timers: fix itimer/many thread hang

[deliverable/linux.git] / fs / proc / array.c

diff --git a/fs/proc/array.c b/fs/proc/array.c
index 797d775e0354fca502c8ab439c4e986c8e27d237..933953c4e407db8d3c6b1608c263fb222d4dcd6c 100644 (file)
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -80,6 +80,7 @@
 #include <linux/delayacct.h>
 #include <linux/seq_file.h>
 #include <linux/pid_namespace.h>
+#include <linux/tracehook.h>
 
 #include <asm/pgtable.h>
 #include <asm/processor.h>
@@ -168,8 +169,12 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
        rcu_read_lock();
        ppid = pid_alive(p) ?
                task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
-       tpid = pid_alive(p) && p->ptrace ?
-               task_pid_nr_ns(rcu_dereference(p->parent), ns) : 0;
+       tpid = 0;
+       if (pid_alive(p)) {
+               struct task_struct *tracer = tracehook_tracer_task(p);
+               if (tracer)
+                       tpid = task_pid_nr_ns(tracer, ns);
+       }
        seq_printf(m,
                "State:\t%s\n"
                "Tgid:\t%d\n"
@@ -332,65 +337,6 @@ int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
        return 0;
 }
 
-/*
- * Use precise platform statistics if available:
- */
-#ifdef CONFIG_VIRT_CPU_ACCOUNTING
-static cputime_t task_utime(struct task_struct *p)
-{
-       return p->utime;
-}
-
-static cputime_t task_stime(struct task_struct *p)
-{
-       return p->stime;
-}
-#else
-static cputime_t task_utime(struct task_struct *p)
-{
-       clock_t utime = cputime_to_clock_t(p->utime),
-               total = utime + cputime_to_clock_t(p->stime);
-       u64 temp;
-
-       /*
-        * Use CFS's precise accounting:
-        */
-       temp = (u64)nsec_to_clock_t(p->se.sum_exec_runtime);
-
-       if (total) {
-               temp *= utime;
-               do_div(temp, total);
-       }
-       utime = (clock_t)temp;
-
-       p->prev_utime = max(p->prev_utime, clock_t_to_cputime(utime));
-       return p->prev_utime;
-}
-
-static cputime_t task_stime(struct task_struct *p)
-{
-       clock_t stime;
-
-       /*
-        * Use CFS's precise accounting. (we subtract utime from
-        * the total, to make sure the total observed by userspace
-        * grows monotonically - apps rely on that):
-        */
-       stime = nsec_to_clock_t(p->se.sum_exec_runtime) -
-                       cputime_to_clock_t(task_utime(p));
-
-       if (stime >= 0)
-               p->prev_stime = max(p->prev_stime, clock_t_to_cputime(stime));
-
-       return p->prev_stime;
-}
-#endif
-
-static cputime_t task_gtime(struct task_struct *p)
-{
-       return p->gtime;
-}
-
 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
                        struct pid *pid, struct task_struct *task, int whole)
 {
@@ -449,20 +395,20 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
 
                /* add up live thread stats at the group level */
                if (whole) {
+                       struct task_cputime cputime;
                        struct task_struct *t = task;
                        do {
                                min_flt += t->min_flt;
                                maj_flt += t->maj_flt;
-                               utime = cputime_add(utime, task_utime(t));
-                               stime = cputime_add(stime, task_stime(t));
                                gtime = cputime_add(gtime, task_gtime(t));
                                t = next_thread(t);
                        } while (t != task);
 
                        min_flt += sig->min_flt;
                        maj_flt += sig->maj_flt;
-                       utime = cputime_add(utime, sig->utime);
-                       stime = cputime_add(stime, sig->stime);
+                       thread_group_cputime(task, &cputime);
+                       utime = cputime.utime;
+                       stime = cputime.stime;
                        gtime = cputime_add(gtime, sig->gtime);
                }