New kernel miracle patch : sched: automated per tty task groups
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Just recompiled the 2.6.37-rc2 kernel adding the cgroup stuff and faced the same behavior: No /sys/fs/cgroup/cpu is created.
Anyway since I don't have time right now to search further, tried the "ubuntu" way (use /dev instead of /sys/fs) and it works (tasks are created under /dev/cgroup/cpu/user/xxx), even though I didn't see any noticeable difference than before.
Hopefully I could do some tests during the weekend