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5fbf8563
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5fbf8563
编写于
11月 16, 2010
作者:
J
Jens Axboe
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Merge branch 'for-2.6.38/rc2-holder' into for-2.6.38/core
上级
a0205634
bdc85df7
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2
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2 changed file
with
27 addition
and
4 deletion
+27
-4
Documentation/cgroups/blkio-controller.txt
Documentation/cgroups/blkio-controller.txt
+27
-0
block/blk-cgroup.c
block/blk-cgroup.c
+0
-4
未找到文件。
Documentation/cgroups/blkio-controller.txt
浏览文件 @
5fbf8563
...
...
@@ -89,6 +89,33 @@ Throttling/Upper Limit policy
Limits for writes can be put using blkio.write_bps_device file.
Hierarchical Cgroups
====================
- Currently none of the IO control policy supports hierarhical groups. But
cgroup interface does allow creation of hierarhical cgroups and internally
IO policies treat them as flat hierarchy.
So this patch will allow creation of cgroup hierarhcy but at the backend
everything will be treated as flat. So if somebody created a hierarchy like
as follows.
root
/ \
test1 test2
|
test3
CFQ and throttling will practically treat all groups at same level.
pivot
/ | \ \
root test1 test2 test3
Down the line we can implement hierarchical accounting/control support
and also introduce a new cgroup file "use_hierarchy" which will control
whether cgroup hierarchy is viewed as flat or hierarchical by the policy..
This is how memory controller also has implemented the things.
Various user visible config options
===================================
CONFIG_BLK_CGROUP
...
...
block/blk-cgroup.c
浏览文件 @
5fbf8563
...
...
@@ -1452,10 +1452,6 @@ blkiocg_create(struct cgroup_subsys *subsys, struct cgroup *cgroup)
goto
done
;
}
/* Currently we do not support hierarchy deeper than two level (0,1) */
if
(
parent
!=
cgroup
->
top_cgroup
)
return
ERR_PTR
(
-
EPERM
);
blkcg
=
kzalloc
(
sizeof
(
*
blkcg
),
GFP_KERNEL
);
if
(
!
blkcg
)
return
ERR_PTR
(
-
ENOMEM
);
...
...
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