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34f3e25992
This helps to find a common subtree of two resources, which is important when determining whether it's helpful to evict one resource in favor of another. To facilitate this, add a common helper to find the ancestor of two cgroups using each cgroup's ancestor array. Tested-by: Thadeu Lima de Souza Cascardo <cascardo@igalia.com> Reviewed-by: Maarten Lankhorst <dev@lankhorst.se> Reviewed-by: Timur Kristóf <timur.kristof@gmail.com> Signed-off-by: Natalie Vock <natalie.vock@gmx.de> Link: https://patch.msgid.link/20260804-dmemcg-aggressive-protect-v8-2-07af96681bf8@gmx.de