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>
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 0f40e82..46ea5d5 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -929,6 +929,69 @@
};
#endif
+#ifdef CONFIG_SCHED_DEBUG
+/*
+ * Print out various scheduling related per-task fields:
+ */
+static int sched_show(struct seq_file *m, void *v)
+{
+ struct inode *inode = m->private;
+ struct task_struct *p;
+
+ WARN_ON(!inode);
+
+ p = get_proc_task(inode);
+ if (!p)
+ return -ESRCH;
+ proc_sched_show_task(p, m);
+
+ put_task_struct(p);
+
+ return 0;
+}
+
+static ssize_t
+sched_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *offset)
+{
+ struct inode *inode = file->f_path.dentry->d_inode;
+ struct task_struct *p;
+
+ WARN_ON(!inode);
+
+ p = get_proc_task(inode);
+ if (!p)
+ return -ESRCH;
+ proc_sched_set_task(p);
+
+ put_task_struct(p);
+
+ return count;
+}
+
+static int sched_open(struct inode *inode, struct file *filp)
+{
+ int ret;
+
+ ret = single_open(filp, sched_show, NULL);
+ if (!ret) {
+ struct seq_file *m = filp->private_data;
+
+ m->private = inode;
+ }
+ return ret;
+}
+
+static const struct file_operations proc_pid_sched_operations = {
+ .open = sched_open,
+ .read = seq_read,
+ .write = sched_write,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+#endif
+
static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
{
struct inode *inode = dentry->d_inode;
@@ -1963,6 +2026,9 @@
INF("environ", S_IRUSR, pid_environ),
INF("auxv", S_IRUSR, pid_auxv),
INF("status", S_IRUGO, pid_status),
+#ifdef CONFIG_SCHED_DEBUG
+ REG("sched", S_IRUGO|S_IWUSR, pid_sched),
+#endif
INF("cmdline", S_IRUGO, pid_cmdline),
INF("stat", S_IRUGO, tgid_stat),
INF("statm", S_IRUGO, pid_statm),
@@ -2247,6 +2313,9 @@
INF("environ", S_IRUSR, pid_environ),
INF("auxv", S_IRUSR, pid_auxv),
INF("status", S_IRUGO, pid_status),
+#ifdef CONFIG_SCHED_DEBUG
+ REG("sched", S_IRUGO|S_IWUSR, pid_sched),
+#endif
INF("cmdline", S_IRUGO, pid_cmdline),
INF("stat", S_IRUGO, tid_stat),
INF("statm", S_IRUGO, pid_statm),