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SubjectRe: [PATCH 1/6] res_counter: handle limit change
On Fri, 13 Jun 2008 18:29:24 +0900 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>
>
> ---
> Documentation/controllers/resource_counter.txt | 19 +++++-
> include/linux/res_counter.h | 33 ++++++++++-
> kernel/res_counter.c | 74 ++++++++++++++++++++++++-
> 3 files changed, 121 insertions(+), 5 deletions(-)
>
> Index: linux-2.6.26-rc5-mm3/Documentation/controllers/resource_counter.txt
> ===================================================================
> --- linux-2.6.26-rc5-mm3.orig/Documentation/controllers/resource_counter.txt
> +++ linux-2.6.26-rc5-mm3/Documentation/controllers/resource_counter.txt
> @@ -141,8 +145,19 @@ counter fields. They are recommended to
> failcnt reset to zero
>
>
> +5. res_counter_ops (Callbacks)
>
> -5. Usage example
> + res_counter_ops is for implementing feedback control from res_counter
> + to subsystem. Each one has each own purpose and the subsystem doesn't

isn't

> + necessary to provide all callbacks. Just implement necessary ones.

required

> +
> + - shrink_usage(res_counter, newlimit, retry)
> + Called for reducing usage to newlimit, retry is incremented per
> + loop. (See memory resource controller as example.)
> + Returns 0 at success. Any error code is acceptable but -EBUSY will be
> + suitable to show "the kernel can't shrink usage."
> +
> +6. Usage example
>
> a. Declare a task group (take a look at cgroups subsystem for this) and
> fold a res_counter into it


---
~Randy
Linux Plumbers Conference, 17-19 September 2008, Portland, Oregon USA
http://linuxplumbersconf.org/


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