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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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SPDX-License-Identifier: GPL-2.0-only/* * kernel/sched/debug.c * * Print the CFS rbtree and other debugging details * * Copyright(C) 2007, Red Hat, Inc., Ingo Molnar */#include <linux/debugfs.h>#include <linux/nmi.h>#include <linux/log2.h>#include "sched.h"
/* * This allows printing both to /sys/kernel/debug/sched/debug and * to the console */#define SEQ_printf(m, x...) \ do { \ if (m) \ seq_printf(m, x); \ else \ pr_cont(x); \ } while (0)
/* * Ease the printing of nsec fields: */static long long nsec_high(unsigned long long nsec){ if ((long long)nsec < 0) { nsec = -nsec; do_div(nsec, 1000000); return -nsec; } do_div(nsec, 1000000);
return nsec;}
static unsigned long nsec_low(unsigned long long nsec){ if ((long long)nsec < 0) nsec = -nsec;
return do_div(nsec, 1000000);}
#define SPLIT_NS(x) nsec_high(x), nsec_low(x)
#define SCHED_FEAT(name, enabled) \ #name ,
static const char * const sched_feat_names[] = {#include "features.h"};
#undef SCHED_FEAT
static int sched_feat_show(struct seq_file *m, void *v){ int i;
for (i = 0; i < __SCHED_FEAT_NR; i++) { if (!(sysctl_sched_features & (1UL << i))) seq_puts(m, "NO_"); seq_printf(m, "%s ", sched_feat_names[i]); } seq_puts(m, "\n");
return 0;}
#ifdef CONFIG_JUMP_LABEL
#define jump_label_key__true STATIC_KEY_INIT_TRUE#define jump_label_key__false STATIC_KEY_INIT_FALSE
#define SCHED_FEAT(name, enabled) \ jump_label_key__##enabled ,
struct static_key sched_feat_keys[__SCHED_FEAT_NR] = {#include "features.h"};
#undef SCHED_FEAT
static void sched_feat_disable(int i){ static_key_disable_cpuslocked(&sched_feat_keys[i]);}
static void sched_feat_enable(int i){ static_key_enable_cpuslocked(&sched_feat_keys[i]);}#else /* !CONFIG_JUMP_LABEL: */static void sched_feat_disable(int i) { };static void sched_feat_enable(int i) { };#endif /* !CONFIG_JUMP_LABEL */
static int sched_feat_set(char *cmp){ int i; int neg = 0;
if (strncmp(cmp, "NO_", 3) == 0) { neg = 1; cmp += 3; }
i = match_string(sched_feat_names, __SCHED_FEAT_NR, cmp); if (i < 0) return i;
if (neg) { sysctl_sched_features &= ~(1UL << i); sched_feat_disable(i); } else { sysctl_sched_features |= (1UL << i); sched_feat_enable(i); }
return 0;}
static ssize_tsched_feat_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos){ char buf[64]; char *cmp; int ret; struct inode *inode;
if (cnt > 63) cnt = 63;
if (copy_from_user(buf, ubuf, cnt)) return -EFAULT;
buf[cnt] = 0; cmp = strstrip(buf);
/* Ensure the static_key remains in a consistent state */ inode = file_inode(filp); cpus_read_lock(); inode_lock(inode); ret = sched_feat_set(cmp); inode_unlock(inode); cpus_read_unlock(); if (ret < 0) return ret;
*ppos += cnt;
return cnt;}
static int sched_feat_open(struct inode *inode, struct file *filp){ return single_open(filp, sched_feat_show, NULL);}
static const struct file_operations sched_feat_fops = { .open = sched_feat_open, .write = sched_feat_write, .read = seq_read, .llseek = seq_lseek, .release = single_release,};
static ssize_t sched_scaling_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos){ unsigned int scaling; int ret;
ret = kstrtouint_from_user(ubuf, cnt, 10, &scaling); if (ret) return ret;
if (scaling >= SCHED_TUNABLESCALING_END) return -EINVAL;
sysctl_sched_tunable_scaling = scaling; if (sched_update_scaling()) return -EINVAL;
*ppos += cnt; return cnt;}
static int sched_scaling_show(struct seq_file *m, void *v){ seq_printf(m, "%d\n", sysctl_sched_tunable_scaling); return 0;}
static int sched_scaling_open(struct inode *inode, struct file *filp){ return single_open(filp, sched_scaling_show, NULL);}
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,};
#ifdef CONFIG_SCHED_CACHEstatic ssize_tsched_cache_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos){ bool val; int ret;
ret = kstrtobool_from_user(ubuf, cnt, &val); if (ret) return ret;
sysctl_sched_cache_user = val;
sched_cache_active_set();
*ppos += cnt;
return cnt;}
static int sched_cache_enable_show(struct seq_file *m, void *v){ seq_printf(m, "%d\n", sysctl_sched_cache_user); return 0;}
static int sched_cache_enable_open(struct inode *inode, struct file *filp){ return single_open(filp, sched_cache_enable_show, NULL);}
static const struct file_operations sched_cache_enable_fops = { .open = sched_cache_enable_open, .write = sched_cache_enable_write, .read = seq_read, .llseek = seq_lseek, .release = single_release,};#endif
#ifdef CONFIG_PREEMPT_DYNAMIC
static ssize_t sched_dynamic_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos){ char buf[16]; int mode;
if (cnt > 15) cnt = 15;
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 int sched_dynamic_show(struct seq_file *m, void *v){ int i = (IS_ENABLED(CONFIG_PREEMPT_RT) || IS_ENABLED(CONFIG_ARCH_HAS_PREEMPT_LAZY)) * 2; int mode = READ_ONCE(preempt_dynamic_mode); int j;
/* Count entries in NULL terminated preempt_modes */ for (j = 0; preempt_modes[j]; j++) ; j -= !IS_ENABLED(CONFIG_ARCH_HAS_PREEMPT_LAZY);
for (; i < j; i++) { if (mode == i) seq_puts(m, "("); seq_puts(m, preempt_modes[i]); if (mode == i) seq_puts(m, ")");
seq_puts(m, " "); }
seq_puts(m, "\n"); return 0;}
static int sched_dynamic_open(struct inode *inode, struct file *filp){ return single_open(filp, sched_dynamic_show, NULL);}
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;
static struct dentry *sd_dentry;
static ssize_t sched_verbose_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos){ ssize_t result; bool orig;
cpus_read_lock(); sched_domains_mutex_lock();
orig = sched_debug_verbose; result = debugfs_write_file_bool(filp, ubuf, cnt, ppos);
if (sched_debug_verbose && !orig) update_sched_domain_debugfs(); else if (!sched_debug_verbose && orig) { debugfs_remove(sd_dentry); sd_dentry = NULL; }
sched_domains_mutex_unlock(); cpus_read_unlock();
return result;}
static const struct file_operations sched_verbose_fops = { .read = debugfs_read_file_bool, .write = sched_verbose_write, .open = simple_open, .llseek = default_llseek,};
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 dl_server_period_max = (1UL << 22) * NSEC_PER_USEC; /* ~4 seconds */static unsigned long dl_server_period_min = (100) * NSEC_PER_USEC; /* 100 us */
static ssize_t sched_server_write_common(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos, enum dl_param param, void *server){ long cpu = (long) ((struct seq_file *) filp->private_data)->private; struct sched_dl_entity *dl_se = (struct sched_dl_entity *)server; u64 old_runtime, runtime, period; struct rq *rq = cpu_rq(cpu); int retval = 0; size_t err; u64 value;
err = kstrtoull_from_user(ubuf, cnt, 10, &value); if (err) return err;
scoped_guard (rq_lock_irqsave, rq) { old_runtime = runtime = dl_se->dl_runtime; period = dl_se->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 > dl_server_period_max || period < dl_server_period_min) { return -EINVAL; }
if (!cpu_online(cpu_of(rq))) return -EBUSY;
update_rq_clock(rq); dl_server_stop(dl_se); retval = dl_server_apply_params(dl_se, runtime, period, 0); dl_server_start(dl_se);
if (retval < 0) return retval; }
if (!!old_runtime ^ !!runtime) { pr_info("%s server %sabled on CPU %d%s.\n", server == &rq->fair_server ? "Fair" : "Ext", runtime ? "en" : "dis", cpu_of(rq), runtime ? "" : ", system may malfunction due to starvation"); }
*ppos += cnt; return cnt;}
static size_t sched_server_show_common(struct seq_file *m, void *v, enum dl_param param, void *server){ struct sched_dl_entity *dl_se = (struct sched_dl_entity *)server; u64 value;
switch (param) { case DL_RUNTIME: value = dl_se->dl_runtime; break; case DL_PERIOD: value = dl_se->dl_period; break; }
seq_printf(m, "%llu\n", value); return 0;}
static ssize_tsched_fair_server_runtime_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos){ long cpu = (long) ((struct seq_file *) filp->private_data)->private; struct rq *rq = cpu_rq(cpu);
return sched_server_write_common(filp, ubuf, cnt, ppos, DL_RUNTIME, &rq->fair_server);}
static int sched_fair_server_runtime_show(struct seq_file *m, void *v){ unsigned long cpu = (unsigned long) m->private; struct rq *rq = cpu_rq(cpu);
return sched_server_show_common(m, v, DL_RUNTIME, &rq->fair_server);}
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);}
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 struct dentry *debugfs_sched;
#ifdef CONFIG_SCHED_CLASS_EXTstatic ssize_tsched_ext_server_runtime_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos){ long cpu = (long) ((struct seq_file *) filp->private_data)->private; struct rq *rq = cpu_rq(cpu);
return sched_server_write_common(filp, ubuf, cnt, ppos, DL_RUNTIME, &rq->ext_server);}
static int sched_ext_server_runtime_show(struct seq_file *m, void *v){ unsigned long cpu = (unsigned long) m->private; struct rq *rq = cpu_rq(cpu);
return sched_server_show_common(m, v, DL_RUNTIME, &rq->ext_server);}
static int sched_ext_server_runtime_open(struct inode *inode, struct file *filp){ return single_open(filp, sched_ext_server_runtime_show, inode->i_private);}
static const struct file_operations ext_server_runtime_fops = { .open = sched_ext_server_runtime_open, .write = sched_ext_server_runtime_write, .read = seq_read, .llseek = seq_lseek, .release = single_release,};
static ssize_tsched_ext_server_period_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos){ long cpu = (long) ((struct seq_file *) filp->private_data)->private; struct rq *rq = cpu_rq(cpu);
return sched_server_write_common(filp, ubuf, cnt, ppos, DL_PERIOD, &rq->ext_server);}
static int sched_ext_server_period_show(struct seq_file *m, void *v){ unsigned long cpu = (unsigned long) m->private; struct rq *rq = cpu_rq(cpu);
return sched_server_show_common(m, v, DL_PERIOD, &rq->ext_server);}
static int sched_ext_server_period_open(struct inode *inode, struct file *filp){ return single_open(filp, sched_ext_server_period_show, inode->i_private);}
static const struct file_operations ext_server_period_fops = { .open = sched_ext_server_period_open, .write = sched_ext_server_period_write, .read = seq_read, .llseek = seq_lseek, .release = single_release,};
static void debugfs_ext_server_init(void){ struct dentry *d_ext; unsigned long cpu;
d_ext = debugfs_create_dir("ext_server", debugfs_sched); if (!d_ext) 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_ext);
debugfs_create_file("runtime", 0644, d_cpu, (void *) cpu, &ext_server_runtime_fops); debugfs_create_file("period", 0644, d_cpu, (void *) cpu, &ext_server_period_fops); }}#endif /* CONFIG_SCHED_CLASS_EXT */
static ssize_tsched_fair_server_period_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos){ long cpu = (long) ((struct seq_file *) filp->private_data)->private; struct rq *rq = cpu_rq(cpu);
return sched_server_write_common(filp, ubuf, cnt, ppos, DL_PERIOD, &rq->fair_server);}
static int sched_fair_server_period_show(struct seq_file *m, void *v){ unsigned long cpu = (unsigned long) m->private; struct rq *rq = cpu_rq(cpu);
return sched_server_show_common(m, v, DL_PERIOD, &rq->fair_server);}
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);}
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 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); }}
static __init int sched_init_debug(void){ struct dentry __maybe_unused *numa, *llc;
debugfs_sched = debugfs_create_dir("sched", NULL);
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);
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);
sched_domains_mutex_lock(); update_sched_domain_debugfs(); sched_domains_mutex_unlock();
#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 /* CONFIG_NUMA_BALANCING */
#ifdef CONFIG_SCHED_CACHE llc = debugfs_create_dir("llc_balancing", debugfs_sched); debugfs_create_file("enabled", 0644, llc, NULL, &sched_cache_enable_fops); debugfs_create_u32("aggr_tolerance", 0644, llc, &llc_aggr_tolerance); debugfs_create_u32("epoch_period", 0644, llc, &llc_epoch_period); debugfs_create_u32("epoch_affinity_timeout", 0644, llc, &llc_epoch_affinity_timeout); debugfs_create_u32("overaggr_pct", 0644, llc, &llc_overaggr_pct); debugfs_create_u32("imb_pct", 0644, llc, &llc_imb_pct);#endif
debugfs_create_file("debug", 0444, debugfs_sched, NULL, &sched_debug_fops);
debugfs_fair_server_init();#ifdef CONFIG_SCHED_CLASS_EXT debugfs_ext_server_init();#endif
return 0;}late_initcall(sched_init_debug);
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);
if (sd->flags & SD_ASYM_PACKING) debugfs_create_u32("group_asym_prefer_cpu", 0444, parent, (u32 *)&sd->groups->asym_prefer_cpu);}
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 (!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(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;
snprintf(buf, sizeof(buf), "domain%d", i); d_sd = debugfs_create_dir(buf, d_cpu);
register_sd(sd, d_sd); i++; }
__cpumask_clear_cpu(cpu, sd_sysctl_cpus); }}
void dirty_sched_domain_sysctl(int cpu){ if (cpumask_available(sd_sysctl_cpus)) __cpumask_set_cpu(cpu, sd_sysctl_cpus);}
#ifdef CONFIG_FAIR_GROUP_SCHEDstatic void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group *tg){ struct sched_entity *se = tg_se(tg, 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(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(stats->F)))
if (!se) return;
PN(se->exec_start); PN(se->vruntime); PN(se->sum_exec_runtime);
if (schedstat_enabled()) { 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); P(se->avg.load_avg); P(se->avg.util_avg); P(se->avg.runnable_avg);
#undef PN_SCHEDSTAT#undef PN#undef P_SCHEDSTAT#undef P}#endif /* CONFIG_FAIR_GROUP_SCHED */
#ifdef CONFIG_CGROUP_SCHEDstatic DEFINE_SPINLOCK(sched_debug_lock);static char group_path[PATH_MAX];
static void task_group_path(struct task_group *tg, char *path, int plen){ if (autogroup_path(tg, path, plen)) return;
cgroup_path(tg->css.cgroup, path, plen);}
/* * 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 voidprint_task(struct seq_file *m, struct rq *rq, struct task_struct *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 %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, "%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));#endif#ifdef CONFIG_CGROUP_SCHED SEQ_printf_task_group_path(m, task_group(p), " %s")#endif
SEQ_printf(m, "\n");}
static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu){ struct task_struct *g, *p;
SEQ_printf(m, "\n"); SEQ_printf(m, "runnable tasks:\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, "-------------------------------------------------------" "------------------------------------------------------" "------------------------------------------------------"#ifdef CONFIG_NUMA_BALANCING "--------------"#endif#ifdef CONFIG_CGROUP_SCHED "--------------"#endif "\n");
rcu_read_lock(); for_each_process_thread(g, p) { if (task_cpu(p) != rq_cpu) continue;
print_task(m, rq, p); } rcu_read_unlock();}
void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq){ s64 left_vruntime = -1, right_vruntime = -1, left_deadline = -1, spread; s64 zero_vruntime = -1, sum_w_vruntime = -1; u64 avruntime; struct sched_entity *last, *first, *root; struct rq *rq = cpu_rq(cpu); unsigned int sum_shift; unsigned long flags; u64 sum_weight;
#ifdef CONFIG_FAIR_GROUP_SCHED SEQ_printf(m, "\n"); 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
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) right_vruntime = last->vruntime; zero_vruntime = cfs_rq->zero_vruntime; sum_w_vruntime = cfs_rq->sum_w_vruntime; sum_weight = cfs_rq->sum_weight; sum_shift = cfs_rq->sum_shift; avruntime = avg_vruntime(cfs_rq); 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", "zero_vruntime", SPLIT_NS(zero_vruntime)); SEQ_printf(m, " .%-30s: %Ld (%d bits)\n", "sum_w_vruntime", sum_w_vruntime, ilog2(abs(sum_w_vruntime))); SEQ_printf(m, " .%-30s: %Lu\n", "sum_weight", sum_weight); SEQ_printf(m, " .%-30s: %u\n", "sum_shift", sum_shift); SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "avg_vruntime", SPLIT_NS(avruntime)); 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); SEQ_printf(m, " .%-30s: %lu\n", "load_avg", cfs_rq->avg.load_avg); SEQ_printf(m, " .%-30s: %lu\n", "runnable_avg", 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", 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", cfs_rq->removed.util_avg); SEQ_printf(m, " .%-30s: %ld\n", "removed.runnable_avg", cfs_rq->removed.runnable_avg);#ifdef CONFIG_FAIR_GROUP_SCHED SEQ_printf(m, " .%-30s: %lu\n", "tg_load_avg_contrib", cfs_rq->tg_load_avg_contrib); SEQ_printf(m, " .%-30s: %ld\n", "tg_load_avg", atomic_long_read(&cfs_rq->tg->load_avg));#endif /* CONFIG_FAIR_GROUP_SCHED */#ifdef CONFIG_CFS_BANDWIDTH SEQ_printf(m, " .%-30s: %d\n", "throttled", cfs_rq->throttled); SEQ_printf(m, " .%-30s: %d\n", "throttle_count", cfs_rq->throttle_count);#endif
#ifdef CONFIG_FAIR_GROUP_SCHED print_cfs_group_stats(m, cpu, cfs_rq->tg);#endif}
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_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);#endif
#define P(x) \ SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rt_rq->x))#define PU(x) \ SEQ_printf(m, " .%-30s: %lu\n", #x, (unsigned long)(rt_rq->x))#define PN(x) \ SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rt_rq->x))
PU(rt_nr_running);
#ifdef CONFIG_RT_GROUP_SCHED P(rt_throttled); PN(rt_time); PN(rt_runtime);#endif
#undef PN#undef PU#undef P}
void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq){ struct dl_bw *dl_bw;
SEQ_printf(m, "\n"); SEQ_printf(m, "dl_rq[%d]:\n", cpu);
#define PU(x) \ SEQ_printf(m, " .%-30s: %lu\n", #x, (unsigned long)(dl_rq->x))
PU(dl_nr_running); dl_bw = &cpu_rq(cpu)->rd->dl_bw; SEQ_printf(m, " .%-30s: %lld\n", "dl_bw->bw", dl_bw->bw); SEQ_printf(m, " .%-30s: %lld\n", "dl_bw->total_bw", dl_bw->total_bw);
#undef PU}
static void print_cpu(struct seq_file *m, int cpu){ struct rq *rq = cpu_rq(cpu);
#ifdef CONFIG_X86 { unsigned int freq = cpu_khz ? : 1;
SEQ_printf(m, "cpu#%d, %u.%03u MHz\n", cpu, freq / 1000, (freq % 1000)); }#else /* !CONFIG_X86: */ SEQ_printf(m, "cpu#%d\n", cpu);#endif /* !CONFIG_X86 */
#define P(x) \do { \ if (sizeof(rq->x) == 4) \ SEQ_printf(m, " .%-30s: %d\n", #x, (int)(rq->x)); \ else \ SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x));\} while (0)
#define PN(x) \ SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(rq->x))
P(nr_running); P(nr_switches); P(nr_uninterruptible); PN(next_balance); SEQ_printf(m, " .%-30s: %ld\n", "curr->pid", (long)(task_pid_nr(rq->curr))); PN(clock); PN(clock_task);#undef P#undef PN
#define P64(n) SEQ_printf(m, " .%-30s: %Ld\n", #n, rq->n); P64(avg_idle); P64(max_idle_balance_cost);#undef P64
#define P(n) SEQ_printf(m, " .%-30s: %d\n", #n, schedstat_val(rq->n)); if (schedstat_enabled()) { P(yld_count); P(sched_count); P(sched_goidle); P(ttwu_count); P(ttwu_local); }#undef P
print_cfs_stats(m, cpu); print_rt_stats(m, cpu); print_dl_stats(m, cpu);
print_rq(m, rq, cpu); SEQ_printf(m, "\n");}
static const char *sched_tunable_scaling_names[] = { "none", "logarithmic", "linear"};
static void sched_debug_header(struct seq_file *m){ u64 ktime, sched_clk, cpu_clk; unsigned long flags;
local_irq_save(flags); ktime = ktime_to_ns(ktime_get()); sched_clk = sched_clock(); cpu_clk = local_clock(); local_irq_restore(flags);
SEQ_printf(m, "Sched Debug Version: v0.11, %s %.*s\n", init_utsname()->release, (int)strcspn(init_utsname()->version, " "), init_utsname()->version);
#define P(x) \ 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(ktime); PN(sched_clk); PN(cpu_clk); P(jiffies);#ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK P(sched_clock_stable());#endif#undef PN#undef P
SEQ_printf(m, "\n"); SEQ_printf(m, "sysctl_sched\n");
#define P(x) \ 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_base_slice); P(sysctl_sched_features);#undef PN#undef P
SEQ_printf(m, " .%-40s: %d (%s)\n", "sysctl_sched_tunable_scaling", sysctl_sched_tunable_scaling, sched_tunable_scaling_names[sysctl_sched_tunable_scaling]); SEQ_printf(m, "\n");}
static int sched_debug_show(struct seq_file *m, void *v){ int cpu = (unsigned long)(v - 2);
if (cpu != -1) print_cpu(m, cpu); else sched_debug_header(m);
return 0;}
void sysrq_sched_debug_show(void){ int cpu;
sched_debug_header(NULL); for_each_online_cpu(cpu) { /* * Need to reset softlockup watchdogs on all CPUs, because * another CPU might be blocked waiting for us to process * an IPI or stop_machine. */ touch_nmi_watchdog(); touch_all_softlockup_watchdogs(); print_cpu(NULL, cpu); }}
/* * 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 * to use cpumask_* to iterate over the CPUs. */static void *sched_debug_start(struct seq_file *file, loff_t *offset){ unsigned long n = *offset;
if (n == 0) return (void *) 1;
n--;
if (n > 0) n = cpumask_next(n - 1, cpu_online_mask); else n = cpumask_first(cpu_online_mask);
*offset = n + 1;
if (n < nr_cpu_ids) return (void *)(unsigned long)(n + 2);
return NULL;}
static void *sched_debug_next(struct seq_file *file, void *data, loff_t *offset){ (*offset)++; return sched_debug_start(file, offset);}
static void sched_debug_stop(struct seq_file *file, void *data){}
static const struct seq_operations sched_debug_sops = { .start = sched_debug_start, .next = sched_debug_next, .stop = sched_debug_stop, .show = sched_debug_show,};
#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)
#ifdef CONFIG_NUMA_BALANCINGvoid print_numa_stats(struct seq_file *m, int node, unsigned long tsf, unsigned long tpf, unsigned long gsf, unsigned long gpf){ SEQ_printf(m, "numa_faults node=%d ", node); SEQ_printf(m, "task_private=%lu task_shared=%lu ", tpf, tsf); SEQ_printf(m, "group_private=%lu group_shared=%lu\n", gpf, gsf);}#endif
static void sched_show_numa(struct task_struct *p, struct seq_file *m){#ifdef CONFIG_NUMA_BALANCING if (p->mm) P(mm->numa_scan_seq);
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);#endif /* CONFIG_NUMA_BALANCING */}
void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns, struct seq_file *m){ unsigned long nr_switches;
SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, task_pid_nr_ns(p, ns), get_nr_threads(p)); SEQ_printf(m, "---------------------------------------------------------" "----------\n");
#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); PN(se.sum_exec_runtime);
nr_switches = p->nvcsw + p->nivcsw;
P(se.nr_migrations);
if (schedstat_enabled()) { u64 avg_atom, avg_per_cpu;
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) avg_atom = div64_ul(avg_atom, nr_switches); else avg_atom = -1LL;
avg_per_cpu = p->se.sum_exec_runtime; if (p->se.nr_migrations) { avg_per_cpu = div64_u64(avg_per_cpu, p->se.nr_migrations); } else { avg_per_cpu = -1LL; }
__PN(avg_atom); __PN(avg_per_cpu);
#ifdef CONFIG_SCHED_CORE PN_SCHEDSTAT(core_forceidle_sum);#endif }
__P(nr_switches); __PS("nr_voluntary_switches", p->nvcsw); __PS("nr_involuntary_switches", p->nivcsw);
P(se.load.weight); P(se.avg.load_sum); P(se.avg.runnable_sum); P(se.avg.util_sum); P(se.avg.load_avg); P(se.avg.runnable_avg); P(se.avg.util_avg); P(se.avg.last_update_time); PM(se.avg.util_est, ~UTIL_AVG_UNCHANGED);#ifdef CONFIG_UCLAMP_TASK __PS("uclamp.min", p->uclamp_req[UCLAMP_MIN].value); __PS("uclamp.max", p->uclamp_req[UCLAMP_MAX].value); __PS("effective uclamp.min", uclamp_eff_value(p, UCLAMP_MIN)); __PS("effective uclamp.max", uclamp_eff_value(p, UCLAMP_MAX));#endif /* CONFIG_UCLAMP_TASK */ P(policy); P(prio); 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
{ unsigned int this_cpu = raw_smp_processor_id(); u64 t0, t1;
t0 = cpu_clock(this_cpu); t1 = cpu_clock(this_cpu); __PS("clock-delta", t1-t0); }
sched_show_numa(p, m);}
void proc_sched_set_task(struct task_struct *p){#ifdef CONFIG_SCHEDSTATS 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();}