[libvirt] [PATCH v2 1/6] util: vircgroup: pass parent cgroup into virCgroupDetectControllersCB

In cgroups v2 we don't have to detect available controllers every single time if we are creating a new cgroup based on parent cgroup. Signed-off-by: Pavel Hrdina <phrdina(a)redhat.com&gt; Reviewed-by: Ján Tomko <jtomko(a)redhat.com&gt; --- src/util/vircgroup.c | 2 +- src/util/vircgroupbackend.h | 3 ++- src/util/vircgroupv1.c | 3 ++- src/util/vircgroupv2.c | 17 +++++++++++------ 4 files changed, 16 insertions(+), 9 deletions(-) diff --git a/src/util/vircgroup.c b/src/util/vircgroup.c index e32215935b..b7e5f03521 100644 --- a/src/util/vircgroup.c +++ b/src/util/vircgroup.c @@ -383,7 +383,7 @@ virCgroupDetect(virCgroupPtr group, for (i = 0; i < VIR_CGROUP_BACKEND_TYPE_LAST; i++) { if (group->backends[i]) { - int rc = group->backends[i]->detectControllers(group, controllers); + int rc = group->backends[i]->detectControllers(group, controllers, parent); if (rc < 0) return -1; controllersAvailable |= rc; diff --git a/src/util/vircgroupbackend.h b/src/util/vircgroupbackend.h index e58e327c68..1fe0851184 100644 --- a/src/util/vircgroupbackend.h +++ b/src/util/vircgroupbackend.h @@ -95,7 +95,8 @@ typedef char * typedef int (*virCgroupDetectControllersCB)(virCgroupPtr group, - int controllers); + int controllers, + virCgroupPtr parent); typedef bool (*virCgroupHasControllerCB)(virCgroupPtr cgroup, diff --git a/src/util/vircgroupv1.c b/src/util/vircgroupv1.c index 97258917bc..fb3e0b2d47 100644 --- a/src/util/vircgroupv1.c +++ b/src/util/vircgroupv1.c @@ -420,7 +420,8 @@ virCgroupV1StealPlacement(virCgroupPtr group) static int virCgroupV1DetectControllers(virCgroupPtr group, - int controllers) + int controllers, + virCgroupPtr parent ATTRIBUTE_UNUSED) { size_t i; size_t j; diff --git a/src/util/vircgroupv2.c b/src/util/vircgroupv2.c index 1179c4459a..2d09d77a29 100644 --- a/src/util/vircgroupv2.c +++ b/src/util/vircgroupv2.c @@ -285,16 +285,21 @@ virCgroupV2ParseControllersFile(virCgroupPtr group) static int virCgroupV2DetectControllers(virCgroupPtr group, - int controllers) + int controllers, + virCgroupPtr parent) { size_t i; - if (virCgroupV2ParseControllersFile(group) < 0) - return -1; + if (parent) { + group->unified.controllers = parent->unified.controllers; + } else { + if (virCgroupV2ParseControllersFile(group) < 0) + return -1; - /* In cgroup v2 there is no cpuacct controller, the cpu.stat file always - * exists with usage stats. */ - group->unified.controllers |= 1 << VIR_CGROUP_CONTROLLER_CPUACCT; + /* In cgroup v2 there is no cpuacct controller, the cpu.stat file always + * exists with usage stats. */ + group->unified.controllers |= 1 << VIR_CGROUP_CONTROLLER_CPUACCT; + } for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) VIR_DEBUG("Controller '%s' present=%s", -- 2.21.0