diff options
Diffstat (limited to 'kernel/sched/debug.c')
| -rw-r--r-- | kernel/sched/debug.c | 870 |
1 files changed, 569 insertions, 301 deletions
diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c index 2357921580f9..ef047add7f9e 100644 --- a/kernel/sched/debug.c +++ b/kernel/sched/debug.c @@ -6,12 +6,9 @@ * * Copyright(C) 2007, Red Hat, Inc., Ingo Molnar */ -#include "sched.h" - -static DEFINE_SPINLOCK(sched_debug_lock); /* - * This allows printing both to /proc/sched_debug and + * This allows printing both to /sys/kernel/debug/sched/debug and * to the console */ #define SEQ_printf(m, x...) \ @@ -169,245 +166,478 @@ static const struct file_operations sched_feat_fops = { .release = single_release, }; -__read_mostly bool sched_debug_enabled; +#ifdef CONFIG_SMP -static __init int sched_init_debug(void) +static ssize_t sched_scaling_write(struct file *filp, const char __user *ubuf, + size_t cnt, loff_t *ppos) { - debugfs_create_file("sched_features", 0644, NULL, NULL, - &sched_feat_fops); + char buf[16]; + unsigned int scaling; - debugfs_create_bool("sched_debug", 0644, NULL, - &sched_debug_enabled); + if (cnt > 15) + cnt = 15; - return 0; + if (copy_from_user(&buf, ubuf, cnt)) + return -EFAULT; + buf[cnt] = '\0'; + + if (kstrtouint(buf, 10, &scaling)) + return -EINVAL; + + if (scaling >= SCHED_TUNABLESCALING_END) + return -EINVAL; + + sysctl_sched_tunable_scaling = scaling; + if (sched_update_scaling()) + return -EINVAL; + + *ppos += cnt; + return cnt; } -late_initcall(sched_init_debug); -#ifdef CONFIG_SMP +static int sched_scaling_show(struct seq_file *m, void *v) +{ + seq_printf(m, "%d\n", sysctl_sched_tunable_scaling); + return 0; +} -#ifdef CONFIG_SYSCTL +static int sched_scaling_open(struct inode *inode, struct file *filp) +{ + return single_open(filp, sched_scaling_show, NULL); +} -static struct ctl_table sd_ctl_dir[] = { - { - .procname = "sched_domain", - .mode = 0555, - }, - {} +static const struct file_operations sched_scaling_fops = { + .open = sched_scaling_open, + .write = sched_scaling_write, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, }; -static struct ctl_table sd_ctl_root[] = { - { - .procname = "kernel", - .mode = 0555, - .child = sd_ctl_dir, - }, - {} -}; +#endif /* SMP */ + +#ifdef CONFIG_PREEMPT_DYNAMIC -static struct ctl_table *sd_alloc_ctl_entry(int n) +static ssize_t sched_dynamic_write(struct file *filp, const char __user *ubuf, + size_t cnt, loff_t *ppos) { - struct ctl_table *entry = - kcalloc(n, sizeof(struct ctl_table), GFP_KERNEL); + char buf[16]; + int mode; + + if (cnt > 15) + cnt = 15; - return entry; + if (copy_from_user(&buf, ubuf, cnt)) + return -EFAULT; + + buf[cnt] = 0; + mode = sched_dynamic_mode(strstrip(buf)); + if (mode < 0) + return mode; + + sched_dynamic_update(mode); + + *ppos += cnt; + + return cnt; } -static void sd_free_ctl_entry(struct ctl_table **tablep) +static int sched_dynamic_show(struct seq_file *m, void *v) { - struct ctl_table *entry; - - /* - * In the intermediate directories, both the child directory and - * procname are dynamically allocated and could fail but the mode - * will always be set. In the lowest directory the names are - * static strings and all have proc handlers. - */ - for (entry = *tablep; entry->mode; entry++) { - if (entry->child) - sd_free_ctl_entry(&entry->child); - if (entry->proc_handler == NULL) - kfree(entry->procname); + static const char * preempt_modes[] = { + "none", "voluntary", "full", "lazy", + }; + int j = ARRAY_SIZE(preempt_modes) - !IS_ENABLED(CONFIG_ARCH_HAS_PREEMPT_LAZY); + int i = IS_ENABLED(CONFIG_PREEMPT_RT) * 2; + + for (; i < j; i++) { + if (preempt_dynamic_mode == i) + seq_puts(m, "("); + seq_puts(m, preempt_modes[i]); + if (preempt_dynamic_mode == i) + seq_puts(m, ")"); + + seq_puts(m, " "); } - kfree(*tablep); - *tablep = NULL; + seq_puts(m, "\n"); + return 0; } -static void -set_table_entry(struct ctl_table *entry, - const char *procname, void *data, int maxlen, - umode_t mode, proc_handler *proc_handler) +static int sched_dynamic_open(struct inode *inode, struct file *filp) { - entry->procname = procname; - entry->data = data; - entry->maxlen = maxlen; - entry->mode = mode; - entry->proc_handler = proc_handler; + return single_open(filp, sched_dynamic_show, NULL); } -static int sd_ctl_doflags(struct ctl_table *table, int write, - void *buffer, size_t *lenp, loff_t *ppos) +static const struct file_operations sched_dynamic_fops = { + .open = sched_dynamic_open, + .write = sched_dynamic_write, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +#endif /* CONFIG_PREEMPT_DYNAMIC */ + +__read_mostly bool sched_debug_verbose; + +#ifdef CONFIG_SMP +static struct dentry *sd_dentry; + + +static ssize_t sched_verbose_write(struct file *filp, const char __user *ubuf, + size_t cnt, loff_t *ppos) { - unsigned long flags = *(unsigned long *)table->data; - size_t data_size = 0; - size_t len = 0; - char *tmp, *buf; - int idx; + ssize_t result; + bool orig; - if (write) - return 0; + cpus_read_lock(); + mutex_lock(&sched_domains_mutex); - for_each_set_bit(idx, &flags, __SD_FLAG_CNT) { - char *name = sd_flag_debug[idx].name; + orig = sched_debug_verbose; + result = debugfs_write_file_bool(filp, ubuf, cnt, ppos); - /* Name plus whitespace */ - data_size += strlen(name) + 1; + if (sched_debug_verbose && !orig) + update_sched_domain_debugfs(); + else if (!sched_debug_verbose && orig) { + debugfs_remove(sd_dentry); + sd_dentry = NULL; } - if (*ppos > data_size) { - *lenp = 0; - return 0; - } + mutex_unlock(&sched_domains_mutex); + cpus_read_unlock(); - buf = kcalloc(data_size + 1, sizeof(*buf), GFP_KERNEL); - if (!buf) - return -ENOMEM; + return result; +} +#else +#define sched_verbose_write debugfs_write_file_bool +#endif - for_each_set_bit(idx, &flags, __SD_FLAG_CNT) { - char *name = sd_flag_debug[idx].name; +static const struct file_operations sched_verbose_fops = { + .read = debugfs_read_file_bool, + .write = sched_verbose_write, + .open = simple_open, + .llseek = default_llseek, +}; - len += snprintf(buf + len, strlen(name) + 2, "%s ", name); - } +static const struct seq_operations sched_debug_sops; + +static int sched_debug_open(struct inode *inode, struct file *filp) +{ + return seq_open(filp, &sched_debug_sops); +} + +static const struct file_operations sched_debug_fops = { + .open = sched_debug_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release, +}; + +enum dl_param { + DL_RUNTIME = 0, + DL_PERIOD, +}; + +static unsigned long fair_server_period_max = (1UL << 22) * NSEC_PER_USEC; /* ~4 seconds */ +static unsigned long fair_server_period_min = (100) * NSEC_PER_USEC; /* 100 us */ + +static ssize_t sched_fair_server_write(struct file *filp, const char __user *ubuf, + size_t cnt, loff_t *ppos, enum dl_param param) +{ + long cpu = (long) ((struct seq_file *) filp->private_data)->private; + struct rq *rq = cpu_rq(cpu); + u64 runtime, period; + size_t err; + int retval; + u64 value; + + err = kstrtoull_from_user(ubuf, cnt, 10, &value); + if (err) + return err; + + scoped_guard (rq_lock_irqsave, rq) { + runtime = rq->fair_server.dl_runtime; + period = rq->fair_server.dl_period; + + switch (param) { + case DL_RUNTIME: + if (runtime == value) + break; + runtime = value; + break; + case DL_PERIOD: + if (value == period) + break; + period = value; + break; + } + + if (runtime > period || + period > fair_server_period_max || + period < fair_server_period_min) { + return -EINVAL; + } - tmp = buf + *ppos; - len -= *ppos; + if (rq->cfs.h_nr_queued) { + update_rq_clock(rq); + dl_server_stop(&rq->fair_server); + } - if (len > *lenp) - len = *lenp; - if (len) - memcpy(buffer, tmp, len); - if (len < *lenp) { - ((char *)buffer)[len] = '\n'; - len++; + retval = dl_server_apply_params(&rq->fair_server, runtime, period, 0); + if (retval) + cnt = retval; + + if (!runtime) + printk_deferred("Fair server disabled in CPU %d, system may crash due to starvation.\n", + cpu_of(rq)); + + if (rq->cfs.h_nr_queued) + dl_server_start(&rq->fair_server); } - *lenp = len; - *ppos += len; + *ppos += cnt; + return cnt; +} - kfree(buf); +static size_t sched_fair_server_show(struct seq_file *m, void *v, enum dl_param param) +{ + unsigned long cpu = (unsigned long) m->private; + struct rq *rq = cpu_rq(cpu); + u64 value; + + switch (param) { + case DL_RUNTIME: + value = rq->fair_server.dl_runtime; + break; + case DL_PERIOD: + value = rq->fair_server.dl_period; + break; + } + seq_printf(m, "%llu\n", value); return 0; + } -static struct ctl_table * -sd_alloc_ctl_domain_table(struct sched_domain *sd) +static ssize_t +sched_fair_server_runtime_write(struct file *filp, const char __user *ubuf, + size_t cnt, loff_t *ppos) { - struct ctl_table *table = sd_alloc_ctl_entry(9); - - if (table == NULL) - return NULL; - - set_table_entry(&table[0], "min_interval", &sd->min_interval, sizeof(long), 0644, proc_doulongvec_minmax); - set_table_entry(&table[1], "max_interval", &sd->max_interval, sizeof(long), 0644, proc_doulongvec_minmax); - set_table_entry(&table[2], "busy_factor", &sd->busy_factor, sizeof(int), 0644, proc_dointvec_minmax); - set_table_entry(&table[3], "imbalance_pct", &sd->imbalance_pct, sizeof(int), 0644, proc_dointvec_minmax); - set_table_entry(&table[4], "cache_nice_tries", &sd->cache_nice_tries, sizeof(int), 0644, proc_dointvec_minmax); - set_table_entry(&table[5], "flags", &sd->flags, sizeof(int), 0444, sd_ctl_doflags); - set_table_entry(&table[6], "max_newidle_lb_cost", &sd->max_newidle_lb_cost, sizeof(long), 0644, proc_doulongvec_minmax); - set_table_entry(&table[7], "name", sd->name, CORENAME_MAX_SIZE, 0444, proc_dostring); - /* &table[8] is terminator */ - - return table; + return sched_fair_server_write(filp, ubuf, cnt, ppos, DL_RUNTIME); } -static struct ctl_table *sd_alloc_ctl_cpu_table(int cpu) +static int sched_fair_server_runtime_show(struct seq_file *m, void *v) { - struct ctl_table *entry, *table; - struct sched_domain *sd; - int domain_num = 0, i; - char buf[32]; - - for_each_domain(cpu, sd) - domain_num++; - entry = table = sd_alloc_ctl_entry(domain_num + 1); - if (table == NULL) - return NULL; - - i = 0; - for_each_domain(cpu, sd) { - snprintf(buf, 32, "domain%d", i); - entry->procname = kstrdup(buf, GFP_KERNEL); - entry->mode = 0555; - entry->child = sd_alloc_ctl_domain_table(sd); - entry++; - i++; - } - return table; + return sched_fair_server_show(m, v, DL_RUNTIME); } -static cpumask_var_t sd_sysctl_cpus; -static struct ctl_table_header *sd_sysctl_header; +static int sched_fair_server_runtime_open(struct inode *inode, struct file *filp) +{ + return single_open(filp, sched_fair_server_runtime_show, inode->i_private); +} -void register_sched_domain_sysctl(void) +static const struct file_operations fair_server_runtime_fops = { + .open = sched_fair_server_runtime_open, + .write = sched_fair_server_runtime_write, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static ssize_t +sched_fair_server_period_write(struct file *filp, const char __user *ubuf, + size_t cnt, loff_t *ppos) { - static struct ctl_table *cpu_entries; - static struct ctl_table **cpu_idx; - static bool init_done = false; - char buf[32]; - int i; + return sched_fair_server_write(filp, ubuf, cnt, ppos, DL_PERIOD); +} - if (!cpu_entries) { - cpu_entries = sd_alloc_ctl_entry(num_possible_cpus() + 1); - if (!cpu_entries) - return; +static int sched_fair_server_period_show(struct seq_file *m, void *v) +{ + return sched_fair_server_show(m, v, DL_PERIOD); +} + +static int sched_fair_server_period_open(struct inode *inode, struct file *filp) +{ + return single_open(filp, sched_fair_server_period_show, inode->i_private); +} - WARN_ON(sd_ctl_dir[0].child); - sd_ctl_dir[0].child = cpu_entries; +static const struct file_operations fair_server_period_fops = { + .open = sched_fair_server_period_open, + .write = sched_fair_server_period_write, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static struct dentry *debugfs_sched; + +static void debugfs_fair_server_init(void) +{ + struct dentry *d_fair; + unsigned long cpu; + + d_fair = debugfs_create_dir("fair_server", debugfs_sched); + if (!d_fair) + return; + + for_each_possible_cpu(cpu) { + struct dentry *d_cpu; + char buf[32]; + + snprintf(buf, sizeof(buf), "cpu%lu", cpu); + d_cpu = debugfs_create_dir(buf, d_fair); + + debugfs_create_file("runtime", 0644, d_cpu, (void *) cpu, &fair_server_runtime_fops); + debugfs_create_file("period", 0644, d_cpu, (void *) cpu, &fair_server_period_fops); } +} - if (!cpu_idx) { - struct ctl_table *e = cpu_entries; +static __init int sched_init_debug(void) +{ + struct dentry __maybe_unused *numa; - cpu_idx = kcalloc(nr_cpu_ids, sizeof(struct ctl_table*), GFP_KERNEL); - if (!cpu_idx) - return; + debugfs_sched = debugfs_create_dir("sched", NULL); - /* deal with sparse possible map */ - for_each_possible_cpu(i) { - cpu_idx[i] = e; - e++; - } + debugfs_create_file("features", 0644, debugfs_sched, NULL, &sched_feat_fops); + debugfs_create_file_unsafe("verbose", 0644, debugfs_sched, &sched_debug_verbose, &sched_verbose_fops); +#ifdef CONFIG_PREEMPT_DYNAMIC + debugfs_create_file("preempt", 0644, debugfs_sched, NULL, &sched_dynamic_fops); +#endif + + debugfs_create_u32("base_slice_ns", 0644, debugfs_sched, &sysctl_sched_base_slice); + + debugfs_create_u32("latency_warn_ms", 0644, debugfs_sched, &sysctl_resched_latency_warn_ms); + debugfs_create_u32("latency_warn_once", 0644, debugfs_sched, &sysctl_resched_latency_warn_once); + +#ifdef CONFIG_SMP + debugfs_create_file("tunable_scaling", 0644, debugfs_sched, NULL, &sched_scaling_fops); + debugfs_create_u32("migration_cost_ns", 0644, debugfs_sched, &sysctl_sched_migration_cost); + debugfs_create_u32("nr_migrate", 0644, debugfs_sched, &sysctl_sched_nr_migrate); + + mutex_lock(&sched_domains_mutex); + update_sched_domain_debugfs(); + mutex_unlock(&sched_domains_mutex); +#endif + +#ifdef CONFIG_NUMA_BALANCING + numa = debugfs_create_dir("numa_balancing", debugfs_sched); + + debugfs_create_u32("scan_delay_ms", 0644, numa, &sysctl_numa_balancing_scan_delay); + debugfs_create_u32("scan_period_min_ms", 0644, numa, &sysctl_numa_balancing_scan_period_min); + debugfs_create_u32("scan_period_max_ms", 0644, numa, &sysctl_numa_balancing_scan_period_max); + debugfs_create_u32("scan_size_mb", 0644, numa, &sysctl_numa_balancing_scan_size); + debugfs_create_u32("hot_threshold_ms", 0644, numa, &sysctl_numa_balancing_hot_threshold); +#endif + + debugfs_create_file("debug", 0444, debugfs_sched, NULL, &sched_debug_fops); + + debugfs_fair_server_init(); + + return 0; +} +late_initcall(sched_init_debug); + +#ifdef CONFIG_SMP + +static cpumask_var_t sd_sysctl_cpus; + +static int sd_flags_show(struct seq_file *m, void *v) +{ + unsigned long flags = *(unsigned int *)m->private; + int idx; + + for_each_set_bit(idx, &flags, __SD_FLAG_CNT) { + seq_puts(m, sd_flag_debug[idx].name); + seq_puts(m, " "); } + seq_puts(m, "\n"); + + return 0; +} + +static int sd_flags_open(struct inode *inode, struct file *file) +{ + return single_open(file, sd_flags_show, inode->i_private); +} + +static const struct file_operations sd_flags_fops = { + .open = sd_flags_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static void register_sd(struct sched_domain *sd, struct dentry *parent) +{ +#define SDM(type, mode, member) \ + debugfs_create_##type(#member, mode, parent, &sd->member) + + SDM(ulong, 0644, min_interval); + SDM(ulong, 0644, max_interval); + SDM(u64, 0644, max_newidle_lb_cost); + SDM(u32, 0644, busy_factor); + SDM(u32, 0644, imbalance_pct); + SDM(u32, 0644, cache_nice_tries); + SDM(str, 0444, name); + +#undef SDM + + debugfs_create_file("flags", 0444, parent, &sd->flags, &sd_flags_fops); + debugfs_create_file("groups_flags", 0444, parent, &sd->groups->flags, &sd_flags_fops); + debugfs_create_u32("level", 0444, parent, (u32 *)&sd->level); +} + +void update_sched_domain_debugfs(void) +{ + int cpu, i; + + /* + * This can unfortunately be invoked before sched_debug_init() creates + * the debug directory. Don't touch sd_sysctl_cpus until then. + */ + if (!debugfs_sched) + return; + + if (!sched_debug_verbose) + return; if (!cpumask_available(sd_sysctl_cpus)) { if (!alloc_cpumask_var(&sd_sysctl_cpus, GFP_KERNEL)) return; + cpumask_copy(sd_sysctl_cpus, cpu_possible_mask); } - if (!init_done) { - init_done = true; - /* init to possible to not have holes in @cpu_entries */ - cpumask_copy(sd_sysctl_cpus, cpu_possible_mask); + if (!sd_dentry) { + sd_dentry = debugfs_create_dir("domains", debugfs_sched); + + /* rebuild sd_sysctl_cpus if empty since it gets cleared below */ + if (cpumask_empty(sd_sysctl_cpus)) + cpumask_copy(sd_sysctl_cpus, cpu_online_mask); } - for_each_cpu(i, sd_sysctl_cpus) { - struct ctl_table *e = cpu_idx[i]; + for_each_cpu(cpu, sd_sysctl_cpus) { + struct sched_domain *sd; + struct dentry *d_cpu; + char buf[32]; + + snprintf(buf, sizeof(buf), "cpu%d", cpu); + debugfs_lookup_and_remove(buf, sd_dentry); + d_cpu = debugfs_create_dir(buf, sd_dentry); + + i = 0; + for_each_domain(cpu, sd) { + struct dentry *d_sd; - if (e->child) - sd_free_ctl_entry(&e->child); + snprintf(buf, sizeof(buf), "domain%d", i); + d_sd = debugfs_create_dir(buf, d_cpu); - if (!e->procname) { - snprintf(buf, 32, "cpu%d", i); - e->procname = kstrdup(buf, GFP_KERNEL); + register_sd(sd, d_sd); + i++; } - e->mode = 0555; - e->child = sd_alloc_ctl_cpu_table(i); - __cpumask_clear_cpu(i, sd_sysctl_cpus); + __cpumask_clear_cpu(cpu, sd_sysctl_cpus); } - - WARN_ON(sd_sysctl_header); - sd_sysctl_header = register_sysctl_table(sd_ctl_root); } void dirty_sched_domain_sysctl(int cpu) @@ -416,13 +646,6 @@ void dirty_sched_domain_sysctl(int cpu) __cpumask_set_cpu(cpu, sd_sysctl_cpus); } -/* may be called multiple times per register */ -void unregister_sched_domain_sysctl(void) -{ - unregister_sysctl_table(sd_sysctl_header); - sd_sysctl_header = NULL; -} -#endif /* CONFIG_SYSCTL */ #endif /* CONFIG_SMP */ #ifdef CONFIG_FAIR_GROUP_SCHED @@ -431,9 +654,11 @@ static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group struct sched_entity *se = tg->se[cpu]; #define P(F) SEQ_printf(m, " .%-30s: %lld\n", #F, (long long)F) -#define P_SCHEDSTAT(F) SEQ_printf(m, " .%-30s: %lld\n", #F, (long long)schedstat_val(F)) +#define P_SCHEDSTAT(F) SEQ_printf(m, " .%-30s: %lld\n", \ + #F, (long long)schedstat_val(stats->F)) #define PN(F) SEQ_printf(m, " .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F)) -#define PN_SCHEDSTAT(F) SEQ_printf(m, " .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)schedstat_val(F))) +#define PN_SCHEDSTAT(F) SEQ_printf(m, " .%-30s: %lld.%06ld\n", \ + #F, SPLIT_NS((long long)schedstat_val(stats->F))) if (!se) return; @@ -443,16 +668,19 @@ static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group PN(se->sum_exec_runtime); if (schedstat_enabled()) { - PN_SCHEDSTAT(se->statistics.wait_start); - PN_SCHEDSTAT(se->statistics.sleep_start); - PN_SCHEDSTAT(se->statistics.block_start); - PN_SCHEDSTAT(se->statistics.sleep_max); - PN_SCHEDSTAT(se->statistics.block_max); - PN_SCHEDSTAT(se->statistics.exec_max); - PN_SCHEDSTAT(se->statistics.slice_max); - PN_SCHEDSTAT(se->statistics.wait_max); - PN_SCHEDSTAT(se->statistics.wait_sum); - P_SCHEDSTAT(se->statistics.wait_count); + struct sched_statistics *stats; + stats = __schedstats_from_se(se); + + PN_SCHEDSTAT(wait_start); + PN_SCHEDSTAT(sleep_start); + PN_SCHEDSTAT(block_start); + PN_SCHEDSTAT(sleep_max); + PN_SCHEDSTAT(block_max); + PN_SCHEDSTAT(exec_max); + PN_SCHEDSTAT(slice_max); + PN_SCHEDSTAT(wait_max); + PN_SCHEDSTAT(wait_sum); + P_SCHEDSTAT(wait_count); } P(se->load.weight); @@ -470,43 +698,69 @@ static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group #endif #ifdef CONFIG_CGROUP_SCHED +static DEFINE_SPINLOCK(sched_debug_lock); static char group_path[PATH_MAX]; -static char *task_group_path(struct task_group *tg) +static void task_group_path(struct task_group *tg, char *path, int plen) { - if (autogroup_path(tg, group_path, PATH_MAX)) - return group_path; + if (autogroup_path(tg, path, plen)) + return; - cgroup_path(tg->css.cgroup, group_path, PATH_MAX); + cgroup_path(tg->css.cgroup, path, plen); +} - return group_path; +/* + * Only 1 SEQ_printf_task_group_path() caller can use the full length + * group_path[] for cgroup path. Other simultaneous callers will have + * to use a shorter stack buffer. A "..." suffix is appended at the end + * of the stack buffer so that it will show up in case the output length + * matches the given buffer size to indicate possible path name truncation. + */ +#define SEQ_printf_task_group_path(m, tg, fmt...) \ +{ \ + if (spin_trylock(&sched_debug_lock)) { \ + task_group_path(tg, group_path, sizeof(group_path)); \ + SEQ_printf(m, fmt, group_path); \ + spin_unlock(&sched_debug_lock); \ + } else { \ + char buf[128]; \ + char *bufend = buf + sizeof(buf) - 3; \ + task_group_path(tg, buf, bufend - buf); \ + strcpy(bufend - 1, "..."); \ + SEQ_printf(m, fmt, buf); \ + } \ } #endif static void print_task(struct seq_file *m, struct rq *rq, struct task_struct *p) { - if (rq->curr == p) + if (task_current(rq, p)) SEQ_printf(m, ">R"); else SEQ_printf(m, " %c", task_state_to_char(p)); - SEQ_printf(m, " %15s %5d %9Ld.%06ld %9Ld %5d ", + SEQ_printf(m, " %15s %5d %9Ld.%06ld %c %9Ld.%06ld %c %9Ld.%06ld %9Ld.%06ld %9Ld %5d ", p->comm, task_pid_nr(p), SPLIT_NS(p->se.vruntime), + entity_eligible(cfs_rq_of(&p->se), &p->se) ? 'E' : 'N', + SPLIT_NS(p->se.deadline), + p->se.custom_slice ? 'S' : ' ', + SPLIT_NS(p->se.slice), + SPLIT_NS(p->se.sum_exec_runtime), (long long)(p->nvcsw + p->nivcsw), p->prio); - SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld", - SPLIT_NS(schedstat_val_or_zero(p->se.statistics.wait_sum)), - SPLIT_NS(p->se.sum_exec_runtime), - SPLIT_NS(schedstat_val_or_zero(p->se.statistics.sum_sleep_runtime))); + SEQ_printf(m, "%9lld.%06ld %9lld.%06ld %9lld.%06ld", + SPLIT_NS(schedstat_val_or_zero(p->stats.wait_sum)), + SPLIT_NS(schedstat_val_or_zero(p->stats.sum_sleep_runtime)), + SPLIT_NS(schedstat_val_or_zero(p->stats.sum_block_runtime))); #ifdef CONFIG_NUMA_BALANCING - SEQ_printf(m, " %d %d", task_node(p), task_numa_group_id(p)); + SEQ_printf(m, " %d %d", task_node(p), task_numa_group_id(p)); #endif #ifdef CONFIG_CGROUP_SCHED - SEQ_printf(m, " %s", task_group_path(task_group(p))); + SEQ_printf_task_group_path(m, task_group(p), " %s") #endif SEQ_printf(m, "\n"); @@ -518,10 +772,26 @@ static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu) SEQ_printf(m, "\n"); SEQ_printf(m, "runnable tasks:\n"); - SEQ_printf(m, " S task PID tree-key switches prio" - " wait-time sum-exec sum-sleep\n"); + SEQ_printf(m, " S task PID vruntime eligible " + "deadline slice sum-exec switches " + "prio wait-time sum-sleep sum-block" +#ifdef CONFIG_NUMA_BALANCING + " node group-id" +#endif +#ifdef CONFIG_CGROUP_SCHED + " group-path" +#endif + "\n"); SEQ_printf(m, "-------------------------------------------------------" - "------------------------------------------------------\n"); + "------------------------------------------------------" + "------------------------------------------------------" +#ifdef CONFIG_NUMA_BALANCING + "--------------" +#endif +#ifdef CONFIG_CGROUP_SCHED + "--------------" +#endif + "\n"); rcu_read_lock(); for_each_process_thread(g, p) { @@ -535,46 +805,48 @@ static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu) void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) { - s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1, - spread, rq0_min_vruntime, spread0; + s64 left_vruntime = -1, min_vruntime, right_vruntime = -1, left_deadline = -1, spread; + struct sched_entity *last, *first, *root; struct rq *rq = cpu_rq(cpu); - struct sched_entity *last; unsigned long flags; #ifdef CONFIG_FAIR_GROUP_SCHED SEQ_printf(m, "\n"); - SEQ_printf(m, "cfs_rq[%d]:%s\n", cpu, task_group_path(cfs_rq->tg)); + SEQ_printf_task_group_path(m, cfs_rq->tg, "cfs_rq[%d]:%s\n", cpu); #else SEQ_printf(m, "\n"); SEQ_printf(m, "cfs_rq[%d]:\n", cpu); #endif - SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock", - SPLIT_NS(cfs_rq->exec_clock)); - raw_spin_lock_irqsave(&rq->lock, flags); - if (rb_first_cached(&cfs_rq->tasks_timeline)) - MIN_vruntime = (__pick_first_entity(cfs_rq))->vruntime; + raw_spin_rq_lock_irqsave(rq, flags); + root = __pick_root_entity(cfs_rq); + if (root) + left_vruntime = root->min_vruntime; + first = __pick_first_entity(cfs_rq); + if (first) + left_deadline = first->deadline; last = __pick_last_entity(cfs_rq); if (last) - max_vruntime = last->vruntime; + right_vruntime = last->vruntime; min_vruntime = cfs_rq->min_vruntime; - rq0_min_vruntime = cpu_rq(0)->cfs.min_vruntime; - raw_spin_unlock_irqrestore(&rq->lock, flags); - SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "MIN_vruntime", - SPLIT_NS(MIN_vruntime)); + raw_spin_rq_unlock_irqrestore(rq, flags); + + SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "left_deadline", + SPLIT_NS(left_deadline)); + SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "left_vruntime", + SPLIT_NS(left_vruntime)); SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "min_vruntime", SPLIT_NS(min_vruntime)); - SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "max_vruntime", - SPLIT_NS(max_vruntime)); - spread = max_vruntime - MIN_vruntime; - SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread", - SPLIT_NS(spread)); - spread0 = min_vruntime - rq0_min_vruntime; - SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread0", - SPLIT_NS(spread0)); - SEQ_printf(m, " .%-30s: %d\n", "nr_spread_over", - cfs_rq->nr_spread_over); - SEQ_printf(m, " .%-30s: %d\n", "nr_running", cfs_rq->nr_running); + SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "avg_vruntime", + SPLIT_NS(avg_vruntime(cfs_rq))); + SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "right_vruntime", + SPLIT_NS(right_vruntime)); + spread = right_vruntime - left_vruntime; + SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "spread", SPLIT_NS(spread)); + SEQ_printf(m, " .%-30s: %d\n", "nr_queued", cfs_rq->nr_queued); + SEQ_printf(m, " .%-30s: %d\n", "h_nr_runnable", cfs_rq->h_nr_runnable); + SEQ_printf(m, " .%-30s: %d\n", "h_nr_queued", cfs_rq->h_nr_queued); + SEQ_printf(m, " .%-30s: %d\n", "h_nr_idle", cfs_rq->h_nr_idle); SEQ_printf(m, " .%-30s: %ld\n", "load", cfs_rq->load.weight); #ifdef CONFIG_SMP SEQ_printf(m, " .%-30s: %lu\n", "load_avg", @@ -583,8 +855,8 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) cfs_rq->avg.runnable_avg); SEQ_printf(m, " .%-30s: %lu\n", "util_avg", cfs_rq->avg.util_avg); - SEQ_printf(m, " .%-30s: %u\n", "util_est_enqueued", - cfs_rq->avg.util_est.enqueued); + SEQ_printf(m, " .%-30s: %u\n", "util_est", + cfs_rq->avg.util_est); SEQ_printf(m, " .%-30s: %ld\n", "removed.load_avg", cfs_rq->removed.load_avg); SEQ_printf(m, " .%-30s: %ld\n", "removed.util_avg", @@ -614,7 +886,7 @@ void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq) { #ifdef CONFIG_RT_GROUP_SCHED SEQ_printf(m, "\n"); - SEQ_printf(m, "rt_rq[%d]:%s\n", cpu, task_group_path(rt_rq->tg)); + SEQ_printf_task_group_path(m, rt_rq->tg, "rt_rq[%d]:%s\n", cpu); #else SEQ_printf(m, "\n"); SEQ_printf(m, "rt_rq[%d]:\n", cpu); @@ -628,12 +900,12 @@ void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq) SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x)) PU(rt_nr_running); -#ifdef CONFIG_SMP - PU(rt_nr_migratory); -#endif + +#ifdef CONFIG_RT_GROUP_SCHED P(rt_throttled); PN(rt_time); PN(rt_runtime); +#endif #undef PN #undef PU @@ -652,7 +924,6 @@ void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq) PU(dl_nr_running); #ifdef CONFIG_SMP - PU(dl_nr_migratory); dl_bw = &cpu_rq(cpu)->rd->dl_bw; #else dl_bw = &dl_rq->dl_bw; @@ -666,7 +937,6 @@ void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq) static void print_cpu(struct seq_file *m, int cpu) { struct rq *rq = cpu_rq(cpu); - unsigned long flags; #ifdef CONFIG_X86 { @@ -682,7 +952,7 @@ static void print_cpu(struct seq_file *m, int cpu) #define P(x) \ do { \ if (sizeof(rq->x) == 4) \ - SEQ_printf(m, " .%-30s: %ld\n", #x, (long)(rq->x)); \ + SEQ_printf(m, " .%-30s: %d\n", #x, (int)(rq->x)); \ else \ SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x));\ } while (0) @@ -717,13 +987,11 @@ do { \ } #undef P - spin_lock_irqsave(&sched_debug_lock, flags); print_cfs_stats(m, cpu); print_rt_stats(m, cpu); print_dl_stats(m, cpu); print_rq(m, rq, cpu); - spin_unlock_irqrestore(&sched_debug_lock, flags); SEQ_printf(m, "\n"); } @@ -770,10 +1038,7 @@ static void sched_debug_header(struct seq_file *m) SEQ_printf(m, " .%-40s: %Ld\n", #x, (long long)(x)) #define PN(x) \ SEQ_printf(m, " .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x)) - PN(sysctl_sched_latency); - PN(sysctl_sched_min_granularity); - PN(sysctl_sched_wakeup_granularity); - P(sysctl_sched_child_runs_first); + PN(sysctl_sched_base_slice); P(sysctl_sched_features); #undef PN #undef P @@ -815,7 +1080,7 @@ void sysrq_sched_debug_show(void) } /* - * This itererator needs some explanation. + * This iterator needs some explanation. * It returns 1 for the header position. * This means 2 is CPU 0. * In a hotplugged system some CPUs, including CPU 0, may be missing so we have @@ -860,18 +1125,10 @@ static const struct seq_operations sched_debug_sops = { .show = sched_debug_show, }; -static int __init init_sched_debug_procfs(void) -{ - if (!proc_create_seq("sched_debug", 0444, NULL, &sched_debug_sops)) - return -ENOMEM; - return 0; -} - -__initcall(init_sched_debug_procfs); - #define __PS(S, F) SEQ_printf(m, "%-45s:%21Ld\n", S, (long long)(F)) #define __P(F) __PS(#F, F) #define P(F) __PS(#F, p->F) +#define PM(F, M) __PS(#F, p->F & (M)) #define __PSN(S, F) SEQ_printf(m, "%-45s:%14Ld.%06ld\n", S, SPLIT_NS((long long)(F))) #define __PN(F) __PSN(#F, F) #define PN(F) __PSN(#F, p->F) @@ -891,25 +1148,15 @@ void print_numa_stats(struct seq_file *m, int node, unsigned long tsf, static void sched_show_numa(struct task_struct *p, struct seq_file *m) { #ifdef CONFIG_NUMA_BALANCING - struct mempolicy *pol; - if (p->mm) P(mm->numa_scan_seq); - task_lock(p); - pol = p->mempolicy; - if (pol && !(pol->flags & MPOL_F_MORON)) - pol = NULL; - mpol_get(pol); - task_unlock(p); - P(numa_pages_migrated); P(numa_preferred_nid); P(total_numa_faults); SEQ_printf(m, "current_node=%d, numa_group_id=%d\n", task_node(p), task_numa_group_id(p)); show_numa_stats(p, m); - mpol_put(pol); #endif } @@ -924,8 +1171,8 @@ void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns, "---------------------------------------------------------" "----------\n"); -#define P_SCHEDSTAT(F) __PS(#F, schedstat_val(p->F)) -#define PN_SCHEDSTAT(F) __PSN(#F, schedstat_val(p->F)) +#define P_SCHEDSTAT(F) __PS(#F, schedstat_val(p->stats.F)) +#define PN_SCHEDSTAT(F) __PSN(#F, schedstat_val(p->stats.F)) PN(se.exec_start); PN(se.vruntime); @@ -938,33 +1185,34 @@ void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns, if (schedstat_enabled()) { u64 avg_atom, avg_per_cpu; - PN_SCHEDSTAT(se.statistics.sum_sleep_runtime); - PN_SCHEDSTAT(se.statistics.wait_start); - PN_SCHEDSTAT(se.statistics.sleep_start); - PN_SCHEDSTAT(se.statistics.block_start); - PN_SCHEDSTAT(se.statistics.sleep_max); - PN_SCHEDSTAT(se.statistics.block_max); - PN_SCHEDSTAT(se.statistics.exec_max); - PN_SCHEDSTAT(se.statistics.slice_max); - PN_SCHEDSTAT(se.statistics.wait_max); - PN_SCHEDSTAT(se.statistics.wait_sum); - P_SCHEDSTAT(se.statistics.wait_count); - PN_SCHEDSTAT(se.statistics.iowait_sum); - P_SCHEDSTAT(se.statistics.iowait_count); - P_SCHEDSTAT(se.statistics.nr_migrations_cold); - P_SCHEDSTAT(se.statistics.nr_failed_migrations_affine); - P_SCHEDSTAT(se.statistics.nr_failed_migrations_running); - P_SCHEDSTAT(se.statistics.nr_failed_migrations_hot); - P_SCHEDSTAT(se.statistics.nr_forced_migrations); - P_SCHEDSTAT(se.statistics.nr_wakeups); - P_SCHEDSTAT(se.statistics.nr_wakeups_sync); - P_SCHEDSTAT(se.statistics.nr_wakeups_migrate); - P_SCHEDSTAT(se.statistics.nr_wakeups_local); - P_SCHEDSTAT(se.statistics.nr_wakeups_remote); - P_SCHEDSTAT(se.statistics.nr_wakeups_affine); - P_SCHEDSTAT(se.statistics.nr_wakeups_affine_attempts); - P_SCHEDSTAT(se.statistics.nr_wakeups_passive); - P_SCHEDSTAT(se.statistics.nr_wakeups_idle); + PN_SCHEDSTAT(sum_sleep_runtime); + PN_SCHEDSTAT(sum_block_runtime); + PN_SCHEDSTAT(wait_start); + PN_SCHEDSTAT(sleep_start); + PN_SCHEDSTAT(block_start); + PN_SCHEDSTAT(sleep_max); + PN_SCHEDSTAT(block_max); + PN_SCHEDSTAT(exec_max); + PN_SCHEDSTAT(slice_max); + PN_SCHEDSTAT(wait_max); + PN_SCHEDSTAT(wait_sum); + P_SCHEDSTAT(wait_count); + PN_SCHEDSTAT(iowait_sum); + P_SCHEDSTAT(iowait_count); + P_SCHEDSTAT(nr_migrations_cold); + P_SCHEDSTAT(nr_failed_migrations_affine); + P_SCHEDSTAT(nr_failed_migrations_running); + P_SCHEDSTAT(nr_failed_migrations_hot); + P_SCHEDSTAT(nr_forced_migrations); + P_SCHEDSTAT(nr_wakeups); + P_SCHEDSTAT(nr_wakeups_sync); + P_SCHEDSTAT(nr_wakeups_migrate); + P_SCHEDSTAT(nr_wakeups_local); + P_SCHEDSTAT(nr_wakeups_remote); + P_SCHEDSTAT(nr_wakeups_affine); + P_SCHEDSTAT(nr_wakeups_affine_attempts); + P_SCHEDSTAT(nr_wakeups_passive); + P_SCHEDSTAT(nr_wakeups_idle); avg_atom = p->se.sum_exec_runtime; if (nr_switches) @@ -982,6 +1230,10 @@ void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns, __PN(avg_atom); __PN(avg_per_cpu); + +#ifdef CONFIG_SCHED_CORE + PN_SCHEDSTAT(core_forceidle_sum); +#endif } __P(nr_switches); @@ -997,8 +1249,7 @@ void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns, P(se.avg.runnable_avg); P(se.avg.util_avg); P(se.avg.last_update_time); - P(se.avg.util_est.ewma); - P(se.avg.util_est.enqueued); + PM(se.avg.util_est, ~UTIL_AVG_UNCHANGED); #endif #ifdef CONFIG_UCLAMP_TASK __PS("uclamp.min", p->uclamp_req[UCLAMP_MIN].value); @@ -1011,7 +1262,12 @@ void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns, if (task_has_dl_policy(p)) { P(dl.runtime); P(dl.deadline); + } else if (fair_policy(p->policy)) { + P(se.slice); } +#ifdef CONFIG_SCHED_CLASS_EXT + __PS("ext.enabled", task_on_scx(p)); +#endif #undef PN_SCHEDSTAT #undef P_SCHEDSTAT @@ -1030,6 +1286,18 @@ void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns, void proc_sched_set_task(struct task_struct *p) { #ifdef CONFIG_SCHEDSTATS - memset(&p->se.statistics, 0, sizeof(p->se.statistics)); + memset(&p->stats, 0, sizeof(p->stats)); #endif } + +void resched_latency_warn(int cpu, u64 latency) +{ + static DEFINE_RATELIMIT_STATE(latency_check_ratelimit, 60 * 60 * HZ, 1); + + if (likely(!__ratelimit(&latency_check_ratelimit))) + return; + + pr_err("sched: CPU %d need_resched set for > %llu ns (%d ticks) without schedule\n", + cpu, latency, cpu_rq(cpu)->ticks_without_resched); + dump_stack(); +} |