From 94886b84b1bcdc95f34f70e7fce407efefe472e1 Mon Sep 17 00:00:00 2001 From: Laurent Vivier Date: Mon, 15 Oct 2007 17:00:19 +0200 Subject: sched: guest CPU accounting: maintain stats in account_system_time() modify account_system_time() to add cputime to cpustat->guest if we are running a VCPU. We add this cputime to cpustat->user instead of cpustat->system because this part of KVM code is in fact user code although it is executed in the kernel. We duplicate VCPU time between guest and user to allow an unmodified "top(1)" to display correct value. A modified "top(1)" is able to display good cpu user time and cpu guest time by subtracting cpu guest time from cpu user time. Update "gtime" in task_struct accordingly. Signed-off-by: Laurent Vivier Acked-by: Avi Kivity Signed-off-by: Ingo Molnar --- kernel/sched.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'kernel/sched.c') diff --git a/kernel/sched.c b/kernel/sched.c index 9887ca005c5..5a91fe0b5de 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -3302,6 +3302,25 @@ void account_user_time(struct task_struct *p, cputime_t cputime) cpustat->user = cputime64_add(cpustat->user, tmp); } +/* + * Account guest cpu time to a process. + * @p: the process that the cpu time gets accounted to + * @cputime: the cpu time spent in virtual machine since the last update + */ +void account_guest_time(struct task_struct *p, cputime_t cputime) +{ + cputime64_t tmp; + struct cpu_usage_stat *cpustat = &kstat_this_cpu.cpustat; + + tmp = cputime_to_cputime64(cputime); + + p->utime = cputime_add(p->utime, cputime); + p->gtime = cputime_add(p->gtime, cputime); + + cpustat->user = cputime64_add(cpustat->user, tmp); + cpustat->guest = cputime64_add(cpustat->guest, tmp); +} + /* * Account system cpu time to a process. * @p: the process that the cpu time gets accounted to @@ -3315,6 +3334,12 @@ void account_system_time(struct task_struct *p, int hardirq_offset, struct rq *rq = this_rq(); cputime64_t tmp; + if (p->flags & PF_VCPU) { + account_guest_time(p, cputime); + p->flags &= ~PF_VCPU; + return; + } + p->stime = cputime_add(p->stime, cputime); /* Add system time to cpustat. */ -- cgit v1.2.3-18-g5258