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From cb154a1d153edf2c399493a4336aebdccdc628f5 Mon Sep 17 00:00:00 2001
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Message-Id: <cb154a1d153edf2c399493a4336aebdccdc628f5@dist-git>
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From: Pavel Hrdina <phrdina@redhat.com>
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Date: Mon, 1 Jul 2019 17:07:27 +0200
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Subject: [PATCH] vircgroup: introduce virCgroupV2AddTask
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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In cgroups v2 we need to handle threads and processes differently.
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If you need to move a process you need to write its pid into
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cgrou.procs file and it will move the process with all its threads
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as well. The whole process will be moved if you use tid of any thread.
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In order to move only threads at first we need to create threaded group
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and after that we can write the relevant thread tids into cgroup.threads
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file. Threads can be moved only into cgroups that are children of
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cgroup of its process.
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Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
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(cherry picked from commit 48572f8825f2bbd7dabb5afb34efbf7afa2f7302)
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Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1689297
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Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
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Message-Id: <d6fb582c80903fc7725e2dd15165bd167c916f04.1561993100.git.phrdina@redhat.com>
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Reviewed-by: Ján Tomko <jtomko@redhat.com>
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---
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src/util/vircgroupv2.c | 15 +++++++++++++++
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1 file changed, 15 insertions(+)
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diff --git a/src/util/vircgroupv2.c b/src/util/vircgroupv2.c
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index b5fad47ca0..6ffb5ce786 100644
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--- a/src/util/vircgroupv2.c
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+++ b/src/util/vircgroupv2.c
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@@ -432,6 +432,20 @@ virCgroupV2Remove(virCgroupPtr group)
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}
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+static int
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+virCgroupV2AddTask(virCgroupPtr group,
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+ pid_t pid,
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+ unsigned int flags)
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+{
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+ int controller = virCgroupV2GetAnyController(group);
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+
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+ if (flags & VIR_CGROUP_TASK_THREAD)
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+ return virCgroupSetValueI64(group, controller, "cgroup.threads", pid);
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+ else
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+ return virCgroupSetValueI64(group, controller, "cgroup.procs", pid);
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+}
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+
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+
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virCgroupBackend virCgroupV2Backend = {
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.type = VIR_CGROUP_BACKEND_TYPE_V2,
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@@ -449,6 +463,7 @@ virCgroupBackend virCgroupV2Backend = {
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.pathOfController = virCgroupV2PathOfController,
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.makeGroup = virCgroupV2MakeGroup,
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.remove = virCgroupV2Remove,
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+ .addTask = virCgroupV2AddTask,
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};
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--
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2.22.0
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