Messages in this thread | | | From | Hiroshi Shimamoto <> | Subject | RE: [PATCH] cputime: fix invalid gtime | Date | Thu, 17 Sep 2015 11:11:54 +0000 |
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Hi,
have you had to time to see it?
thanks, Hiroshi
> Subject: [PATCH] cputime: fix invalid gtime > > From: Hiroshi Shimamoto <h-shimamoto@ct.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@ct.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 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/
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