[Devel] Re: [PATCH v4 02/11] memcg: document cgroup dirty memory interfaces

[Greg Thelen]

Andrew Morton <akpm at linux-foundation.org> writes:

> On Fri, 29 Oct 2010 00:09:05 -0700
> Greg Thelen <gthelen at google.com> wrote:
>
>> Document cgroup dirty memory interfaces and statistics.
>> 
>>
>> ...
>>
>> +When use_hierarchy=0, each cgroup has dirty memory usage and limits.
>> +System-wide dirty limits are also consulted.  Dirty memory consumption is
>> +checked against both system-wide and per-cgroup dirty limits.
>> +
>> +The current implementation does enforce per-cgroup dirty limits when
>
> "does not", I trust.

Correct.  Thanks.

>> +use_hierarchy=1.  System-wide dirty limits are used for processes in such
>> +cgroups.  Attempts to read memory.dirty_* files return the system-wide values.
>> +Writes to the memory.dirty_* files return error.  An enhanced implementation is
>> +needed to check the chain of parents to ensure that no dirty limit is exceeded.
>> +
>>  6. Hierarchy support
>>  
>>  The memory controller supports a deep hierarchy and hierarchical accounting.
>> -- 
>> 1.7.3.1
>
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