sched: guest CPU accounting: add guest-CPU /proc/<pid>/stat fields

like for cpustat, introduce the "gtime" (guest time of the task) and
"cgtime" (guest time of the task children) fields for the
tasks. Modify signal_struct and task_struct.

Modify /proc/<pid>/stat to display these new fields.

Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net>
Acked-by: Avi Kivity <avi@qumranet.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

4 files changed, 27 insertions, 2 deletions

diff --git a/fs/proc/array.c b/fs/proc/array.c
index ee4814dd98f9..27b59f5f3bd1 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -370,6 +370,11 @@ static cputime_t task_stime(struct task_struct *p)
 }
 #endif
 
+static cputime_t task_gtime(struct task_struct *p)
+{
+        return p->gtime;
+}
+
 static int do_task_stat(struct task_struct *task, char *buffer, int whole)
 {
         unsigned long vsize, eip, esp, wchan = ~0UL;
@@ -385,6 +390,7 @@ static int do_task_stat(struct task_struct *task, char *buffer, int whole)
         unsigned long cmin_flt = 0, cmaj_flt = 0;
         unsigned long  min_flt = 0,  maj_flt = 0;
         cputime_t cutime, cstime, utime, stime;
+        cputime_t cgtime, gtime;
         unsigned long rsslim = 0;
         char tcomm[sizeof(task->comm)];
         unsigned long flags;
@@ -403,6 +409,7 @@ static int do_task_stat(struct task_struct *task, char *buffer, int whole)
         sigemptyset(&sigign);
         sigemptyset(&sigcatch);
         cutime = cstime = utime = stime = cputime_zero;
+        cgtime = gtime = cputime_zero;
 
         rcu_read_lock();
         if (lock_task_sighand(task, &flags)) {
@@ -420,6 +427,7 @@ static int do_task_stat(struct task_struct *task, char *buffer, int whole)
                 cmaj_flt = sig->cmaj_flt;
                 cutime = sig->cutime;
                 cstime = sig->cstime;
+                cgtime = sig->cgtime;
                 rsslim = sig->rlim[RLIMIT_RSS].rlim_cur;
 
                 /* add up live thread stats at the group level */
@@ -430,6 +438,7 @@ static int do_task_stat(struct task_struct *task, char *buffer, int whole)
                                 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);
 
@@ -437,6 +446,7 @@ static int do_task_stat(struct task_struct *task, char *buffer, int whole)
                         maj_flt += sig->maj_flt;
                         utime = cputime_add(utime, sig->utime);
                         stime = cputime_add(stime, sig->stime);
+                        gtime += cputime_add(gtime, sig->gtime);
                 }
 
                 sid = signal_session(sig);
@@ -454,6 +464,7 @@ static int do_task_stat(struct task_struct *task, char *buffer, int whole)
                 maj_flt = task->maj_flt;
                 utime = task_utime(task);
                 stime = task_stime(task);
+                gtime = task_gtime(task);
         }
 
         /* scale priority and nice values from timeslices to -20..20 */
@@ -471,7 +482,7 @@ static int do_task_stat(struct task_struct *task, char *buffer, int whole)
 
         res = sprintf(buffer, "%d (%s) %c %d %d %d %d %d %u %lu \
 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
-%lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu\n",
+%lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld\n",
                 task->pid,
                 tcomm,
                 state,
@@ -516,7 +527,9 @@ static int do_task_stat(struct task_struct *task, char *buffer, int whole)
                 task_cpu(task),
                 task->rt_priority,
                 task->policy,
-                (unsigned long long)delayacct_blkio_ticks(task));
+                (unsigned long long)delayacct_blkio_ticks(task),
+                cputime_to_clock_t(gtime),
+                cputime_to_clock_t(cgtime));
         if (mm)
                 mmput(mm);
         return res;
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 3a6e05e77715..fefce22e4c16 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -517,6 +517,8 @@ struct signal_struct {
          * in __exit_signal, except for the group leader.
          */
         cputime_t utime, stime, cutime, cstime;
+        cputime_t gtime;
+        cputime_t cgtime;
         unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
         unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
         unsigned long inblock, oublock, cinblock, coublock;
@@ -1048,6 +1050,7 @@ struct task_struct {
 
         unsigned int rt_priority;
         cputime_t utime, stime;
+        cputime_t gtime;
         unsigned long nvcsw, nivcsw; /* context switch counts */
         struct timespec start_time;             /* monotonic time */
         struct timespec real_start_time;        /* boot based time */
diff --git a/kernel/exit.c b/kernel/exit.c
index 993369ee94d1..7f7959de4a87 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -111,6 +111,7 @@ static void __exit_signal(struct task_struct *tsk)
                  */
                 sig->utime = cputime_add(sig->utime, tsk->utime);
                 sig->stime = cputime_add(sig->stime, tsk->stime);
+                sig->gtime = cputime_add(sig->gtime, tsk->gtime);
                 sig->min_flt += tsk->min_flt;
                 sig->maj_flt += tsk->maj_flt;
                 sig->nvcsw += tsk->nvcsw;
@@ -1242,6 +1243,11 @@ static int wait_task_zombie(struct task_struct *p, int noreap,
                         cputime_add(p->stime,
                         cputime_add(sig->stime,
                                     sig->cstime)));
+                psig->cgtime =
+                        cputime_add(psig->cgtime,
+                        cputime_add(p->gtime,
+                        cputime_add(sig->gtime,
+                                    sig->cgtime)));
                 psig->cmin_flt +=
                         p->min_flt + sig->min_flt + sig->cmin_flt;
                 psig->cmaj_flt +=
diff --git a/kernel/fork.c b/kernel/fork.c
index 5e67f90a1694..3fc3c1383912 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -877,6 +877,8 @@ static inline int copy_signal(unsigned long clone_flags, struct task_struct * ts
         sig->tty_old_pgrp = NULL;
 
         sig->utime = sig->stime = sig->cutime = sig->cstime = cputime_zero;
+        sig->gtime = cputime_zero;
+        sig->cgtime = cputime_zero;
         sig->nvcsw = sig->nivcsw = sig->cnvcsw = sig->cnivcsw = 0;
         sig->min_flt = sig->maj_flt = sig->cmin_flt = sig->cmaj_flt = 0;
         sig->inblock = sig->oublock = sig->cinblock = sig->coublock = 0;
@@ -1045,6 +1047,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 
         p->utime = cputime_zero;
         p->stime = cputime_zero;
+        p->gtime = cputime_zero;
 
 #ifdef CONFIG_TASK_XACCT
         p->rchar = 0;           /* I/O counter: bytes read */