summaryrefslogtreecommitdiff
path: root/fs/proc/root.c
diff options
context:
space:
mode:
authorNicolas Dichtel <nicolas.dichtel@6wind.com>2014-12-10 15:45:01 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-12-10 17:41:09 -0800
commit710585d4922fd315f2cada8fbe550ae8ed23e994 (patch)
treedd783ed159fcf3be1463c41637b12345d60cd1de /fs/proc/root.c
parent9edad6ea0f1416415f6fe31cc9d1dbc3817803ed (diff)
fs/proc: use a rb tree for the directory entries
When a lot of netdevices are created, one of the bottleneck is the creation of proc entries. This serie aims to accelerate this part. The current implementation for the directories in /proc is using a single linked list. This is slow when handling directories with large numbers of entries (eg netdevice-related entries when lots of tunnels are opened). This patch replaces this linked list by a red-black tree. Here are some numbers: dummy30000.batch contains 30 000 times 'link add type dummy'. Before the patch: $ time ip -b dummy30000.batch real 2m31.950s user 0m0.440s sys 2m21.440s $ time rmmod dummy real 1m35.764s user 0m0.000s sys 1m24.088s After the patch: $ time ip -b dummy30000.batch real 2m0.874s user 0m0.448s sys 1m49.720s $ time rmmod dummy real 1m13.988s user 0m0.000s sys 1m1.008s The idea of improving this part was suggested by Thierry Herbelot. [akpm@linux-foundation.org: initialise proc_root.subdir at compile time] Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Acked-by: David S. Miller <davem@davemloft.net> Cc: Thierry Herbelot <thierry.herbelot@6wind.com>. Acked-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/proc/root.c')
-rw-r--r--fs/proc/root.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/proc/root.c b/fs/proc/root.c
index 094e44d4a6be..e74ac9f1a2c0 100644
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -251,6 +251,7 @@ struct proc_dir_entry proc_root = {
.proc_iops = &proc_root_inode_operations,
.proc_fops = &proc_root_operations,
.parent = &proc_root,
+ .subdir = RB_ROOT,
.name = "/proc",
};