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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] hvm: Align periodic vpts.
# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1234518186 0
# Node ID d9480422034bd2b81702a5d87089da7735bd6453
# Parent 5ae8ed54e2cd6b26e12f14e40c948c024ba6273d
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@xxxxxxxxx>
---
tools/python/xen/xend/XendConfig.py | 3 +++
tools/python/xen/xend/XendConstants.py | 1 +
tools/python/xen/xend/XendDomainInfo.py | 6 ++++++
tools/python/xen/xm/create.py | 7 ++++++-
tools/python/xen/xm/xenapi_create.py | 1 +
xen/arch/x86/hvm/hvm.c | 1 +
xen/arch/x86/hvm/vpt.c | 10 ++++++++--
xen/common/timer.c | 7 +++++++
xen/include/public/hvm/params.h | 5 ++++-
xen/include/xen/timer.h | 3 +++
10 files changed, 40 insertions(+), 4 deletions(-)
diff -r 5ae8ed54e2cd -r d9480422034b tools/python/xen/xend/XendConfig.py
--- a/tools/python/xen/xend/XendConfig.py Fri Feb 13 09:38:16 2009 +0000
+++ b/tools/python/xen/xend/XendConfig.py Fri Feb 13 09:43:06 2009 +0000
@@ -158,6 +158,7 @@ XENAPI_PLATFORM_CFG_TYPES = {
'vncdisplay': int,
'vnclisten': str,
'timer_mode': int,
+ 'vpt_align': int,
'viridian': int,
'vncpasswd': str,
'vncunused': int,
@@ -459,6 +460,8 @@ class XendConfig(dict):
self['platform']['rtc_timeoffset'] = 0
if 'hpet' not in self['platform']:
self['platform']['hpet'] = 0
+ if 'vpt_align' not in self['platform']:
+ self['platform']['vpt_align'] = 1
if 'loader' not in self['platform']:
# Old configs may have hvmloader set as PV_kernel param
if self.has_key('PV_kernel') and self['PV_kernel'] != '':
diff -r 5ae8ed54e2cd -r d9480422034b tools/python/xen/xend/XendConstants.py
--- a/tools/python/xen/xend/XendConstants.py Fri Feb 13 09:38:16 2009 +0000
+++ b/tools/python/xen/xend/XendConstants.py Fri Feb 13 09:43:06 2009 +0000
@@ -50,6 +50,7 @@ HVM_PARAM_TIMER_MODE = 10
HVM_PARAM_TIMER_MODE = 10
HVM_PARAM_HPET_ENABLED = 11
HVM_PARAM_ACPI_S_STATE = 14
+HVM_PARAM_VPT_ALIGN = 16
restart_modes = [
"restart",
diff -r 5ae8ed54e2cd -r d9480422034b tools/python/xen/xend/XendDomainInfo.py
--- a/tools/python/xen/xend/XendDomainInfo.py Fri Feb 13 09:38:16 2009 +0000
+++ b/tools/python/xen/xend/XendDomainInfo.py Fri Feb 13 09:43:06 2009 +0000
@@ -2237,6 +2237,12 @@ class XendDomainInfo:
xc.hvm_set_param(self.domid, HVM_PARAM_HPET_ENABLED,
long(hpet))
+ # Optionally enable periodic vpt aligning
+ vpt_align = self.info["platform"].get("vpt_align")
+ if hvm and vpt_align is not None:
+ xc.hvm_set_param(self.domid, HVM_PARAM_VPT_ALIGN,
+ long(vpt_align))
+
# Set maximum number of vcpus in domain
xc.domain_max_vcpus(self.domid, int(self.info['VCPUs_max']))
diff -r 5ae8ed54e2cd -r d9480422034b tools/python/xen/xm/create.py
--- a/tools/python/xen/xm/create.py Fri Feb 13 09:38:16 2009 +0000
+++ b/tools/python/xen/xm/create.py Fri Feb 13 09:43:06 2009 +0000
@@ -218,6 +218,10 @@ gopts.var('timer_mode', val='TIMER_MODE'
fn=set_int, default=1,
use="""Timer mode (0=delay virtual time when ticks are missed;
1=virtual time is always wallclock time.""")
+
+gopts.var('vpt_align', val='VPT_ALIGN',
+ fn=set_int, default=1,
+ use="Enable aligning all periodic vpt to reduce timer interrupts.")
gopts.var('viridian', val='VIRIDIAN',
fn=set_int, default=0,
@@ -891,7 +895,8 @@ def configure_hvm(config_image, vals):
'sdl', 'display', 'xauthority', 'rtc_timeoffset', 'monitor',
'acpi', 'apic', 'usb', 'usbdevice', 'keymap', 'pci', 'hpet',
'guest_os_type', 'hap', 'opengl', 'cpuid', 'cpuid_check',
- 'viridian', 'xen_extended_power_mgmt', 'pci_msitranslate' ]
+ 'viridian', 'xen_extended_power_mgmt', 'pci_msitranslate',
+ 'vpt_align' ]
for a in args:
if a in vals.__dict__ and vals.__dict__[a] is not None:
diff -r 5ae8ed54e2cd -r d9480422034b tools/python/xen/xm/xenapi_create.py
--- a/tools/python/xen/xm/xenapi_create.py Fri Feb 13 09:38:16 2009 +0000
+++ b/tools/python/xen/xm/xenapi_create.py Fri Feb 13 09:43:06 2009 +0000
@@ -1037,6 +1037,7 @@ class sxp2xml:
'usbdevice',
'hpet',
'timer_mode',
+ 'vpt_align',
'viridian',
'vhpt',
'guest_os_type',
diff -r 5ae8ed54e2cd -r d9480422034b xen/arch/x86/hvm/hvm.c
--- a/xen/arch/x86/hvm/hvm.c Fri Feb 13 09:38:16 2009 +0000
+++ b/xen/arch/x86/hvm/hvm.c Fri Feb 13 09:43:06 2009 +0000
@@ -311,6 +311,7 @@ int hvm_domain_initialise(struct domain
hvm_init_guest_time(d);
d->arch.hvm_domain.params[HVM_PARAM_HPET_ENABLED] = 1;
+ d->arch.hvm_domain.params[HVM_PARAM_VPT_ALIGN] = 1;
hvm_init_cacheattr_region_list(d);
diff -r 5ae8ed54e2cd -r d9480422034b xen/arch/x86/hvm/vpt.c
--- a/xen/arch/x86/hvm/vpt.c Fri Feb 13 09:38:16 2009 +0000
+++ b/xen/arch/x86/hvm/vpt.c Fri Feb 13 09:43:06 2009 +0000
@@ -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;
diff -r 5ae8ed54e2cd -r d9480422034b xen/common/timer.c
--- a/xen/common/timer.c Fri Feb 13 09:38:16 2009 +0000
+++ b/xen/common/timer.c Fri Feb 13 09:43:06 2009 +0000
@@ -473,6 +473,13 @@ void process_pending_timers(void)
timer_softirq_action();
}
+s_time_t align_timer(s_time_t firsttick, uint64_t period)
+{
+ if ( !period )
+ return firsttick;
+
+ return firsttick + (period - 1) - ((firsttick - 1) % period);
+}
static void dump_timerq(unsigned char key)
{
diff -r 5ae8ed54e2cd -r d9480422034b xen/include/public/hvm/params.h
--- a/xen/include/public/hvm/params.h Fri Feb 13 09:38:16 2009 +0000
+++ b/xen/include/public/hvm/params.h Fri Feb 13 09:43:06 2009 +0000
@@ -103,6 +103,9 @@
/* TSS used on Intel when CR0.PE=0. */
#define HVM_PARAM_VM86_TSS 15
-#define HVM_NR_PARAMS 16
+/* Boolean: Enable aligning all periodic vpts to reduce interrupts */
+#define HVM_PARAM_VPT_ALIGN 16
+
+#define HVM_NR_PARAMS 17
#endif /* __XEN_PUBLIC_HVM_PARAMS_H__ */
diff -r 5ae8ed54e2cd -r d9480422034b xen/include/xen/timer.h
--- a/xen/include/xen/timer.h Fri Feb 13 09:38:16 2009 +0000
+++ b/xen/include/xen/timer.h Fri Feb 13 09:43:06 2009 +0000
@@ -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_ */
/*
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