account_steal_time: kill the unneeded account_group_system_time()

Impact: remove unnecessary accounting call

I don't actually understand account_steal_time() and I failed to find the
commit which added account_group_system_time(), but this looks bogus.
In any case rq->idle must be single-threaded, so it can't have ->totals.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/sched.c b/kernel/sched.c
index c94baf2..b388c9b 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4202,7 +4202,6 @@ void account_steal_time(struct task_struct *p, cputime_t steal)
 
        if (p == rq->idle) {
                p->stime = cputime_add(p->stime, steal);
-               account_group_system_time(p, steal);
                if (atomic_read(&rq->nr_iowait) > 0)
                        cpustat->iowait = cputime64_add(cpustat->iowait, tmp);
                else