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authorChristian Borntraeger <borntraeger@de.ibm.com>2007-11-15 20:57:39 +0100
committerIngo Molnar <mingo@elte.hu>2007-11-15 20:57:39 +0100
commit9778385db35a799d410039be123044a0d3e917a2 (patch)
tree20564e6fabb5bdd86a13fc56ae0a6c880a9ccf6e
parent99fee6d7e5748d96884667a4628118f7fc130ea0 (diff)
downloadlinux-stericsson-9778385db35a799d410039be123044a0d3e917a2.tar.gz
sched: fix accounting of interrupts during guest execution on s390
Currently the scheduler checks for PF_VCPU to decide if this timeslice has to be accounted as guest time. On s390 host interrupts are not disabled during guest execution. This causes theses interrupts to be accounted as guest time if CONFIG_VIRT_CPU_ACCOUNTING is set. Solution is to check if an interrupt triggered account_system_time. As the tick is timer interrupt based, we have to subtract hardirq_offset. I tested the patch on s390 with CONFIG_VIRT_CPU_ACCOUNTING and on x86_64. Seems to work. CC: Avi Kivity <avi@qumranet.com> CC: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--kernel/sched.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 4fb3532dd7e8..908335e1781a 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3390,10 +3390,8 @@ 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);
- return;
- }
+ if ((p->flags & PF_VCPU) && (irq_count() - hardirq_offset == 0))
+ return account_guest_time(p, cputime);
p->stime = cputime_add(p->stime, cputime);