On 06/26/2012 06:11 PM, Johannes Weiner wrote:

I find the warning message a bit terse.  Maybe include something like
"restructure the cgroup directory structure to match your accounting
requirements or complain to (linux-mm, cgroups list etc.)  if not
possible"

How about:

WARN_ONCE(!parent_memcg && memcg->use_hierarchy,
    "Non-hierarchical memcg is considered for deprecation\n"
    "Please consider reorganizing your tree to work with hierarchical 
accounting\n"
    "If you have any reason not to, let us know at 
cgroups@vger.kernel.org\n");


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