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ebpf_cachestat.c
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ebpf_cachestat.c
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// SPDX-License-Identifier: GPL-3.0-or-later
#include "ebpf.h"
#include "ebpf_cachestat.h"
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;
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,
#ifdef LIBBPF_MAJOR_VERSION
.map_type = BPF_MAP_TYPE_PERCPU_ARRAY
#endif
},
{.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,
#ifdef LIBBPF_MAJOR_VERSION
.map_type = BPF_MAP_TYPE_PERCPU_HASH
#endif
},
{.name = "cstat_ctrl", .internal_input = NETDATA_CONTROLLER_END,
.user_input = 0,
.type = NETDATA_EBPF_MAP_CONTROLLER,
.map_fd = ND_EBPF_MAP_FD_NOT_INITIALIZED,
#ifdef LIBBPF_MAJOR_VERSION
.map_type = BPF_MAP_TYPE_PERCPU_ARRAY
#endif
},
{.name = NULL, .internal_input = 0, .user_input = 0,
.type = NETDATA_EBPF_MAP_CONTROLLER,
.map_fd = ND_EBPF_MAP_FD_NOT_INITIALIZED,
#ifdef LIBBPF_MAJOR_VERSION
#endif
}};
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 } };
netdata_ebpf_targets_t cachestat_targets[] = { {.name = "add_to_page_cache_lru", .mode = EBPF_LOAD_TRAMPOLINE},
{.name = "mark_page_accessed", .mode = EBPF_LOAD_TRAMPOLINE},
{.name = NULL, .mode = EBPF_LOAD_TRAMPOLINE},
{.name = "mark_buffer_dirty", .mode = EBPF_LOAD_TRAMPOLINE},
{.name = NULL, .mode = EBPF_LOAD_TRAMPOLINE}};
static char *account_page[NETDATA_CACHESTAT_ACCOUNT_DIRTY_END] ={ "account_page_dirtied",
"__set_page_dirty", "__folio_mark_dirty" };
#ifdef NETDATA_DEV_MODE
int cachestat_disable_priority;
#endif
#ifdef LIBBPF_MAJOR_VERSION
/**
* Disable probe
*
* Disable all probes to use exclusively another method.
*
* @param obj is the main structure for bpf objects
*/
static void ebpf_cachestat_disable_probe(struct cachestat_bpf *obj)
{
bpf_program__set_autoload(obj->progs.netdata_add_to_page_cache_lru_kprobe, false);
bpf_program__set_autoload(obj->progs.netdata_mark_page_accessed_kprobe, false);
bpf_program__set_autoload(obj->progs.netdata_folio_mark_dirty_kprobe, false);
bpf_program__set_autoload(obj->progs.netdata_set_page_dirty_kprobe, false);
bpf_program__set_autoload(obj->progs.netdata_account_page_dirtied_kprobe, false);
bpf_program__set_autoload(obj->progs.netdata_mark_buffer_dirty_kprobe, false);
bpf_program__set_autoload(obj->progs.netdata_release_task_kprobe, false);
}
/*
* Disable specific probe
*
* Disable probes according the kernel version
*
* @param obj is the main structure for bpf objects
*/
static void ebpf_cachestat_disable_specific_probe(struct cachestat_bpf *obj)
{
if (!strcmp(cachestat_targets[NETDATA_KEY_CALLS_ACCOUNT_PAGE_DIRTIED].name,
account_page[NETDATA_CACHESTAT_FOLIO_DIRTY])) {
bpf_program__set_autoload(obj->progs.netdata_account_page_dirtied_kprobe, false);
bpf_program__set_autoload(obj->progs.netdata_set_page_dirty_kprobe, false);
} else if (!strcmp(cachestat_targets[NETDATA_KEY_CALLS_ACCOUNT_PAGE_DIRTIED].name,
account_page[NETDATA_CACHESTAT_SET_PAGE_DIRTY])) {
bpf_program__set_autoload(obj->progs.netdata_folio_mark_dirty_kprobe, false);
bpf_program__set_autoload(obj->progs.netdata_account_page_dirtied_kprobe, false);
} else {
bpf_program__set_autoload(obj->progs.netdata_folio_mark_dirty_kprobe, false);
bpf_program__set_autoload(obj->progs.netdata_set_page_dirty_kprobe, false);
}
}
/*
* Disable trampoline
*
* Disable all trampoline to use exclusively another method.
*
* @param obj is the main structure for bpf objects.
*/
static void ebpf_cachestat_disable_trampoline(struct cachestat_bpf *obj)
{
bpf_program__set_autoload(obj->progs.netdata_add_to_page_cache_lru_fentry, false);
bpf_program__set_autoload(obj->progs.netdata_mark_page_accessed_fentry, false);
bpf_program__set_autoload(obj->progs.netdata_folio_mark_dirty_fentry, false);
bpf_program__set_autoload(obj->progs.netdata_set_page_dirty_fentry, false);
bpf_program__set_autoload(obj->progs.netdata_account_page_dirtied_fentry, false);
bpf_program__set_autoload(obj->progs.netdata_mark_buffer_dirty_fentry, false);
bpf_program__set_autoload(obj->progs.netdata_release_task_fentry, false);
}
/*
* Disable specific trampoline
*
* Disable trampoline according to kernel version.
*
* @param obj is the main structure for bpf objects.
*/
static void ebpf_cachestat_disable_specific_trampoline(struct cachestat_bpf *obj)
{
if (!strcmp(cachestat_targets[NETDATA_KEY_CALLS_ACCOUNT_PAGE_DIRTIED].name,
account_page[NETDATA_CACHESTAT_FOLIO_DIRTY])) {
bpf_program__set_autoload(obj->progs.netdata_account_page_dirtied_fentry, false);
bpf_program__set_autoload(obj->progs.netdata_set_page_dirty_fentry, false);
} else if (!strcmp(cachestat_targets[NETDATA_KEY_CALLS_ACCOUNT_PAGE_DIRTIED].name,
account_page[NETDATA_CACHESTAT_SET_PAGE_DIRTY])) {
bpf_program__set_autoload(obj->progs.netdata_folio_mark_dirty_fentry, false);
bpf_program__set_autoload(obj->progs.netdata_account_page_dirtied_fentry, false);
} else {
bpf_program__set_autoload(obj->progs.netdata_folio_mark_dirty_fentry, false);
bpf_program__set_autoload(obj->progs.netdata_set_page_dirty_fentry, false);
}
}
/**
* Set trampoline target
*
* Set the targets we will monitor.
*
* @param obj is the main structure for bpf objects.
*/
static inline void netdata_set_trampoline_target(struct cachestat_bpf *obj)
{
bpf_program__set_attach_target(obj->progs.netdata_add_to_page_cache_lru_fentry, 0,
cachestat_targets[NETDATA_KEY_CALLS_ADD_TO_PAGE_CACHE_LRU].name);
bpf_program__set_attach_target(obj->progs.netdata_mark_page_accessed_fentry, 0,
cachestat_targets[NETDATA_KEY_CALLS_MARK_PAGE_ACCESSED].name);
if (!strcmp(cachestat_targets[NETDATA_KEY_CALLS_ACCOUNT_PAGE_DIRTIED].name,
account_page[NETDATA_CACHESTAT_FOLIO_DIRTY])) {
bpf_program__set_attach_target(obj->progs.netdata_folio_mark_dirty_fentry, 0,
cachestat_targets[NETDATA_KEY_CALLS_ACCOUNT_PAGE_DIRTIED].name);
} else if (!strcmp(cachestat_targets[NETDATA_KEY_CALLS_ACCOUNT_PAGE_DIRTIED].name,
account_page[NETDATA_CACHESTAT_SET_PAGE_DIRTY])) {
bpf_program__set_attach_target(obj->progs.netdata_set_page_dirty_fentry, 0,
cachestat_targets[NETDATA_KEY_CALLS_ACCOUNT_PAGE_DIRTIED].name);
} else {
bpf_program__set_attach_target(obj->progs.netdata_account_page_dirtied_fentry, 0,
cachestat_targets[NETDATA_KEY_CALLS_ACCOUNT_PAGE_DIRTIED].name);
}
bpf_program__set_attach_target(obj->progs.netdata_mark_buffer_dirty_fentry, 0,
cachestat_targets[NETDATA_KEY_CALLS_MARK_BUFFER_DIRTY].name);
bpf_program__set_attach_target(obj->progs.netdata_release_task_fentry, 0,
EBPF_COMMON_FNCT_CLEAN_UP);
}
/**
* Mount Attach Probe
*
* Attach probes to target
*
* @param obj is the main structure for bpf objects.
*
* @return It returns 0 on success and -1 otherwise.
*/
static int ebpf_cachestat_attach_probe(struct cachestat_bpf *obj)
{
obj->links.netdata_add_to_page_cache_lru_kprobe = bpf_program__attach_kprobe(obj->progs.netdata_add_to_page_cache_lru_kprobe,
false,
cachestat_targets[NETDATA_KEY_CALLS_ADD_TO_PAGE_CACHE_LRU].name);
int ret = libbpf_get_error(obj->links.netdata_add_to_page_cache_lru_kprobe);
if (ret)
return -1;
obj->links.netdata_mark_page_accessed_kprobe = bpf_program__attach_kprobe(obj->progs.netdata_mark_page_accessed_kprobe,
false,
cachestat_targets[NETDATA_KEY_CALLS_MARK_PAGE_ACCESSED].name);
ret = libbpf_get_error(obj->links.netdata_mark_page_accessed_kprobe);
if (ret)
return -1;
if (!strcmp(cachestat_targets[NETDATA_KEY_CALLS_ACCOUNT_PAGE_DIRTIED].name,
account_page[NETDATA_CACHESTAT_FOLIO_DIRTY])) {
obj->links.netdata_folio_mark_dirty_kprobe = bpf_program__attach_kprobe(obj->progs.netdata_folio_mark_dirty_kprobe,
false,
cachestat_targets[NETDATA_KEY_CALLS_ACCOUNT_PAGE_DIRTIED].name);
ret = libbpf_get_error(obj->links.netdata_folio_mark_dirty_kprobe);
} else if (!strcmp(cachestat_targets[NETDATA_KEY_CALLS_ACCOUNT_PAGE_DIRTIED].name,
account_page[NETDATA_CACHESTAT_SET_PAGE_DIRTY])) {
obj->links.netdata_set_page_dirty_kprobe = bpf_program__attach_kprobe(obj->progs.netdata_set_page_dirty_kprobe,
false,
cachestat_targets[NETDATA_KEY_CALLS_ACCOUNT_PAGE_DIRTIED].name);
ret = libbpf_get_error(obj->links.netdata_set_page_dirty_kprobe);
} else {
obj->links.netdata_account_page_dirtied_kprobe = bpf_program__attach_kprobe(obj->progs.netdata_account_page_dirtied_kprobe,
false,
cachestat_targets[NETDATA_KEY_CALLS_ACCOUNT_PAGE_DIRTIED].name);
ret = libbpf_get_error(obj->links.netdata_account_page_dirtied_kprobe);
}
if (ret)
return -1;
obj->links.netdata_mark_buffer_dirty_kprobe = bpf_program__attach_kprobe(obj->progs.netdata_mark_buffer_dirty_kprobe,
false,
cachestat_targets[NETDATA_KEY_CALLS_MARK_BUFFER_DIRTY].name);
ret = libbpf_get_error(obj->links.netdata_mark_buffer_dirty_kprobe);
if (ret)
return -1;
obj->links.netdata_release_task_kprobe = bpf_program__attach_kprobe(obj->progs.netdata_release_task_kprobe,
false,
EBPF_COMMON_FNCT_CLEAN_UP);
ret = libbpf_get_error(obj->links.netdata_release_task_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_cachestat_adjust_map(struct cachestat_bpf *obj, ebpf_module_t *em)
{
ebpf_update_map_size(obj->maps.cstat_pid, &cachestat_maps[NETDATA_CACHESTAT_PID_STATS],
em, bpf_map__name(obj->maps.cstat_pid));
ebpf_update_map_type(obj->maps.cstat_global, &cachestat_maps[NETDATA_CACHESTAT_GLOBAL_STATS]);
ebpf_update_map_type(obj->maps.cstat_pid, &cachestat_maps[NETDATA_CACHESTAT_PID_STATS]);
ebpf_update_map_type(obj->maps.cstat_ctrl, &cachestat_maps[NETDATA_CACHESTAT_CTRL]);
}
/**
* 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_cachestat_set_hash_tables(struct cachestat_bpf *obj)
{
cachestat_maps[NETDATA_CACHESTAT_GLOBAL_STATS].map_fd = bpf_map__fd(obj->maps.cstat_global);
cachestat_maps[NETDATA_CACHESTAT_PID_STATS].map_fd = bpf_map__fd(obj->maps.cstat_pid);
cachestat_maps[NETDATA_CACHESTAT_CTRL].map_fd = bpf_map__fd(obj->maps.cstat_ctrl);
}
/**
* Disable Release Task
*
* Disable release task when apps is not enabled.
*
* @param obj is the main structure for bpf objects.
*/
static void ebpf_cachestat_disable_release_task(struct cachestat_bpf *obj)
{
bpf_program__set_autoload(obj->progs.netdata_release_task_kprobe, false);
bpf_program__set_autoload(obj->progs.netdata_release_task_fentry, false);
}
/**
* Load and attach
*
* Load and attach the eBPF code in kernel.
*
* @param obj is the main structure for bpf objects.
* @param em structure with configuration
*
* @return it returns 0 on success and -1 otherwise
*/
static inline int ebpf_cachestat_load_and_attach(struct cachestat_bpf *obj, ebpf_module_t *em)
{
netdata_ebpf_targets_t *mt = em->targets;
netdata_ebpf_program_loaded_t test = mt[NETDATA_KEY_CALLS_ADD_TO_PAGE_CACHE_LRU].mode;
if (test == EBPF_LOAD_TRAMPOLINE) {
ebpf_cachestat_disable_probe(obj);
ebpf_cachestat_disable_specific_trampoline(obj);
netdata_set_trampoline_target(obj);
} else {
ebpf_cachestat_disable_trampoline(obj);
ebpf_cachestat_disable_specific_probe(obj);
}
ebpf_cachestat_adjust_map(obj, em);
if (!em->apps_charts && !em->cgroup_charts)
ebpf_cachestat_disable_release_task(obj);
int ret = cachestat_bpf__load(obj);
if (ret) {
return ret;
}
ret = (test == EBPF_LOAD_TRAMPOLINE) ? cachestat_bpf__attach(obj) : ebpf_cachestat_attach_probe(obj);
if (!ret) {
ebpf_cachestat_set_hash_tables(obj);
ebpf_update_controller(cachestat_maps[NETDATA_CACHESTAT_CTRL].map_fd, em);
}
return ret;
}
#endif
/*****************************************************************
*
* FUNCTIONS TO CLOSE THE THREAD
*
*****************************************************************/
static void ebpf_obsolete_specific_cachestat_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_services(ebpf_module_t *em)
{
ebpf_write_chart_obsolete(NETDATA_SERVICE_FAMILY,
NETDATA_CACHESTAT_HIT_RATIO_CHART,
"",
"Hit ratio",
EBPF_COMMON_DIMENSION_PERCENTAGE,
NETDATA_CACHESTAT_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE,
NETDATA_SYSTEMD_CACHESTAT_HIT_RATIO_CONTEXT,
21100,
em->update_every);
ebpf_write_chart_obsolete(NETDATA_SERVICE_FAMILY,
NETDATA_CACHESTAT_DIRTY_CHART,
"",
"Number of dirty pages",
EBPF_CACHESTAT_DIMENSION_PAGE,
NETDATA_CACHESTAT_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE,
NETDATA_SYSTEMD_CACHESTAT_MODIFIED_CACHE_CONTEXT,
21101,
em->update_every);
ebpf_write_chart_obsolete(NETDATA_SERVICE_FAMILY,
NETDATA_CACHESTAT_HIT_CHART,
"",
"Number of accessed files",
EBPF_CACHESTAT_DIMENSION_HITS,
NETDATA_CACHESTAT_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE,
NETDATA_SYSTEMD_CACHESTAT_HIT_FILE_CONTEXT,
21102,
em->update_every);
ebpf_write_chart_obsolete(NETDATA_SERVICE_FAMILY,
NETDATA_CACHESTAT_MISSES_CHART,
"",
"Files out of page cache",
EBPF_CACHESTAT_DIMENSION_MISSES,
NETDATA_CACHESTAT_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE,
NETDATA_SYSTEMD_CACHESTAT_MISS_FILES_CONTEXT,
21103,
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_cachestat_cgroup_charts(ebpf_module_t *em) {
pthread_mutex_lock(&mutex_cgroup_shm);
ebpf_obsolete_services(em);
ebpf_cgroup_target_t *ect;
for (ect = ebpf_cgroup_pids; ect ; ect = ect->next) {
if (ect->systemd)
continue;
ebpf_obsolete_specific_cachestat_charts(ect->name, em->update_every);
}
pthread_mutex_unlock(&mutex_cgroup_shm);
}
/**
* Obsolete global
*
* Obsolete global charts created by thread.
*
* @param em a pointer to `struct ebpf_module`
*/
static void ebpf_obsolete_cachestat_global(ebpf_module_t *em)
{
ebpf_write_chart_obsolete(NETDATA_EBPF_MEMORY_GROUP,
NETDATA_CACHESTAT_HIT_RATIO_CHART,
"",
"Hit ratio",
EBPF_COMMON_DIMENSION_PERCENTAGE,
NETDATA_CACHESTAT_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE,
NULL,
21100,
em->update_every);
ebpf_write_chart_obsolete(NETDATA_EBPF_MEMORY_GROUP,
NETDATA_CACHESTAT_DIRTY_CHART,
"",
"Number of dirty pages",
EBPF_CACHESTAT_DIMENSION_PAGE,
NETDATA_CACHESTAT_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE,
NULL,
21101,
em->update_every);
ebpf_write_chart_obsolete(NETDATA_EBPF_MEMORY_GROUP,
NETDATA_CACHESTAT_HIT_CHART,
"",
"Number of accessed files",
EBPF_CACHESTAT_DIMENSION_HITS,
NETDATA_CACHESTAT_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE,
NULL,
21102,
em->update_every);
ebpf_write_chart_obsolete(NETDATA_EBPF_MEMORY_GROUP,
NETDATA_CACHESTAT_MISSES_CHART,
"",
"Files out of page cache",
EBPF_CACHESTAT_DIMENSION_MISSES,
NETDATA_CACHESTAT_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE,
NULL,
21103,
em->update_every);
}
/**
* Obsolette apps charts
*
* Obsolete apps charts.
*
* @param em a pointer to the structure with the default values.
*/
void ebpf_obsolete_cachestat_apps_charts(struct ebpf_module *em)
{
struct ebpf_target *w;
int update_every = em->update_every;
for (w = apps_groups_root_target; w; w = w->next) {
if (unlikely(!(w->charts_created & (1<<EBPF_MODULE_CACHESTAT_IDX))))
continue;
ebpf_write_chart_obsolete(NETDATA_APP_FAMILY,
w->clean_name,
"_ebpf_cachestat_hit_ratio",
"Hit ratio",
EBPF_COMMON_DIMENSION_PERCENTAGE,
NETDATA_CACHESTAT_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE,
"app.ebpf_cachestat_hit_ratio",
20260,
update_every);
ebpf_write_chart_obsolete(NETDATA_APP_FAMILY,
w->clean_name,
"_ebpf_cachestat_dirty_pages",
"Number of dirty pages",
EBPF_CACHESTAT_DIMENSION_PAGE,
NETDATA_CACHESTAT_SUBMENU,
NETDATA_EBPF_CHART_TYPE_STACKED,
"app.ebpf_cachestat_dirty_pages",
20261,
update_every);
ebpf_write_chart_obsolete(NETDATA_APP_FAMILY,
w->clean_name,
"_ebpf_cachestat_access",
"Number of accessed files",
EBPF_CACHESTAT_DIMENSION_HITS,
NETDATA_CACHESTAT_SUBMENU,
NETDATA_EBPF_CHART_TYPE_STACKED,
"app.ebpf_cachestat_access",
20262,
update_every);
ebpf_write_chart_obsolete(NETDATA_APP_FAMILY,
w->clean_name,
"_ebpf_cachestat_misses",
"Files out of page cache",
EBPF_CACHESTAT_DIMENSION_MISSES,
NETDATA_CACHESTAT_SUBMENU,
NETDATA_EBPF_CHART_TYPE_STACKED,
"app.ebpf_cachestat_misses",
20263,
update_every);
w->charts_created &= ~(1<<EBPF_MODULE_CACHESTAT_IDX);
}
}
/**
* Cachestat exit.
*
* Cancel child and exit.
*
* @param ptr thread data.
*/
static void ebpf_cachestat_exit(void *ptr)
{
ebpf_module_t *em = (ebpf_module_t *)ptr;
if (em->enabled == NETDATA_THREAD_EBPF_FUNCTION_RUNNING) {
pthread_mutex_lock(&lock);
if (em->cgroup_charts) {
ebpf_obsolete_cachestat_cgroup_charts(em);
fflush(stdout);
}
if (em->apps_charts & NETDATA_EBPF_APPS_FLAG_CHART_CREATED) {
ebpf_obsolete_cachestat_apps_charts(em);
}
ebpf_obsolete_cachestat_global(em);
#ifdef NETDATA_DEV_MODE
if (ebpf_aral_cachestat_pid)
ebpf_statistic_obsolete_aral_chart(em, cachestat_disable_priority);
#endif
fflush(stdout);
pthread_mutex_unlock(&lock);
}
ebpf_update_kernel_memory_with_vector(&plugin_statistics, em->maps, EBPF_ACTION_STAT_REMOVE);
#ifdef LIBBPF_MAJOR_VERSION
if (cachestat_bpf_obj) {
cachestat_bpf__destroy(cachestat_bpf_obj);
cachestat_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);
}
/*****************************************************************
*
* COMMON FUNCTIONS
*
*****************************************************************/
/**
* Update publish
*
* Update publish values before to write dimension.
*
* @param out structure 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
NETDATA_DOUBLE total = (NETDATA_DOUBLE) (((long long)mpa) - ((long long)mbd));
if (total < 0)
total = 0;
NETDATA_DOUBLE misses = (NETDATA_DOUBLE) ( ((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.
NETDATA_DOUBLE hits = total - misses;
if (hits < 0 ) {
misses = total;
hits = 0;
}
NETDATA_DOUBLE 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.
* @param maps_per_core do I need to read all cores?
*/
static void cachestat_apps_accumulator(netdata_cachestat_pid_t *out, int maps_per_core)
{
int i, end = (maps_per_core) ? 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 = ebpf_publish_cachestat_get();
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.
*
* @param maps_per_core do I need to read all cores?
*/
static void ebpf_read_cachestat_apps_table(int maps_per_core)
{
netdata_cachestat_pid_t *cv = cachestat_vector;
uint32_t key;
struct ebpf_pid_stat *pids = ebpf_root_of_pids;
int fd = cachestat_maps[NETDATA_CACHESTAT_PID_STATS].map_fd;
size_t length = sizeof(netdata_cachestat_pid_t);
if (maps_per_core)
length *= ebpf_nprocs;
while (pids) {
key = pids->pid;
if (bpf_map_lookup_elem(fd, &key, cv)) {
pids = pids->next;
continue;
}
cachestat_apps_accumulator(cv, maps_per_core);
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
*
* @param maps_per_core do I need to read all cores?
*/
static void ebpf_update_cachestat_cgroup(int maps_per_core)
{
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);
if (maps_per_core)
length *= 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, maps_per_core);
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 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_cachestat_hit_ratio",
"Hit ratio",
EBPF_COMMON_DIMENSION_PERCENTAGE,
NETDATA_CACHESTAT_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE,
"app.ebpf_cachestat_hit_ratio",
20260,
update_every,
NETDATA_EBPF_MODULE_NAME_CACHESTAT);
ebpf_create_chart_labels("app_group", w->name, 1);
ebpf_commit_label();
fprintf(stdout, "DIMENSION ratio '' %s 1 1\n", ebpf_algorithms[NETDATA_EBPF_ABSOLUTE_IDX]);
ebpf_write_chart_cmd(NETDATA_APP_FAMILY,
w->clean_name,
"_ebpf_cachestat_dirty_pages",
"Number of dirty pages",
EBPF_CACHESTAT_DIMENSION_PAGE,
NETDATA_CACHESTAT_SUBMENU,
NETDATA_EBPF_CHART_TYPE_LINE,
"app.ebpf_cachestat_dirty_pages",
20261,
update_every,
NETDATA_EBPF_MODULE_NAME_CACHESTAT);
ebpf_create_chart_labels("app_group", w->name, 1);
ebpf_commit_label();
fprintf(stdout, "DIMENSION pages '' %s 1 1\n", ebpf_algorithms[NETDATA_EBPF_INCREMENTAL_IDX]);
ebpf_write_chart_cmd(NETDATA_APP_FAMILY,
w->clean_name,
"_ebpf_cachestat_access",
"Number of accessed files",
EBPF_CACHESTAT_DIMENSION_HITS,
NETDATA_CACHESTAT_SUBMENU,
NETDATA_EBPF_CHART_TYPE_STACKED,
"app.ebpf_cachestat_access",
20262,
update_every,
NETDATA_EBPF_MODULE_NAME_CACHESTAT);
ebpf_create_chart_labels("app_group", w->name, 1);
ebpf_commit_label();
fprintf(stdout, "DIMENSION hits '' %s 1 1\n", ebpf_algorithms[NETDATA_EBPF_ABSOLUTE_IDX]);
ebpf_write_chart_cmd(NETDATA_APP_FAMILY,
w->clean_name,
"_ebpf_cachestat_misses",
"Files out of page cache",
EBPF_CACHESTAT_DIMENSION_MISSES,
NETDATA_CACHESTAT_SUBMENU,
NETDATA_EBPF_CHART_TYPE_STACKED,
"app.ebpf_cachestat_misses",
20263,
update_every,
NETDATA_EBPF_MODULE_NAME_CACHESTAT);
ebpf_create_chart_labels("app_group", w->name, 1);
ebpf_commit_label();
fprintf(stdout, "DIMENSION misses '' %s 1 1\n", ebpf_algorithms[NETDATA_EBPF_ABSOLUTE_IDX]);
w->charts_created |= 1<<EBPF_MODULE_CACHESTAT_IDX;
}
em->apps_charts |= NETDATA_EBPF_APPS_FLAG_CHART_CREATED;
}
/*****************************************************************
*
* MAIN LOOP
*
*****************************************************************/
/**
* Read global counter
*
* Read the table with number of calls for all functions
*
* @param stats vector used to read data from control table.
* @param maps_per_core do I need to read all cores?
*/
static void ebpf_cachestat_read_global_tables(netdata_idx_t *stats, int maps_per_core)
{
ebpf_read_global_table_stats(cachestat_hash_values,
cachestat_values,
cachestat_maps[NETDATA_CACHESTAT_GLOBAL_STATS].map_fd,
maps_per_core,
NETDATA_KEY_CALLS_ADD_TO_PAGE_CACHE_LRU,
NETDATA_CACHESTAT_END);
ebpf_read_global_table_stats(stats,
cachestat_values,
cachestat_maps[NETDATA_CACHESTAT_CTRL].map_fd,
maps_per_core,
NETDATA_CONTROLLER_PID_TABLE_ADD,
NETDATA_CONTROLLER_END);
}
/**
* 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 ebpf_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 auxiliary functions.
*
* @param root the target list.
*/
void ebpf_cache_send_apps_data(struct ebpf_target *root)
{
struct ebpf_target *w;
collected_number value;
for (w = root; w; w = w->next) {
if (unlikely(!(w->charts_created & (1<<EBPF_MODULE_CACHESTAT_IDX))))
continue;
ebpf_cachestat_sum_pids(&w->cachestat, w->root_pid);