From: Christian Borntraeger <borntraeger@de.ibm.com>
Date: Tue, 12 May 2009 15:21:49 +0000 (+0200)
Subject: KVM: s390: use hrtimer for clock wakeup from idle - v2
X-Git-Tag: v2.6.31-rc1~393^2~18
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ca8723023f25c9a70d76cbd6101f8fb4ffec2fa0;p=pandora-kernel.git

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>
---

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