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vircgroup: introduce nested cgroup to properly work with systemd

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When running on host with systemd we register VMs with machined.
In this case systemd creates the root VM cgroup for us. This has some
implications where one of them is that systemd owns all files inside
the root VM cgroup and we should not touch them.

We already use DBus calls for some of the APIs but for the remaining
ones we will continue accessing the files directly. Systemd doesn't
support threaded cgroups so we need to do this.

The reason why we don't use DBus for most of the APIs is that we already
have a code that works with files and we would have to check if systemd
supports each API.

This change introduces new topology on systemd hosts:

$ROOT
  |
  +- machine.slice
     |
     +- machine-qemu\x2d1\x2dvm1.scope
        |
        +- libvirt
           |
           +- emulator
           +- vcpu0
           +- vcpu0

compared to the previous topology:

$ROOT
  |
  +- machine.slice
     |
     +- machine-qemu\x2d1\x2dvm1.scope
        |
        +- emulator
        +- vcpu0
        +- vcpu0

Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Pavel Hrdina
2021-02-09 12:33:53 +01:00
parent badc2bcc73
commit 184245f53b
5 changed files with 239 additions and 65 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
docs/cgroups.html.in
View File

@@ -117,21 +117,27 @@ $ROOT
|
+- machine-qemu\x2d1\x2dvm1.scope
| |
| +- emulator
| +- vcpu0
| +- vcpu1
| +- libvirt
| |
| +- emulator
| +- vcpu0
| +- vcpu1
|
+- machine-qemu\x2d2\x2dvm2.scope
| |
| +- emulator
| +- vcpu0
| +- vcpu1
| +- libvirt
| |
| +- emulator
| +- vcpu0
| +- vcpu1
|
+- machine-qemu\x2d3\x2dvm3.scope
| |
| +- emulator
| +- vcpu0
| +- vcpu1
| +- libvirt
| |
| +- emulator
| +- vcpu0
| +- vcpu1
|
+- machine-engineering.slice
| |
@@ -148,6 +154,11 @@ $ROOT
+- machine-lxc\x2d33333\x2dcontainer3.scope
</pre>
<p>
Prior libvirt 7.1.0 the topology doesn't have extra
<code>libvirt</code> directory.
</p>
<h3><a id="currentLayoutGeneric">Non-systemd cgroups layout</a></h3>
<p>

250
src/util/vircgroup.c
View File

@@ -711,6 +711,22 @@ virCgroupMakeGroup(virCgroupPtr parent,
}
static bool
virCgroupExists(virCgroupPtr group)
{
size_t i;
for (i = 0; i < VIR_CGROUP_BACKEND_TYPE_LAST; i++) {
if (group->backends[i] &&
!group->backends[i]->exists(group)) {
return false;
}
}
return true;
}
/**
* virCgroupNew:
* @path: path for the new group
@@ -764,10 +780,11 @@ virCgroupAddTaskInternal(virCgroupPtr group,
unsigned int flags)
{
size_t i;
virCgroupPtr parent = virCgroupGetNested(group);
for (i = 0; i < VIR_CGROUP_BACKEND_TYPE_LAST; i++) {
if (group->backends[i] &&
group->backends[i]->addTask(group, pid, flags) < 0) {
if (parent->backends[i] &&
parent->backends[i]->addTask(parent, pid, flags) < 0) {
return -1;
}
}
@@ -980,6 +997,28 @@ virCgroupNewPartition(const char *path,
}
static int
virCgroupNewNested(virCgroupPtr parent,
int controllers,
bool create,
pid_t pid,
virCgroupPtr *nested)
{
g_autoptr(virCgroup) new = NULL;
if (virCgroupNewFromParent(parent, "libvirt", controllers, &new) < 0)
return -1;
if (create) {
if (virCgroupMakeGroup(parent, new, create, pid, VIR_CGROUP_NONE) < 0)
return -1;
}
*nested = g_steal_pointer(&new);
return 0;
}
/**
* virCgroupNewSelf:
*
@@ -1064,6 +1103,7 @@ virCgroupNewThread(virCgroupPtr domain,
{
g_autofree char *name = NULL;
g_autoptr(virCgroup) newGroup = NULL;
virCgroupPtr parent = NULL;
int controllers;
*group = NULL;
@@ -1088,10 +1128,12 @@ virCgroupNewThread(virCgroupPtr domain,
(1 << VIR_CGROUP_CONTROLLER_CPUACCT) |
(1 << VIR_CGROUP_CONTROLLER_CPUSET));
if (virCgroupNewFromParent(domain, name, controllers, &newGroup) < 0)
parent = virCgroupGetNested(domain);
if (virCgroupNewFromParent(parent, name, controllers, &newGroup) < 0)
return -1;
if (virCgroupMakeGroup(domain, newGroup, create, -1, VIR_CGROUP_THREAD) < 0)
if (virCgroupMakeGroup(parent, newGroup, create, -1, VIR_CGROUP_THREAD) < 0)
return -1;
*group = g_steal_pointer(&newGroup);
@@ -1142,6 +1184,7 @@ virCgroupNewDetectMachine(const char *name,
{
size_t i;
g_autoptr(virCgroup) newGroup = NULL;
g_autoptr(virCgroup) nested = NULL;
*group = NULL;
@@ -1166,6 +1209,12 @@ virCgroupNewDetectMachine(const char *name,
if (virSystemdHasMachined() == 0 && !newGroup->unitName)
return -1;
if (virCgroupNewNested(newGroup, controllers, false, -1, &nested) < 0)
return -1;
if (virCgroupExists(nested))
newGroup->nested = g_steal_pointer(&nested);
*group = g_steal_pointer(&newGroup);
return 0;
}
@@ -1225,6 +1274,7 @@ virCgroupNewMachineSystemd(const char *name,
int rv;
g_autoptr(virCgroup) init = NULL;
g_autoptr(virCgroup) newGroup = NULL;
g_autoptr(virCgroup) nested = NULL;
g_autofree char *path = NULL;
size_t i;
@@ -1270,6 +1320,11 @@ virCgroupNewMachineSystemd(const char *name,
if (!newGroup->unitName)
return -1;
if (virCgroupNewNested(newGroup, controllers, true, pidleader, &nested) < 0)
return -1;
newGroup->nested = g_steal_pointer(&nested);
if (virCgroupAddProcess(newGroup, pidleader) < 0) {
virErrorPtr saved;
@@ -1457,7 +1512,9 @@ virCgroupGetBlkioIoServiced(virCgroupPtr group,
long long *requests_read,
long long *requests_write)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_BLKIO,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_BLKIO,
getBlkioIoServiced, -1,
bytes_read, bytes_write,
requests_read, requests_write);
@@ -1484,7 +1541,9 @@ virCgroupGetBlkioIoDeviceServiced(virCgroupPtr group,
long long *requests_read,
long long *requests_write)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_BLKIO,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_BLKIO,
getBlkioIoDeviceServiced, -1,
path, bytes_read, bytes_write,
requests_read, requests_write);
@@ -1535,7 +1594,9 @@ virCgroupSetBlkioDeviceReadIops(virCgroupPtr group,
const char *path,
unsigned int riops)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_BLKIO,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_BLKIO,
setBlkioDeviceReadIops, -1, path, riops);
}
@@ -1553,7 +1614,9 @@ virCgroupSetBlkioDeviceWriteIops(virCgroupPtr group,
const char *path,
unsigned int wiops)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_BLKIO,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_BLKIO,
setBlkioDeviceWriteIops, -1, path, wiops);
}
@@ -1571,7 +1634,9 @@ virCgroupSetBlkioDeviceReadBps(virCgroupPtr group,
const char *path,
unsigned long long rbps)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_BLKIO,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_BLKIO,
setBlkioDeviceReadBps, -1, path, rbps);
}
@@ -1588,7 +1653,9 @@ virCgroupSetBlkioDeviceWriteBps(virCgroupPtr group,
const char *path,
unsigned long long wbps)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_BLKIO,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_BLKIO,
setBlkioDeviceWriteBps, -1, path, wbps);
}
@@ -1624,7 +1691,9 @@ virCgroupGetBlkioDeviceReadIops(virCgroupPtr group,
const char *path,
unsigned int *riops)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_BLKIO,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_BLKIO,
getBlkioDeviceReadIops, -1, path, riops);
}
@@ -1641,7 +1710,9 @@ virCgroupGetBlkioDeviceWriteIops(virCgroupPtr group,
const char *path,
unsigned int *wiops)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_BLKIO,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_BLKIO,
getBlkioDeviceWriteIops, -1, path, wiops);
}
@@ -1658,7 +1729,9 @@ virCgroupGetBlkioDeviceReadBps(virCgroupPtr group,
const char *path,
unsigned long long *rbps)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_BLKIO,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_BLKIO,
getBlkioDeviceReadBps, -1, path, rbps);
}
@@ -1675,7 +1748,9 @@ virCgroupGetBlkioDeviceWriteBps(virCgroupPtr group,
const char *path,
unsigned long long *wbps)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_BLKIO,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_BLKIO,
getBlkioDeviceWriteBps, -1, path, wbps);
}
@@ -1708,7 +1783,9 @@ virCgroupGetBlkioDeviceWeight(virCgroupPtr group,
int
virCgroupSetMemory(virCgroupPtr group, unsigned long long kb)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_MEMORY,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_MEMORY,
setMemory, -1, kb);
}
@@ -1735,7 +1812,9 @@ virCgroupGetMemoryStat(virCgroupPtr group,
unsigned long long *inactiveFile,
unsigned long long *unevictable)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_MEMORY,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_MEMORY,
getMemoryStat, -1, cache,
activeAnon, inactiveAnon,
activeFile, inactiveFile,
@@ -1754,7 +1833,9 @@ virCgroupGetMemoryStat(virCgroupPtr group,
int
virCgroupGetMemoryUsage(virCgroupPtr group, unsigned long *kb)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_MEMORY,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_MEMORY,
getMemoryUsage, -1, kb);
}
@@ -1770,7 +1851,9 @@ virCgroupGetMemoryUsage(virCgroupPtr group, unsigned long *kb)
int
virCgroupSetMemoryHardLimit(virCgroupPtr group, unsigned long long kb)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_MEMORY,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_MEMORY,
setMemoryHardLimit, -1, kb);
}
@@ -1786,7 +1869,9 @@ virCgroupSetMemoryHardLimit(virCgroupPtr group, unsigned long long kb)
int
virCgroupGetMemoryHardLimit(virCgroupPtr group, unsigned long long *kb)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_MEMORY,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_MEMORY,
getMemoryHardLimit, -1, kb);
}
@@ -1802,7 +1887,9 @@ virCgroupGetMemoryHardLimit(virCgroupPtr group, unsigned long long *kb)
int
virCgroupSetMemorySoftLimit(virCgroupPtr group, unsigned long long kb)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_MEMORY,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_MEMORY,
setMemorySoftLimit, -1, kb);
}
@@ -1818,7 +1905,9 @@ virCgroupSetMemorySoftLimit(virCgroupPtr group, unsigned long long kb)
int
virCgroupGetMemorySoftLimit(virCgroupPtr group, unsigned long long *kb)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_MEMORY,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_MEMORY,
getMemorySoftLimit, -1, kb);
}
@@ -1834,7 +1923,9 @@ virCgroupGetMemorySoftLimit(virCgroupPtr group, unsigned long long *kb)
int
virCgroupSetMemSwapHardLimit(virCgroupPtr group, unsigned long long kb)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_MEMORY,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_MEMORY,
setMemSwapHardLimit, -1, kb);
}
@@ -1850,7 +1941,9 @@ virCgroupSetMemSwapHardLimit(virCgroupPtr group, unsigned long long kb)
int
virCgroupGetMemSwapHardLimit(virCgroupPtr group, unsigned long long *kb)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_MEMORY,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_MEMORY,
getMemSwapHardLimit, -1, kb);
}
@@ -1866,7 +1959,9 @@ virCgroupGetMemSwapHardLimit(virCgroupPtr group, unsigned long long *kb)
int
virCgroupGetMemSwapUsage(virCgroupPtr group, unsigned long long *kb)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_MEMORY,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_MEMORY,
getMemSwapUsage, -1, kb);
}
@@ -1882,7 +1977,9 @@ virCgroupGetMemSwapUsage(virCgroupPtr group, unsigned long long *kb)
int
virCgroupSetCpusetMems(virCgroupPtr group, const char *mems)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_CPUSET,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_CPUSET,
setCpusetMems, -1, mems);
}
@@ -1898,7 +1995,9 @@ virCgroupSetCpusetMems(virCgroupPtr group, const char *mems)
int
virCgroupGetCpusetMems(virCgroupPtr group, char **mems)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_CPUSET,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_CPUSET,
getCpusetMems, -1, mems);
}
@@ -1914,7 +2013,9 @@ virCgroupGetCpusetMems(virCgroupPtr group, char **mems)
int
virCgroupSetCpusetMemoryMigrate(virCgroupPtr group, bool migrate)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_CPUSET,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_CPUSET,
setCpusetMemoryMigrate, -1, migrate);
}
@@ -1930,7 +2031,9 @@ virCgroupSetCpusetMemoryMigrate(virCgroupPtr group, bool migrate)
int
virCgroupGetCpusetMemoryMigrate(virCgroupPtr group, bool *migrate)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_CPUSET,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_CPUSET,
getCpusetMemoryMigrate, -1, migrate);
}
@@ -1946,7 +2049,9 @@ virCgroupGetCpusetMemoryMigrate(virCgroupPtr group, bool *migrate)
int
virCgroupSetCpusetCpus(virCgroupPtr group, const char *cpus)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_CPUSET,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_CPUSET,
setCpusetCpus, -1, cpus);
}
@@ -1962,7 +2067,9 @@ virCgroupSetCpusetCpus(virCgroupPtr group, const char *cpus)
int
virCgroupGetCpusetCpus(virCgroupPtr group, char **cpus)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_CPUSET,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_CPUSET,
getCpusetCpus, -1, cpus);
}
@@ -1977,7 +2084,9 @@ virCgroupGetCpusetCpus(virCgroupPtr group, char **cpus)
int
virCgroupDenyAllDevices(virCgroupPtr group)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_DEVICES,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_DEVICES,
denyAllDevices, -1);
}
@@ -1998,7 +2107,9 @@ virCgroupDenyAllDevices(virCgroupPtr group)
int
virCgroupAllowAllDevices(virCgroupPtr group, int perms)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_DEVICES,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_DEVICES,
allowAllDevices, -1, perms);
}
@@ -2018,7 +2129,9 @@ int
virCgroupAllowDevice(virCgroupPtr group, char type, int major, int minor,
int perms)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_DEVICES,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_DEVICES,
allowDevice, -1, type, major, minor, perms);
}
@@ -2044,6 +2157,7 @@ virCgroupAllowDevicePath(virCgroupPtr group,
bool ignoreEacces)
{
struct stat sb;
virCgroupPtr parent = virCgroupGetNested(group);
if (stat(path, &sb) < 0) {
if (errno == EACCES && ignoreEacces)
@@ -2058,7 +2172,7 @@ virCgroupAllowDevicePath(virCgroupPtr group,
if (!S_ISCHR(sb.st_mode) && !S_ISBLK(sb.st_mode))
return 1;
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_DEVICES,
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_DEVICES,
allowDevice, -1,
S_ISCHR(sb.st_mode) ? 'c' : 'b',
major(sb.st_rdev),
@@ -2082,7 +2196,9 @@ int
virCgroupDenyDevice(virCgroupPtr group, char type, int major, int minor,
int perms)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_DEVICES,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_DEVICES,
denyDevice, -1, type, major, minor, perms);
}
@@ -2108,6 +2224,7 @@ virCgroupDenyDevicePath(virCgroupPtr group,
bool ignoreEacces)
{
struct stat sb;
virCgroupPtr parent = virCgroupGetNested(group);
if (stat(path, &sb) < 0) {
if (errno == EACCES && ignoreEacces)
@@ -2122,7 +2239,7 @@ virCgroupDenyDevicePath(virCgroupPtr group,
if (!S_ISCHR(sb.st_mode) && !S_ISBLK(sb.st_mode))
return 1;
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_DEVICES,
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_DEVICES,
denyDevice, -1,
S_ISCHR(sb.st_mode) ? 'c' : 'b',
major(sb.st_rdev),
@@ -2383,7 +2500,9 @@ virCgroupGetCpuShares(virCgroupPtr group, unsigned long long *shares)
int
virCgroupSetCpuCfsPeriod(virCgroupPtr group, unsigned long long cfs_period)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_CPU,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_CPU,
setCpuCfsPeriod, -1, cfs_period);
}
@@ -2399,7 +2518,9 @@ virCgroupSetCpuCfsPeriod(virCgroupPtr group, unsigned long long cfs_period)
int
virCgroupGetCpuCfsPeriod(virCgroupPtr group, unsigned long long *cfs_period)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_CPU,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_CPU,
getCpuCfsPeriod, -1, cfs_period);
}
@@ -2416,7 +2537,9 @@ virCgroupGetCpuCfsPeriod(virCgroupPtr group, unsigned long long *cfs_period)
int
virCgroupSetCpuCfsQuota(virCgroupPtr group, long long cfs_quota)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_CPU,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_CPU,
setCpuCfsQuota, -1, cfs_quota);
}
@@ -2424,7 +2547,9 @@ virCgroupSetCpuCfsQuota(virCgroupPtr group, long long cfs_quota)
int
virCgroupGetCpuacctPercpuUsage(virCgroupPtr group, char **usage)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_CPUACCT,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_CPUACCT,
getCpuacctPercpuUsage, -1, usage);
}
@@ -2727,7 +2852,9 @@ virCgroupKillPainfully(virCgroupPtr group)
int
virCgroupGetCpuCfsQuota(virCgroupPtr group, long long *cfs_quota)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_CPU,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_CPU,
getCpuCfsQuota, -1, cfs_quota);
}
@@ -2735,7 +2862,9 @@ virCgroupGetCpuCfsQuota(virCgroupPtr group, long long *cfs_quota)
int
virCgroupGetCpuacctUsage(virCgroupPtr group, unsigned long long *usage)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_CPUACCT,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_CPUACCT,
getCpuacctUsage, -1, usage);
}
@@ -2744,7 +2873,9 @@ int
virCgroupGetCpuacctStat(virCgroupPtr group, unsigned long long *user,
unsigned long long *sys)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_CPUACCT,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_CPUACCT,
getCpuacctStat, -1, user, sys);
}
@@ -2752,7 +2883,9 @@ virCgroupGetCpuacctStat(virCgroupPtr group, unsigned long long *user,
int
virCgroupSetFreezerState(virCgroupPtr group, const char *state)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_FREEZER,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_FREEZER,
setFreezerState, -1, state);
}
@@ -2760,7 +2893,9 @@ virCgroupSetFreezerState(virCgroupPtr group, const char *state)
int
virCgroupGetFreezerState(virCgroupPtr group, char **state)
{
VIR_CGROUP_BACKEND_CALL(group, VIR_CGROUP_CONTROLLER_FREEZER,
virCgroupPtr parent = virCgroupGetNested(group);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_FREEZER,
getFreezerState, -1, state);
}
@@ -2770,10 +2905,11 @@ virCgroupBindMount(virCgroupPtr group, const char *oldroot,
const char *mountopts)
{
size_t i;
virCgroupPtr parent = virCgroupGetNested(group);
for (i = 0; i < VIR_CGROUP_BACKEND_TYPE_LAST; i++) {
if (group->backends[i] &&
group->backends[i]->bindMount(group, oldroot, mountopts) < 0) {
if (parent->backends[i] &&
parent->backends[i]->bindMount(parent, oldroot, mountopts) < 0) {
return -1;
}
}
@@ -2788,10 +2924,11 @@ int virCgroupSetOwner(virCgroupPtr cgroup,
int controllers)
{
size_t i;
virCgroupPtr parent = virCgroupGetNested(cgroup);
for (i = 0; i < VIR_CGROUP_BACKEND_TYPE_LAST; i++) {
if (cgroup->backends[i] &&
cgroup->backends[i]->setOwner(cgroup, uid, gid, controllers) < 0) {
if (parent->backends[i] &&
parent->backends[i]->setOwner(parent, uid, gid, controllers) < 0) {
return -1;
}
}
@@ -2810,7 +2947,9 @@ int virCgroupSetOwner(virCgroupPtr cgroup,
bool
virCgroupSupportsCpuBW(virCgroupPtr cgroup)
{
VIR_CGROUP_BACKEND_CALL(cgroup, VIR_CGROUP_CONTROLLER_CPU,
virCgroupPtr parent = virCgroupGetNested(cgroup);
VIR_CGROUP_BACKEND_CALL(parent, VIR_CGROUP_CONTROLLER_CPU,
supportsCpuBW, false);
}
@@ -2818,10 +2957,11 @@ int
virCgroupHasEmptyTasks(virCgroupPtr cgroup, int controller)
{
size_t i;
virCgroupPtr parent = virCgroupGetNested(cgroup);
for (i = 0; i < VIR_CGROUP_BACKEND_TYPE_LAST; i++) {
if (cgroup->backends[i]) {
int rc = cgroup->backends[i]->hasEmptyTasks(cgroup, controller);
if (parent->backends[i]) {
int rc = parent->backends[i]->hasEmptyTasks(parent, controller);
if (rc <= 0)
return rc;
}
@@ -3630,6 +3770,7 @@ virCgroupFree(virCgroupPtr group)
g_free(group->unified.mountPoint);
g_free(group->unified.placement);
g_free(group->unitName);
g_free(group->nested);
g_free(group);
}
@@ -3641,9 +3782,12 @@ virCgroupDelThread(virCgroupPtr cgroup,
int idx)
{
g_autoptr(virCgroup) new_cgroup = NULL;
virCgroupPtr parent = NULL;
if (cgroup) {
if (virCgroupNewThread(cgroup, nameval, idx, false, &new_cgroup) < 0)
parent = virCgroupGetNested(cgroup);
if (virCgroupNewThread(parent, nameval, idx, false, &new_cgroup) < 0)
return -1;
/* Remove the offlined cgroup */

4
src/util/vircgrouppriv.h
View File

@@ -66,8 +66,12 @@ struct _virCgroup {
virCgroupV2Controller unified;
char *unitName;
virCgroupPtr nested;
};
#define virCgroupGetNested(cgroup) \
(cgroup->nested ? cgroup->nested : cgroup)
int virCgroupSetValueDBus(const char *unitName,
const char *key,
GVariant *value);

15
src/util/vircgroupv1.c
View File

@@ -338,6 +338,8 @@ virCgroupV1DetectPlacement(virCgroupPtr group,
for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
const char *typestr = virCgroupV1ControllerTypeToString(i);
g_autofree char* placement = NULL;
char *tmp = NULL;
if (!virCgroupV1MountOptsMatchController(controllers, typestr))
continue;
@@ -348,17 +350,24 @@ virCgroupV1DetectPlacement(virCgroupPtr group,
if (group->legacy[i].placement)
continue;
/* On systemd we create a nested cgroup for some cgroup tasks
* but the placement should point to the root cgroup. */
placement = g_strdup(selfpath);
tmp = g_strrstr(placement, "/libvirt");
if (tmp)
*tmp = '\0';
/*
* selfpath == "/" + path="" -> "/"
* selfpath == "/libvirt.service" + path == "" -> "/libvirt.service"
* selfpath == "/libvirt.service" + path == "foo" -> "/libvirt.service/foo"
*/
if (i == VIR_CGROUP_CONTROLLER_SYSTEMD) {
group->legacy[i].placement = g_strdup(selfpath);
group->legacy[i].placement = g_strdup(placement);
} else {
bool delim = STREQ(selfpath, "/") || STREQ(path, "");
bool delim = STREQ(placement, "/") || STREQ(path, "");
group->legacy[i].placement = g_strdup_printf("%s%s%s", selfpath,
group->legacy[i].placement = g_strdup_printf("%s%s%s", placement,
delim ? "" : "/",
path);
}

6
src/util/vircgroupv2.c
View File

@@ -208,6 +208,12 @@ virCgroupV2DetectPlacement(virCgroupPtr group,
if (tmp)
*tmp = '\0';
/* On systemd we create a nested cgroup for some cgroup tasks
* but the placement should point to the root cgroup. */
tmp = g_strrstr(placement, "/libvirt");
if (tmp)
*tmp = '\0';
/*
* selfpath == "/" + path="" -> "/"
* selfpath == "/libvirt.service" + path == "" -> "/libvirt.service"