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sys_fs_cgroup.c
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sys_fs_cgroup.c
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#include "common.h"
// ----------------------------------------------------------------------------
// cgroup globals
static int cgroup_enable_cpuacct_stat = CONFIG_ONDEMAND_ONDEMAND;
static int cgroup_enable_cpuacct_usage = CONFIG_ONDEMAND_ONDEMAND;
static int cgroup_enable_memory = CONFIG_ONDEMAND_ONDEMAND;
static int cgroup_enable_devices = CONFIG_ONDEMAND_ONDEMAND;
static int cgroup_enable_blkio = CONFIG_ONDEMAND_ONDEMAND;
static int cgroup_enable_new_cgroups_detected_at_runtime = 1;
static int cgroup_check_for_new_every = 10;
static char *cgroup_cpuacct_base = NULL;
static char *cgroup_blkio_base = NULL;
static char *cgroup_memory_base = NULL;
static char *cgroup_devices_base = NULL;
static int cgroup_root_count = 0;
static int cgroup_root_max = 500;
static int cgroup_max_depth = 0;
void read_cgroup_plugin_configuration() {
cgroup_check_for_new_every = config_get_number("plugin:cgroups", "check for new cgroups every", cgroup_check_for_new_every);
cgroup_enable_cpuacct_stat = config_get_boolean_ondemand("plugin:cgroups", "enable cpuacct stat", cgroup_enable_cpuacct_stat);
cgroup_enable_cpuacct_usage = config_get_boolean_ondemand("plugin:cgroups", "enable cpuacct usage", cgroup_enable_cpuacct_usage);
cgroup_enable_memory = config_get_boolean_ondemand("plugin:cgroups", "enable memory", cgroup_enable_memory);
cgroup_enable_blkio = config_get_boolean_ondemand("plugin:cgroups", "enable blkio", cgroup_enable_blkio);
char filename[FILENAME_MAX + 1], *s;
struct mountinfo *mi, *root = mountinfo_read();
mi = mountinfo_find_by_filesystem_super_option(root, "cgroup", "cpuacct");
if(!mi) mi = mountinfo_find_by_filesystem_mount_source(root, "cgroup", "cpuacct");
if(!mi) {
error("Cannot find cgroup cpuacct mountinfo. Assuming default: /sys/fs/cgroup/cpuacct");
s = "/sys/fs/cgroup/cpuacct";
}
else s = mi->mount_point;
snprintfz(filename, FILENAME_MAX, "%s%s", global_host_prefix, s);
cgroup_cpuacct_base = config_get("plugin:cgroups", "path to /sys/fs/cgroup/cpuacct", filename);
mi = mountinfo_find_by_filesystem_super_option(root, "cgroup", "blkio");
if(!mi) mi = mountinfo_find_by_filesystem_mount_source(root, "cgroup", "blkio");
if(!mi) {
error("Cannot find cgroup blkio mountinfo. Assuming default: /sys/fs/cgroup/blkio");
s = "/sys/fs/cgroup/blkio";
}
else s = mi->mount_point;
snprintfz(filename, FILENAME_MAX, "%s%s", global_host_prefix, s);
cgroup_blkio_base = config_get("plugin:cgroups", "path to /sys/fs/cgroup/blkio", filename);
mi = mountinfo_find_by_filesystem_super_option(root, "cgroup", "memory");
if(!mi) mi = mountinfo_find_by_filesystem_mount_source(root, "cgroup", "memory");
if(!mi) {
error("Cannot find cgroup memory mountinfo. Assuming default: /sys/fs/cgroup/memory");
s = "/sys/fs/cgroup/memory";
}
else s = mi->mount_point;
snprintfz(filename, FILENAME_MAX, "%s%s", global_host_prefix, s);
cgroup_memory_base = config_get("plugin:cgroups", "path to /sys/fs/cgroup/memory", filename);
mi = mountinfo_find_by_filesystem_super_option(root, "cgroup", "devices");
if(!mi) mi = mountinfo_find_by_filesystem_mount_source(root, "cgroup", "devices");
if(!mi) {
error("Cannot find cgroup devices mountinfo. Assuming default: /sys/fs/cgroup/devices");
s = "/sys/fs/cgroup/devices";
}
else s = mi->mount_point;
snprintfz(filename, FILENAME_MAX, "%s%s", global_host_prefix, s);
cgroup_devices_base = config_get("plugin:cgroups", "path to /sys/fs/cgroup/devices", filename);
cgroup_root_max = config_get_number("plugin:cgroups", "max cgroups to allow", cgroup_root_max);
cgroup_max_depth = config_get_number("plugin:cgroups", "max cgroups depth to monitor", cgroup_max_depth);
cgroup_enable_new_cgroups_detected_at_runtime = config_get_boolean("plugin:cgroups", "enable new cgroups detected at run time", cgroup_enable_new_cgroups_detected_at_runtime);
mountinfo_free(root);
}
// ----------------------------------------------------------------------------
// cgroup objects
struct blkio {
int updated;
char *filename;
unsigned long long Read;
unsigned long long Write;
/*
unsigned long long Sync;
unsigned long long Async;
unsigned long long Total;
*/
};
// https://www.kernel.org/doc/Documentation/cgroup-v1/memory.txt
struct memory {
int updated;
char *filename;
int has_dirty_swap;
unsigned long long cache;
unsigned long long rss;
unsigned long long rss_huge;
unsigned long long mapped_file;
unsigned long long writeback;
unsigned long long dirty;
unsigned long long swap;
unsigned long long pgpgin;
unsigned long long pgpgout;
unsigned long long pgfault;
unsigned long long pgmajfault;
/*
unsigned long long inactive_anon;
unsigned long long active_anon;
unsigned long long inactive_file;
unsigned long long active_file;
unsigned long long unevictable;
unsigned long long hierarchical_memory_limit;
unsigned long long total_cache;
unsigned long long total_rss;
unsigned long long total_rss_huge;
unsigned long long total_mapped_file;
unsigned long long total_writeback;
unsigned long long total_dirty;
unsigned long long total_swap;
unsigned long long total_pgpgin;
unsigned long long total_pgpgout;
unsigned long long total_pgfault;
unsigned long long total_pgmajfault;
unsigned long long total_inactive_anon;
unsigned long long total_active_anon;
unsigned long long total_inactive_file;
unsigned long long total_active_file;
unsigned long long total_unevictable;
*/
int usage_in_bytes_updated;
char *filename_usage_in_bytes;
unsigned long long usage_in_bytes;
int msw_usage_in_bytes_updated;
char *filename_msw_usage_in_bytes;
unsigned long long msw_usage_in_bytes;
int failcnt_updated;
char *filename_failcnt;
unsigned long long failcnt;
};
// https://www.kernel.org/doc/Documentation/cgroup-v1/cpuacct.txt
struct cpuacct_stat {
int updated;
char *filename;
unsigned long long user;
unsigned long long system;
};
// https://www.kernel.org/doc/Documentation/cgroup-v1/cpuacct.txt
struct cpuacct_usage {
int updated;
char *filename;
unsigned int cpus;
unsigned long long *cpu_percpu;
};
#define CGROUP_OPTIONS_DISABLED_DUPLICATE 0x00000001
struct cgroup {
uint32_t options;
char available; // found in the filesystem
char enabled; // enabled in the config
char *id;
uint32_t hash;
char *chart_id;
uint32_t hash_chart;
char *chart_title;
struct cpuacct_stat cpuacct_stat;
struct cpuacct_usage cpuacct_usage;
struct memory memory;
struct blkio io_service_bytes; // bytes
struct blkio io_serviced; // operations
struct blkio throttle_io_service_bytes; // bytes
struct blkio throttle_io_serviced; // operations
struct blkio io_merged; // operations
struct blkio io_queued; // operations
struct cgroup *next;
} *cgroup_root = NULL;
// ----------------------------------------------------------------------------
// read values from /sys
void cgroup_read_cpuacct_stat(struct cpuacct_stat *cp) {
static procfile *ff = NULL;
static uint32_t user_hash = 0;
static uint32_t system_hash = 0;
if(unlikely(user_hash == 0)) {
user_hash = simple_hash("user");
system_hash = simple_hash("system");
}
cp->updated = 0;
if(cp->filename) {
ff = procfile_reopen(ff, cp->filename, NULL, PROCFILE_FLAG_DEFAULT);
if(!ff) return;
ff = procfile_readall(ff);
if(!ff) return;
unsigned long i, lines = procfile_lines(ff);
if(lines < 1) {
error("File '%s' should have 1+ lines.", cp->filename);
return;
}
for(i = 0; i < lines ; i++) {
char *s = procfile_lineword(ff, i, 0);
uint32_t hash = simple_hash(s);
if(hash == user_hash && !strcmp(s, "user"))
cp->user = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == system_hash && !strcmp(s, "system"))
cp->system = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
}
cp->updated = 1;
// fprintf(stderr, "READ '%s': user: %llu, system: %llu\n", cp->filename, cp->user, cp->system);
}
}
void cgroup_read_cpuacct_usage(struct cpuacct_usage *ca) {
static procfile *ff = NULL;
ca->updated = 0;
if(ca->filename) {
ff = procfile_reopen(ff, ca->filename, NULL, PROCFILE_FLAG_DEFAULT);
if(!ff) return;
ff = procfile_readall(ff);
if(!ff) return;
if(procfile_lines(ff) < 1) {
error("File '%s' should have 1+ lines but has %u.", ca->filename, procfile_lines(ff));
return;
}
unsigned long i = procfile_linewords(ff, 0);
if(i <= 0) return;
// we may have 1 more CPU reported
while(i > 0) {
char *s = procfile_lineword(ff, 0, i - 1);
if(!*s) i--;
else break;
}
if(i != ca->cpus) {
freez(ca->cpu_percpu);
ca->cpu_percpu = mallocz(sizeof(unsigned long long) * i);
ca->cpus = (unsigned int)i;
}
for(i = 0; i < ca->cpus ;i++) {
ca->cpu_percpu[i] = strtoull(procfile_lineword(ff, 0, i), NULL, 10);
// fprintf(stderr, "READ '%s': cpu%d/%d: %llu ('%s')\n", ca->filename, i, ca->cpus, ca->cpu_percpu[i], procfile_lineword(ff, 0, i));
}
ca->updated = 1;
}
}
void cgroup_read_blkio(struct blkio *io) {
static procfile *ff = NULL;
static uint32_t Read_hash = 0;
static uint32_t Write_hash = 0;
/*
static uint32_t Sync_hash = 0;
static uint32_t Async_hash = 0;
static uint32_t Total_hash = 0;
*/
if(unlikely(Read_hash == 0)) {
Read_hash = simple_hash("Read");
Write_hash = simple_hash("Write");
/*
Sync_hash = simple_hash("Sync");
Async_hash = simple_hash("Async");
Total_hash = simple_hash("Total");
*/
}
io->updated = 0;
if(io->filename) {
ff = procfile_reopen(ff, io->filename, NULL, PROCFILE_FLAG_DEFAULT);
if(!ff) return;
ff = procfile_readall(ff);
if(!ff) return;
unsigned long i, lines = procfile_lines(ff);
if(lines < 1) {
error("File '%s' should have 1+ lines.", io->filename);
return;
}
io->Read = 0;
io->Write = 0;
/*
io->Sync = 0;
io->Async = 0;
io->Total = 0;
*/
for(i = 0; i < lines ; i++) {
char *s = procfile_lineword(ff, i, 1);
uint32_t hash = simple_hash(s);
if(hash == Read_hash && !strcmp(s, "Read"))
io->Read += strtoull(procfile_lineword(ff, i, 2), NULL, 10);
else if(hash == Write_hash && !strcmp(s, "Write"))
io->Write += strtoull(procfile_lineword(ff, i, 2), NULL, 10);
/*
else if(hash == Sync_hash && !strcmp(s, "Sync"))
io->Sync += strtoull(procfile_lineword(ff, i, 2), NULL, 10);
else if(hash == Async_hash && !strcmp(s, "Async"))
io->Async += strtoull(procfile_lineword(ff, i, 2), NULL, 10);
else if(hash == Total_hash && !strcmp(s, "Total"))
io->Total += strtoull(procfile_lineword(ff, i, 2), NULL, 10);
*/
}
io->updated = 1;
// fprintf(stderr, "READ '%s': Read: %llu, Write: %llu, Sync: %llu, Async: %llu, Total: %llu\n", io->filename, io->Read, io->Write, io->Sync, io->Async, io->Total);
}
}
void cgroup_read_memory(struct memory *mem) {
static procfile *ff = NULL;
static uint32_t cache_hash = 0;
static uint32_t rss_hash = 0;
static uint32_t rss_huge_hash = 0;
static uint32_t mapped_file_hash = 0;
static uint32_t writeback_hash = 0;
static uint32_t dirty_hash = 0;
static uint32_t swap_hash = 0;
static uint32_t pgpgin_hash = 0;
static uint32_t pgpgout_hash = 0;
static uint32_t pgfault_hash = 0;
static uint32_t pgmajfault_hash = 0;
/*
static uint32_t inactive_anon_hash = 0;
static uint32_t active_anon_hash = 0;
static uint32_t inactive_file_hash = 0;
static uint32_t active_file_hash = 0;
static uint32_t unevictable_hash = 0;
static uint32_t hierarchical_memory_limit_hash = 0;
static uint32_t total_cache_hash = 0;
static uint32_t total_rss_hash = 0;
static uint32_t total_rss_huge_hash = 0;
static uint32_t total_mapped_file_hash = 0;
static uint32_t total_writeback_hash = 0;
static uint32_t total_dirty_hash = 0;
static uint32_t total_swap_hash = 0;
static uint32_t total_pgpgin_hash = 0;
static uint32_t total_pgpgout_hash = 0;
static uint32_t total_pgfault_hash = 0;
static uint32_t total_pgmajfault_hash = 0;
static uint32_t total_inactive_anon_hash = 0;
static uint32_t total_active_anon_hash = 0;
static uint32_t total_inactive_file_hash = 0;
static uint32_t total_active_file_hash = 0;
static uint32_t total_unevictable_hash = 0;
*/
if(unlikely(cache_hash == 0)) {
cache_hash = simple_hash("cache");
rss_hash = simple_hash("rss");
rss_huge_hash = simple_hash("rss_huge");
mapped_file_hash = simple_hash("mapped_file");
writeback_hash = simple_hash("writeback");
dirty_hash = simple_hash("dirty");
swap_hash = simple_hash("swap");
pgpgin_hash = simple_hash("pgpgin");
pgpgout_hash = simple_hash("pgpgout");
pgfault_hash = simple_hash("pgfault");
pgmajfault_hash = simple_hash("pgmajfault");
/*
inactive_anon_hash = simple_hash("inactive_anon");
active_anon_hash = simple_hash("active_anon");
inactive_file_hash = simple_hash("inactive_file");
active_file_hash = simple_hash("active_file");
unevictable_hash = simple_hash("unevictable");
hierarchical_memory_limit_hash = simple_hash("hierarchical_memory_limit");
total_cache_hash = simple_hash("total_cache");
total_rss_hash = simple_hash("total_rss");
total_rss_huge_hash = simple_hash("total_rss_huge");
total_mapped_file_hash = simple_hash("total_mapped_file");
total_writeback_hash = simple_hash("total_writeback");
total_dirty_hash = simple_hash("total_dirty");
total_swap_hash = simple_hash("total_swap");
total_pgpgin_hash = simple_hash("total_pgpgin");
total_pgpgout_hash = simple_hash("total_pgpgout");
total_pgfault_hash = simple_hash("total_pgfault");
total_pgmajfault_hash = simple_hash("total_pgmajfault");
total_inactive_anon_hash = simple_hash("total_inactive_anon");
total_active_anon_hash = simple_hash("total_active_anon");
total_inactive_file_hash = simple_hash("total_inactive_file");
total_active_file_hash = simple_hash("total_active_file");
total_unevictable_hash = simple_hash("total_unevictable");
*/
}
mem->updated = 0;
if(mem->filename) {
ff = procfile_reopen(ff, mem->filename, NULL, PROCFILE_FLAG_DEFAULT);
if(!ff) return;
ff = procfile_readall(ff);
if(!ff) return;
unsigned long i, lines = procfile_lines(ff);
if(lines < 1) {
error("File '%s' should have 1+ lines.", mem->filename);
return;
}
for(i = 0; i < lines ; i++) {
char *s = procfile_lineword(ff, i, 0);
uint32_t hash = simple_hash(s);
if(hash == cache_hash && !strcmp(s, "cache"))
mem->cache = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == rss_hash && !strcmp(s, "rss"))
mem->rss = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == rss_huge_hash && !strcmp(s, "rss_huge"))
mem->rss_huge = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == mapped_file_hash && !strcmp(s, "mapped_file"))
mem->mapped_file = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == writeback_hash && !strcmp(s, "writeback"))
mem->writeback = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == dirty_hash && !strcmp(s, "dirty")) {
mem->dirty = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
mem->has_dirty_swap = 1;
}
else if(hash == swap_hash && !strcmp(s, "swap")) {
mem->swap = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
mem->has_dirty_swap = 1;
}
else if(hash == pgpgin_hash && !strcmp(s, "pgpgin"))
mem->pgpgin = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == pgpgout_hash && !strcmp(s, "pgpgout"))
mem->pgpgout = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == pgfault_hash && !strcmp(s, "pgfault"))
mem->pgfault = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == pgmajfault_hash && !strcmp(s, "pgmajfault"))
mem->pgmajfault = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
/*
else if(hash == inactive_anon_hash && !strcmp(s, "inactive_anon"))
mem->inactive_anon = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == active_anon_hash && !strcmp(s, "active_anon"))
mem->active_anon = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == inactive_file_hash && !strcmp(s, "inactive_file"))
mem->inactive_file = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == active_file_hash && !strcmp(s, "active_file"))
mem->active_file = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == unevictable_hash && !strcmp(s, "unevictable"))
mem->unevictable = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == hierarchical_memory_limit_hash && !strcmp(s, "hierarchical_memory_limit"))
mem->hierarchical_memory_limit = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == total_cache_hash && !strcmp(s, "total_cache"))
mem->total_cache = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == total_rss_hash && !strcmp(s, "total_rss"))
mem->total_rss = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == total_rss_huge_hash && !strcmp(s, "total_rss_huge"))
mem->total_rss_huge = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == total_mapped_file_hash && !strcmp(s, "total_mapped_file"))
mem->total_mapped_file = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == total_writeback_hash && !strcmp(s, "total_writeback"))
mem->total_writeback = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == total_dirty_hash && !strcmp(s, "total_dirty"))
mem->total_dirty = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == total_swap_hash && !strcmp(s, "total_swap"))
mem->total_swap = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == total_pgpgin_hash && !strcmp(s, "total_pgpgin"))
mem->total_pgpgin = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == total_pgpgout_hash && !strcmp(s, "total_pgpgout"))
mem->total_pgpgout = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == total_pgfault_hash && !strcmp(s, "total_pgfault"))
mem->total_pgfault = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == total_pgmajfault_hash && !strcmp(s, "total_pgmajfault"))
mem->total_pgmajfault = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == total_inactive_anon_hash && !strcmp(s, "total_inactive_anon"))
mem->total_inactive_anon = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == total_active_anon_hash && !strcmp(s, "total_active_anon"))
mem->total_active_anon = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == total_inactive_file_hash && !strcmp(s, "total_inactive_file"))
mem->total_inactive_file = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == total_active_file_hash && !strcmp(s, "total_active_file"))
mem->total_active_file = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
else if(hash == total_unevictable_hash && !strcmp(s, "total_unevictable"))
mem->total_unevictable = strtoull(procfile_lineword(ff, i, 1), NULL, 10);
*/
}
// fprintf(stderr, "READ: '%s', cache: %llu, rss: %llu, rss_huge: %llu, mapped_file: %llu, writeback: %llu, dirty: %llu, swap: %llu, pgpgin: %llu, pgpgout: %llu, pgfault: %llu, pgmajfault: %llu, inactive_anon: %llu, active_anon: %llu, inactive_file: %llu, active_file: %llu, unevictable: %llu, hierarchical_memory_limit: %llu, total_cache: %llu, total_rss: %llu, total_rss_huge: %llu, total_mapped_file: %llu, total_writeback: %llu, total_dirty: %llu, total_swap: %llu, total_pgpgin: %llu, total_pgpgout: %llu, total_pgfault: %llu, total_pgmajfault: %llu, total_inactive_anon: %llu, total_active_anon: %llu, total_inactive_file: %llu, total_active_file: %llu, total_unevictable: %llu\n", mem->filename, mem->cache, mem->rss, mem->rss_huge, mem->mapped_file, mem->writeback, mem->dirty, mem->swap, mem->pgpgin, mem->pgpgout, mem->pgfault, mem->pgmajfault, mem->inactive_anon, mem->active_anon, mem->inactive_file, mem->active_file, mem->unevictable, mem->hierarchical_memory_limit, mem->total_cache, mem->total_rss, mem->total_rss_huge, mem->total_mapped_file, mem->total_writeback, mem->total_dirty, mem->total_swap, mem->total_pgpgin, mem->total_pgpgout, mem->total_pgfault, mem->total_pgmajfault, mem->total_inactive_anon, mem->total_active_anon, mem->total_inactive_file, mem->total_active_file, mem->total_unevictable);
mem->updated = 1;
}
mem->usage_in_bytes_updated = 0;
if(mem->filename_usage_in_bytes) {
if(likely(!read_single_number_file(mem->filename_usage_in_bytes, &mem->usage_in_bytes)))
mem->usage_in_bytes_updated = 1;
}
mem->msw_usage_in_bytes_updated = 0;
if(mem->filename_msw_usage_in_bytes) {
if(likely(!read_single_number_file(mem->filename_msw_usage_in_bytes, &mem->msw_usage_in_bytes)))
mem->msw_usage_in_bytes_updated = 1;
}
mem->failcnt_updated = 0;
if(mem->filename_failcnt) {
if(likely(!read_single_number_file(mem->filename_failcnt, &mem->failcnt)))
mem->failcnt_updated = 1;
}
}
void cgroup_read(struct cgroup *cg) {
debug(D_CGROUP, "reading metrics for cgroups '%s'", cg->id);
cgroup_read_cpuacct_stat(&cg->cpuacct_stat);
cgroup_read_cpuacct_usage(&cg->cpuacct_usage);
cgroup_read_memory(&cg->memory);
cgroup_read_blkio(&cg->io_service_bytes);
cgroup_read_blkio(&cg->io_serviced);
cgroup_read_blkio(&cg->throttle_io_service_bytes);
cgroup_read_blkio(&cg->throttle_io_serviced);
cgroup_read_blkio(&cg->io_merged);
cgroup_read_blkio(&cg->io_queued);
}
void read_all_cgroups(struct cgroup *root) {
debug(D_CGROUP, "reading metrics for all cgroups");
struct cgroup *cg;
for(cg = root; cg ; cg = cg->next)
if(cg->enabled && cg->available)
cgroup_read(cg);
}
// ----------------------------------------------------------------------------
// add/remove/find cgroup objects
#define CGROUP_CHARTID_LINE_MAX 1024
void cgroup_get_chart_id(struct cgroup *cg) {
debug(D_CGROUP, "getting the name of cgroup '%s'", cg->id);
pid_t cgroup_pid;
char buffer[CGROUP_CHARTID_LINE_MAX + 1];
snprintfz(buffer, CGROUP_CHARTID_LINE_MAX, "exec %s '%s'",
config_get("plugin:cgroups", "script to get cgroup names", PLUGINS_DIR "/cgroup-name.sh"), cg->chart_id);
debug(D_CGROUP, "executing command '%s' for cgroup '%s'", buffer, cg->id);
FILE *fp = mypopen(buffer, &cgroup_pid);
if(!fp) {
error("CGROUP: Cannot popen(\"%s\", \"r\").", buffer);
return;
}
debug(D_CGROUP, "reading from command '%s' for cgroup '%s'", buffer, cg->id);
char *s = fgets(buffer, CGROUP_CHARTID_LINE_MAX, fp);
debug(D_CGROUP, "closing command for cgroup '%s'", cg->id);
mypclose(fp, cgroup_pid);
debug(D_CGROUP, "closed command for cgroup '%s'", cg->id);
if(s && *s && *s != '\n') {
debug(D_CGROUP, "cgroup '%s' should be renamed to '%s'", cg->id, s);
trim(s);
freez(cg->chart_title);
cg->chart_title = strdupz(s);
netdata_fix_chart_name(cg->chart_title);
freez(cg->chart_id);
cg->chart_id = strdupz(s);
netdata_fix_chart_id(cg->chart_id);
cg->hash_chart = simple_hash(cg->chart_id);
debug(D_CGROUP, "cgroup '%s' renamed to '%s' (title: '%s')", cg->id, cg->chart_id, cg->chart_title);
}
else debug(D_CGROUP, "cgroup '%s' is not to be renamed (will be shown as '%s')", cg->id, cg->chart_id);
}
struct cgroup *cgroup_add(const char *id) {
debug(D_CGROUP, "adding cgroup '%s'", id);
if(cgroup_root_count >= cgroup_root_max) {
info("Maximum number of cgroups reached (%d). Not adding cgroup '%s'", cgroup_root_count, id);
return NULL;
}
int def = cgroup_enable_new_cgroups_detected_at_runtime;
const char *chart_id = id;
if(!*chart_id) {
chart_id = "/";
// disable by default the root cgroup
def = 0;
debug(D_CGROUP, "cgroup '%s' is the root container (by default %s)", id, (def)?"enabled":"disabled");
}
else {
if(*chart_id == '/') chart_id++;
size_t len = strlen(chart_id);
// disable by default the parent cgroup
// for known cgroup managers
if(!strcmp(chart_id, "lxc") ||
!strcmp(chart_id, "docker") ||
!strcmp(chart_id, "libvirt") ||
!strcmp(chart_id, "qemu") ||
!strcmp(chart_id, "systemd") ||
!strcmp(chart_id, "system.slice") ||
!strcmp(chart_id, "machine.slice") ||
!strcmp(chart_id, "init.scope") ||
!strcmp(chart_id, "user") ||
!strcmp(chart_id, "system") ||
!strcmp(chart_id, "machine") ||
// starts with them
(len > 6 && !strncmp(chart_id, "user/", 6)) ||
(len > 11 && !strncmp(chart_id, "user.slice/", 11)) ||
// ends with them
(len > 5 && !strncmp(&chart_id[len - 5], ".user", 5)) ||
(len > 5 && !strncmp(&chart_id[len - 5], ".swap", 5)) ||
(len > 6 && !strncmp(&chart_id[len - 6], ".slice", 6)) ||
(len > 6 && !strncmp(&chart_id[len - 6], ".mount", 6)) ||
(len > 8 && !strncmp(&chart_id[len - 8], ".session", 8)) ||
(len > 8 && !strncmp(&chart_id[len - 8], ".service", 8)) ||
(len > 10 && !strncmp(&chart_id[len - 10], ".partition", 10))
) {
def = 0;
debug(D_CGROUP, "cgroup '%s' is %s (by default)", id, (def)?"enabled":"disabled");
}
}
struct cgroup *cg = callocz(1, sizeof(struct cgroup));
cg->id = strdupz(id);
cg->hash = simple_hash(cg->id);
cg->chart_id = strdupz(chart_id);
netdata_fix_chart_id(cg->chart_id);
cg->hash_chart = simple_hash(cg->chart_id);
cg->chart_title = strdupz(chart_id);
if(!cgroup_root)
cgroup_root = cg;
else {
// append it
struct cgroup *e;
for(e = cgroup_root; e->next ;e = e->next) ;
e->next = cg;
}
cgroup_root_count++;
// fix the name by calling the external script
cgroup_get_chart_id(cg);
debug(D_CGROUP, "adding cgroup '%s' with chart id '%s'", id, chart_id);
char option[FILENAME_MAX + 1];
snprintfz(option, FILENAME_MAX, "enable cgroup %s", cg->chart_title);
cg->enabled = config_get_boolean("plugin:cgroups", option, def);
if(cg->enabled) {
struct cgroup *t;
for (t = cgroup_root; t; t = t->next) {
if (t != cg && t->enabled && t->hash_chart == cg->hash_chart && !strcmp(t->chart_id, cg->chart_id)) {
if (!strncmp(t->chart_id, "/system.slice/", 14) && !strncmp(cg->chart_id, "/init.scope/system.slice/", 25)) {
error("Control group with chart id '%s' already exists with id '%s' and is enabled. Swapping them by enabling cgroup with id '%s' and disabling cgroup with id '%s'.",
cg->chart_id, t->id, cg->id, t->id);
debug(D_CGROUP, "Control group with chart id '%s' already exists with id '%s' and is enabled. Swapping them by enabling cgroup with id '%s' and disabling cgroup with id '%s'.",
cg->chart_id, t->id, cg->id, t->id);
t->enabled = 0;
t->options |= CGROUP_OPTIONS_DISABLED_DUPLICATE;
}
else {
error("Control group with chart id '%s' already exists with id '%s' and is enabled and available. Disabling cgroup with id '%s'.",
cg->chart_id, t->id, cg->id);
debug(D_CGROUP, "Control group with chart id '%s' already exists with id '%s' and is enabled and available. Disabling cgroup with id '%s'.",
cg->chart_id, t->id, cg->id);
cg->enabled = 0;
cg->options |= CGROUP_OPTIONS_DISABLED_DUPLICATE;
}
break;
}
}
}
debug(D_CGROUP, "Added cgroup '%s' with chart id '%s' and title '%s' as %s (default was %s)", cg->id, cg->chart_id, cg->chart_title, (cg->enabled)?"enabled":"disabled", (def)?"enabled":"disabled");
return cg;
}
void cgroup_free(struct cgroup *cg) {
debug(D_CGROUP, "Removing cgroup '%s' with chart id '%s' (was %s and %s)", cg->id, cg->chart_id, (cg->enabled)?"enabled":"disabled", (cg->available)?"available":"not available");
freez(cg->cpuacct_usage.cpu_percpu);
freez(cg->cpuacct_stat.filename);
freez(cg->cpuacct_usage.filename);
freez(cg->memory.filename);
freez(cg->io_service_bytes.filename);
freez(cg->io_serviced.filename);
freez(cg->throttle_io_service_bytes.filename);
freez(cg->throttle_io_serviced.filename);
freez(cg->io_merged.filename);
freez(cg->io_queued.filename);
freez(cg->id);
freez(cg->chart_id);
freez(cg->chart_title);
freez(cg);
cgroup_root_count--;
}
// find if a given cgroup exists
struct cgroup *cgroup_find(const char *id) {
debug(D_CGROUP, "searching for cgroup '%s'", id);
uint32_t hash = simple_hash(id);
struct cgroup *cg;
for(cg = cgroup_root; cg ; cg = cg->next) {
if(hash == cg->hash && strcmp(id, cg->id) == 0)
break;
}
debug(D_CGROUP, "cgroup_find('%s') %s", id, (cg)?"found":"not found");
return cg;
}
// ----------------------------------------------------------------------------
// detect running cgroups
// callback for find_file_in_subdirs()
void found_subdir_in_dir(const char *dir) {
debug(D_CGROUP, "examining cgroup dir '%s'", dir);
struct cgroup *cg = cgroup_find(dir);
if(!cg) {
if(*dir && cgroup_max_depth > 0) {
int depth = 0;
const char *s;
for(s = dir; *s ;s++)
if(unlikely(*s == '/'))
depth++;
if(depth > cgroup_max_depth) {
info("cgroup '%s' is too deep (%d, while max is %d)", dir, depth, cgroup_max_depth);
return;
}
}
debug(D_CGROUP, "will add dir '%s' as cgroup", dir);
cg = cgroup_add(dir);
}
if(cg) cg->available = 1;
}
int find_dir_in_subdirs(const char *base, const char *this, void (*callback)(const char *)) {
debug(D_CGROUP, "searching for directories in '%s'", base);
int ret = -1;
int enabled = -1;
if(!this) this = base;
size_t dirlen = strlen(this), baselen = strlen(base);
const char *relative_path = &this[baselen];
DIR *dir = opendir(this);
if(!dir) {
error("Cannot read cgroups directory '%s'", base);
return ret;
}
ret = 1;
callback(relative_path);
struct dirent *de = NULL;
while((de = readdir(dir))) {
if(de->d_type == DT_DIR
&& (
(de->d_name[0] == '.' && de->d_name[1] == '\0')
|| (de->d_name[0] == '.' && de->d_name[1] == '.' && de->d_name[2] == '\0')
))
continue;
debug(D_CGROUP, "examining '%s/%s'", this, de->d_name);
if(de->d_type == DT_DIR) {
if(enabled == -1) {
const char *r = relative_path;
if(*r == '\0') r = "/";
else if (*r == '/') r++;
// we check for this option here
// so that the config will not have settings
// for leaf directories
char option[FILENAME_MAX + 1];
snprintfz(option, FILENAME_MAX, "search for cgroups under %s", r);
option[FILENAME_MAX] = '\0';
enabled = config_get_boolean("plugin:cgroups", option, 1);
}
if(enabled) {
char *s = mallocz(dirlen + strlen(de->d_name) + 2);
strcpy(s, this);
strcat(s, "/");
strcat(s, de->d_name);
int ret2 = find_dir_in_subdirs(base, s, callback);
if(ret2 > 0) ret += ret2;
freez(s);
}
}
}
closedir(dir);
return ret;
}
void mark_all_cgroups_as_not_available() {
debug(D_CGROUP, "marking all cgroups as not available");
struct cgroup *cg;
// mark all as not available
for(cg = cgroup_root; cg ; cg = cg->next) {
cg->available = 0;
}
}
void cleanup_all_cgroups() {
struct cgroup *cg = cgroup_root, *last = NULL;
for(; cg ;) {
if(!cg->available) {
// enable the first duplicate cgroup
{
struct cgroup *t;
for(t = cgroup_root; t ; t = t->next) {
if(t != cg && t->available && !t->enabled && t->options & CGROUP_OPTIONS_DISABLED_DUPLICATE && t->hash_chart == cg->hash_chart && !strcmp(t->chart_id, cg->chart_id)) {
debug(D_CGROUP, "Enabling duplicate of cgroup '%s' with id '%s', because the original with id '%s' stopped.", t->chart_id, t->id, cg->id);
t->enabled = 1;
t->options &= ~CGROUP_OPTIONS_DISABLED_DUPLICATE;
break;
}
}
}
if(!last)
cgroup_root = cg->next;
else
last->next = cg->next;
cgroup_free(cg);
if(!last)
cg = cgroup_root;
else
cg = last->next;
}
else {
last = cg;
cg = cg->next;
}
}
}
void find_all_cgroups() {
debug(D_CGROUP, "searching for cgroups");
mark_all_cgroups_as_not_available();
if(cgroup_enable_cpuacct_stat || cgroup_enable_cpuacct_usage) {
if (find_dir_in_subdirs(cgroup_cpuacct_base, NULL, found_subdir_in_dir) == -1) {
cgroup_enable_cpuacct_stat = cgroup_enable_cpuacct_usage = 0;
error("disabled cgroup cpu statistics.");
}
}
if(cgroup_enable_blkio) {
if (find_dir_in_subdirs(cgroup_blkio_base, NULL, found_subdir_in_dir) == -1) {
cgroup_enable_blkio = 0;
error("disabled cgroup blkio statistics.");
}
}
if(cgroup_enable_memory) {
if(find_dir_in_subdirs(cgroup_memory_base, NULL, found_subdir_in_dir) == -1) {
cgroup_enable_memory = 0;
error("disabled cgroup memory statistics.");
}
}
if(cgroup_enable_devices) {
if(find_dir_in_subdirs(cgroup_devices_base, NULL, found_subdir_in_dir) == -1) {
cgroup_enable_devices = 0;
error("disabled cgroup devices statistics.");
}
}
// remove any non-existing cgroups
cleanup_all_cgroups();
struct cgroup *cg;
struct stat buf;
for(cg = cgroup_root; cg ; cg = cg->next) {
// fprintf(stderr, " >>> CGROUP '%s' (%u - %s) with name '%s'\n", cg->id, cg->hash, cg->available?"available":"stopped", cg->name);
if(unlikely(!cg->available))
continue;
debug(D_CGROUP, "checking paths for cgroup '%s'", cg->id);
// check for newly added cgroups
// and update the filenames they read
char filename[FILENAME_MAX + 1];
if(cgroup_enable_cpuacct_stat && !cg->cpuacct_stat.filename) {