Re: [PATCH 1/6] res_counter: handle limit change

[Balbir Singh <balbir@linux.vnet.ibm.com>]

KAMEZAWA Hiroyuki wrote:
> Add a support to shrink_usage_at_limit_change feature to res_counter.
> memcg will use this to drop pages.
> 
> Change log: xxx -> v4 (new file.)
>  - cut out the limit-change part from hierarchy patch set.
>  - add "retry_count" arguments to shrink_usage(). This allows that we don't
>    have to set the default retry loop count.
>  - res_counter_check_under_val() is added to support subsystem.
>  - res_counter_init() is res_counter_init_ops(cnt, NULL)
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
> 

Does shrink_usage() really belong to res_counters? Could a task limiter, a
CPU/IO bandwidth controller use this callback? Resource Counters were designed
to be generic and work across controllers. Isn't the memory controller a better
place for such ops.

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL

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