>> cgrp->subsys[i] = NULL;
>> root->subsys_bits &= ~bit;
>> - rootnode.subsys_bits |= bit;
>> + if (singleton)
>> + rootnode.subsys_bits |= bit;
>
> initially we can see all subsystems in /proc/cgroups, but:
>
Ah, I just notice debug_subsys will never be in rootnode. But this is a bit odd,
and one of the use of /proc/cgroups is to check if a subsystem is supported or
not, so we can no longer do this:
#! /bin/sh
grep -q debug /proc/cgroups
if [ $? -ne 0 ]; then
echo "debug subsystem is not compiled into kernel"
exit 1
fi
# mount debug_subsys and do something with it...
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