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vircgroup: introduce virCgroupV2AddTask

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In cgroups v2 we need to handle threads and processes differently.
If you need to move a process you need to write its pid into
cgrou.procs file and it will move the process with all its threads
as well.  The whole process will be moved if you use tid of any thread.

In order to move only threads at first we need to create threaded group
and after that we can write the relevant thread tids into cgroup.threads
file.  Threads can be moved only into cgroups that are children of
cgroup of its process.

Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
This commit is contained in:
Pavel Hrdina 2018-08-17 16:49:33 +02:00
parent 4fe4847438
commit 48572f8825
1 changed files with 15 additions and 0 deletions
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15
src/util/vircgroupv2.c
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@ -431,6 +431,20 @@ virCgroupV2Remove(virCgroupPtr group)
}
static int
virCgroupV2AddTask(virCgroupPtr group,
pid_t pid,
unsigned int flags)
{
int controller = virCgroupV2GetAnyController(group);
if (flags & VIR_CGROUP_TASK_THREAD)
return virCgroupSetValueI64(group, controller, "cgroup.threads", pid);
else
return virCgroupSetValueI64(group, controller, "cgroup.procs", pid);
}
virCgroupBackend virCgroupV2Backend = {
.type = VIR_CGROUP_BACKEND_TYPE_V2,
@ -448,6 +462,7 @@ virCgroupBackend virCgroupV2Backend = {
.pathOfController = virCgroupV2PathOfController,
.makeGroup = virCgroupV2MakeGroup,
.remove = virCgroupV2Remove,
.addTask = virCgroupV2AddTask,
};