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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 10:48:55 +0200 |
| commit | ca8723023f25c9a70d76cbd6101f8fb4ffec2fa0 (patch) | |
| tree | ef753d244a55271279b5b2cf29b28db5b35b454c /arch/s390/include | |
| parent | KVM: s390: Fix memory slot versus run - v3 (diff) | |
| download | linux-ca8723023f25c9a70d76cbd6101f8fb4ffec2fa0.tar.xz linux-ca8723023f25c9a70d76cbd6101f8fb4ffec2fa0.zip | |
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 'arch/s390/include')
| -rw-r--r-- | arch/s390/include/asm/kvm_host.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h index 54ea39f96ecd..a27d0d5a6f86 100644 --- a/arch/s390/include/asm/kvm_host.h +++ b/arch/s390/include/asm/kvm_host.h @@ -13,6 +13,8 @@ #ifndef ASM_KVM_HOST_H #define ASM_KVM_HOST_H +#include <linux/hrtimer.h> +#include <linux/interrupt.h> #include <linux/kvm_host.h> #include <asm/debug.h> #include <asm/cpuid.h> @@ -210,7 +212,8 @@ struct kvm_vcpu_arch { s390_fp_regs guest_fpregs; unsigned int guest_acrs[NUM_ACRS]; struct kvm_s390_local_interrupt local_int; - struct timer_list ckc_timer; + struct hrtimer ckc_timer; + struct tasklet_struct tasklet; union { cpuid_t cpu_id; u64 stidp_data; |