Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=98c0d07cbf2a8582a0341b05ad564247e608f6f9
Commit:     98c0d07cbf2a8582a0341b05ad564247e608f6f9
Parent:     467e9f4b5086a60a5cb2e032ccaf4a31abadc4c2
Author:     Cedric Le Goater <[EMAIL PROTECTED]>
AuthorDate: Sun Jul 15 23:41:07 2007 -0700
Committer:  Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Mon Jul 16 09:05:47 2007 -0700

    add a kmem_cache for nsproxy objects
    
    It should improve performance in some scenarii where a lot of
    these nsproxy objects are created by unsharing namespaces. This is
    a typical use of virtual servers that are being created or entered.
    
    This is also a good tool to find leaks and gather statistics on
    namespace usage.
    
    Signed-off-by: Cedric Le Goater <[EMAIL PROTECTED]>
    Cc: Herbert Poetzl <[EMAIL PROTECTED]>
    Cc: Pavel Emelianov <[EMAIL PROTECTED]>
    Cc: "Eric W. Biederman" <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
 kernel/nsproxy.c |   21 +++++++++++++++++----
 1 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c
index 15a6015..4b7fcc8 100644
--- a/kernel/nsproxy.c
+++ b/kernel/nsproxy.c
@@ -21,6 +21,8 @@
 #include <linux/utsname.h>
 #include <linux/pid_namespace.h>
 
+static struct kmem_cache *nsproxy_cachep;
+
 struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy);
 
 static inline void get_nsproxy(struct nsproxy *ns)
@@ -43,9 +45,11 @@ static inline struct nsproxy *clone_nsproxy(struct nsproxy 
*orig)
 {
        struct nsproxy *ns;
 
-       ns = kmemdup(orig, sizeof(struct nsproxy), GFP_KERNEL);
-       if (ns)
+       ns = kmem_cache_alloc(nsproxy_cachep, GFP_KERNEL);
+       if (ns) {
+               memcpy(ns, orig, sizeof(struct nsproxy));
                atomic_set(&ns->count, 1);
+       }
        return ns;
 }
 
@@ -109,7 +113,7 @@ out_uts:
        if (new_nsp->mnt_ns)
                put_mnt_ns(new_nsp->mnt_ns);
 out_ns:
-       kfree(new_nsp);
+       kmem_cache_free(nsproxy_cachep, new_nsp);
        return ERR_PTR(err);
 }
 
@@ -160,7 +164,7 @@ void free_nsproxy(struct nsproxy *ns)
                put_pid_ns(ns->pid_ns);
        if (ns->user_ns)
                put_user_ns(ns->user_ns);
-       kfree(ns);
+       kmem_cache_free(nsproxy_cachep, ns);
 }
 
 /*
@@ -185,3 +189,12 @@ int unshare_nsproxy_namespaces(unsigned long unshare_flags,
                err = PTR_ERR(*new_nsp);
        return err;
 }
+
+static int __init nsproxy_cache_init(void)
+{
+       nsproxy_cachep = kmem_cache_create("nsproxy", sizeof(struct nsproxy),
+                                          0, SLAB_PANIC, NULL, NULL);
+       return 0;
+}
+
+module_init(nsproxy_cache_init);
-
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