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| author | Christian Borntraeger <borntraeger@de.ibm.com> | 2009-05-12 17:21:49 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2009-06-10 11:48:55 +0300 |
| commit | ca8723023f25c9a70d76cbd6101f8fb4ffec2fa0 (patch) | |
| tree | ef753d244a55271279b5b2cf29b28db5b35b454c /kernel/compat.c | |
| parent | 2668dab794272f0898491acaf1e77e9a005abc0f (diff) | |
KVM: s390: use hrtimer for clock wakeup from idle - v2
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>
Diffstat (limited to 'kernel/compat.c')
0 files changed, 0 insertions, 0 deletions