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8347129: cpuset cgroups controller is required for no good reason #3109

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8347129: cpuset cgroups controller is required for no good reason #3109

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10 changes: 6 additions & 4 deletions src/hotspot/os/linux/cgroupSubsystem_linux.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -35,7 +35,7 @@
#include "utilities/globalDefinitions.hpp"

// controller names have to match the *_IDX indices
static const char* cg_controller_name[] = { "cpu", "cpuset", "cpuacct", "memory", "pids" };
static const char* cg_controller_name[] = { "cpuset", "cpu", "cpuacct", "memory", "pids" };

CgroupSubsystem* CgroupSubsystemFactory::create() {
CgroupV1MemoryController* memory = NULL;
Expand Down Expand Up @@ -159,9 +159,10 @@ bool CgroupSubsystemFactory::determine_type(CgroupInfo* cg_infos,
char buf[MAXPATHLEN+1];
char *p;
bool is_cgroupsV2;
// true iff all required controllers, memory, cpu, cpuset, cpuacct are enabled
// true iff all required controllers, memory, cpu, cpuacct are enabled
// at the kernel level.
// pids might not be enabled on older Linux distros (SLES 12.1, RHEL 7.1)
// cpuset might not be enabled on newer Linux distros (Fedora 41)
bool all_required_controllers_enabled;

/*
Expand Down Expand Up @@ -193,6 +194,7 @@ bool CgroupSubsystemFactory::determine_type(CgroupInfo* cg_infos,
cg_infos[MEMORY_IDX]._hierarchy_id = hierarchy_id;
cg_infos[MEMORY_IDX]._enabled = (enabled == 1);
} else if (strcmp(name, "cpuset") == 0) {
log_debug(os, container)("Detected optional cpuset controller entry in %s", proc_cgroups);
cg_infos[CPUSET_IDX]._name = os::strdup(name);
cg_infos[CPUSET_IDX]._hierarchy_id = hierarchy_id;
cg_infos[CPUSET_IDX]._enabled = (enabled == 1);
Expand All @@ -216,8 +218,8 @@ bool CgroupSubsystemFactory::determine_type(CgroupInfo* cg_infos,
is_cgroupsV2 = true;
all_required_controllers_enabled = true;
for (int i = 0; i < CG_INFO_LENGTH; i++) {
// pids controller is optional. All other controllers are required
if (i != PIDS_IDX) {
// pids and cpuset controllers are optional. All other controllers are required
if (i != PIDS_IDX && i != CPUSET_IDX) {
is_cgroupsV2 = is_cgroupsV2 && cg_infos[i]._hierarchy_id == 0;
all_required_controllers_enabled = all_required_controllers_enabled && cg_infos[i]._enabled;
}
Expand Down