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cgroups: remove the css_set linked-list 

Now we can run through the hash table instead of running through the
linked-list.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Reviewed-by: Paul Menage <menage@google.com>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Li Zefan 2008-04-29 01:00:13 -07:00 committed by Linus Torvalds
parent e8d55fdeb8
commit 28fd5dfc12
2 changed files with 20 additions and 26 deletions
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6
include/linux/cgroup.h
View File

@ -149,12 +149,6 @@ struct css_set {
/* Reference count */
struct kref ref;
/*
* List running through all cgroup groups. Protected by
* css_set_lock
*/
struct list_head list;
/*
* List running through all cgroup groups in the same hash
* slot. Protected by css_set_lock

40
kernel/cgroup.c
View File

@ -242,7 +242,6 @@ static void unlink_css_set(struct css_set *cg)
{
write_lock(&css_set_lock);
hlist_del(&cg->hlist);
list_del(&cg->list);
css_set_count--;
while (!list_empty(&cg->cg_links)) {
struct cg_cgroup_link *link;
@ -477,8 +476,6 @@ static struct css_set *find_css_set(
BUG_ON(!list_empty(&tmp_cg_links));
/* Link this cgroup group into the list */
list_add(&res->list, &init_css_set.list);
css_set_count++;
/* Add this cgroup group to the hash table */
@ -963,7 +960,7 @@ static int cgroup_get_sb(struct file_system_type *fs_type,
int ret = 0;
struct super_block *sb;
struct cgroupfs_root *root;
struct list_head tmp_cg_links, *l;
struct list_head tmp_cg_links;
INIT_LIST_HEAD(&tmp_cg_links);
/* First find the desired set of subsystems */
@ -1005,6 +1002,7 @@ static int cgroup_get_sb(struct file_system_type *fs_type,
/* New superblock */
struct cgroup *cgrp = &root->top_cgroup;
struct inode *inode;
int i;
BUG_ON(sb->s_root != NULL);
@ -1049,22 +1047,25 @@ static int cgroup_get_sb(struct file_system_type *fs_type,
/* Link the top cgroup in this hierarchy into all
* the css_set objects */
write_lock(&css_set_lock);
l = &init_css_set.list;
do {
for (i = 0; i < CSS_SET_TABLE_SIZE; i++) {
struct hlist_head *hhead = &css_set_table[i];
struct hlist_node *node;
struct css_set *cg;
struct cg_cgroup_link *link;
cg = list_entry(l, struct css_set, list);
BUG_ON(list_empty(&tmp_cg_links));
link = list_entry(tmp_cg_links.next,
struct cg_cgroup_link,
cgrp_link_list);
list_del(&link->cgrp_link_list);
link->cg = cg;
list_add(&link->cgrp_link_list,
&root->top_cgroup.css_sets);
list_add(&link->cg_link_list, &cg->cg_links);
l = l->next;
} while (l != &init_css_set.list);
hlist_for_each_entry(cg, node, hhead, hlist) {
struct cg_cgroup_link *link;
BUG_ON(list_empty(&tmp_cg_links));
link = list_entry(tmp_cg_links.next,
struct cg_cgroup_link,
cgrp_link_list);
list_del(&link->cgrp_link_list);
link->cg = cg;
list_add(&link->cgrp_link_list,
&root->top_cgroup.css_sets);
list_add(&link->cg_link_list, &cg->cg_links);
}
}
write_unlock(&css_set_lock);
free_cg_links(&tmp_cg_links);
@ -2514,7 +2515,6 @@ int __init cgroup_init_early(void)
int i;
kref_init(&init_css_set.ref);
kref_get(&init_css_set.ref);
INIT_LIST_HEAD(&init_css_set.list);
INIT_LIST_HEAD(&init_css_set.cg_links);
INIT_LIST_HEAD(&init_css_set.tasks);
INIT_HLIST_NODE(&init_css_set.hlist);