1313 lines
48 KiB
C
1313 lines
48 KiB
C
// 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 } };
|
|
|
|
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}};
|
|
|
|
#ifdef LIBBPF_MAJOR_VERSION
|
|
#include "includes/cachestat.skel.h" // BTF code
|
|
|
|
static struct cachestat_bpf *bpf_obj = NULL;
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
|
|
/*
|
|
* 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 (running_on_kernel >= NETDATA_EBPF_KERNEL_5_16) {
|
|
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 (running_on_kernel >= NETDATA_EBPF_KERNEL_5_15) {
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* 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 (running_on_kernel >= NETDATA_EBPF_KERNEL_5_16) {
|
|
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 (running_on_kernel >= NETDATA_EBPF_KERNEL_5_15) {
|
|
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 (running_on_kernel >= NETDATA_EBPF_KERNEL_5_16) {
|
|
bpf_program__set_attach_target(obj->progs.netdata_folio_mark_dirty_fentry, 0,
|
|
cachestat_targets[NETDATA_KEY_CALLS_ACCOUNT_PAGE_DIRTIED].name);
|
|
} else if (running_on_kernel >= NETDATA_EBPF_KERNEL_5_15) {
|
|
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);
|
|
}
|
|
|
|
/**
|
|
* 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 (running_on_kernel >= NETDATA_EBPF_KERNEL_5_16) {
|
|
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 (running_on_kernel >= NETDATA_EBPF_KERNEL_5_15) {
|
|
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;
|
|
|
|
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_size(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));
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
|
|
/**
|
|
* 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_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);
|
|
}
|
|
|
|
int ret = cachestat_bpf__load(obj);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
|
|
ebpf_cachestat_adjust_map_size(obj, em);
|
|
|
|
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
|
|
*
|
|
*****************************************************************/
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
#ifdef LIBBPF_MAJOR_VERSION
|
|
else if (bpf_obj)
|
|
cachestat_bpf__destroy(bpf_obj);
|
|
#endif
|
|
}
|
|
|
|
/*****************************************************************
|
|
*
|
|
* 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.
|
|
*/
|
|
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,
|
|
"Hit ratio",
|
|
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 dirty pages",
|
|
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 accessed files",
|
|
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,
|
|
"Files out of page cache",
|
|
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 auxiliary 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 ratio",
|
|
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",
|
|
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, "Number of accessed files",
|
|
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, "Files out of page cache",
|
|
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 ratio",
|
|
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",
|
|
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,
|
|
"Number of accessed files",
|
|
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,
|
|
"Files out of page cache",
|
|
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 ratio",
|
|
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",
|
|
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,
|
|
"Number of accessed files",
|
|
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,
|
|
"Files out of page cache",
|
|
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 auxiliary 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 ratio",
|
|
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",
|
|
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,
|
|
"Number of accessed files",
|
|
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,
|
|
"Files out of page cache",
|
|
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
|
|
*
|
|
*****************************************************************/
|
|
|
|
/**
|
|
* Update Internal value
|
|
*
|
|
* Update values used during runtime.
|
|
*/
|
|
static void ebpf_cachestat_set_internal_value()
|
|
{
|
|
static char *account_page[] = { "account_page_dirtied", "__set_page_dirty", "__folio_mark_dirty" };
|
|
if (running_on_kernel >= NETDATA_EBPF_KERNEL_5_16)
|
|
cachestat_targets[NETDATA_KEY_CALLS_ACCOUNT_PAGE_DIRTIED].name = account_page[NETDATA_CACHESTAT_FOLIO_DIRTY];
|
|
else if (running_on_kernel >= NETDATA_EBPF_KERNEL_5_15)
|
|
cachestat_targets[NETDATA_KEY_CALLS_ACCOUNT_PAGE_DIRTIED].name = account_page[NETDATA_CACHESTAT_SET_PAGE_DIRTY];
|
|
else
|
|
cachestat_targets[NETDATA_KEY_CALLS_ACCOUNT_PAGE_DIRTIED].name = account_page[NETDATA_CACHESTAT_ACCOUNT_PAGE_DIRTY];
|
|
}
|
|
|
|
/*
|
|
* Load BPF
|
|
*
|
|
* Load BPF files.
|
|
*
|
|
* @param em the structure with configuration
|
|
*/
|
|
static int ebpf_cachestat_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 = cachestat_bpf__open();
|
|
if (!bpf_obj)
|
|
ret = -1;
|
|
else
|
|
ret = ebpf_cachestat_load_and_attach(bpf_obj, em);
|
|
}
|
|
#endif
|
|
|
|
if (ret)
|
|
error("%s %s", EBPF_DEFAULT_ERROR_MSG, em->thread_name);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
ebpf_cachestat_set_internal_value();
|
|
|
|
#ifdef LIBBPF_MAJOR_VERSION
|
|
ebpf_adjust_thread_load(em, default_btf);
|
|
#endif
|
|
if (ebpf_cachestat_load_bpf(em)) {
|
|
em->enabled = CONFIG_BOOLEAN_NO;
|
|
goto endcachestat;
|
|
}
|
|
|
|
ebpf_cachestat_allocate_global_vectors(em->apps_charts);
|
|
|
|
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);
|
|
|
|
pthread_mutex_lock(&lock);
|
|
ebpf_update_stats(&plugin_statistics, em);
|
|
ebpf_create_memory_charts(em);
|
|
pthread_mutex_unlock(&lock);
|
|
|
|
cachestat_collector(em);
|
|
|
|
endcachestat:
|
|
if (!em->enabled)
|
|
ebpf_update_disabled_plugin_stats(em);
|
|
|
|
netdata_thread_cleanup_pop(1);
|
|
return NULL;
|
|
}
|