Quoting Tejun Heo (t...@kernel.org):
> Turn on use_hierarchy by default if sane_behavior is specified and
> don't create .use_hierarchy file.
>
> It is debatable whether to remove .use_hierarchy file or make it ro as
> the former could make transition easier in certain cases; however, the
> behavior changes which will be gated by sane_behavior are intensive
> including changing basic meaning of certain control knobs in a few
> controllers and I don't really think keeping this piece would make
> things easier in any noticeable way, so let's remove it.
Hi Tejun,
this actually reminds me of something that's been on my todo list to
report for some time, but I haven't had time to find the source of the
bug... And maybe it's already been reported... but
If I do
cd /sys/fs/cgroup/memory
mkdir b
cd b
echo 1 > memory.use_hierarchy
echo 5000 > memory.limit_in_bytes
cat memory.limit_in_bytes
8192
mkdir c
cd c
cat memory.use_hierarchy
1
cat memory.limit_in_bytes
9223372036854775807
echo $$ > tasks
bash
<killed>
So it seems the hierarchy is being enforced, but not reported in
child limit_in_bytes files.
(Last tested tonight on 3.8.0-17-generic #27-Ubuntu fwiw)
-serge
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