KVM: s390: use hrtimer for clock wakeup from idle - v2

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This patch reworks the s390 clock comparator wakeup to hrtimer. The clock
comparator is a per-cpu value that is compared against the TOD clock. If
ckc <= TOD an external interrupt 1004 is triggered. Since the clock comparator
and the TOD clock have a much higher resolution than jiffies we should use
hrtimers to trigger the wakeup. This speeds up guest nanosleep for small
values.

Since hrtimers callbacks run in hard-irq context, I added a tasklet to do
the actual work with enabled interrupts.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Christian Ehrhardt <ehrhardt@de.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

...

This commit is contained in:

Christian Borntraeger 2009-05-12 17:21:49 +02:00 • committed by Avi Kivity

parent 2668dab794

commit ca8723023f

4 changed files with 35 additions and 14 deletions

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5

arch/s390/include/asm/kvm_host.h

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33

arch/s390/kvm/interrupt.c

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7

arch/s390/kvm/kvm-s390.c

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4

arch/s390/kvm/kvm-s390.h

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