_values[NETDATA_CACHESTAT_END];
static netdata_idx_t *cachestat_values = NULL;
static int read_thread_closed = 1;
struct netdata_static_thread cachestat_threads = {"CACHESTAT KERNEL",
NULL, NULL, 1, NULL,
NULL, NULL};
static ebpf_local_maps_t cachestat_maps[] = {{.name = "cstat_global", .internal_input = NETDATA_CACHESTAT_END,
.user_input = 0, .type = NETDATA_EBPF_MAP_STATIC,
.map_fd = ND_EBPF_MAP_FD_NOT_INITIALIZED},
{.name = "cstat_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 = "cstat_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}};
struct config cachestat_config = { .first_section = NULL,
.last_section = NULL,
.mutex = NETDATA_MUTEX_INITIALIZER,
.index = { .avl_tree = { .root = NULL, .compar = appconfig_section_compare },
.rwlock = AVL_LOCK_INITIALIZER } };
/*****************************************************************
*
* FUNCTIONS TO CLOSE THE THREAD
*
*****************************************************************/
/**
* Clean PID structures
*
* Clean the allocated structures.
*/
void clean_cachestat_pid_structures() {
struct pid_stat *pids = root_of_pids;
while (pids) {
freez(cachestat_pid[pids->pid]);
pids = pids->next;
}
}
/**
* Clean up the main thread.
*
* @param ptr thread data.
*/
static void ebpf_cachestat_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);
}
ebpf_cleanup_publish_syscall(cachestat_counter_publish_aggregated);
freez(cachestat_vector);
freez(cachestat_values);
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);
}
}
/*****************************************************************
*
* COMMON FUNCTIONS
*
*****************************************************************/
/**
* Update publish
*
* Update publish values before to write dimension.
*
* @param out strcuture that will receive data.
* @param mpa calls for mark_page_accessed during the last second.
* @param mbd calls for mark_buffer_dirty during the last second.
* @param apcl calls for add_to_page_cache_lru during the last second.
* @param apd calls for account_page_dirtied during the last second.
*/
void cachestat_update_publish(netdata_publish_cachestat_t *out, uint64_t mpa, uint64_t mbd,
uint64_t apcl, uint64_t apd)
{
// Adapted algorithm from https://github.com/iovisor/bcc/blob/master/tools/cachestat.py#L126-L138
calculated_number total = (calculated_number) (((long long)mpa) - ((long long)mbd));
if (total < 0)
total = 0;
calculated_number misses = (calculated_number) ( ((long long) apcl) - ((long long) apd) );
if (misses < 0)
misses = 0;
// If hits are < 0, then its possible misses are overestimate due to possibly page cache read ahead adding
// more pages than needed. In this case just assume misses as total and reset hits.
calculated_number hits = total - misses;
if (hits < 0 ) {
misses = total;
hits = 0;
}
calculated_number ratio = (total > 0) ? hits/total : 1;
out->ratio = (long long )(ratio*100);
out->hit = (long long)hits;
out->miss = (long long)misses;
}
/**
* Save previous values
*
* Save values used this time.
*
* @param publish
*/
static void save_previous_values(netdata_publish_cachestat_t *publish) {
publish->prev.mark_page_accessed = cachestat_hash_values[NETDATA_KEY_CALLS_MARK_PAGE_ACCESSED];
publish->prev.account_page_dirtied = cachestat_hash_values[NETDATA_KEY_CALLS_ACCOUNT_PAGE_DIRTIED];
publish->prev.add_to_page_cache_lru = cachestat_hash_values[NETDATA_KEY_CALLS_ADD_TO_PAGE_CACHE_LRU];
publish->prev.mark_buffer_dirty = cachestat_hash_values[NETDATA_KEY_CALLS_MARK_BUFFER_DIRTY];
}
/**
* Calculate statistics
*
* @param publish the structure where we will store the data.
*/
static void calculate_stats(netdata_publish_cachestat_t *publish) {
if (!publish->prev.mark_page_accessed) {
save_previous_values(publish);
return;
}
uint64_t mpa = cachestat_hash_values[NETDATA_KEY_CALLS_MARK_PAGE_ACCESSED] - publish->prev.mark_page_accessed;
uint64_t mbd = cachestat_hash_values[NETDATA_KEY_CALLS_MARK_BUFFER_DIRTY] - publish->prev.mark_buffer_dirty;
uint64_t apcl = cachestat_hash_values[NETDATA_KEY_CALLS_ADD_TO_PAGE_CACHE_LRU] - publish->prev.add_to_page_cache_lru;
uint64_t apd = cachestat_hash_values[NETDATA_KEY_CALLS_ACCOUNT_PAGE_DIRTIED] - publish->prev.account_page_dirtied;
save_previous_values(publish);
// We are changing the original algorithm to have a smooth ratio.
cachestat_update_publish(publish, mpa, mbd, apcl, apd);
}
/*****************************************************************
*
* APPS
*
*****************************************************************/
/**
* Apps Accumulator
*
* Sum all values read from kernel and store in the first address.
*
* @param out the vector with read values.
*/
static void cachestat_apps_accumulator(netdata_cachestat_pid_t *out)
{
int i, end = (running_on_kernel >= NETDATA_KERNEL_V4_15) ? ebpf_nprocs : 1;
netdata_cachestat_pid_t *total = &out[0];
for (i = 1; i < end; i++) {
netdata_cachestat_pid_t *w = &out[i];
total->account_page_dirtied += w->account_page_dirtied;
total->add_to_page_cache_lru += w->add_to_page_cache_lru;
total->mark_buffer_dirty += w->mark_buffer_dirty;
total->mark_page_accessed += w->mark_page_accessed;
}
}
/**
* 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 cachestat_save_pid_values(netdata_publish_cachestat_t *out, netdata_cachestat_pid_t *publish)
{
if (!out->current.mark_page_accessed) {
memcpy(&out->current, &publish[0], sizeof(netdata_cachestat_pid_t));
return;
}
memcpy(&out->prev, &out->current, sizeof(netdata_cachestat_pid_t));
memcpy(&out->current, &publish[0], sizeof(netdata_cachestat_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 cachestat_fill_pid(uint32_t current_pid, netdata_cachestat_pid_t *publish)
{
netdata_publish_cachestat_t *curr = cachestat_pid[current_pid];
if (!curr) {
curr = callocz(1, sizeof(netdata_publish_cachestat_t));
cachestat_pid[current_pid] = curr;
cachestat_save_pid_values(curr, publish);
return;
}
cachestat_save_pid_values(curr, publish);
}
/**
* Read APPS table
*
* Read the apps table and store data inside the structure.
*/
static void read_apps_table()
{
netdata_cachestat_pid_t *cv = cachestat_vector;
uint32_t key;
struct pid_stat *pids = root_of_pids;
int fd = cachestat_maps[NETDATA_CACHESTAT_PID_STATS].map_fd;
size_t length = sizeof(netdata_cachestat_pid_t)*ebpf_nprocs;
while (pids) {
key = pids->pid;
if (bpf_map_lookup_elem(fd, &key, cv)) {
pids = pids->next;
continue;
}
cachestat_apps_accumulator(cv);
cachestat_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_cachestat_cgroup()
{
netdata_cachestat_pid_t *cv = cachestat_vector;
int fd = cachestat_maps[NETDATA_CACHESTAT_PID_STATS].map_fd;
size_t length = sizeof(netdata_cachestat_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_cachestat_pid_t *out = &pids->cachestat;
if (likely(cachestat_pid) && cachestat_pid[pid]) {
netdata_publish_cachestat_t *in = cachestat_pid[pid];
memcpy(out, &in->current, sizeof(netdata_cachestat_pid_t));
} else {
memset(cv, 0, length);
if (bpf_map_lookup_elem(fd, &pid, cv)) {
continue;
}
cachestat_apps_accumulator(cv);
memcpy(out, cv, sizeof(netdata_cachestat_pid_t));
}
}
}
pthread_mutex_unlock(&mutex_cgroup_shm);
}
/**
* 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_cachestat_create_apps_charts(struct ebpf_module *em, void *ptr)
{
struct target *root = ptr;
ebpf_create_charts_on_apps(NETDATA_CACHESTAT_HIT_RATIO_CHART,
"The ratio is calculated dividing the Hit pages per total cache accesses without counting dirties.",
EBPF_COMMON_DIMENSION_PERCENTAGE,
NETDATA_CACHESTAT_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE,
20090,
ebpf_algorithms[NETDATA_EBPF_ABSOLUTE_IDX],
root, em->update_every, NETDATA_EBPF_MODULE_NAME_CACHESTAT);
ebpf_create_charts_on_apps(NETDATA_CACHESTAT_DIRTY_CHART,
"Number of pages marked as dirty. When a page is called dirty, this means that the data stored inside the page needs to be written to devices.",
EBPF_CACHESTAT_DIMENSION_PAGE,
NETDATA_CACHESTAT_SUBMENU,
NETDATA_EBPF_CHART_TYPE_STACKED,
20091,
ebpf_algorithms[NETDATA_EBPF_INCREMENTAL_IDX],
root, em->update_every, NETDATA_EBPF_MODULE_NAME_CACHESTAT);
ebpf_create_charts_on_apps(NETDATA_CACHESTAT_HIT_CHART,
"Number of cache access without counting dirty pages and page additions.",
EBPF_CACHESTAT_DIMENSION_HITS,
NETDATA_CACHESTAT_SUBMENU,
NETDATA_EBPF_CHART_TYPE_STACKED,
20092,
ebpf_algorithms[NETDATA_EBPF_ABSOLUTE_IDX],
root, em->update_every, NETDATA_EBPF_MODULE_NAME_CACHESTAT);
ebpf_create_charts_on_apps(NETDATA_CACHESTAT_MISSES_CHART,
"Page caches added without counting dirty pages",
EBPF_CACHESTAT_DIMENSION_MISSES,
NETDATA_CACHESTAT_SUBMENU,
NETDATA_EBPF_CHART_TYPE_STACKED,
20093,
ebpf_algorithms[NETDATA_EBPF_ABSOLUTE_IDX],
root, em->update_every, NETDATA_EBPF_MODULE_NAME_CACHESTAT);
}
/*****************************************************************
*
* MAIN LOOP
*
*****************************************************************/
/**
* Read global counter
*
* Read the table with number of calls for all functions
*/
static void read_global_table()
{
uint32_t idx;
netdata_idx_t *val = cachestat_hash_values;
netdata_idx_t *stored = cachestat_values;
int fd = cachestat_maps[NETDATA_CACHESTAT_GLOBAL_STATS].map_fd;
for (idx = NETDATA_KEY_CALLS_ADD_TO_PAGE_CACHE_LRU; idx < NETDATA_CACHESTAT_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;
}
}
}
/**
* Socket read hash
*
* This is the thread callback.
* This thread is necessary, because we cannot freeze the whole plugin to read the data on very busy socket.
*
* @param ptr It is a NULL value for this thread.
*
* @return It always returns NULL.
*/
void *ebpf_cachestat_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_CACHESTAT_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;
}
/**
* Send global
*
* Send global charts to Netdata
*/
static void cachestat_send_global(netdata_publish_cachestat_t *publish)
{
calculate_stats(publish);
netdata_publish_syscall_t *ptr = cachestat_counter_publish_aggregated;
ebpf_one_dimension_write_charts(
NETDATA_EBPF_MEMORY_GROUP, NETDATA_CACHESTAT_HIT_RATIO_CHART, ptr[NETDATA_CACHESTAT_IDX_RATIO].dimension,
publish->ratio);
ebpf_one_dimension_write_charts(
NETDATA_EBPF_MEMORY_GROUP, NETDATA_CACHESTAT_DIRTY_CHART, ptr[NETDATA_CACHESTAT_IDX_DIRTY].dimension,
cachestat_hash_values[NETDATA_KEY_CALLS_MARK_BUFFER_DIRTY]);
ebpf_one_dimension_write_charts(
NETDATA_EBPF_MEMORY_GROUP, NETDATA_CACHESTAT_HIT_CHART, ptr[NETDATA_CACHESTAT_IDX_HIT].dimension, publish->hit);
ebpf_one_dimension_write_charts(
NETDATA_EBPF_MEMORY_GROUP, NETDATA_CACHESTAT_MISSES_CHART, ptr[NETDATA_CACHESTAT_IDX_MISS].dimension,
publish->miss);
}
/**
* Cachestat sum PIDs
*
* Sum values for all PIDs associated to a group
*
* @param publish output structure.
* @param root structure with listed IPs
*/
void ebpf_cachestat_sum_pids(netdata_publish_cachestat_t *publish, struct pid_on_target *root)
{
memcpy(&publish->prev, &publish->current,sizeof(publish->current));
memset(&publish->current, 0, sizeof(publish->current));
netdata_cachestat_pid_t *dst = &publish->current;
while (root) {
int32_t pid = root->pid;
netdata_publish_cachestat_t *w = cachestat_pid[pid];
if (w) {
netdata_cachestat_pid_t *src = &w->current;
dst->account_page_dirtied += src->account_page_dirtied;
dst->add_to_page_cache_lru += src->add_to_page_cache_lru;
dst->mark_buffer_dirty += src->mark_buffer_dirty;
dst->mark_page_accessed += src->mark_page_accessed;
}
root = root->next;
}
}
/**
* Send data to Netdata calling auxiliar functions.
*
* @param root the target list.
*/
void ebpf_cache_send_apps_data(struct target *root)
{
struct target *w;
collected_number value;
write_begin_chart(NETDATA_APPS_FAMILY, NETDATA_CACHESTAT_HIT_RATIO_CHART);
for (w = root; w; w = w->next) {
if (unlikely(w->exposed && w->processes)) {
ebpf_cachestat_sum_pids(&w->cachestat, w->root_pid);
netdata_cachestat_pid_t *current = &w->cachestat.current;
netdata_cachestat_pid_t *prev = &w->cachestat.prev;
uint64_t mpa = current->mark_page_accessed - prev->mark_page_accessed;
uint64_t mbd = current->mark_buffer_dirty - prev->mark_buffer_dirty;
w->cachestat.dirty = mbd;
uint64_t apcl = current->add_to_page_cache_lru - prev->add_to_page_cache_lru;
uint64_t apd = current->account_page_dirtied - prev->account_page_dirtied;
cachestat_update_publish(&w->cachestat, mpa, mbd, apcl, apd);
value = (collected_number) w->cachestat.ratio;
// Here we are using different approach to have a chart more smooth
write_chart_dimension(w->name, value);
}
}
write_end_chart();
write_begin_chart(NETDATA_APPS_FAMILY, NETDATA_CACHESTAT_DIRTY_CHART);
for (w = root; w; w = w->next) {
if (unlikely(w->exposed && w->processes)) {
value = (collected_number) w->cachestat.dirty;
write_chart_dimension(w->name, value);
}
}
write_end_chart();
write_begin_chart(NETDATA_APPS_FAMILY, NETDATA_CACHESTAT_HIT_CHART);
for (w = root; w; w = w->next) {
if (unlikely(w->exposed && w->processes)) {
value = (collected_number) w->cachestat.hit;
write_chart_dimension(w->name, value);
}
}
write_end_chart();
write_begin_chart(NETDATA_APPS_FAMILY, NETDATA_CACHESTAT_MISSES_CHART);
for (w = root; w; w = w->next) {
if (unlikely(w->exposed && w->processes)) {
value = (collected_number) w->cachestat.miss;
write_chart_dimension(w->name, value);
}
}
write_end_chart();
}
/**
* Cachestat sum PIDs
*
* Sum values for all PIDs associated to a group
*
* @param publish output structure.
* @param root structure with listed IPs
*/
void ebpf_cachestat_sum_cgroup_pids(netdata_publish_cachestat_t *publish, struct pid_on_target2 *root)
{
memcpy(&publish->prev, &publish->current,sizeof(publish->current));
memset(&publish->current, 0, sizeof(publish->current));
netdata_cachestat_pid_t *dst = &publish->current;
while (root) {
netdata_cachestat_pid_t *src = &root->cachestat;
dst->account_page_dirtied += src->account_page_dirtied;
dst->add_to_page_cache_lru += src->add_to_page_cache_lru;
dst->mark_buffer_dirty += src->mark_buffer_dirty;
dst->mark_page_accessed += src->mark_page_accessed;
root = root->next;
}
}
/**
* Calc chart values
*
* Do necessary math to plot charts.
*/
void ebpf_cachestat_calc_chart_values()
{
ebpf_cgroup_target_t *ect;
for (ect = ebpf_cgroup_pids; ect ; ect = ect->next) {
ebpf_cachestat_sum_cgroup_pids(&ect->publish_cachestat, ect->pids);
netdata_cachestat_pid_t *current = &ect->publish_cachestat.current;
netdata_cachestat_pid_t *prev = &ect->publish_cachestat.prev;
uint64_t mpa = current->mark_page_accessed - prev->mark_page_accessed;
uint64_t mbd = current->mark_buffer_dirty - prev->mark_buffer_dirty;
ect->publish_cachestat.dirty = mbd;
uint64_t apcl = current->add_to_page_cache_lru - prev->add_to_page_cache_lru;
uint64_t apd = current->account_page_dirtied - prev->account_page_dirtied;
cachestat_update_publish(&ect->publish_cachestat, mpa, mbd, apcl, apd);
}
}
/**
* Create Systemd cachestat 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_cachestat_charts(int update_every)
{
ebpf_create_charts_on_systemd(NETDATA_CACHESTAT_HIT_RATIO_CHART,
"Hit is calculating using total cache added without dirties per total added because of red misses.",
EBPF_COMMON_DIMENSION_PERCENTAGE, NETDATA_CACHESTAT_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE, 21100,
ebpf_algorithms[NETDATA_EBPF_ABSOLUTE_IDX],
NETDATA_SYSTEMD_CACHESTAT_HIT_RATIO_CONTEXT, NETDATA_EBPF_MODULE_NAME_CACHESTAT,
update_every);
ebpf_create_charts_on_systemd(NETDATA_CACHESTAT_DIRTY_CHART,
"Number of dirty pages added to the page cache.",
EBPF_CACHESTAT_DIMENSION_PAGE, NETDATA_CACHESTAT_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE, 21101,
ebpf_algorithms[NETDATA_EBPF_ABSOLUTE_IDX],
NETDATA_SYSTEMD_CACHESTAT_MODIFIED_CACHE_CONTEXT, NETDATA_EBPF_MODULE_NAME_CACHESTAT,
update_every);
ebpf_create_charts_on_systemd(NETDATA_CACHESTAT_HIT_CHART, "Hits are function calls that Netdata counts.",
EBPF_CACHESTAT_DIMENSION_HITS, NETDATA_CACHESTAT_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE, 21102,
ebpf_algorithms[NETDATA_EBPF_ABSOLUTE_IDX],
NETDATA_SYSTEMD_CACHESTAT_HIT_FILE_CONTEXT, NETDATA_EBPF_MODULE_NAME_CACHESTAT,
update_every);
ebpf_create_charts_on_systemd(NETDATA_CACHESTAT_MISSES_CHART, "Misses are function calls that Netdata counts.",
EBPF_CACHESTAT_DIMENSION_MISSES, NETDATA_CACHESTAT_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE, 21103,
ebpf_algorithms[NETDATA_EBPF_ABSOLUTE_IDX],
NETDATA_SYSTEMD_CACHESTAT_MISS_FILES_CONTEXT, NETDATA_EBPF_MODULE_NAME_CACHESTAT,
update_every);
}
/**
* Send Cache Stat 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_cachestat_charts()
{
int ret = 1;
ebpf_cgroup_target_t *ect;
write_begin_chart(NETDATA_SERVICE_FAMILY, NETDATA_CACHESTAT_HIT_RATIO_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_cachestat.ratio);
} else
ret = 0;
}
write_end_chart();
write_begin_chart(NETDATA_SERVICE_FAMILY, NETDATA_CACHESTAT_DIRTY_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_cachestat.dirty);
}
}
write_end_chart();
write_begin_chart(NETDATA_SERVICE_FAMILY, NETDATA_CACHESTAT_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_cachestat.hit);
}
}
write_end_chart();
write_begin_chart(NETDATA_SERVICE_FAMILY, NETDATA_CACHESTAT_MISSES_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_cachestat.miss);
}
}
write_end_chart();
return ret;
}
/**
* Send Directory Cache charts
*
* Send collected data to Netdata.
*/
static void ebpf_send_specific_cachestat_data(char *type, netdata_publish_cachestat_t *npc)
{
write_begin_chart(type, NETDATA_CACHESTAT_HIT_RATIO_CHART);
write_chart_dimension(cachestat_counter_publish_aggregated[NETDATA_CACHESTAT_IDX_RATIO].name, (long long)npc->ratio);
write_end_chart();
write_begin_chart(type, NETDATA_CACHESTAT_DIRTY_CHART);
write_chart_dimension(cachestat_counter_publish_aggregated[NETDATA_CACHESTAT_IDX_DIRTY].name, (long long)npc->dirty);
write_end_chart();
write_begin_chart(type, NETDATA_CACHESTAT_HIT_CHART);
write_chart_dimension(cachestat_counter_publish_aggregated[NETDATA_CACHESTAT_IDX_HIT].name, (long long)npc->hit);
write_end_chart();
write_begin_chart(type, NETDATA_CACHESTAT_MISSES_CHART);
write_chart_dimension(cachestat_counter_publish_aggregated[NETDATA_CACHESTAT_IDX_MISS].name, (long long)npc->miss);
write_end_chart();
}
/**
* Create specific cache Stat 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_cachestat_charts(char *type, int update_every)
{
ebpf_create_chart(type, NETDATA_CACHESTAT_HIT_RATIO_CHART,
"Hit is calculating using total cache added without dirties per total added because of red misses.",
EBPF_COMMON_DIMENSION_PERCENTAGE, NETDATA_CACHESTAT_CGROUP_SUBMENU,
NETDATA_CGROUP_CACHESTAT_HIT_RATIO_CONTEXT,
NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5200,
ebpf_create_global_dimension,
cachestat_counter_publish_aggregated, 1, update_every, NETDATA_EBPF_MODULE_NAME_CACHESTAT);
ebpf_create_chart(type, NETDATA_CACHESTAT_DIRTY_CHART,
"Number of dirty pages added to the page cache.",
EBPF_CACHESTAT_DIMENSION_PAGE, NETDATA_CACHESTAT_CGROUP_SUBMENU,
NETDATA_CGROUP_CACHESTAT_MODIFIED_CACHE_CONTEXT,
NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5201,
ebpf_create_global_dimension,
&cachestat_counter_publish_aggregated[NETDATA_CACHESTAT_IDX_DIRTY], 1,
update_every, NETDATA_EBPF_MODULE_NAME_CACHESTAT);
ebpf_create_chart(type, NETDATA_CACHESTAT_HIT_CHART,
"Hits are function calls that Netdata counts.",
EBPF_CACHESTAT_DIMENSION_HITS, NETDATA_CACHESTAT_CGROUP_SUBMENU,
NETDATA_CGROUP_CACHESTAT_HIT_FILES_CONTEXT,
NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5202,
ebpf_create_global_dimension,
&cachestat_counter_publish_aggregated[NETDATA_CACHESTAT_IDX_HIT], 1,
update_every, NETDATA_EBPF_MODULE_NAME_CACHESTAT);
ebpf_create_chart(type, NETDATA_CACHESTAT_MISSES_CHART,
"Misses are function calls that Netdata counts.",
EBPF_CACHESTAT_DIMENSION_MISSES, NETDATA_CACHESTAT_CGROUP_SUBMENU,
NETDATA_CGROUP_CACHESTAT_MISS_FILES_CONTEXT,
NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5203,
ebpf_create_global_dimension,
&cachestat_counter_publish_aggregated[NETDATA_CACHESTAT_IDX_MISS], 1,
update_every, NETDATA_EBPF_MODULE_NAME_CACHESTAT);
}
/**
* Obsolete specific cache stat 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_cachestat_charts(char *type, int update_every)
{
ebpf_write_chart_obsolete(type, NETDATA_CACHESTAT_HIT_RATIO_CHART,
"Hit is calculating using total cache added without dirties per total added because of red misses.",
EBPF_COMMON_DIMENSION_PERCENTAGE, NETDATA_CACHESTAT_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CGROUP_CACHESTAT_HIT_RATIO_CONTEXT,
NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5200, update_every);
ebpf_write_chart_obsolete(type, NETDATA_CACHESTAT_DIRTY_CHART,
"Number of dirty pages added to the page cache.",
EBPF_CACHESTAT_DIMENSION_PAGE, NETDATA_CACHESTAT_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CGROUP_CACHESTAT_MODIFIED_CACHE_CONTEXT,
NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5201, update_every);
ebpf_write_chart_obsolete(type, NETDATA_CACHESTAT_HIT_CHART,
"Hits are function calls that Netdata counts.",
EBPF_CACHESTAT_DIMENSION_HITS, NETDATA_CACHESTAT_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CGROUP_CACHESTAT_HIT_FILES_CONTEXT,
NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5202, update_every);
ebpf_write_chart_obsolete(type, NETDATA_CACHESTAT_MISSES_CHART,
"Misses are function calls that Netdata counts.",
EBPF_CACHESTAT_DIMENSION_MISSES, NETDATA_CACHESTAT_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CGROUP_CACHESTAT_MISS_FILES_CONTEXT,
NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5203, update_every);
}
/**
* Send data to Netdata calling auxiliar functions.
*
* @param update_every value to overwrite the update frequency set by the server.
*/
void ebpf_cachestat_send_cgroup_data(int update_every)
{
if (!ebpf_cgroup_pids)
return;
pthread_mutex_lock(&mutex_cgroup_shm);
ebpf_cgroup_target_t *ect;
ebpf_cachestat_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_cachestat_charts(update_every);
systemd_charts = 1;
}
systemd_charts = ebpf_send_systemd_cachestat_charts();
}
for (ect = ebpf_cgroup_pids; ect ; ect = ect->next) {
if (ect->systemd)
continue;
if (!(ect->flags & NETDATA_EBPF_CGROUP_HAS_CACHESTAT_CHART) && ect->updated) {
ebpf_create_specific_cachestat_charts(ect->name, update_every);
ect->flags |= NETDATA_EBPF_CGROUP_HAS_CACHESTAT_CHART;
}
if (ect->flags & NETDATA_EBPF_CGROUP_HAS_CACHESTAT_CHART) {
if (ect->updated) {
ebpf_send_specific_cachestat_data(ect->name, &ect->publish_cachestat);
} else {
ebpf_obsolete_specific_cachestat_charts(ect->name, update_every);
ect->flags &= ~NETDATA_EBPF_CGROUP_HAS_CACHESTAT_CHART;
}
}
}
pthread_mutex_unlock(&mutex_cgroup_shm);
}
/**
* Main loop for this collector.
*/
static void cachestat_collector(ebpf_module_t *em)
{
cachestat_threads.thread = mallocz(sizeof(netdata_thread_t));
cachestat_threads.start_routine = ebpf_cachestat_read_hash;
netdata_thread_create(cachestat_threads.thread, cachestat_threads.name, NETDATA_THREAD_OPTION_JOINABLE,
ebpf_cachestat_read_hash, em);
netdata_publish_cachestat_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_cachestat_cgroup();
pthread_mutex_lock(&lock);
cachestat_send_global(&publish);
if (apps)
ebpf_cache_send_apps_data(apps_groups_root_target);
if (cgroups)
ebpf_cachestat_send_cgroup_data(update_every);
pthread_mutex_unlock(&lock);
}
pthread_mutex_unlock(&collect_data_mutex);
}
}
/*****************************************************************
*
* INITIALIZE THREAD
*
*****************************************************************/
/**
* Create global charts
*
* Call ebpf_create_chart to create the charts for the collector.
*
* @param em a pointer to `struct ebpf_module`
*/
static void ebpf_create_memory_charts(ebpf_module_t *em)
{
ebpf_create_chart(NETDATA_EBPF_MEMORY_GROUP, NETDATA_CACHESTAT_HIT_RATIO_CHART,
"Hit is calculating using total cache added without dirties per total added because of red misses.",
EBPF_COMMON_DIMENSION_PERCENTAGE, NETDATA_CACHESTAT_SUBMENU,
NULL,
NETDATA_EBPF_CHART_TYPE_LINE,
21100,
ebpf_create_global_dimension,
cachestat_counter_publish_aggregated, 1, em->update_every, NETDATA_EBPF_MODULE_NAME_CACHESTAT);
ebpf_create_chart(NETDATA_EBPF_MEMORY_GROUP, NETDATA_CACHESTAT_DIRTY_CHART,
"Number of dirty pages added to the page cache.",
EBPF_CACHESTAT_DIMENSION_PAGE, NETDATA_CACHESTAT_SUBMENU,
NULL,
NETDATA_EBPF_CHART_TYPE_LINE,
21101,
ebpf_create_global_dimension,
&cachestat_counter_publish_aggregated[NETDATA_CACHESTAT_IDX_DIRTY], 1,
em->update_every, NETDATA_EBPF_MODULE_NAME_CACHESTAT);
ebpf_create_chart(NETDATA_EBPF_MEMORY_GROUP, NETDATA_CACHESTAT_HIT_CHART,
"Hits are function calls that Netdata counts.",
EBPF_CACHESTAT_DIMENSION_HITS, NETDATA_CACHESTAT_SUBMENU,
NULL,
NETDATA_EBPF_CHART_TYPE_LINE,
21102,
ebpf_create_global_dimension,
&cachestat_counter_publish_aggregated[NETDATA_CACHESTAT_IDX_HIT], 1,
em->update_every, NETDATA_EBPF_MODULE_NAME_CACHESTAT);
ebpf_create_chart(NETDATA_EBPF_MEMORY_GROUP, NETDATA_CACHESTAT_MISSES_CHART,
"Misses are function calls that Netdata counts.",
EBPF_CACHESTAT_DIMENSION_MISSES, NETDATA_CACHESTAT_SUBMENU,
NULL,
NETDATA_EBPF_CHART_TYPE_LINE,
21103,
ebpf_create_global_dimension,
&cachestat_counter_publish_aggregated[NETDATA_CACHESTAT_IDX_MISS], 1,
em->update_every, NETDATA_EBPF_MODULE_NAME_CACHESTAT);
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_cachestat_allocate_global_vectors(int apps)
{
if (apps)
cachestat_pid = callocz((size_t)pid_max, sizeof(netdata_publish_cachestat_t *));
cachestat_vector = callocz((size_t)ebpf_nprocs, sizeof(netdata_cachestat_pid_t));
cachestat_values = callocz((size_t)ebpf_nprocs, sizeof(netdata_idx_t));
memset(cachestat_hash_values, 0, NETDATA_CACHESTAT_END * sizeof(netdata_idx_t));
memset(cachestat_counter_aggregated_data, 0, NETDATA_CACHESTAT_END * sizeof(netdata_syscall_stat_t));
memset(cachestat_counter_publish_aggregated, 0, NETDATA_CACHESTAT_END * sizeof(netdata_publish_syscall_t));
}
/*****************************************************************
*
* MAIN THREAD
*
*****************************************************************/
/**
* Cachestat thread
*
* Thread used to make cachestat thread
*
* @param ptr a pointer to `struct ebpf_module`
*
* @return It always return NULL
*/
void *ebpf_cachestat_thread(void *ptr)
{
netdata_thread_cleanup_push(ebpf_cachestat_cleanup, ptr);
ebpf_module_t *em = (ebpf_module_t *)ptr;
em->maps = cachestat_maps;
ebpf_update_pid_table(&cachestat_maps[NETDATA_CACHESTAT_PID_STATS], em);
if (!em->enabled)
goto endcachestat;
pthread_mutex_lock(&lock);
ebpf_cachestat_allocate_global_vectors(em->apps_charts);
probe_links = ebpf_load_program(ebpf_plugin_dir, em, kernel_string, &objects);
if (!probe_links) {
pthread_mutex_unlock(&lock);
goto endcachestat;
}
int algorithms[NETDATA_CACHESTAT_END] = {
NETDATA_EBPF_ABSOLUTE_IDX, NETDATA_EBPF_INCREMENTAL_IDX, NETDATA_EBPF_ABSOLUTE_IDX, NETDATA_EBPF_ABSOLUTE_IDX
};
ebpf_global_labels(cachestat_counter_aggregated_data, cachestat_counter_publish_aggregated,
cachestat_counter_dimension_name, cachestat_counter_dimension_name,
algorithms, NETDATA_CACHESTAT_END);
ebpf_create_memory_charts(em);
pthread_mutex_unlock(&lock);
cachestat_collector(em);
endcachestat:
netdata_thread_cleanup_pop(1);
return NULL;
}
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