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| author | Keir Fraser <keir.fraser@citrix.com> | 2009-02-13 09:43:06 +0000 |
|---|---|---|
| committer | Keir Fraser <keir.fraser@citrix.com> | 2009-02-13 09:43:06 +0000 |
| commit | 0eecf73be6e7304f382dd16491cd2917f5135bae (patch) | |
| tree | 7dbede426b91e2337b906fda58bebe380279d7a1 /xen/include/xen/timer.h | |
| parent | 737073ac89f753d7601933a29bf71365f733744b (diff) | |
| download | xen-0eecf73be6e7304f382dd16491cd2917f5135bae.tar.gz xen-0eecf73be6e7304f382dd16491cd2917f5135bae.tar.bz2 xen-0eecf73be6e7304f382dd16491cd2917f5135bae.zip | |
hvm: Align periodic vpts.
Aligned periodic vpts can improve the HVM guest power consumption a
lot, especially while the guest using high HZ such as 1000HZ.
Signed-off-by: Wei Gang <gang.wei@intel.com>
Diffstat (limited to 'xen/include/xen/timer.h')
| -rw-r--r-- | xen/include/xen/timer.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/xen/include/xen/timer.h b/xen/include/xen/timer.h index f3d2705d82..0379d950a3 100644 --- a/xen/include/xen/timer.h +++ b/xen/include/xen/timer.h @@ -122,6 +122,9 @@ DECLARE_PER_CPU(s_time_t, timer_deadline); /* Arch-defined function to reprogram timer hardware for new deadline. */ extern int reprogram_timer(s_time_t timeout); +/* calculate the aligned first tick time for a given periodic timer */ +extern s_time_t align_timer(s_time_t firsttick, uint64_t period); + #endif /* _TIMER_H_ */ /* |