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- /*
- * birq
- *
- * Balance IRQ
- *
- */
- #ifdef HAVE_CONFIG_H
- #include "config.h"
- #endif /* HAVE_CONFIG_H */
- #include <stdio.h>
- #include <stdlib.h>
- #include <unistd.h>
- #include <sys/types.h>
- #include <errno.h>
- #include <assert.h>
- #include <string.h>
- #include <signal.h>
- #include <syslog.h>
- #include <fcntl.h>
- #include <time.h>
- #ifdef HAVE_GETOPT_H
- #include <getopt.h>
- #endif
- #include "birq.h"
- #include "lub/log.h"
- #include "lub/list.h"
- #include "lub/ini.h"
- #include "irq.h"
- #include "numa.h"
- #include "cpu.h"
- #include "statistics.h"
- #include "balance.h"
- #include "pxm.h"
- #ifndef VERSION
- #define VERSION "1.2.0"
- #endif
- /* Signal handlers */
- static volatile int sigterm = 0; /* Exit if 1 */
- static void sighandler(int signo);
- static volatile int sighup = 0; /* Re-read config file */
- static void sighup_handler(int signo);
- static void help(int status, const char *argv0);
- static struct options *opts_init(void);
- static void opts_free(struct options *opts);
- static int opts_parse(int argc, char *argv[], struct options *opts);
- static int parse_config(const char *fname, struct options *opts);
- /* Command line options */
- struct options {
- char *pidfile;
- char *cfgfile;
- int cfgfile_userdefined;
- char *pxm; /* Proximity config file */
- int debug; /* Don't daemonize in debug mode */
- int log_facility;
- float threshold;
- float load_limit;
- int verbose;
- int ht;
- int non_local_cpus;
- unsigned int long_interval;
- unsigned int short_interval;
- birq_choose_strategy_e strategy;
- cpumask_t exclude_cpus;
- };
- /*--------------------------------------------------------- */
- int main(int argc, char **argv)
- {
- int retval = -1;
- struct options *opts = NULL;
- int pidfd = -1;
- unsigned int interval;
- /* Signal vars */
- struct sigaction sig_act;
- sigset_t sig_set;
- /* IRQ list. It contain all found IRQs. */
- lub_list_t *irqs;
- /* IRQs need to be balanced */
- lub_list_t *balance_irqs;
- /* CPU list. It contain all found CPUs. */
- lub_list_t *cpus;
- /* NUMA list. It contain all found NUMA nodes. */
- lub_list_t *numas;
- /* Proximity list. */
- lub_list_t *pxms;
- /* Parse command line options */
- opts = opts_init();
- if (opts_parse(argc, argv, opts))
- goto err;
- /* Parse config file */
- if (!access(opts->cfgfile, R_OK)) {
- if (parse_config(opts->cfgfile, opts))
- goto err;
- } else if (opts->cfgfile_userdefined) {
- fprintf(stderr, "Error: Can't find config file %s\n",
- opts->cfgfile);
- goto err;
- }
- /* Initialize syslog */
- openlog(argv[0], LOG_CONS, opts->log_facility);
- syslog(LOG_ERR, "Start daemon.\n");
- /* Fork the daemon */
- if (!opts->debug) {
- /* Daemonize */
- if (daemon(0, 0) < 0) {
- syslog(LOG_ERR, "Can't daemonize\n");
- goto err;
- }
- /* Write pidfile */
- if ((pidfd = open(opts->pidfile,
- O_WRONLY | O_CREAT | O_EXCL | O_TRUNC,
- S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)) < 0) {
- syslog(LOG_WARNING, "Can't open pidfile %s: %s\n",
- opts->pidfile, strerror(errno));
- } else {
- char str[20];
- snprintf(str, sizeof(str), "%u\n", getpid());
- str[sizeof(str) - 1] = '\0';
- if (write(pidfd, str, strlen(str)) < 0)
- syslog(LOG_WARNING, "Can't write to %s: %s\n",
- opts->pidfile, strerror(errno));
- close(pidfd);
- }
- }
- /* Set signal handler */
- sigemptyset(&sig_set);
- sigaddset(&sig_set, SIGTERM);
- sigaddset(&sig_set, SIGINT);
- sigaddset(&sig_set, SIGQUIT);
- sig_act.sa_flags = 0;
- sig_act.sa_mask = sig_set;
- sig_act.sa_handler = &sighandler;
- sigaction(SIGTERM, &sig_act, NULL);
- sigaction(SIGINT, &sig_act, NULL);
- sigaction(SIGQUIT, &sig_act, NULL);
- /* SIGHUP handler */
- sigemptyset(&sig_set);
- sigaddset(&sig_set, SIGHUP);
- sig_act.sa_flags = 0;
- sig_act.sa_mask = sig_set;
- sig_act.sa_handler = &sighup_handler;
- sigaction(SIGHUP, &sig_act, NULL);
- /* Randomize */
- srand(time(NULL));
- /* Scan NUMA nodes */
- numas = lub_list_new(numa_list_compare);
- scan_numas(numas);
- if (opts->verbose)
- show_numas(numas);
- /* Scan CPUs */
- cpus = lub_list_new(cpu_list_compare);
- scan_cpus(cpus, opts->ht);
- if (opts->verbose)
- show_cpus(cpus);
- /* Prepare data structures */
- irqs = lub_list_new(irq_list_compare);
- balance_irqs = lub_list_new(irq_list_compare);
- /* Parse proximity file */
- pxms = lub_list_new(NULL);
- if (opts->pxm)
- parse_pxm_config(opts->pxm, pxms, numas);
- if (opts->verbose)
- show_pxms(pxms);
- /* Main loop */
- while (!sigterm) {
- lub_list_node_t *node;
- char outstr[10];
- time_t t;
- struct tm *tmp;
- t = time(NULL);
- tmp = localtime(&t);
- if (tmp) {
- strftime(outstr, sizeof(outstr), "%H:%M:%S", tmp);
- printf("----[ %s ]----------------------------------------------------------------\n", outstr);
- }
- /* Re-read config file on SIGHUP */
- if (sighup) {
- if (!access(opts->cfgfile, R_OK)) {
- syslog(LOG_ERR, "Re-reading config file\n");
- if (parse_config(opts->cfgfile, opts))
- syslog(LOG_ERR, "Error while config file parsing.\n");
- } else if (opts->cfgfile_userdefined)
- syslog(LOG_ERR, "Can't find config file.\n");
- sighup = 0;
- }
- /* Rescan PCI devices for new IRQs. */
- scan_irqs(irqs, balance_irqs, pxms);
- if (opts->verbose)
- irq_list_show(irqs);
- /* Link IRQs to CPUs due to real current smp affinity. */
- link_irqs_to_cpus(cpus, irqs);
- /* Gather statistics on CPU load and number of interrupts. */
- gather_statistics(cpus, irqs);
- show_statistics(cpus, opts->verbose);
- /* Choose IRQ to move to another CPU. */
- choose_irqs_to_move(cpus, balance_irqs,
- opts->threshold, opts->strategy, &opts->exclude_cpus);
- /* Balance IRQs */
- if (lub_list_len(balance_irqs) != 0) {
- /* Set short interval to make balancing faster. */
- interval = opts->short_interval;
- /* Choose new CPU for IRQs need to be balanced. */
- balance(cpus, balance_irqs, opts->load_limit,
- &opts->exclude_cpus, opts->non_local_cpus);
- /* Write new values to /proc/irq/<IRQ>/smp_affinity */
- apply_affinity(balance_irqs);
- /* Free list of balanced IRQs */
- while ((node = lub_list__get_tail(balance_irqs))) {
- lub_list_del(balance_irqs, node);
- lub_list_node_free(node);
- }
- } else {
- /* If nothing to balance */
- interval = opts->long_interval;
- }
-
- /* Wait before next iteration */
- sleep(interval);
- }
- /* Free data structures */
- irq_list_free(irqs);
- lub_list_free(balance_irqs);
- cpu_list_free(cpus);
- numa_list_free(numas);
- pxm_list_free(pxms);
- retval = 0;
- err:
- /* Remove pidfile */
- if (pidfd >= 0) {
- if (unlink(opts->pidfile) < 0) {
- syslog(LOG_ERR, "Can't remove pid-file %s: %s\n",
- opts->pidfile, strerror(errno));
- }
- }
- /* Free command line options */
- opts_free(opts);
- syslog(LOG_ERR, "Stop daemon.\n");
- return retval;
- }
- /*--------------------------------------------------------- */
- /* Signal handler for temination signals (like SIGTERM, SIGINT, ...) */
- static void sighandler(int signo)
- {
- sigterm = 1;
- signo = signo; /* Happy compiler */
- }
- /*--------------------------------------------------------- */
- /* Re-read config file on SIGHUP */
- static void sighup_handler(int signo)
- {
- sighup = 1;
- signo = signo; /* Happy compiler */
- }
- /*--------------------------------------------------------- */
- /* Set defaults for options from config file (not command line) */
- static void opts_default_config(struct options *opts)
- {
- assert(opts);
- opts->threshold = BIRQ_DEFAULT_THRESHOLD;
- opts->load_limit = BIRQ_DEFAULT_LOAD_LIMIT;
- opts->ht = 1; /* It's 1 since 1.5.0 */
- opts->non_local_cpus = 0;
- opts->long_interval = BIRQ_LONG_INTERVAL;
- opts->short_interval = BIRQ_SHORT_INTERVAL;
- opts->strategy = BIRQ_CHOOSE_RND;
- cpus_clear(opts->exclude_cpus);
- }
- /*--------------------------------------------------------- */
- /* Initialize option structure by defaults */
- static struct options *opts_init(void)
- {
- struct options *opts = NULL;
- // Allocate structures
- opts = malloc(sizeof(*opts));
- assert(opts);
- cpus_init(opts->exclude_cpus);
- // Set command line options defaults.
- opts->debug = 0; /* daemonize by default */
- opts->pidfile = strdup(BIRQ_PIDFILE);
- opts->cfgfile = strdup(BIRQ_CFGFILE);
- opts->cfgfile_userdefined = 0;
- opts->pxm = NULL;
- opts->log_facility = LOG_DAEMON;
- opts->verbose = 0;
- // The daemon can be used without config file. So set defaults for
- // options from config file.
- opts_default_config(opts);
- return opts;
- }
- /*--------------------------------------------------------- */
- /* Free option structure */
- static void opts_free(struct options *opts)
- {
- if (opts->pidfile)
- free(opts->pidfile);
- if (opts->cfgfile)
- free(opts->cfgfile);
- if (opts->pxm)
- free(opts->pxm);
- cpus_free(opts->exclude_cpus);
- free(opts);
- }
- /* Parse y/n options */
- static int opt_parse_y_n(const char *optarg, int *flag)
- {
- assert(optarg);
- assert(flag);
- if (!strcmp(optarg, "y"))
- *flag = 1;
- else if (!strcmp(optarg, "yes"))
- *flag = 1;
- else if (!strcmp(optarg, "n"))
- *flag = 0;
- else if (!strcmp(optarg, "no"))
- *flag = 0;
- else {
- fprintf(stderr, "Error: Illegal flag value %s.\n", optarg);
- return -1;
- }
- return 0;
- }
- /* Parse 'strategy' option */
- static int opt_parse_strategy(const char *optarg, birq_choose_strategy_e *strategy)
- {
- assert(optarg);
- assert(strategy);
- if (!strcmp(optarg, "max"))
- *strategy = BIRQ_CHOOSE_MAX;
- else if (!strcmp(optarg, "min"))
- *strategy = BIRQ_CHOOSE_MIN;
- else if (!strcmp(optarg, "rnd"))
- *strategy = BIRQ_CHOOSE_RND;
- else {
- fprintf(stderr, "Error: Illegal strategy value %s.\n", optarg);
- return -1;
- }
- return 0;
- }
- /* Parse 'threshold' and 'load-limit' options */
- static int opt_parse_threshold(const char *optarg, float *threshold)
- {
- char *endptr;
- float thresh;
- assert(optarg);
- assert(threshold);
- thresh = strtof(optarg, &endptr);
- if (endptr == optarg) {
- fprintf(stderr, "Error: Illegal threshold/load-limit value %s.\n", optarg);
- return -1;
- }
- if (thresh > 100.00) {
- fprintf(stderr, "Error: The threshold/load-limit value %s > 100.\n", optarg);
- return -1;
- }
- *threshold = thresh;
- return 0;
- }
- /* Parse 'short-interval' and 'long-interval' options */
- static int opt_parse_interval(const char *optarg, unsigned int *interval)
- {
- char *endptr;
- unsigned long int val;
- assert(optarg);
- assert(interval);
- val = strtoul(optarg, &endptr, 10);
- if (endptr == optarg) {
- fprintf(stderr, "Error: Illegal interval value %s.\n", optarg);
- return -1;
- }
- *interval = val;
- return 0;
- }
- /*--------------------------------------------------------- */
- /* Parse command line options */
- static int opts_parse(int argc, char *argv[], struct options *opts)
- {
- static const char *shortopts = "hp:c:dO:vx:";
- #ifdef HAVE_GETOPT_H
- static const struct option longopts[] = {
- {"help", 0, NULL, 'h'},
- {"pid", 1, NULL, 'p'},
- {"conf", 1, NULL, 'c'},
- {"debug", 0, NULL, 'd'},
- {"facility", 1, NULL, 'O'},
- {"verbose", 0, NULL, 'v'},
- {"pxm", 1, NULL, 'x'},
- {NULL, 0, NULL, 0}
- };
- #endif
- optind = 1;
- while(1) {
- int opt;
- #ifdef HAVE_GETOPT_H
- opt = getopt_long(argc, argv, shortopts, longopts, NULL);
- #else
- opt = getopt(argc, argv, shortopts);
- #endif
- if (-1 == opt)
- break;
- switch (opt) {
- case 'p':
- if (opts->pidfile)
- free(opts->pidfile);
- opts->pidfile = strdup(optarg);
- break;
- case 'c':
- if (opts->cfgfile)
- free(opts->cfgfile);
- opts->cfgfile = strdup(optarg);
- opts->cfgfile_userdefined = 1;
- break;
- case 'x':
- if (opts->pxm)
- free(opts->pxm);
- opts->pxm = strdup(optarg);
- break;
- case 'd':
- opts->debug = 1;
- break;
- case 'v':
- opts->verbose = 1;
- break;
- case 'O':
- if (lub_log_facility(optarg, &(opts->log_facility))) {
- fprintf(stderr, "Error: Illegal syslog facility %s.\n", optarg);
- exit(-1);
- }
- break;
- case 'h':
- help(0, argv[0]);
- exit(0);
- break;
- default:
- help(-1, argv[0]);
- exit(-1);
- break;
- }
- }
- return 0;
- }
- /*--------------------------------------------------------- */
- /* Print help message */
- static void help(int status, const char *argv0)
- {
- const char *name = NULL;
- if (!argv0)
- return;
- /* Find the basename */
- name = strrchr(argv0, '/');
- if (name)
- name++;
- else
- name = argv0;
- if (status != 0) {
- fprintf(stderr, "Try `%s -h' for more information.\n",
- name);
- } else {
- printf("Version : %s\n", VERSION);
- printf("Usage : %s [options]\n", name);
- printf("Daemon to balance IRQs.\n");
- printf("Options :\n");
- printf("\t-h, --help Print this help.\n");
- printf("\t-d, --debug Debug mode. Don't daemonize.\n");
- printf("\t-v, --verbose Be verbose.\n");
- printf("\t-r, --ht This option is obsoleted. The Hyper Threading is enabled by default.\n");
- printf("\t-p <path>, --pid=<path> File to save daemon's PID to (" BIRQ_PIDFILE ").\n");
- printf("\t-c <path>, --conf=<path> Config file (" BIRQ_CFGFILE ").\n");
- printf("\t-x <path>, --pxm=<path> Proximity config file.\n");
- printf("\t-O, --facility Syslog facility (DAEMON).\n");
- printf("\t-t <float>, --threshold=<float> Threshold to consider CPU is overloaded, in percents. Default threhold is %.2f.\n",
- BIRQ_DEFAULT_THRESHOLD);
- printf("\t-l <float>, --load-limit=<float> Don't move IRQs to CPUs loaded more than this limit, in percents. Default limit is %.2f.\n",
- BIRQ_DEFAULT_LOAD_LIMIT);
- printf("\t-i <sec>, --short-interval=<sec> Short iteration interval.\n");
- printf("\t-I <sec>, --long-interval=<sec> Long iteration interval.\n");
- printf("\t-s <strategy>, --strategy=<strategy> Strategy to choose IRQ to move (min/max/rnd).\n");
- }
- }
- /*--------------------------------------------------------- */
- /* Parse config file */
- static int parse_config(const char *fname, struct options *opts)
- {
- int ret = -1; /* Pessimistic retval */
- lub_ini_t *ini = NULL;
- const char *tmp = NULL;
- cpumask_t use_cpus;
- // Set options defaults. It's necessary because the config file can be
- // re-read by SIGHUP. So we need to drop old values to default state.
- opts_default_config(opts);
- ini = lub_ini_new();
- if (lub_ini_parse_file(ini, fname)) {
- lub_ini_free(ini);
- return -1;
- }
- if ((tmp = lub_ini_find(ini, "strategy")))
- if (opt_parse_strategy(tmp, &opts->strategy) < 0)
- goto err;
- if ((tmp = lub_ini_find(ini, "threshold")))
- if (opt_parse_threshold(tmp, &opts->threshold))
- goto err;
- if ((tmp = lub_ini_find(ini, "load-limit")))
- if (opt_parse_threshold(tmp, &opts->load_limit))
- goto err;
- if ((tmp = lub_ini_find(ini, "short-interval")))
- if (opt_parse_interval(tmp, &opts->short_interval))
- goto err;
- if ((tmp = lub_ini_find(ini, "long-interval")))
- if (opt_parse_interval(tmp, &opts->long_interval))
- goto err;
- if ((tmp = lub_ini_find(ini, "exclude-cpus"))) {
- if (cpumask_parse_user(tmp, strlen(tmp), opts->exclude_cpus)) {
- fprintf(stderr, "Error: Can't parse exclude-cpus option \"%s\".\n", tmp);
- goto err;
- }
- }
- cpus_init(use_cpus);
- if ((tmp = lub_ini_find(ini, "use-cpus"))) {
- if (cpumask_parse_user(tmp, strlen(tmp), use_cpus)) {
- fprintf(stderr, "Error: Can't parse use-cpus option \"%s\".\n", tmp);
- goto err;
- }
- } else {
- cpus_setall(use_cpus);
- }
- /* The exclude-cpus option was implemented first. So the
- * programm is based on it. The use-cpus options really
- * says to exclude all the cpus that is not within bitmask.
- * So invert use-cpus and we'll get exclude-cpus mask.
- */
- cpus_complement(use_cpus, use_cpus);
- /* Calculate real exclude-cpu mask (consider use-cpus option).
- * real-exclude-cpus = exclude-cpus | ~use-cpus
- */
- cpus_or(opts->exclude_cpus, opts->exclude_cpus, use_cpus);
- cpus_free(use_cpus);
- if ((tmp = lub_ini_find(ini, "ht")))
- if (opt_parse_y_n(tmp, &opts->ht))
- goto err;
- if ((tmp = lub_ini_find(ini, "non-local-cpus")))
- if (opt_parse_y_n(tmp, &opts->non_local_cpus))
- goto err;
- ret = 0;
- err:
- lub_ini_free(ini);
- return ret;
- }
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