forked from luck/tmp_suning_uos_patched
sched: scheduler debugging, core
scheduler debugging core: implement /proc/sched_debug and /proc/<PID>/sched files for scheduler debugging. Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar
parent
77e54a1f88
commit
43ae34cb4c
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@ -929,6 +929,69 @@ static const struct file_operations proc_fault_inject_operations = {
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};
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#endif
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#ifdef CONFIG_SCHED_DEBUG
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/*
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* Print out various scheduling related per-task fields:
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*/
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static int sched_show(struct seq_file *m, void *v)
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{
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struct inode *inode = m->private;
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struct task_struct *p;
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WARN_ON(!inode);
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p = get_proc_task(inode);
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if (!p)
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return -ESRCH;
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proc_sched_show_task(p, m);
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put_task_struct(p);
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return 0;
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}
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static ssize_t
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sched_write(struct file *file, const char __user *buf,
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size_t count, loff_t *offset)
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{
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struct inode *inode = file->f_path.dentry->d_inode;
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struct task_struct *p;
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WARN_ON(!inode);
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p = get_proc_task(inode);
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if (!p)
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return -ESRCH;
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proc_sched_set_task(p);
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put_task_struct(p);
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return count;
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}
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static int sched_open(struct inode *inode, struct file *filp)
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{
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int ret;
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ret = single_open(filp, sched_show, NULL);
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if (!ret) {
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struct seq_file *m = filp->private_data;
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m->private = inode;
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}
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return ret;
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}
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static const struct file_operations proc_pid_sched_operations = {
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.open = sched_open,
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.read = seq_read,
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.write = sched_write,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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#endif
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static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
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{
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struct inode *inode = dentry->d_inode;
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@ -1963,6 +2026,9 @@ static const struct pid_entry tgid_base_stuff[] = {
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INF("environ", S_IRUSR, pid_environ),
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INF("auxv", S_IRUSR, pid_auxv),
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INF("status", S_IRUGO, pid_status),
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#ifdef CONFIG_SCHED_DEBUG
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REG("sched", S_IRUGO|S_IWUSR, pid_sched),
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#endif
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INF("cmdline", S_IRUGO, pid_cmdline),
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INF("stat", S_IRUGO, tgid_stat),
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INF("statm", S_IRUGO, pid_statm),
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@ -2247,6 +2313,9 @@ static const struct pid_entry tid_base_stuff[] = {
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INF("environ", S_IRUSR, pid_environ),
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INF("auxv", S_IRUSR, pid_auxv),
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INF("status", S_IRUGO, pid_status),
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#ifdef CONFIG_SCHED_DEBUG
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REG("sched", S_IRUGO|S_IWUSR, pid_sched),
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#endif
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INF("cmdline", S_IRUGO, pid_cmdline),
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INF("stat", S_IRUGO, tid_stat),
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INF("statm", S_IRUGO, pid_statm),
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@ -132,6 +132,26 @@ extern unsigned long nr_active(void);
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extern unsigned long nr_iowait(void);
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extern unsigned long weighted_cpuload(const int cpu);
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struct seq_file;
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struct cfs_rq;
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#ifdef CONFIG_SCHED_DEBUG
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extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
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extern void proc_sched_set_task(struct task_struct *p);
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extern void
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print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq, u64 now);
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#else
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static inline void
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proc_sched_show_task(struct task_struct *p, struct seq_file *m)
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{
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}
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static inline void proc_sched_set_task(struct task_struct *p)
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{
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}
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static inline void
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print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq, u64 now)
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{
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}
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#endif
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/*
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* Task state bitmask. NOTE! These bits are also
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275
kernel/sched_debug.c
Normal file
275
kernel/sched_debug.c
Normal file
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@ -0,0 +1,275 @@
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/*
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* kernel/time/sched_debug.c
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*
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* Print the CFS rbtree
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*
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* Copyright(C) 2007, Red Hat, Inc., Ingo Molnar
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/proc_fs.h>
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#include <linux/sched.h>
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#include <linux/seq_file.h>
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#include <linux/kallsyms.h>
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#include <linux/utsname.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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printk(x); \
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} while (0)
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static void
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print_task(struct seq_file *m, struct rq *rq, struct task_struct *p, u64 now)
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{
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if (rq->curr == p)
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SEQ_printf(m, "R");
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else
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SEQ_printf(m, " ");
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SEQ_printf(m, "%15s %5d %15Ld %13Ld %13Ld %9Ld %5d "
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"%15Ld %15Ld %15Ld %15Ld %15Ld\n",
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p->comm, p->pid,
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(long long)p->se.fair_key,
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(long long)(p->se.fair_key - rq->cfs.fair_clock),
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(long long)p->se.wait_runtime,
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(long long)(p->nvcsw + p->nivcsw),
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p->prio,
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(long long)p->se.sum_exec_runtime,
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(long long)p->se.sum_wait_runtime,
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(long long)p->se.sum_sleep_runtime,
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(long long)p->se.wait_runtime_overruns,
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(long long)p->se.wait_runtime_underruns);
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}
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static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu, u64 now)
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{
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struct task_struct *g, *p;
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SEQ_printf(m,
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"\nrunnable tasks:\n"
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" task PID tree-key delta waiting"
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" switches prio"
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" sum-exec sum-wait sum-sleep"
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" wait-overrun wait-underrun\n"
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"------------------------------------------------------------------"
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"----------------"
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"------------------------------------------------"
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"--------------------------------\n");
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read_lock_irq(&tasklist_lock);
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do_each_thread(g, p) {
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if (!p->se.on_rq || task_cpu(p) != rq_cpu)
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continue;
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print_task(m, rq, p, now);
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} while_each_thread(g, p);
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read_unlock_irq(&tasklist_lock);
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}
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static void
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print_cfs_rq_runtime_sum(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
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{
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s64 wait_runtime_rq_sum = 0;
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struct task_struct *p;
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struct rb_node *curr;
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unsigned long flags;
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struct rq *rq = &per_cpu(runqueues, cpu);
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spin_lock_irqsave(&rq->lock, flags);
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curr = first_fair(cfs_rq);
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while (curr) {
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p = rb_entry(curr, struct task_struct, se.run_node);
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wait_runtime_rq_sum += p->se.wait_runtime;
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curr = rb_next(curr);
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}
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spin_unlock_irqrestore(&rq->lock, flags);
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SEQ_printf(m, " .%-30s: %Ld\n", "wait_runtime_rq_sum",
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(long long)wait_runtime_rq_sum);
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}
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void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq, u64 now)
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{
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SEQ_printf(m, "\ncfs_rq %p\n", cfs_rq);
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#define P(x) \
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SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(cfs_rq->x))
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P(fair_clock);
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P(exec_clock);
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P(wait_runtime);
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P(wait_runtime_overruns);
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P(wait_runtime_underruns);
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P(sleeper_bonus);
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#undef P
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print_cfs_rq_runtime_sum(m, cpu, cfs_rq);
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}
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static void print_cpu(struct seq_file *m, int cpu, u64 now)
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{
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struct rq *rq = &per_cpu(runqueues, cpu);
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#ifdef CONFIG_X86
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{
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unsigned int freq = cpu_khz ? : 1;
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SEQ_printf(m, "\ncpu#%d, %u.%03u MHz\n",
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cpu, freq / 1000, (freq % 1000));
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}
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#else
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SEQ_printf(m, "\ncpu#%d\n", cpu);
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#endif
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#define P(x) \
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SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(rq->x))
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P(nr_running);
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SEQ_printf(m, " .%-30s: %lu\n", "load",
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rq->ls.load.weight);
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P(ls.delta_fair);
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P(ls.delta_exec);
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P(nr_switches);
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P(nr_load_updates);
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P(nr_uninterruptible);
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SEQ_printf(m, " .%-30s: %lu\n", "jiffies", jiffies);
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P(next_balance);
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P(curr->pid);
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P(clock);
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P(prev_clock_raw);
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P(clock_warps);
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P(clock_overflows);
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P(clock_unstable_events);
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P(clock_max_delta);
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P(cpu_load[0]);
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P(cpu_load[1]);
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P(cpu_load[2]);
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P(cpu_load[3]);
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P(cpu_load[4]);
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#undef P
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print_cfs_stats(m, cpu, now);
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print_rq(m, rq, cpu, now);
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}
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static int sched_debug_show(struct seq_file *m, void *v)
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{
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u64 now = ktime_to_ns(ktime_get());
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int cpu;
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SEQ_printf(m, "Sched Debug Version: v0.04, cfs-v20, %s %.*s\n",
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init_utsname()->release,
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(int)strcspn(init_utsname()->version, " "),
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init_utsname()->version);
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SEQ_printf(m, "now at %Lu nsecs\n", (unsigned long long)now);
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for_each_online_cpu(cpu)
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print_cpu(m, cpu, now);
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SEQ_printf(m, "\n");
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return 0;
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}
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void sysrq_sched_debug_show(void)
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{
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sched_debug_show(NULL, NULL);
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}
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static int sched_debug_open(struct inode *inode, struct file *filp)
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{
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return single_open(filp, sched_debug_show, NULL);
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}
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static 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 int __init init_sched_debug_procfs(void)
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{
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struct proc_dir_entry *pe;
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pe = create_proc_entry("sched_debug", 0644, NULL);
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if (!pe)
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return -ENOMEM;
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pe->proc_fops = &sched_debug_fops;
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return 0;
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}
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__initcall(init_sched_debug_procfs);
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void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
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{
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unsigned long flags;
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int num_threads = 1;
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rcu_read_lock();
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if (lock_task_sighand(p, &flags)) {
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num_threads = atomic_read(&p->signal->count);
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unlock_task_sighand(p, &flags);
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}
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rcu_read_unlock();
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SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid, num_threads);
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SEQ_printf(m, "----------------------------------------------\n");
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#define P(F) \
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SEQ_printf(m, "%-25s:%20Ld\n", #F, (long long)p->F)
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P(se.wait_start);
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P(se.wait_start_fair);
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P(se.exec_start);
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P(se.sleep_start);
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P(se.sleep_start_fair);
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P(se.block_start);
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P(se.sleep_max);
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P(se.block_max);
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P(se.exec_max);
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P(se.wait_max);
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P(se.wait_runtime);
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P(se.wait_runtime_overruns);
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P(se.wait_runtime_underruns);
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P(se.sum_wait_runtime);
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P(se.sum_exec_runtime);
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SEQ_printf(m, "%-25s:%20Ld\n",
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"nr_switches", (long long)(p->nvcsw + p->nivcsw));
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P(se.load.weight);
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P(policy);
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P(prio);
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#undef P
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{
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u64 t0, t1;
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t0 = sched_clock();
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t1 = sched_clock();
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SEQ_printf(m, "%-25s:%20Ld\n",
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"clock-delta", (long long)(t1-t0));
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}
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}
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void proc_sched_set_task(struct task_struct *p)
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{
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p->se.sleep_max = p->se.block_max = p->se.exec_max = p->se.wait_max = 0;
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p->se.wait_runtime_overruns = p->se.wait_runtime_underruns = 0;
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p->se.sum_exec_runtime = 0;
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}
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