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Date: Thu, 17 Sep 2015 11:11:54 +0000
From: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
To: Ingo Molnar <mingo@...hat.com>,
Peter Zijlstra <peterz@...radead.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] cputime: fix invalid gtime
Hi,
have you had to time to see it?
thanks,
Hiroshi
> Subject: [PATCH] cputime: fix invalid gtime
>
> From: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
>
> /proc/stats shows invalid gtime when the thread is running in guest.
> When vtime accounting is not enabled, we cannot get a valid delta.
>
> Just return gtime when vtime accounting is not enabled in task_gtime().
>
> Before
> 10987 (qemu-kvm) S 1 10923 10923 0 -1 138428608 7521 0 90 0 3776 460 0 0 20 0 24 0 11960 8090398720 151288 18446744073709551615
> 1 1 0 0 0 0 2147220671 4096 25155 18446744073709551615 0 0 -1 9 0 0 0 3554 0 0 0 0 0 0 0 0 0
> 10987 (qemu-kvm) S 1 10923 10923 0 -1 138428608 7521 0 90 0 3776 460 0 0 20 0 17 0 11960 8031649792 150268 18446744073709551615
> 1 1 0 0 0 0 2147220671 4096 25155 18446744073709551615 0 0 -1 9 0 0 0 3554 0 0 0 0 0 0 0 0 0
> 10987 (qemu-kvm) R 1 10923 10923 0 -1 138428624 7521 0 90 0 3843 460 0 0 20 0 17 0 11960 8031649792 150268 18446744073709551615
> 1 1 0 0 0 0 2147220671 4096 25155 18446744073709551615 0 0 -1 9 0 0 0 21415 0 0 0 0 0 0 0 0 0
> 10987 (qemu-kvm) R 1 10923 10923 0 -1 138428624 7521 0 90 0 3943 460 0 0 20 0 17 0 11960 8031649792 150268 18446744073709551615
> 1 1 0 0 0 0 2147220671 4096 25155 18446744073709551615 0 0 -1 9 0 0 0 21616 0 0 0 0 0 0 0 0 0
> 10987 (qemu-kvm) R 1 10923 10923 0 -1 138428624 7521 0 90 0 4044 460 0 0 20 0 17 0 11960 8031649792 150268 18446744073709551615
> 1 1 0 0 0 0 2147220671 4096 25155 18446744073709551615 0 0 -1 9 0 0 0 21816 0 0 0 0 0 0 0 0 0
> 10987 (qemu-kvm) R 1 10923 10923 0 -1 138428624 7521 0 90 0 4144 460 0 0 20 0 17 0 11960 8031649792 150268 18446744073709551615
> 1 1 0 0 0 0 2147220671 4096 25155 18446744073709551615 0 0 -1 9 0 0 0 22017 0 0 0 0 0 0 0 0 0
> 10987 (qemu-kvm) R 1 10923 10923 0 -1 138428624 7521 0 90 0 4245 460 0 0 20 0 11 0 11960 7981293568 149758 18446744073709551615
> 1 1 0 0 0 0 2147220671 4096 25155 18446744073709551615 0 0 -1 9 0 0 0 22218 0 0 0 0 0 0 0 0 0
> 10987 (qemu-kvm) S 1 10923 10923 0 -1 138428608 7521 0 90 0 4308 460 0 0 20 0 11 0 11960 7981293568 149758 18446744073709551615
> 1 1 0 0 0 0 2147220671 4096 25155 18446744073709551615 0 0 -1 9 0 0 0 4084 0 0 0 0 0 0 0 0 0
>
> After
> 10845 (qemu-kvm) S 1 10792 10792 0 -1 138428608 202 0 0 0 2858 30 0 0 20 0 29 0 7676 8511279104 148187 18446744073709551615
> 1 1 0 0 0 0 2147220671 4096 25155 18446744073709551615 0 0 -1 3 0 0 0 2874 0 0 0 0 0 0 0 0 0
> 10845 (qemu-kvm) S 1 10792 10792 0 -1 138428608 202 0 0 0 2858 30 0 0 20 0 29 0 7676 8511279104 148187 18446744073709551615
> 1 1 0 0 0 0 2147220671 4096 25155 18446744073709551615 0 0 -1 3 0 0 0 2874 0 0 0 0 0 0 0 0 0
> 10845 (qemu-kvm) R 1 10792 10792 0 -1 138428624 203 0 0 0 2936 30 0 0 20 0 29 0 7676 8511279104 148187 18446744073709551615
> 1 1 0 0 0 0 2147220671 4096 25155 18446744073709551615 0 0 -1 3 0 0 0 2952 0 0 0 0 0 0 0 0 0
> 10845 (qemu-kvm) R 1 10792 10792 0 -1 138428624 203 0 0 0 3037 30 0 0 20 0 29 0 7676 8511279104 152184 18446744073709551615
> 1 1 0 0 0 0 2147220671 4096 25155 18446744073709551615 0 0 -1 3 0 0 0 3052 0 0 0 0 0 0 0 0 0
> 10845 (qemu-kvm) R 1 10792 10792 0 -1 138428624 203 0 0 0 3137 30 0 0 20 0 29 0 7676 8511279104 152184 18446744073709551615
> 1 1 0 0 0 0 2147220671 4096 25155 18446744073709551615 0 0 -1 3 0 0 0 3152 0 0 0 0 0 0 0 0 0
> 10845 (qemu-kvm) R 1 10792 10792 0 -1 138428624 203 0 0 0 3237 30 0 0 20 0 27 0 7676 8511279104 152188 18446744073709551615
> 1 1 0 0 0 0 2147220671 4096 25155 18446744073709551615 0 0 -1 3 0 0 0 3252 0 0 0 0 0 0 0 0 0
> 10845 (qemu-kvm) S 1 10792 10792 0 -1 138428608 203 0 0 0 3262 31 0 0 20 0 11 0 7676 8393781248 151156 18446744073709551615
> 1 1 0 0 0 0 2147220671 4096 25155 18446744073709551615 0 0 -1 3 0 0 0 3277 0 0 0 0 0 0 0 0 0
> 10845 (qemu-kvm) S 1 10792 10792 0 -1 138428608 203 0 0 0 3262 31 0 0 20 0 11 0 7676 8393781248 151156 18446744073709551615
> 1 1 0 0 0 0 2147220671 4096 25155 18446744073709551615 0 0 -1 3 0 0 0 3277 0 0 0 0 0 0 0 0 0
>
> Signed-off-by: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
> ---
> kernel/sched/cputime.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
> index 8cbc3db..f614ee9 100644
> --- a/kernel/sched/cputime.c
> +++ b/kernel/sched/cputime.c
> @@ -786,6 +786,9 @@ cputime_t task_gtime(struct task_struct *t)
> unsigned int seq;
> cputime_t gtime;
>
> + if (!vtime_accounting_enabled())
> + return t->gtime;
> +
> do {
> seq = read_seqbegin(&t->vtime_seqlock);
>
> --
> 1.8.3.1
>
> --
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