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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] tools: surface smp guest cpu allocation
The xen-unstable branch has support for smp guests. The current method
for allocating virtual cpus to guests is:
1) export XEN_VCPUS=8 # or some other value
2) restart xend with the above variable set.
3) update guest config file to use maxcpus= kernel parameter to limit
cpus discovered.
The attached patch adds an optional parameter (vcpus) to the
xc_linux_build function replacing the getenv() previously used removing
the requirement of using maxcpus kernel parameter to limit the number of
virtual cpus a guest uses. The value can now be controlled in the
domain configuration files.
The default value of 1 is set in XenDomainInfo.py but is overridden by
parsing the config value.
I tested the above patch on the 2005-01-10 unstable tarball with 2.6.10
kernels (dom0 and dom1) rebuilt with CONFIG_SMP=y.
Ryan Harper
Software Engineer; Linux Technology Center
IBM Corp., Austin, Tx
(512) 838-9253 T/L: 678-9253
ryanh@xxxxxxxxxx
diffstat output:
examples/xmexample1 | 3 +++
examples/xmexample2 | 4 ++++
libxc/xc.h | 3 ++-
libxc/xc_linux_build.c | 19 +++++++++----------
python/xen/lowlevel/xc/xc.c | 11 ++++++-----
python/xen/xend/XendDomainInfo.py | 11 ++++++++++-
python/xen/xm/create.py | 7 +++++++
7 files changed, 41 insertions(+), 17 deletions(-)
Signed-off-by: Ryan Harper <ryanh@xxxxxxxxxx>
---
diff -urN a/tools/examples/xmexample1 b/tools/examples/xmexample1
--- a/tools/examples/xmexample1 2005-01-09 22:39:27.000000000 -0600
+++ b/tools/examples/xmexample1 2005-01-11 16:28:22.000000000 -0600
@@ -25,6 +25,9 @@
# Which CPU to start domain on?
#cpu = -1 # leave to Xen to pick
+# Number of Virtual CPUS to use, default is 1
+#vcpus = 1
+
#----------------------------------------------------------------------------
# Define network interfaces.
diff -urN a/tools/examples/xmexample2 b/tools/examples/xmexample2
--- a/tools/examples/xmexample2 2005-01-09 22:39:33.000000000 -0600
+++ b/tools/examples/xmexample2 2005-01-11 16:29:12.000000000 -0600
@@ -55,6 +55,10 @@
#cpu = -1 # leave to Xen to pick
cpu = vmid # set based on vmid (mod number of CPUs)
+# Number of Virtual CPUS to use, default is 1
+#vcpus = 1
+vcpus = 4 # make your domain a 4-way
+
#----------------------------------------------------------------------------
# Define network interfaces.
diff -urN a/tools/libxc/xc.h b/tools/libxc/xc.h
--- a/tools/libxc/xc.h 2005-01-09 22:39:30.000000000 -0600
+++ b/tools/libxc/xc.h 2005-01-11 15:57:52.000000000 -0600
@@ -97,7 +97,8 @@
const char *ramdisk_name,
const char *cmdline,
unsigned int control_evtchn,
- unsigned long flags);
+ unsigned long flags,
+ unsigned int vcpus);
int
xc_plan9_build (int xc_handle,
diff -urN a/tools/libxc/xc_linux_build.c b/tools/libxc/xc_linux_build.c
--- a/tools/libxc/xc_linux_build.c 2005-01-09 22:39:28.000000000 -0600
+++ b/tools/libxc/xc_linux_build.c 2005-01-11 15:59:36.000000000 -0600
@@ -97,7 +97,8 @@
const char *cmdline,
unsigned long shared_info_frame,
unsigned int control_evtchn,
- unsigned long flags)
+ unsigned long flags,
+ unsigned int vcpus)
{
l1_pgentry_t *vl1tab=NULL, *vl1e=NULL;
l2_pgentry_t *vl2tab=NULL, *vl2e=NULL;
@@ -127,8 +128,6 @@
unsigned long vpt_end;
unsigned long v_end;
- char *n_vcpus;
-
memset(&dsi, 0, sizeof(struct domain_setup_info));
rc = parseelfimage(image, image_size, &dsi);
@@ -337,11 +336,10 @@
/* Mask all upcalls... */
for ( i = 0; i < MAX_VIRT_CPUS; i++ )
shared_info->vcpu_data[i].evtchn_upcall_mask = 1;
- n_vcpus = getenv("XEN_VCPUS");
- if ( n_vcpus )
- shared_info->n_vcpu = atoi(n_vcpus);
- else
- shared_info->n_vcpu = 1;
+
+ shared_info->n_vcpu = vcpus;
+ printf("VCPUS = %d\n",shared_info->n_vcpu);
+
munmap(shared_info, PAGE_SIZE);
/* Send the page update requests down to the hypervisor. */
@@ -433,7 +431,8 @@
const char *ramdisk_name,
const char *cmdline,
unsigned int control_evtchn,
- unsigned long flags)
+ unsigned long flags,
+ unsigned int vcpus)
{
dom0_op_t launch_op, op;
int initrd_fd = -1;
@@ -498,7 +497,7 @@
&vstartinfo_start, &vkern_entry,
ctxt, cmdline,
op.u.getdomaininfo.shared_info_frame,
- control_evtchn, flags) < 0 )
+ control_evtchn, flags, vcpus) < 0 )
{
ERROR("Error constructing guest OS");
goto error_out;
diff -urN a/tools/python/xen/lowlevel/xc/xc.c
b/tools/python/xen/lowlevel/xc/xc.c
--- a/tools/python/xen/lowlevel/xc/xc.c 2005-01-09 22:39:26.000000000 -0600
+++ b/tools/python/xen/lowlevel/xc/xc.c 2005-01-11 16:00:40.000000000 -0600
@@ -348,19 +348,19 @@
u32 dom;
char *image, *ramdisk = NULL, *cmdline = "";
- int control_evtchn, flags = 0;
+ int control_evtchn, flags = 0, vcpus = 1;
static char *kwd_list[] = { "dom", "control_evtchn",
- "image", "ramdisk", "cmdline", "flags",
+ "image", "ramdisk", "cmdline", "flags",
"vcpus",
NULL };
- if ( !PyArg_ParseTupleAndKeywords(args, kwds, "iis|ssi", kwd_list,
+ if ( !PyArg_ParseTupleAndKeywords(args, kwds, "iis|ssii", kwd_list,
&dom, &control_evtchn,
- &image, &ramdisk, &cmdline, &flags) )
+ &image, &ramdisk, &cmdline, &flags,
&vcpus) )
return NULL;
if ( xc_linux_build(xc->xc_handle, dom, image,
- ramdisk, cmdline, control_evtchn, flags) != 0 )
+ ramdisk, cmdline, control_evtchn, flags, vcpus) != 0 )
return PyErr_SetFromErrno(xc_error);
Py_INCREF(zero);
@@ -1023,6 +1023,7 @@
" image [str]: Name of kernel image file. May be gzipped.\n"
" ramdisk [str, n/a]: Name of ramdisk file, if any.\n"
" cmdline [str, n/a]: Kernel parameters, if any.\n\n"
+ " vcpus [int, 1]: Number of Virtual CPUS in domain.\n\n"
"Returns: [int] 0 on success; -1 on error.\n" },
{ "vmx_build",
diff -urN a/tools/python/xen/xend/XendDomainInfo.py
b/tools/python/xen/xend/XendDomainInfo.py
--- a/tools/python/xen/xend/XendDomainInfo.py 2005-01-09 22:39:26.000000000
-0600
+++ b/tools/python/xen/xend/XendDomainInfo.py 2005-01-11 16:12:01.000000000
-0600
@@ -321,6 +321,7 @@
self.console_port = None
self.savedinfo = None
self.is_vmx = 0
+ self.vcpus = 1
def setdom(self, dom):
"""Set the domain id.
@@ -448,6 +449,11 @@
cpu = sxp.child_value(config, 'cpu')
if self.recreate and self.dom and cpu is not None:
xc.domain_pincpu(self.dom, int(cpu))
+ try:
+ image = sxp.child_value(self.config, 'image')
+ self.vcpus = int(sxp.child_value(image, 'vcpus'))
+ except:
+ raise VmError('invalid vcpus value')
self.init_domain()
self.configure_console()
@@ -746,12 +752,14 @@
ramdisk = ramdisk,
flags = flags)
else:
+ log.warning('building dom with %d vcpus', self.vcpus)
err = buildfn(dom = dom,
image = kernel,
control_evtchn = self.console.getRemotePort(),
cmdline = cmdline,
ramdisk = ramdisk,
- flags = flags)
+ flags = flags,
+ vcpus = self.vcpus)
if err != 0:
raise VmError('Building domain failed: type=%s dom=%d err=%d'
% (ostype, dom, err))
@@ -1280,6 +1288,7 @@
add_config_handler('image', vm_field_ignore)
add_config_handler('device', vm_field_ignore)
add_config_handler('backend', vm_field_ignore)
+add_config_handler('vcpus', vm_field_ignore)
# Register other config handlers.
add_config_handler('maxmem', vm_field_maxmem)
diff -urN a/tools/python/xen/xm/create.py b/tools/python/xen/xm/create.py
--- a/tools/python/xen/xm/create.py 2005-01-09 22:39:24.000000000 -0600
+++ b/tools/python/xen/xm/create.py 2005-01-11 16:13:28.000000000 -0600
@@ -109,6 +109,10 @@
fn=set_int, default=None,
use="CPU to run the domain on.")
+gopts.var('vcpus', val='VCPUS',
+ fn=set_int, default=1,
+ use="# of Virtual CPUS in domain.")
+
gopts.var('cpu_weight', val='WEIGHT',
fn=set_float, default=None,
use="""Set the new domain's cpu weight.
@@ -245,7 +249,10 @@
config_image.append(['root', cmdline_root])
if vals.extra:
config_image.append(['args', vals.extra])
+ if vals.vcpus:
+ config_image.append(['vcpus', vals.vcpus])
config.append(['image', config_image ])
+
def configure_disks(config_devs, vals):
"""Create the config for disks (virtual block devices).
-------------------------------------------------------
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