[libvirt] [PATCH 15/47] vircgroup: extract virCgroupV1MakeGroup
Pavel Hrdina
phrdina at redhat.com
Tue Sep 18 15:45:36 UTC 2018
Signed-off-by: Pavel Hrdina <phrdina at redhat.com>
---
src/util/vircgroup.c | 141 ++----------------------------------
src/util/vircgroupbackend.h | 15 ++++
src/util/vircgrouppriv.h | 20 +++++
src/util/vircgroupv1.c | 132 +++++++++++++++++++++++++++++++++
4 files changed, 174 insertions(+), 134 deletions(-)
diff --git a/src/util/vircgroup.c b/src/util/vircgroup.c
index 55122a5ab9..8083e4596d 100644
--- a/src/util/vircgroup.c
+++ b/src/util/vircgroup.c
@@ -80,14 +80,6 @@ VIR_ENUM_IMPL(virCgroupController, VIR_CGROUP_CONTROLLER_LAST,
"freezer", "blkio", "net_cls", "perf_event",
"name=systemd");
-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
- */
-} virCgroupFlags;
-
/**
* virCgroupGetDevicePermsString:
@@ -448,7 +440,7 @@ virCgroupGetBlockDevString(const char *path)
}
-static int
+int
virCgroupSetValueStr(virCgroupPtr group,
int controller,
const char *key,
@@ -478,7 +470,7 @@ virCgroupSetValueStr(virCgroupPtr group,
}
-static int
+int
virCgroupGetValueStr(virCgroupPtr group,
int controller,
const char *key,
@@ -539,7 +531,7 @@ virCgroupGetValueForBlkDev(virCgroupPtr group,
}
-static int
+int
virCgroupSetValueU64(virCgroupPtr group,
int controller,
const char *key,
@@ -591,7 +583,7 @@ virCgroupGetValueI64(virCgroupPtr group,
}
-static int
+int
virCgroupGetValueU64(virCgroupPtr group,
int controller,
const char *key,
@@ -613,137 +605,18 @@ virCgroupGetValueU64(virCgroupPtr group,
}
-static int
-virCgroupCpuSetInherit(virCgroupPtr parent, virCgroupPtr group)
-{
- size_t i;
- const char *inherit_values[] = {
- "cpuset.cpus",
- "cpuset.mems",
- "cpuset.memory_migrate",
- };
-
- VIR_DEBUG("Setting up inheritance %s -> %s", parent->path, group->path);
- for (i = 0; i < ARRAY_CARDINALITY(inherit_values); i++) {
- VIR_AUTOFREE(char *) value = NULL;
-
- if (virCgroupGetValueStr(parent,
- VIR_CGROUP_CONTROLLER_CPUSET,
- inherit_values[i],
- &value) < 0)
- return -1;
-
- VIR_DEBUG("Inherit %s = %s", inherit_values[i], value);
-
- if (virCgroupSetValueStr(group,
- VIR_CGROUP_CONTROLLER_CPUSET,
- inherit_values[i],
- value) < 0)
- return -1;
- }
-
- return 0;
-}
-
-
-static int
-virCgroupSetMemoryUseHierarchy(virCgroupPtr group)
-{
- unsigned long long value;
- const char *filename = "memory.use_hierarchy";
-
- if (virCgroupGetValueU64(group,
- VIR_CGROUP_CONTROLLER_MEMORY,
- filename, &value) < 0)
- return -1;
-
- /* Setting twice causes error, so if already enabled, skip setting */
- if (value == 1)
- return 0;
-
- VIR_DEBUG("Setting up %s/%s", group->path, filename);
- if (virCgroupSetValueU64(group,
- VIR_CGROUP_CONTROLLER_MEMORY,
- filename, 1) < 0)
- return -1;
-
- return 0;
-}
-
-
static int
virCgroupMakeGroup(virCgroupPtr parent,
virCgroupPtr group,
bool create,
unsigned int flags)
{
- size_t i;
-
- VIR_DEBUG("Make group %s", group->path);
- for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
- VIR_AUTOFREE(char *) path = NULL;
-
- /* We must never mkdir() in systemd's hierarchy */
- if (i == VIR_CGROUP_CONTROLLER_SYSTEMD) {
- VIR_DEBUG("Not creating systemd controller group");
- continue;
- }
-
- /* Skip over controllers that aren't mounted */
- if (!group->controllers[i].mountPoint) {
- VIR_DEBUG("Skipping unmounted controller %s",
- virCgroupControllerTypeToString(i));
- continue;
- }
-
- if (virCgroupPathOfController(group, i, "", &path) < 0)
- goto error;
-
- VIR_DEBUG("Make controller %s", path);
- if (!virFileExists(path)) {
- if (!create ||
- mkdir(path, 0755) < 0) {
- if (errno == EEXIST)
- continue;
- /* With a kernel that doesn't support multi-level directory
- * for blkio controller, libvirt will fail and disable all
- * other controllers even though they are available. So
- * treat blkio as unmounted if mkdir fails. */
- if (i == VIR_CGROUP_CONTROLLER_BLKIO) {
- VIR_DEBUG("Ignoring mkdir failure with blkio controller. Kernel probably too old");
- VIR_FREE(group->controllers[i].mountPoint);
- continue;
- } else {
- virReportSystemError(errno,
- _("Failed to create controller %s for group"),
- virCgroupControllerTypeToString(i));
- goto error;
- }
- }
- if (i == VIR_CGROUP_CONTROLLER_CPUSET &&
- group->controllers[i].mountPoint != NULL &&
- virCgroupCpuSetInherit(parent, group) < 0) {
- goto error;
- }
- /*
- * Note that virCgroupSetMemoryUseHierarchy should always be
- * called prior to creating subcgroups and attaching tasks.
- */
- if ((flags & VIR_CGROUP_MEM_HIERACHY) &&
- i == VIR_CGROUP_CONTROLLER_MEMORY &&
- group->controllers[i].mountPoint != NULL &&
- virCgroupSetMemoryUseHierarchy(group) < 0) {
- goto error;
- }
- }
+ if (group->backend->makeGroup(parent, group, create, flags) < 0) {
+ virCgroupRemove(group);
+ return -1;
}
- VIR_DEBUG("Done making controllers for group");
return 0;
-
- error:
- virCgroupRemove(group);
- return -1;
}
diff --git a/src/util/vircgroupbackend.h b/src/util/vircgroupbackend.h
index cf000529c4..214c9f0726 100644
--- a/src/util/vircgroupbackend.h
+++ b/src/util/vircgroupbackend.h
@@ -27,6 +27,14 @@
# define CGROUP_MAX_VAL 512
+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
+ */
+} virCgroupBackendFlags;
+
typedef enum {
VIR_CGROUP_BACKEND_TYPE_V1 = 0,
VIR_CGROUP_BACKEND_TYPE_LAST,
@@ -86,6 +94,12 @@ typedef int
const char *key,
char **path);
+typedef int
+(*virCgroupMakeGroupCB)(virCgroupPtr parent,
+ virCgroupPtr group,
+ bool create,
+ unsigned int flags);
+
struct _virCgroupBackend {
virCgroupBackendType type;
@@ -102,6 +116,7 @@ struct _virCgroupBackend {
virCgroupHasControllerCB hasController;
virCgroupGetAnyControllerCB getAnyController;
virCgroupPathOfControllerCB pathOfController;
+ virCgroupMakeGroupCB makeGroup;
};
typedef struct _virCgroupBackend virCgroupBackend;
typedef virCgroupBackend *virCgroupBackendPtr;
diff --git a/src/util/vircgrouppriv.h b/src/util/vircgrouppriv.h
index e7f4a1f0fc..2e731458d5 100644
--- a/src/util/vircgrouppriv.h
+++ b/src/util/vircgrouppriv.h
@@ -53,6 +53,26 @@ struct _virCgroup {
virCgroupController controllers[VIR_CGROUP_CONTROLLER_LAST];
};
+int virCgroupSetValueStr(virCgroupPtr group,
+ int controller,
+ const char *key,
+ const char *value);
+
+int virCgroupGetValueStr(virCgroupPtr group,
+ int controller,
+ const char *key,
+ char **value);
+
+int virCgroupSetValueU64(virCgroupPtr group,
+ int controller,
+ const char *key,
+ unsigned long long int value);
+
+int virCgroupGetValueU64(virCgroupPtr group,
+ int controller,
+ const char *key,
+ unsigned long long int *value);
+
int virCgroupPartitionEscape(char **path);
int virCgroupNewPartition(const char *path,
diff --git a/src/util/vircgroupv1.c b/src/util/vircgroupv1.c
index 7d92150dc3..cf484216cc 100644
--- a/src/util/vircgroupv1.c
+++ b/src/util/vircgroupv1.c
@@ -536,6 +536,137 @@ virCgroupV1PathOfController(virCgroupPtr group,
}
+static int
+virCgroupV1CpuSetInherit(virCgroupPtr parent,
+ virCgroupPtr group)
+{
+ size_t i;
+ const char *inherit_values[] = {
+ "cpuset.cpus",
+ "cpuset.mems",
+ "cpuset.memory_migrate",
+ };
+
+ VIR_DEBUG("Setting up inheritance %s -> %s", parent->path, group->path);
+ for (i = 0; i < ARRAY_CARDINALITY(inherit_values); i++) {
+ VIR_AUTOFREE(char *) value = NULL;
+
+ if (virCgroupGetValueStr(parent,
+ VIR_CGROUP_CONTROLLER_CPUSET,
+ inherit_values[i],
+ &value) < 0)
+ return -1;
+
+ VIR_DEBUG("Inherit %s = %s", inherit_values[i], value);
+
+ if (virCgroupSetValueStr(group,
+ VIR_CGROUP_CONTROLLER_CPUSET,
+ inherit_values[i],
+ value) < 0)
+ return -1;
+ }
+
+ return 0;
+}
+
+
+static int
+virCgroupV1SetMemoryUseHierarchy(virCgroupPtr group)
+{
+ unsigned long long value;
+ const char *filename = "memory.use_hierarchy";
+
+ if (virCgroupGetValueU64(group,
+ VIR_CGROUP_CONTROLLER_MEMORY,
+ filename, &value) < 0)
+ return -1;
+
+ /* Setting twice causes error, so if already enabled, skip setting */
+ if (value == 1)
+ return 0;
+
+ VIR_DEBUG("Setting up %s/%s", group->path, filename);
+ if (virCgroupSetValueU64(group,
+ VIR_CGROUP_CONTROLLER_MEMORY,
+ filename, 1) < 0)
+ return -1;
+
+ return 0;
+}
+
+
+static int
+virCgroupV1MakeGroup(virCgroupPtr parent,
+ virCgroupPtr group,
+ bool create,
+ unsigned int flags)
+{
+ size_t i;
+
+ VIR_DEBUG("Make group %s", group->path);
+ for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
+ VIR_AUTOFREE(char *) path = NULL;
+
+ /* We must never mkdir() in systemd's hierarchy */
+ if (i == VIR_CGROUP_CONTROLLER_SYSTEMD) {
+ VIR_DEBUG("Not creating systemd controller group");
+ continue;
+ }
+
+ /* Skip over controllers that aren't mounted */
+ if (!group->controllers[i].mountPoint) {
+ VIR_DEBUG("Skipping unmounted controller %s",
+ virCgroupV1ControllerTypeToString(i));
+ continue;
+ }
+
+ if (virCgroupV1PathOfController(group, i, "", &path) < 0)
+ return -1;
+
+ VIR_DEBUG("Make controller %s", path);
+ if (!virFileExists(path)) {
+ if (!create ||
+ mkdir(path, 0755) < 0) {
+ if (errno == EEXIST)
+ continue;
+ /* With a kernel that doesn't support multi-level directory
+ * for blkio controller, libvirt will fail and disable all
+ * other controllers even though they are available. So
+ * treat blkio as unmounted if mkdir fails. */
+ if (i == VIR_CGROUP_CONTROLLER_BLKIO) {
+ VIR_DEBUG("Ignoring mkdir failure with blkio controller. Kernel probably too old");
+ VIR_FREE(group->controllers[i].mountPoint);
+ continue;
+ } else {
+ virReportSystemError(errno,
+ _("Failed to create v1 controller %s for group"),
+ virCgroupV1ControllerTypeToString(i));
+ return -1;
+ }
+ }
+ if (i == VIR_CGROUP_CONTROLLER_CPUSET &&
+ group->controllers[i].mountPoint != NULL &&
+ virCgroupV1CpuSetInherit(parent, group) < 0) {
+ return -1;
+ }
+ /*
+ * Note that virCgroupV1SetMemoryUseHierarchy should always be
+ * called prior to creating subcgroups and attaching tasks.
+ */
+ if ((flags & VIR_CGROUP_MEM_HIERACHY) &&
+ i == VIR_CGROUP_CONTROLLER_MEMORY &&
+ group->controllers[i].mountPoint != NULL &&
+ virCgroupV1SetMemoryUseHierarchy(group) < 0) {
+ return -1;
+ }
+ }
+ }
+
+ VIR_DEBUG("Done making controllers for group");
+ return 0;
+}
+
+
virCgroupBackend virCgroupV1Backend = {
.type = VIR_CGROUP_BACKEND_TYPE_V1,
@@ -551,6 +682,7 @@ virCgroupBackend virCgroupV1Backend = {
.hasController = virCgroupV1HasController,
.getAnyController = virCgroupV1GetAnyController,
.pathOfController = virCgroupV1PathOfController,
+ .makeGroup = virCgroupV1MakeGroup,
};
--
2.17.1
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