diff options
| author | Li Zefan <lizf@cn.fujitsu.com> | 2008-04-29 01:00:11 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-29 08:06:09 -0700 |
| commit | 472b1053f3c319cc60bfb2a0bb062fed77a93eb6 (patch) | |
| tree | 2ef88bfdb7e397d3718a1bed38f13194f894097e /include | |
| parent | 08ce5f16ee466ffc5bf243800deeecd77d9eaf50 (diff) | |
cgroups: use a hash table for css_set finding
When we attach a process to a different cgroup, the css_set linked-list will
be run through to find a suitable existing css_set to use. This patch
implements a hash table for better performance.
The following benchmarks have been tested:
For N in 1, 5, 10, 50, 100, 500, 1000, create N cgroups with one sleeping
task in each, and then move an additional task through each cgroup in
turn.
Here is a test result:
N Loop orig - Time(s) hash - Time(s)
----------------------------------------------
1 10000 1.201231728 1.196311177
5 2000 1.065743872 1.040566424
10 1000 0.991054735 0.986876440
50 200 0.976554203 0.969608733
100 100 0.998504680 0.969218270
500 20 1.157347764 0.962602963
1000 10 1.619521852 1.085140172
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/cgroup.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index 2d1d151258cf..f585b7cde87b 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -156,6 +156,12 @@ struct css_set { struct list_head list; /* + * List running through all cgroup groups in the same hash + * slot. Protected by css_set_lock + */ + struct hlist_node hlist; + + /* * List running through all tasks using this cgroup * group. Protected by css_set_lock */ @@ -174,7 +180,6 @@ struct css_set { * during subsystem registration (at boot time). */ struct cgroup_subsys_state *subsys[CGROUP_SUBSYS_COUNT]; - }; /* |