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SubjectRe: [PATCH 1/6] res_counter: handle limit change
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 <>

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

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