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Emit warning if memory.peak cannot be be captured with cgroup v2. #2775

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Nov 3, 2024
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Emit warning if memory.peak cannot be be captured with cgroup v2. #2775

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10 changes: 8 additions & 2 deletions judge/create_cgroups.in
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Original file line number Diff line number Diff line change
Expand Up @@ -21,11 +21,17 @@ cgroup_error_and_usage () {
# Check whether cgroup v2 is available.
fs_type=$(awk '$2 == "/sys/fs/cgroup" {print $3}' /proc/mounts)
if [ "$fs_type" = "cgroup2" ]; then
kernel_version=$(uname -r)
major=$(echo "$kernel_version" | cut -d '.' -f 1)
minor=$(echo "$kernel_version" | cut -d '.' -f 2)
if [ "$major" -lt 5 ] || { [ "$major" -eq 5 ] && [ "$minor" -lt 19 ]; }; then
echo "WARNING: Kernel ($kernel_version) is too old to record peak RAM usage" >&2
fi
if ! echo "+memory" >> /sys/fs/cgroup/cgroup.subtree_control; then
cgroup_error_and_usage "Error: Cannot add +memory to cgroup.subtree_control; check kernel params. Unable to continue."
cgroup_error_and_usage "Error: Cannot add +memory to cgroup.subtree_control; check kernel params. Unable to continue."
fi
if ! echo "+cpuset" >> /sys/fs/cgroup/cgroup.subtree_control; then
cgroup_error_and_usage "Error: Cannot add +cpuset to cgroup.subtree_control; check kernel params. Unable to continue."
cgroup_error_and_usage "Error: Cannot add +cpuset to cgroup.subtree_control; check kernel params. Unable to continue."
fi
exit 0
fi
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