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| author | Paul Mackerras <paulus@samba.org> | 2009-04-22 05:02:09 +0200 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2009-04-22 05:02:09 +0200 |
| commit | 5bd3ef84d73c2ea7b4babbad060909753c4828d4 (patch) | |
| tree | fdf2bafb48ae1ed03175f6c77a7548a181e69ee9 /Documentation/cgroups/resource_counter.txt | |
| parent | powerpc/85xx: Remove defconfigs that mpc85xx_{smp_}defconfig cover (diff) | |
| parent | powerpc: Fix of_node_put() exit path in of_irq_map_one() (diff) | |
| download | linux-5bd3ef84d73c2ea7b4babbad060909753c4828d4.tar.xz linux-5bd3ef84d73c2ea7b4babbad060909753c4828d4.zip | |
Merge branch 'merge' of git://git.secretlab.ca/git/linux-2.6 into merge
Diffstat (limited to 'Documentation/cgroups/resource_counter.txt')
| -rw-r--r-- | Documentation/cgroups/resource_counter.txt | 27 |
1 files changed, 21 insertions, 6 deletions
diff --git a/Documentation/cgroups/resource_counter.txt b/Documentation/cgroups/resource_counter.txt index f196ac1d7d25..95b24d766eab 100644 --- a/Documentation/cgroups/resource_counter.txt +++ b/Documentation/cgroups/resource_counter.txt @@ -47,13 +47,18 @@ to work with it. 2. Basic accounting routines - a. void res_counter_init(struct res_counter *rc) + a. void res_counter_init(struct res_counter *rc, + struct res_counter *rc_parent) Initializes the resource counter. As usual, should be the first routine called for a new counter. - b. int res_counter_charge[_locked] - (struct res_counter *rc, unsigned long val) + The struct res_counter *parent can be used to define a hierarchical + child -> parent relationship directly in the res_counter structure, + NULL can be used to define no relationship. + + c. int res_counter_charge(struct res_counter *rc, unsigned long val, + struct res_counter **limit_fail_at) When a resource is about to be allocated it has to be accounted with the appropriate resource counter (controller should determine @@ -67,15 +72,25 @@ to work with it. * if the charging is performed first, then it should be uncharged on error path (if the one is called). - c. void res_counter_uncharge[_locked] + If the charging fails and a hierarchical dependency exists, the + 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) + + 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). + + e. void res_counter_uncharge[_locked] (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 "uncharging". - The _locked routines imply that the res_counter->lock is taken. - + The _locked routines imply that the res_counter->lock is taken. 2.1 Other accounting routines |