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sched: Move SCHED_DEBUG sysctl to debugfs
Stop polluting sysctl with undocumented knobs that really are debug only, move them all to /debug/sched/ along with the existing /debug/sched_* files that already exist. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Tested-by: Valentin Schneider <valentin.schneider@arm.com> Link: https://lkml.kernel.org/r/20210412102001.287610138@infradead.org
This commit is contained in:
Peter Zijlstra
parent
d86ba83165
commit
8a99b6833c
6 changed files with 80 additions and 113 deletions
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@ -26,10 +26,11 @@ int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
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enum { sysctl_hung_task_timeout_secs = 0 };
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#endif
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extern unsigned int sysctl_sched_child_runs_first;
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extern unsigned int sysctl_sched_latency;
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extern unsigned int sysctl_sched_min_granularity;
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extern unsigned int sysctl_sched_wakeup_granularity;
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extern unsigned int sysctl_sched_child_runs_first;
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enum sched_tunable_scaling {
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SCHED_TUNABLESCALING_NONE,
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@ -37,7 +38,7 @@ enum sched_tunable_scaling {
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SCHED_TUNABLESCALING_LINEAR,
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SCHED_TUNABLESCALING_END,
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};
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extern enum sched_tunable_scaling sysctl_sched_tunable_scaling;
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extern unsigned int sysctl_sched_tunable_scaling;
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extern unsigned int sysctl_numa_balancing_scan_delay;
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extern unsigned int sysctl_numa_balancing_scan_period_min;
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@ -47,9 +48,6 @@ extern unsigned int sysctl_numa_balancing_scan_size;
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#ifdef CONFIG_SCHED_DEBUG
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extern __read_mostly unsigned int sysctl_sched_migration_cost;
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extern __read_mostly unsigned int sysctl_sched_nr_migrate;
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int sched_proc_update_handler(struct ctl_table *table, int write,
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void *buffer, size_t *length, loff_t *ppos);
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#endif
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/*
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@ -5504,9 +5504,11 @@ static const struct file_operations sched_dynamic_fops = {
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.release = single_release,
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};
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extern struct dentry *debugfs_sched;
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static __init int sched_init_debug_dynamic(void)
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{
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debugfs_create_file("sched_preempt", 0644, NULL, NULL, &sched_dynamic_fops);
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debugfs_create_file("sched_preempt", 0644, debugfs_sched, NULL, &sched_dynamic_fops);
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return 0;
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}
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late_initcall(sched_init_debug_dynamic);
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@ -169,15 +169,81 @@ static const struct file_operations sched_feat_fops = {
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.release = single_release,
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};
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#ifdef CONFIG_SMP
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static ssize_t sched_scaling_write(struct file *filp, const char __user *ubuf,
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size_t cnt, loff_t *ppos)
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{
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char buf[16];
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if (cnt > 15)
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cnt = 15;
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if (copy_from_user(&buf, ubuf, cnt))
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return -EFAULT;
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if (kstrtouint(buf, 10, &sysctl_sched_tunable_scaling))
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return -EINVAL;
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if (sched_update_scaling())
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return -EINVAL;
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*ppos += cnt;
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return cnt;
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}
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static int sched_scaling_show(struct seq_file *m, void *v)
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{
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seq_printf(m, "%d\n", sysctl_sched_tunable_scaling);
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return 0;
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}
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static int sched_scaling_open(struct inode *inode, struct file *filp)
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{
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return single_open(filp, sched_scaling_show, NULL);
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}
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static const struct file_operations sched_scaling_fops = {
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.open = sched_scaling_open,
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.write = sched_scaling_write,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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#endif /* SMP */
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__read_mostly bool sched_debug_enabled;
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struct dentry *debugfs_sched;
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static __init int sched_init_debug(void)
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{
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debugfs_create_file("sched_features", 0644, NULL, NULL,
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&sched_feat_fops);
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struct dentry __maybe_unused *numa;
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debugfs_create_bool("sched_debug", 0644, NULL,
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&sched_debug_enabled);
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debugfs_sched = debugfs_create_dir("sched", NULL);
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debugfs_create_file("features", 0644, debugfs_sched, NULL, &sched_feat_fops);
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debugfs_create_bool("debug_enabled", 0644, debugfs_sched, &sched_debug_enabled);
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debugfs_create_u32("latency_ns", 0644, debugfs_sched, &sysctl_sched_latency);
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debugfs_create_u32("min_granularity_ns", 0644, debugfs_sched, &sysctl_sched_min_granularity);
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debugfs_create_u32("wakeup_granularity_ns", 0644, debugfs_sched, &sysctl_sched_wakeup_granularity);
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#ifdef CONFIG_SMP
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debugfs_create_file("tunable_scaling", 0644, debugfs_sched, NULL, &sched_scaling_fops);
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debugfs_create_u32("migration_cost_ns", 0644, debugfs_sched, &sysctl_sched_migration_cost);
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debugfs_create_u32("nr_migrate", 0644, debugfs_sched, &sysctl_sched_nr_migrate);
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#endif
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#ifdef CONFIG_NUMA_BALANCING
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numa = debugfs_create_dir("numa_balancing", debugfs_sched);
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debugfs_create_u32("scan_delay_ms", 0644, numa, &sysctl_numa_balancing_scan_delay);
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debugfs_create_u32("scan_period_min_ms", 0644, numa, &sysctl_numa_balancing_scan_period_min);
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debugfs_create_u32("scan_period_max_ms", 0644, numa, &sysctl_numa_balancing_scan_period_max);
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debugfs_create_u32("scan_size_mb", 0644, numa, &sysctl_numa_balancing_scan_size);
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#endif
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return 0;
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}
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@ -49,7 +49,7 @@ static unsigned int normalized_sysctl_sched_latency = 6000000ULL;
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*
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* (default SCHED_TUNABLESCALING_LOG = *(1+ilog(ncpus))
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*/
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enum sched_tunable_scaling sysctl_sched_tunable_scaling = SCHED_TUNABLESCALING_LOG;
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unsigned int sysctl_sched_tunable_scaling = SCHED_TUNABLESCALING_LOG;
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/*
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* Minimal preemption granularity for CPU-bound tasks:
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@ -634,15 +634,10 @@ struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq)
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* Scheduling class statistics methods:
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*/
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int sched_proc_update_handler(struct ctl_table *table, int write,
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void *buffer, size_t *lenp, loff_t *ppos)
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int sched_update_scaling(void)
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{
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int ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
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unsigned int factor = get_update_sysctl_factor();
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if (ret || !write)
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return ret;
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sched_nr_latency = DIV_ROUND_UP(sysctl_sched_latency,
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sysctl_sched_min_granularity);
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@ -1568,6 +1568,8 @@ static inline void unregister_sched_domain_sysctl(void)
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}
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#endif
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extern int sched_update_scaling(void);
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extern void flush_smp_call_function_from_idle(void);
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#else /* !CONFIG_SMP: */
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@ -184,17 +184,6 @@ static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
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int sysctl_legacy_va_layout;
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#endif
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#ifdef CONFIG_SCHED_DEBUG
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static int min_sched_granularity_ns = 100000; /* 100 usecs */
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static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
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static int min_wakeup_granularity_ns; /* 0 usecs */
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static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
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#ifdef CONFIG_SMP
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static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
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static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
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#endif /* CONFIG_SMP */
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#endif /* CONFIG_SCHED_DEBUG */
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#ifdef CONFIG_COMPACTION
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static int min_extfrag_threshold;
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static int max_extfrag_threshold = 1000;
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@ -1659,91 +1648,6 @@ static struct ctl_table kern_table[] = {
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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#ifdef CONFIG_SCHED_DEBUG
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{
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.procname = "sched_min_granularity_ns",
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.data = &sysctl_sched_min_granularity,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = sched_proc_update_handler,
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.extra1 = &min_sched_granularity_ns,
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.extra2 = &max_sched_granularity_ns,
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},
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{
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.procname = "sched_latency_ns",
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.data = &sysctl_sched_latency,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = sched_proc_update_handler,
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.extra1 = &min_sched_granularity_ns,
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.extra2 = &max_sched_granularity_ns,
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},
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{
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.procname = "sched_wakeup_granularity_ns",
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.data = &sysctl_sched_wakeup_granularity,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = sched_proc_update_handler,
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.extra1 = &min_wakeup_granularity_ns,
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.extra2 = &max_wakeup_granularity_ns,
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},
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#ifdef CONFIG_SMP
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{
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.procname = "sched_tunable_scaling",
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.data = &sysctl_sched_tunable_scaling,
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.maxlen = sizeof(enum sched_tunable_scaling),
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.mode = 0644,
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.proc_handler = sched_proc_update_handler,
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.extra1 = &min_sched_tunable_scaling,
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.extra2 = &max_sched_tunable_scaling,
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},
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{
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.procname = "sched_migration_cost_ns",
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.data = &sysctl_sched_migration_cost,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{
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.procname = "sched_nr_migrate",
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.data = &sysctl_sched_nr_migrate,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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#endif /* CONFIG_SMP */
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#ifdef CONFIG_NUMA_BALANCING
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{
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.procname = "numa_balancing_scan_delay_ms",
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.data = &sysctl_numa_balancing_scan_delay,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{
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.procname = "numa_balancing_scan_period_min_ms",
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.data = &sysctl_numa_balancing_scan_period_min,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{
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.procname = "numa_balancing_scan_period_max_ms",
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.data = &sysctl_numa_balancing_scan_period_max,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{
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.procname = "numa_balancing_scan_size_mb",
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.data = &sysctl_numa_balancing_scan_size,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = SYSCTL_ONE,
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},
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#endif /* CONFIG_NUMA_BALANCING */
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#endif /* CONFIG_SCHED_DEBUG */
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#ifdef CONFIG_SCHEDSTATS
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{
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.procname = "sched_schedstats",
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