Messages in this thread | | | Date | Mon, 23 Jun 2008 15:40:43 -0700 | From | Randy Dunlap <> | Subject | Re: [PATCH 1/6] res_counter: handle limit change |
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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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