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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>
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@ -4202,7 +4202,6 @@ void account_steal_time(struct task_struct *p, cputime_t steal)
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if (p == rq->idle) {
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p->stime = cputime_add(p->stime, steal);
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account_group_system_time(p, steal);
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if (atomic_read(&rq->nr_iowait) > 0)
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cpustat->iowait = cputime64_add(cpustat->iowait, tmp);
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else
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