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qemu, lxc: Change host CPU number detection logic.

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The drivers for QEMU and LXC use virNodeGetInfo only to determine
the number of host CPUs. On Linux hosts nodeGetCPUCount has less
overhead.
This commit is contained in:
Viktor Mihajlovski 2012-11-13 13:54:37 +01:00 committed by Eric Blake
parent 689b64d666
commit a2b3d7cff8
3 changed files with 11 additions and 19 deletions
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8
src/lxc/lxc_controller.c
View File

@ -492,17 +492,15 @@ static int virLXCControllerSetupNUMAPolicy(virLXCControllerPtr ctrl)
static int virLXCControllerSetupCpuAffinity(virLXCControllerPtr ctrl)
{
int hostcpus, maxcpu = CPU_SETSIZE;
virNodeInfo nodeinfo;
virBitmapPtr cpumap, cpumapToSet;
VIR_DEBUG("Setting CPU affinity");
if (nodeGetInfo(NULL, &nodeinfo) < 0)
return -1;
/* setaffinity fails if you set bits for CPUs which
* aren't present, so we have to limit ourselves */
hostcpus = VIR_NODEINFO_MAXCPUS(nodeinfo);
if ((hostcpus = nodeGetCPUCount()) < 0)
return -1;
if (maxcpu > hostcpus)
maxcpu = hostcpus;

14
src/qemu/qemu_driver.c
View File

@ -4170,7 +4170,6 @@ qemudDomainGetVcpuPinInfo(virDomainPtr dom,
struct qemud_driver *driver = dom->conn->privateData;
virDomainObjPtr vm = NULL;
virNodeInfo nodeinfo;
virDomainDefPtr targetDef = NULL;
int ret = -1;
int maxcpu, hostcpus, vcpu, pcpu;
@ -4206,9 +4205,9 @@ qemudDomainGetVcpuPinInfo(virDomainPtr dom,
/* Coverity didn't realize that targetDef must be set if we got here. */
sa_assert(targetDef);
if (nodeGetInfo(dom->conn, &nodeinfo) < 0)
if ((hostcpus = nodeGetCPUCount()) < 0)
goto cleanup;
hostcpus = VIR_NODEINFO_MAXCPUS(nodeinfo);
maxcpu = maplen * 8;
if (maxcpu > hostcpus)
maxcpu = hostcpus;
@ -4421,7 +4420,6 @@ qemudDomainGetEmulatorPinInfo(virDomainPtr dom,
{
struct qemud_driver *driver = dom->conn->privateData;
virDomainObjPtr vm = NULL;
virNodeInfo nodeinfo;
virDomainDefPtr targetDef = NULL;
int ret = -1;
int maxcpu, hostcpus, pcpu;
@ -4453,9 +4451,9 @@ qemudDomainGetEmulatorPinInfo(virDomainPtr dom,
/* Coverity didn't realize that targetDef must be set if we got here. */
sa_assert(targetDef);
if (nodeGetInfo(dom->conn, &nodeinfo) < 0)
if ((hostcpus = nodeGetCPUCount()) < 0)
goto cleanup;
hostcpus = VIR_NODEINFO_MAXCPUS(nodeinfo);
maxcpu = maplen * 8;
if (maxcpu > hostcpus)
maxcpu = hostcpus;
@ -4498,7 +4496,6 @@ qemudDomainGetVcpus(virDomainPtr dom,
int maplen) {
struct qemud_driver *driver = dom->conn->privateData;
virDomainObjPtr vm;
virNodeInfo nodeinfo;
int i, v, maxcpu, hostcpus;
int ret = -1;
qemuDomainObjPrivatePtr priv;
@ -4524,10 +4521,9 @@ qemudDomainGetVcpus(virDomainPtr dom,
priv = vm->privateData;
if (nodeGetInfo(dom->conn, &nodeinfo) < 0)
if ((hostcpus = nodeGetCPUCount()) < 0)
goto cleanup;
hostcpus = VIR_NODEINFO_MAXCPUS(nodeinfo);
maxcpu = maplen * 8;
if (maxcpu > hostcpus)
maxcpu = hostcpus;

8
src/qemu/qemu_process.c
View File

@ -1902,15 +1902,13 @@ qemuPrepareCpumap(struct qemud_driver *driver,
virBitmapPtr nodemask)
{
int i, hostcpus, maxcpu = QEMUD_CPUMASK_LEN;
virNodeInfo nodeinfo;
virBitmapPtr cpumap = NULL;
if (nodeGetInfo(NULL, &nodeinfo) < 0)
return NULL;
/* setaffinity fails if you set bits for CPUs which
* aren't present, so we have to limit ourselves */
hostcpus = VIR_NODEINFO_MAXCPUS(nodeinfo);
if ((hostcpus = nodeGetCPUCount()) < 0)
return NULL;
if (maxcpu > hostcpus)
maxcpu = hostcpus;