1087 lines
26 KiB
C
1087 lines
26 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* kernel/sched/debug.c
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*
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* Print the CFS rbtree and other debugging details
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*
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* Copyright(C) 2007, Red Hat, Inc., Ingo Molnar
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*/
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#include "sched.h"
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/*
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* This allows printing both to /proc/sched_debug and
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* to the console
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*/
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#define SEQ_printf(m, x...) \
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do { \
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if (m) \
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seq_printf(m, x); \
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else \
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pr_cont(x); \
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} while (0)
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/*
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* Ease the printing of nsec fields:
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*/
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static long long nsec_high(unsigned long long nsec)
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{
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if ((long long)nsec < 0) {
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nsec = -nsec;
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do_div(nsec, 1000000);
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return -nsec;
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}
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do_div(nsec, 1000000);
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return nsec;
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}
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static unsigned long nsec_low(unsigned long long nsec)
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{
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if ((long long)nsec < 0)
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nsec = -nsec;
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return do_div(nsec, 1000000);
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}
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#define SPLIT_NS(x) nsec_high(x), nsec_low(x)
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#define SCHED_FEAT(name, enabled) \
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#name ,
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static const char * const sched_feat_names[] = {
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#include "features.h"
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};
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#undef SCHED_FEAT
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static int sched_feat_show(struct seq_file *m, void *v)
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{
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int i;
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for (i = 0; i < __SCHED_FEAT_NR; i++) {
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if (!(sysctl_sched_features & (1UL << i)))
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seq_puts(m, "NO_");
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seq_printf(m, "%s ", sched_feat_names[i]);
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}
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seq_puts(m, "\n");
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return 0;
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}
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#ifdef CONFIG_JUMP_LABEL
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#define jump_label_key__true STATIC_KEY_INIT_TRUE
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#define jump_label_key__false STATIC_KEY_INIT_FALSE
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#define SCHED_FEAT(name, enabled) \
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jump_label_key__##enabled ,
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struct static_key sched_feat_keys[__SCHED_FEAT_NR] = {
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#include "features.h"
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};
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#undef SCHED_FEAT
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static void sched_feat_disable(int i)
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{
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static_key_disable_cpuslocked(&sched_feat_keys[i]);
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}
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static void sched_feat_enable(int i)
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{
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static_key_enable_cpuslocked(&sched_feat_keys[i]);
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}
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#else
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static void sched_feat_disable(int i) { };
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static void sched_feat_enable(int i) { };
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#endif /* CONFIG_JUMP_LABEL */
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static int sched_feat_set(char *cmp)
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{
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int i;
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int neg = 0;
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if (strncmp(cmp, "NO_", 3) == 0) {
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neg = 1;
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cmp += 3;
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}
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i = match_string(sched_feat_names, __SCHED_FEAT_NR, cmp);
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if (i < 0)
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return i;
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if (neg) {
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sysctl_sched_features &= ~(1UL << i);
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sched_feat_disable(i);
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} else {
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sysctl_sched_features |= (1UL << i);
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sched_feat_enable(i);
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}
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return 0;
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}
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static ssize_t
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sched_feat_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[64];
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char *cmp;
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int ret;
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struct inode *inode;
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if (cnt > 63)
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cnt = 63;
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if (copy_from_user(&buf, ubuf, cnt))
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return -EFAULT;
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buf[cnt] = 0;
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cmp = strstrip(buf);
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/* Ensure the static_key remains in a consistent state */
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inode = file_inode(filp);
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cpus_read_lock();
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inode_lock(inode);
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ret = sched_feat_set(cmp);
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inode_unlock(inode);
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cpus_read_unlock();
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if (ret < 0)
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return ret;
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*ppos += cnt;
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return cnt;
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}
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static int sched_feat_open(struct inode *inode, struct file *filp)
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{
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return single_open(filp, sched_feat_show, NULL);
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}
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static const struct file_operations sched_feat_fops = {
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.open = sched_feat_open,
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.write = sched_feat_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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#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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unsigned int scaling;
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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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buf[cnt] = '\0';
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if (kstrtouint(buf, 10, &scaling))
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return -EINVAL;
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if (scaling >= SCHED_TUNABLESCALING_END)
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return -EINVAL;
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sysctl_sched_tunable_scaling = scaling;
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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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#ifdef CONFIG_PREEMPT_DYNAMIC
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static ssize_t sched_dynamic_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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int mode;
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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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buf[cnt] = 0;
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mode = sched_dynamic_mode(strstrip(buf));
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if (mode < 0)
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return mode;
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sched_dynamic_update(mode);
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*ppos += cnt;
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return cnt;
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}
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static int sched_dynamic_show(struct seq_file *m, void *v)
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{
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static const char * preempt_modes[] = {
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"none", "voluntary", "full"
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};
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int i;
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for (i = 0; i < ARRAY_SIZE(preempt_modes); i++) {
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if (preempt_dynamic_mode == i)
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seq_puts(m, "(");
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seq_puts(m, preempt_modes[i]);
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if (preempt_dynamic_mode == i)
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seq_puts(m, ")");
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seq_puts(m, " ");
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}
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seq_puts(m, "\n");
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return 0;
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}
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static int sched_dynamic_open(struct inode *inode, struct file *filp)
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{
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return single_open(filp, sched_dynamic_show, NULL);
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}
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static const struct file_operations sched_dynamic_fops = {
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.open = sched_dynamic_open,
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.write = sched_dynamic_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 /* CONFIG_PREEMPT_DYNAMIC */
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__read_mostly bool sched_debug_verbose;
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static const struct seq_operations sched_debug_sops;
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static int sched_debug_open(struct inode *inode, struct file *filp)
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{
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return seq_open(filp, &sched_debug_sops);
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}
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static const struct file_operations sched_debug_fops = {
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.open = sched_debug_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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static struct dentry *debugfs_sched;
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static __init int sched_init_debug(void)
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{
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struct dentry __maybe_unused *numa;
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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("verbose", 0644, debugfs_sched, &sched_debug_verbose);
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#ifdef CONFIG_PREEMPT_DYNAMIC
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debugfs_create_file("preempt", 0644, debugfs_sched, NULL, &sched_dynamic_fops);
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#endif
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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("idle_min_granularity_ns", 0644, debugfs_sched, &sysctl_sched_idle_min_granularity);
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debugfs_create_u32("wakeup_granularity_ns", 0644, debugfs_sched, &sysctl_sched_wakeup_granularity);
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debugfs_create_u32("latency_warn_ms", 0644, debugfs_sched, &sysctl_resched_latency_warn_ms);
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debugfs_create_u32("latency_warn_once", 0644, debugfs_sched, &sysctl_resched_latency_warn_once);
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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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mutex_lock(&sched_domains_mutex);
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update_sched_domain_debugfs();
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mutex_unlock(&sched_domains_mutex);
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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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debugfs_create_file("debug", 0444, debugfs_sched, NULL, &sched_debug_fops);
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return 0;
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}
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late_initcall(sched_init_debug);
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#ifdef CONFIG_SMP
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static cpumask_var_t sd_sysctl_cpus;
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static struct dentry *sd_dentry;
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static int sd_flags_show(struct seq_file *m, void *v)
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{
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unsigned long flags = *(unsigned int *)m->private;
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int idx;
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for_each_set_bit(idx, &flags, __SD_FLAG_CNT) {
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seq_puts(m, sd_flag_debug[idx].name);
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seq_puts(m, " ");
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}
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seq_puts(m, "\n");
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return 0;
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}
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static int sd_flags_open(struct inode *inode, struct file *file)
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{
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return single_open(file, sd_flags_show, inode->i_private);
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}
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static const struct file_operations sd_flags_fops = {
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.open = sd_flags_open,
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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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static void register_sd(struct sched_domain *sd, struct dentry *parent)
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{
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#define SDM(type, mode, member) \
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debugfs_create_##type(#member, mode, parent, &sd->member)
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SDM(ulong, 0644, min_interval);
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SDM(ulong, 0644, max_interval);
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SDM(u64, 0644, max_newidle_lb_cost);
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SDM(u32, 0644, busy_factor);
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SDM(u32, 0644, imbalance_pct);
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SDM(u32, 0644, cache_nice_tries);
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SDM(str, 0444, name);
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#undef SDM
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debugfs_create_file("flags", 0444, parent, &sd->flags, &sd_flags_fops);
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}
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void update_sched_domain_debugfs(void)
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{
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int cpu, i;
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/*
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* This can unfortunately be invoked before sched_debug_init() creates
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* the debug directory. Don't touch sd_sysctl_cpus until then.
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*/
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if (!debugfs_sched)
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return;
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if (!cpumask_available(sd_sysctl_cpus)) {
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if (!alloc_cpumask_var(&sd_sysctl_cpus, GFP_KERNEL))
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return;
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cpumask_copy(sd_sysctl_cpus, cpu_possible_mask);
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}
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if (!sd_dentry)
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sd_dentry = debugfs_create_dir("domains", debugfs_sched);
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for_each_cpu(cpu, sd_sysctl_cpus) {
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struct sched_domain *sd;
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struct dentry *d_cpu;
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char buf[32];
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snprintf(buf, sizeof(buf), "cpu%d", cpu);
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debugfs_remove(debugfs_lookup(buf, sd_dentry));
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d_cpu = debugfs_create_dir(buf, sd_dentry);
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i = 0;
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for_each_domain(cpu, sd) {
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struct dentry *d_sd;
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snprintf(buf, sizeof(buf), "domain%d", i);
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d_sd = debugfs_create_dir(buf, d_cpu);
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register_sd(sd, d_sd);
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i++;
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}
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__cpumask_clear_cpu(cpu, sd_sysctl_cpus);
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}
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}
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void dirty_sched_domain_sysctl(int cpu)
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{
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if (cpumask_available(sd_sysctl_cpus))
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__cpumask_set_cpu(cpu, sd_sysctl_cpus);
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}
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#endif /* CONFIG_SMP */
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#ifdef CONFIG_FAIR_GROUP_SCHED
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static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group *tg)
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{
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struct sched_entity *se = tg->se[cpu];
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#define P(F) SEQ_printf(m, " .%-30s: %lld\n", #F, (long long)F)
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#define P_SCHEDSTAT(F) SEQ_printf(m, " .%-30s: %lld\n", \
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#F, (long long)schedstat_val(stats->F))
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#define PN(F) SEQ_printf(m, " .%-30s: %lld.%06ld\n", #F, SPLIT_NS((long long)F))
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#define PN_SCHEDSTAT(F) SEQ_printf(m, " .%-30s: %lld.%06ld\n", \
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#F, SPLIT_NS((long long)schedstat_val(stats->F)))
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if (!se)
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return;
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PN(se->exec_start);
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PN(se->vruntime);
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PN(se->sum_exec_runtime);
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if (schedstat_enabled()) {
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struct sched_statistics *stats;
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stats = __schedstats_from_se(se);
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PN_SCHEDSTAT(wait_start);
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PN_SCHEDSTAT(sleep_start);
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PN_SCHEDSTAT(block_start);
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PN_SCHEDSTAT(sleep_max);
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PN_SCHEDSTAT(block_max);
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PN_SCHEDSTAT(exec_max);
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PN_SCHEDSTAT(slice_max);
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PN_SCHEDSTAT(wait_max);
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PN_SCHEDSTAT(wait_sum);
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P_SCHEDSTAT(wait_count);
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}
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P(se->load.weight);
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#ifdef CONFIG_SMP
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P(se->avg.load_avg);
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P(se->avg.util_avg);
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P(se->avg.runnable_avg);
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#endif
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#undef PN_SCHEDSTAT
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#undef PN
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#undef P_SCHEDSTAT
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#undef P
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}
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#endif
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#ifdef CONFIG_CGROUP_SCHED
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static DEFINE_SPINLOCK(sched_debug_lock);
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static char group_path[PATH_MAX];
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static void task_group_path(struct task_group *tg, char *path, int plen)
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{
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if (autogroup_path(tg, path, plen))
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return;
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cgroup_path(tg->css.cgroup, path, plen);
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}
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/*
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* Only 1 SEQ_printf_task_group_path() caller can use the full length
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* group_path[] for cgroup path. Other simultaneous callers will have
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* to use a shorter stack buffer. A "..." suffix is appended at the end
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* of the stack buffer so that it will show up in case the output length
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* matches the given buffer size to indicate possible path name truncation.
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*/
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#define SEQ_printf_task_group_path(m, tg, fmt...) \
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{ \
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if (spin_trylock(&sched_debug_lock)) { \
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task_group_path(tg, group_path, sizeof(group_path)); \
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SEQ_printf(m, fmt, group_path); \
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spin_unlock(&sched_debug_lock); \
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} else { \
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char buf[128]; \
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char *bufend = buf + sizeof(buf) - 3; \
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task_group_path(tg, buf, bufend - buf); \
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strcpy(bufend - 1, "..."); \
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SEQ_printf(m, fmt, buf); \
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} \
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}
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#endif
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static void
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|
print_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 %9Ld %5d ",
|
|
p->comm, task_pid_nr(p),
|
|
SPLIT_NS(p->se.vruntime),
|
|
(long long)(p->nvcsw + p->nivcsw),
|
|
p->prio);
|
|
|
|
SEQ_printf(m, "%9lld.%06ld %9lld.%06ld %9lld.%06ld %9lld.%06ld",
|
|
SPLIT_NS(schedstat_val_or_zero(p->stats.wait_sum)),
|
|
SPLIT_NS(p->se.sum_exec_runtime),
|
|
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 tree-key switches prio"
|
|
" wait-time sum-exec sum-sleep\n");
|
|
SEQ_printf(m, "-------------------------------------------------------"
|
|
"------------------------------------------------------\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 MIN_vruntime = -1, min_vruntime, max_vruntime = -1,
|
|
spread, rq0_min_vruntime, spread0;
|
|
struct rq *rq = cpu_rq(cpu);
|
|
struct sched_entity *last;
|
|
unsigned long flags;
|
|
|
|
#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
|
|
SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock",
|
|
SPLIT_NS(cfs_rq->exec_clock));
|
|
|
|
raw_spin_rq_lock_irqsave(rq, flags);
|
|
if (rb_first_cached(&cfs_rq->tasks_timeline))
|
|
MIN_vruntime = (__pick_first_entity(cfs_rq))->vruntime;
|
|
last = __pick_last_entity(cfs_rq);
|
|
if (last)
|
|
max_vruntime = last->vruntime;
|
|
min_vruntime = cfs_rq->min_vruntime;
|
|
rq0_min_vruntime = cpu_rq(0)->cfs.min_vruntime;
|
|
raw_spin_rq_unlock_irqrestore(rq, flags);
|
|
SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "MIN_vruntime",
|
|
SPLIT_NS(MIN_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: %d\n", "h_nr_running", cfs_rq->h_nr_running);
|
|
SEQ_printf(m, " .%-30s: %d\n", "idle_nr_running",
|
|
cfs_rq->idle_nr_running);
|
|
SEQ_printf(m, " .%-30s: %d\n", "idle_h_nr_running",
|
|
cfs_rq->idle_h_nr_running);
|
|
SEQ_printf(m, " .%-30s: %ld\n", "load", cfs_rq->load.weight);
|
|
#ifdef CONFIG_SMP
|
|
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_enqueued",
|
|
cfs_rq->avg.util_est.enqueued);
|
|
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
|
|
#endif
|
|
#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_SMP
|
|
PU(rt_nr_migratory);
|
|
#endif
|
|
P(rt_throttled);
|
|
PN(rt_time);
|
|
PN(rt_runtime);
|
|
|
|
#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);
|
|
#ifdef CONFIG_SMP
|
|
PU(dl_nr_migratory);
|
|
dl_bw = &cpu_rq(cpu)->rd->dl_bw;
|
|
#else
|
|
dl_bw = &dl_rq->dl_bw;
|
|
#endif
|
|
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
|
|
SEQ_printf(m, "cpu#%d\n", cpu);
|
|
#endif
|
|
|
|
#define P(x) \
|
|
do { \
|
|
if (sizeof(rq->x) == 4) \
|
|
SEQ_printf(m, " .%-30s: %ld\n", #x, (long)(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
|
|
|
|
#ifdef CONFIG_SMP
|
|
#define P64(n) SEQ_printf(m, " .%-30s: %Ld\n", #n, rq->n);
|
|
P64(avg_idle);
|
|
P64(max_idle_balance_cost);
|
|
#undef P64
|
|
#endif
|
|
|
|
#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_latency);
|
|
PN(sysctl_sched_min_granularity);
|
|
PN(sysctl_sched_idle_min_granularity);
|
|
PN(sysctl_sched_wakeup_granularity);
|
|
P(sysctl_sched_child_runs_first);
|
|
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_BALANCING
|
|
void 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
|
|
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
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
__P(nr_switches);
|
|
__PS("nr_voluntary_switches", p->nvcsw);
|
|
__PS("nr_involuntary_switches", p->nivcsw);
|
|
|
|
P(se.load.weight);
|
|
#ifdef CONFIG_SMP
|
|
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);
|
|
P(se.avg.util_est.ewma);
|
|
PM(se.avg.util_est.enqueued, ~UTIL_AVG_UNCHANGED);
|
|
#endif
|
|
#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
|
|
P(policy);
|
|
P(prio);
|
|
if (task_has_dl_policy(p)) {
|
|
P(dl.runtime);
|
|
P(dl.deadline);
|
|
}
|
|
#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);
|
|
|
|
WARN(__ratelimit(&latency_check_ratelimit),
|
|
"sched: CPU %d need_resched set for > %llu ns (%d ticks) "
|
|
"without schedule\n",
|
|
cpu, latency, cpu_rq(cpu)->ticks_without_resched);
|
|
}
|