sched: latencytop support
LatencyTOP kernel infrastructure; it measures latencies in the scheduler and tracks it system wide and per process. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Ingo Molnar

parent
326587b840
commit
9745512ce7
@@ -310,6 +310,77 @@ static int proc_pid_schedstat(struct task_struct *task, char *buffer)
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}
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#endif
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#ifdef CONFIG_LATENCYTOP
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static int lstats_show_proc(struct seq_file *m, void *v)
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{
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int i;
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struct task_struct *task = m->private;
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seq_puts(m, "Latency Top version : v0.1\n");
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for (i = 0; i < 32; i++) {
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if (task->latency_record[i].backtrace[0]) {
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int q;
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seq_printf(m, "%i %li %li ",
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task->latency_record[i].count,
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task->latency_record[i].time,
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task->latency_record[i].max);
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for (q = 0; q < LT_BACKTRACEDEPTH; q++) {
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char sym[KSYM_NAME_LEN];
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char *c;
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if (!task->latency_record[i].backtrace[q])
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break;
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if (task->latency_record[i].backtrace[q] == ULONG_MAX)
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break;
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sprint_symbol(sym, task->latency_record[i].backtrace[q]);
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c = strchr(sym, '+');
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if (c)
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*c = 0;
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seq_printf(m, "%s ", sym);
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}
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seq_printf(m, "\n");
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}
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}
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return 0;
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}
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static int lstats_open(struct inode *inode, struct file *file)
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{
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int ret;
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struct seq_file *m;
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struct task_struct *task = get_proc_task(inode);
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ret = single_open(file, lstats_show_proc, NULL);
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if (!ret) {
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m = file->private_data;
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m->private = task;
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}
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return ret;
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}
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static ssize_t lstats_write(struct file *file, const char __user *buf,
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size_t count, loff_t *offs)
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{
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struct seq_file *m;
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struct task_struct *task;
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m = file->private_data;
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task = m->private;
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clear_all_latency_tracing(task);
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return count;
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}
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static const struct file_operations proc_lstats_operations = {
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.open = lstats_open,
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.read = seq_read,
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.write = lstats_write,
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.llseek = seq_lseek,
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.release = single_release,
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};
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#endif
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/* The badness from the OOM killer */
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unsigned long badness(struct task_struct *p, unsigned long uptime);
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static int proc_oom_score(struct task_struct *task, char *buffer)
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@@ -1020,6 +1091,7 @@ 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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@@ -2230,6 +2302,9 @@ static const struct pid_entry tgid_base_stuff[] = {
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#ifdef CONFIG_SCHEDSTATS
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INF("schedstat", S_IRUGO, pid_schedstat),
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#endif
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#ifdef CONFIG_LATENCYTOP
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REG("latency", S_IRUGO, lstats),
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#endif
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#ifdef CONFIG_PROC_PID_CPUSET
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REG("cpuset", S_IRUGO, cpuset),
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#endif
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@@ -2555,6 +2630,9 @@ static const struct pid_entry tid_base_stuff[] = {
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#ifdef CONFIG_SCHEDSTATS
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INF("schedstat", S_IRUGO, pid_schedstat),
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#endif
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#ifdef CONFIG_LATENCYTOP
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REG("latency", S_IRUGO, lstats),
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#endif
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#ifdef CONFIG_PROC_PID_CPUSET
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REG("cpuset", S_IRUGO, cpuset),
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#endif
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