The patch titled
add a kmem_cache for nsproxy objects
has been added to the -mm tree. Its filename is
add-a-kmem_cache-for-nsproxy-objects.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: add a kmem_cache for nsproxy objects
From: Cedric Le Goater <clg@xxxxxxxxxx>
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 <clg@xxxxxxxxxx>
Cc: Herbert Poetzl <herbert@xxxxxxxxxxxx>
Cc: Pavel Emelianov <xemul@xxxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/nsproxy.c | 21 +++++++++++++++++----
1 files changed, 17 insertions(+), 4 deletions(-)
diff -puN kernel/nsproxy.c~add-a-kmem_cache-for-nsproxy-objects kernel/nsproxy.c
--- a/kernel/nsproxy.c~add-a-kmem_cache-for-nsproxy-objects
+++ a/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_nspr
{
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
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);
_
Patches currently in -mm which might be from clg@xxxxxxxxxx are
fix-refcounting-of-nsproxy-object-when-unshared.patch
mm-merge-nopfn-into-fault-spufs-fix.patch
remove-config_uts_ns-and-config_ipc_ns.patch
user-namespace-add-the-framework.patch
user-namespace-add-unshare.patch
mm-fix-create_new_namespaces-return-value.patch
add-a-kmem_cache-for-nsproxy-objects.patch
containersv10-add-tasks-file-interface-fix-2.patch
-
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