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res_counter: remove interface for locked charging and uncharging 

The res_counter_{charge,uncharge}_locked() variants are not used in the
kernel outside of the resource counter code itself, so remove the
interface.

Signed-off-by: David Rientjes <rientjes@google.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Jianguo Wu <wujianguo@huawei.com>
Cc: Tim Hockin <thockin@google.com>
Cc: Christoph Lameter <cl@linux.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Rientjes 2014-04-07 15:37:32 -07:00 committed by Linus Torvalds
parent f0432d1596
commit 539a13b47e
3 changed files with 15 additions and 26 deletions
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12
Documentation/cgroups/resource_counter.txt
View File

@ -76,15 +76,7 @@ to work with it.
limit_fail_at parameter is set to the particular res_counter element
where the charging failed.
d. int res_counter_charge_locked
(struct res_counter *rc, unsigned long val, bool force)
The same as res_counter_charge(), but it must not acquire/release the
res_counter->lock internally (it must be called with res_counter->lock
held). The force parameter indicates whether we can bypass the limit.
e. u64 res_counter_uncharge[_locked]
(struct res_counter *rc, unsigned long val)
d. u64 res_counter_uncharge(struct res_counter *rc, unsigned long val)
When a resource is released (freed) it should be de-accounted
from the resource counter it was accounted to. This is called
@ -93,7 +85,7 @@ to work with it.
The _locked routines imply that the res_counter->lock is taken.
f. u64 res_counter_uncharge_until
e. u64 res_counter_uncharge_until
(struct res_counter *rc, struct res_counter *top,
unsigned long val)

6
include/linux/res_counter.h
View File

@ -104,15 +104,13 @@ void res_counter_init(struct res_counter *counter, struct res_counter *parent);
* units, e.g. numbers, bytes, Kbytes, etc
*
* returns 0 on success and <0 if the counter->usage will exceed the
* counter->limit _locked call expects the counter->lock to be taken
* counter->limit
*
* charge_nofail works the same, except that it charges the resource
* counter unconditionally, and returns < 0 if the after the current
* charge we are over limit.
*/
int __must_check res_counter_charge_locked(struct res_counter *counter,
unsigned long val, bool force);
int __must_check res_counter_charge(struct res_counter *counter,
unsigned long val, struct res_counter **limit_fail_at);
int res_counter_charge_nofail(struct res_counter *counter,
@ -125,12 +123,10 @@ int res_counter_charge_nofail(struct res_counter *counter,
* @val: the amount of the resource
*
* these calls check for usage underflow and show a warning on the console
* _locked call expects the counter->lock to be taken
*
* returns the total charges still present in @counter.
*/
u64 res_counter_uncharge_locked(struct res_counter *counter, unsigned long val);
u64 res_counter_uncharge(struct res_counter *counter, unsigned long val);
u64 res_counter_uncharge_until(struct res_counter *counter,

23
kernel/res_counter.c
View File

@ -22,8 +22,18 @@ void res_counter_init(struct res_counter *counter, struct res_counter *parent)
counter->parent = parent;
}
int res_counter_charge_locked(struct res_counter *counter, unsigned long val,
bool force)
static u64 res_counter_uncharge_locked(struct res_counter *counter,
unsigned long val)
{
if (WARN_ON(counter->usage < val))
val = counter->usage;
counter->usage -= val;
return counter->usage;
}
static int res_counter_charge_locked(struct res_counter *counter,
unsigned long val, bool force)
{
int ret = 0;
@ -86,15 +96,6 @@ int res_counter_charge_nofail(struct res_counter *counter, unsigned long val,
return __res_counter_charge(counter, val, limit_fail_at, true);
}
u64 res_counter_uncharge_locked(struct res_counter *counter, unsigned long val)
{
if (WARN_ON(counter->usage < val))
val = counter->usage;
counter->usage -= val;
return counter->usage;
}
u64 res_counter_uncharge_until(struct res_counter *counter,
struct res_counter *top,
unsigned long val)