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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/arch/x86/hvm/vpt.c | |
| 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/arch/x86/hvm/vpt.c')
| -rw-r--r-- | xen/arch/x86/hvm/vpt.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/xen/arch/x86/hvm/vpt.c b/xen/arch/x86/hvm/vpt.c index 5dae7cd505..33f2400a0e 100644 --- a/xen/arch/x86/hvm/vpt.c +++ b/xen/arch/x86/hvm/vpt.c @@ -389,8 +389,14 @@ void create_periodic_time( * LAPIC ticks for process accounting can see long sequences of process * ticks incorrectly accounted to interrupt processing. */ - if ( !pt->one_shot && (pt->source == PTSRC_lapic) ) - pt->scheduled += delta >> 1; + if ( !pt->one_shot ) + { + if ( v->domain->arch.hvm_domain.params[HVM_PARAM_VPT_ALIGN] ) + pt->scheduled = align_timer(pt->scheduled, pt->period); + else if ( pt->source == PTSRC_lapic ) + pt->scheduled += delta >> 1; + } + pt->cb = cb; pt->priv = data; |