[RFC PATCH 1/3] procfs: add guest steal time in /proc//stat

[Naveen N. Rao]

Introduce a field in /proc/<pid>/stat to expose guest steal time.

Signed-off-by: Naveen N. Rao <naveen.n....@linux.vnet.ibm.com>
---
 fs/proc/array.c       | 6 ++++++
 include/linux/sched.h | 7 +++++++
 kernel/fork.c         | 2 +-
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/fs/proc/array.c b/fs/proc/array.c
index 1295a00..d86f00e 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -363,6 +363,7 @@ static int do_task_stat(struct seq_file *m, struct 
pid_namespace *ns,
        unsigned long rsslim = 0;
        char tcomm[sizeof(task->comm)];
        unsigned long flags;
+       cputime_t gstime;
 
        state = *get_task_state(task);
        vsize = eip = esp = 0;
@@ -382,6 +383,7 @@ static int do_task_stat(struct seq_file *m, struct 
pid_namespace *ns,
        sigemptyset(&sigcatch);
        cutime = cstime = utime = stime = 0;
        cgtime = gtime = 0;
+       gstime = 0;
 
        if (lock_task_sighand(task, &flags)) {
                struct signal_struct *sig = task->signal;
@@ -410,6 +412,7 @@ static int do_task_stat(struct seq_file *m, struct 
pid_namespace *ns,
                                min_flt += t->min_flt;
                                maj_flt += t->maj_flt;
                                gtime += task_gtime(t);
+                               gstime += task_gstime(t);
                        } while_each_thread(task, t);
 
                        min_flt += sig->min_flt;
@@ -432,6 +435,7 @@ static int do_task_stat(struct seq_file *m, struct 
pid_namespace *ns,
                maj_flt = task->maj_flt;
                task_cputime_adjusted(task, &utime, &stime);
                gtime = task_gtime(task);
+               gstime = task_gstime(task);
        }
 
        /* scale priority and nice values from timeslices to -20..20 */
@@ -505,6 +509,8 @@ static int do_task_stat(struct seq_file *m, struct 
pid_namespace *ns,
        else
                seq_put_decimal_ll(m, ' ', 0);
 
+       seq_put_decimal_ull(m, ' ', cputime_to_clock_t(gstime));
+
        seq_putc(m, '\n');
        if (mm)
                mmput(mm);
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 0eabab9..cb57954 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1429,6 +1429,7 @@ struct task_struct {
 
        cputime_t utime, stime, utimescaled, stimescaled;
        cputime_t gtime;
+       cputime_t gstime;
 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
        struct cputime prev_cputime;
 #endif
@@ -1955,6 +1956,12 @@ static inline cputime_t task_gtime(struct task_struct *t)
        return t->gtime;
 }
 #endif
+
+static inline cputime_t task_gstime(struct task_struct *t)
+{
+       return t->gstime;
+}
+
 extern void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, 
cputime_t *st);
 extern void thread_group_cputime_adjusted(struct task_struct *p, cputime_t 
*ut, cputime_t *st);
 
diff --git a/kernel/fork.c b/kernel/fork.c
index cf65139..529ebe5 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1293,7 +1293,7 @@ static struct task_struct *copy_process(unsigned long 
clone_flags,
 
        init_sigpending(&p->pending);
 
-       p->utime = p->stime = p->gtime = 0;
+       p->utime = p->stime = p->gtime = p->gstime = 0;
        p->utimescaled = p->stimescaled = 0;
 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
        p->prev_cputime.utime = p->prev_cputime.stime = 0;
-- 
2.3.5

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