From 98c0d07cbf2a8582a0341b05ad564247e608f6f9 Mon Sep 17 00:00:00 2001 From: Cedric Le Goater Date: Sun, 15 Jul 2007 23:41:07 -0700 Subject: [PATCH] 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 Cc: Herbert Poetzl Cc: Pavel Emelianov Cc: "Eric W. Biederman" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/nsproxy.c | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-) diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c index 15a6015a849..4b7fcc8f9a4 100644 --- a/kernel/nsproxy.c +++ b/kernel/nsproxy.c @@ -21,6 +21,8 @@ #include #include +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); -- 2.41.0