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Introduce the function virCgroupForVcpu

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Introduce the function virCgroupForVcpu() to create sub directory for each vcpu.
This commit is contained in:
Wen Congyang 2011-07-21 15:12:55 +08:00
parent e40725779c
commit 8e64f87306
3 changed files with 74 additions and 6 deletions
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1
src/libvirt_private.syms
View File

@ -67,6 +67,7 @@ virCgroupDenyAllDevices;
virCgroupDenyDevicePath;
virCgroupForDomain;
virCgroupForDriver;
virCgroupForVcpu;
virCgroupFree;
virCgroupGetBlkioWeight;
virCgroupGetCpuShares;

74
src/util/cgroup.c
View File

@ -52,6 +52,16 @@ struct virCgroup {
struct virCgroupController controllers[VIR_CGROUP_CONTROLLER_LAST];
};
typedef enum {
VIR_CGROUP_NONE = 0, /* create subdir under each cgroup if possible. */
VIR_CGROUP_MEM_HIERACHY = 1 << 0, /* call virCgroupSetMemoryUseHierarchy
* before creating subcgroups and
* attaching tasks
*/
VIR_CGROUP_VCPU = 1 << 1, /* create subdir only under the cgroup cpu,
* cpuacct and cpuset if possible. */
} virCgroupFlags;
/**
* virCgroupFree:
*
@ -503,7 +513,7 @@ static int virCgroupSetMemoryUseHierarchy(virCgroupPtr group)
}
static int virCgroupMakeGroup(virCgroupPtr parent, virCgroupPtr group,
int create, bool memory_hierarchy)
int create, unsigned int flags)
{
int i;
int rc = 0;
@ -516,6 +526,13 @@ static int virCgroupMakeGroup(virCgroupPtr parent, virCgroupPtr group,
if (!group->controllers[i].mountPoint)
continue;
/* We need to control cpu bandwidth for each vcpu now */
if ((flags & VIR_CGROUP_VCPU) && (i != VIR_CGROUP_CONTROLLER_CPU)) {
/* treat it as unmounted and we can use virCgroupAddTask */
VIR_FREE(group->controllers[i].mountPoint);
continue;
}
rc = virCgroupPathOfController(group, i, "", &path);
if (rc < 0)
return rc;
@ -555,8 +572,8 @@ static int virCgroupMakeGroup(virCgroupPtr parent, virCgroupPtr group,
* Note that virCgroupSetMemoryUseHierarchy should always be
* called prior to creating subcgroups and attaching tasks.
*/
if (memory_hierarchy &&
group->controllers[VIR_CGROUP_CONTROLLER_MEMORY].mountPoint != NULL &&
if ((flags & VIR_CGROUP_MEM_HIERACHY) &&
(group->controllers[VIR_CGROUP_CONTROLLER_MEMORY].mountPoint != NULL) &&
(i == VIR_CGROUP_CONTROLLER_MEMORY ||
STREQ(group->controllers[i].mountPoint, group->controllers[VIR_CGROUP_CONTROLLER_MEMORY].mountPoint))) {
rc = virCgroupSetMemoryUseHierarchy(group);
@ -641,7 +658,7 @@ static int virCgroupAppRoot(int privileged,
if (rc != 0)
goto cleanup;
rc = virCgroupMakeGroup(rootgrp, *group, create, false);
rc = virCgroupMakeGroup(rootgrp, *group, create, VIR_CGROUP_NONE);
cleanup:
virCgroupFree(&rootgrp);
@ -801,7 +818,7 @@ int virCgroupForDriver(const char *name,
VIR_FREE(path);
if (rc == 0) {
rc = virCgroupMakeGroup(rootgrp, *group, create, false);
rc = virCgroupMakeGroup(rootgrp, *group, create, VIR_CGROUP_NONE);
if (rc != 0)
virCgroupFree(group);
}
@ -861,7 +878,7 @@ int virCgroupForDomain(virCgroupPtr driver,
* a group for driver, is to avoid overhead to track
* cumulative usage that we don't need.
*/
rc = virCgroupMakeGroup(driver, *group, create, true);
rc = virCgroupMakeGroup(driver, *group, create, VIR_CGROUP_MEM_HIERACHY);
if (rc != 0)
virCgroupFree(group);
}
@ -878,6 +895,51 @@ int virCgroupForDomain(virCgroupPtr driver ATTRIBUTE_UNUSED,
}
#endif
/**
* virCgroupForVcpu:
*
* @driver: group for the domain
* @vcpuid: id of the vcpu
* @group: Pointer to returned virCgroupPtr
*
* Returns 0 on success
*/
#if defined HAVE_MNTENT_H && defined HAVE_GETMNTENT_R
int virCgroupForVcpu(virCgroupPtr driver,
int vcpuid,
virCgroupPtr *group,
int create)
{
int rc;
char *path;
if (driver == NULL)
return -EINVAL;
if (virAsprintf(&path, "%s/vcpu%d", driver->path, vcpuid) < 0)
return -ENOMEM;
rc = virCgroupNew(path, group);
VIR_FREE(path);
if (rc == 0) {
rc = virCgroupMakeGroup(driver, *group, create, VIR_CGROUP_VCPU);
if (rc != 0)
virCgroupFree(group);
}
return rc;
}
#else
int virCgroupForVcpu(virCgroupPtr driver ATTRIBUTE_UNUSED,
int vcpuid ATTRIBUTE_UNUSED,
virCgroupPtr *group ATTRIBUTE_UNUSED,
int create ATTRIBUTE_UNUSED)
{
return -ENXIO;
}
#endif
/**
* virCgroupSetBlkioWeight:
*

5
src/util/cgroup.h
View File

@ -40,6 +40,11 @@ int virCgroupForDomain(virCgroupPtr driver,
virCgroupPtr *group,
int create);
int virCgroupForVcpu(virCgroupPtr driver,
int vcpuid,
virCgroupPtr *group,
int create);
int virCgroupPathOfController(virCgroupPtr group,
int controller,
const char *key,