[RFC PATCH 11/11] nohz,kvm,time: teach account_process_tick about guest time

[riel]

From: Rik van Riel <riel@xxxxxxxxxx>

When tick based accounting is run from a remote CPU, it is actually
possible to encounter a task with PF_VCPU set. Make sure to account
those as guest time.

Signed-off-by: Rik van Riel <riel@xxxxxxxxxx>
---
 kernel/sched/cputime.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
index 593f97b0fe3c..6295679fe5f5 100644
--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@@ -488,7 +488,9 @@ void account_process_tick(struct task_struct *p, int user_tick)
 	if (steal_account_process_tick(cpu))
 		return;
 
-	if (user_tick)
+	if (p->flags & PF_VCPU)
+		account_guest_time(p, cputime_one_jiffy, one_jiffy_scaled);
+	else if (user_tick)
 		account_user_time(p, cputime_one_jiffy, one_jiffy_scaled);
 	else if ((p != rq->idle) || (irq_count() != HARDIRQ_OFFSET))
 		account_system_time(p, HARDIRQ_OFFSET, cputime_one_jiffy,
-- 
2.1.0

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