diff options
author | Nicolas Dichtel <nicolas.dichtel@6wind.com> | 2014-12-10 15:45:01 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-12-10 17:41:09 -0800 |
commit | 710585d4922fd315f2cada8fbe550ae8ed23e994 (patch) | |
tree | dd783ed159fcf3be1463c41637b12345d60cd1de /fs/proc/proc_net.c | |
parent | 9edad6ea0f1416415f6fe31cc9d1dbc3817803ed (diff) | |
download | linux-710585d4922fd315f2cada8fbe550ae8ed23e994.tar.bz2 |
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/proc_net.c')
-rw-r--r-- | fs/proc/proc_net.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/proc/proc_net.c b/fs/proc/proc_net.c index a63af3e0a612..1bde894bc624 100644 --- a/fs/proc/proc_net.c +++ b/fs/proc/proc_net.c @@ -192,6 +192,7 @@ static __net_init int proc_net_ns_init(struct net *net) if (!netd) goto out; + netd->subdir = RB_ROOT; netd->data = net; netd->nlink = 2; netd->namelen = 3; |