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| author | Sukadev Bhattiprolu <sukadev@us.ibm.com> | 2007-10-18 23:40:12 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-19 11:53:40 -0700 |
| commit | c9c5d92211883e9ae22394d1f157ab0d3a7ec895 (patch) | |
| tree | bd90ede8e80a59bcb2dfedbc3248e5091736526c /kernel/pid.c | |
| parent | 6f4e643353aea52d80f33960bd88954a7c074f0f (diff) | |
| download | linux-c9c5d92211883e9ae22394d1f157ab0d3a7ec895.tar.bz2 | |
pid namespaces: create a slab-cache for 'struct pid_namespace'
This will help fixing memory leaks due to bad reference counting.
Signed-off-by: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Cc: Paul Menage <menage@google.com>
Cc: "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 'kernel/pid.c')
| -rw-r--r-- | kernel/pid.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/kernel/pid.c b/kernel/pid.c index f76097c60475..d88b83eb703e 100644 --- a/kernel/pid.c +++ b/kernel/pid.c @@ -40,6 +40,7 @@ static struct hlist_head *pid_hash; static int pidhash_shift; struct pid init_struct_pid = INIT_STRUCT_PID; +static struct kmem_cache *pid_ns_cachep; int pid_max = PID_MAX_DEFAULT; @@ -486,7 +487,7 @@ static struct pid_namespace *create_pid_namespace(int level) struct pid_namespace *ns; int i; - ns = kmalloc(sizeof(struct pid_namespace), GFP_KERNEL); + ns = kmem_cache_alloc(pid_ns_cachep, GFP_KERNEL); if (ns == NULL) goto out; @@ -516,7 +517,7 @@ static struct pid_namespace *create_pid_namespace(int level) out_free_map: kfree(ns->pidmap[0].page); out_free: - kfree(ns); + kmem_cache_free(pid_ns_cachep, ns); out: return ERR_PTR(-ENOMEM); } @@ -527,7 +528,7 @@ static void destroy_pid_namespace(struct pid_namespace *ns) for (i = 0; i < PIDMAP_ENTRIES; i++) kfree(ns->pidmap[i].page); - kfree(ns); + kmem_cache_free(pid_ns_cachep, ns); } struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace *old_ns) @@ -601,4 +602,6 @@ void __init pidmap_init(void) init_pid_ns.pid_cachep = create_pid_cachep(1); if (init_pid_ns.pid_cachep == NULL) panic("Can't create pid_1 cachep\n"); + + pid_ns_cachep = KMEM_CACHE(pid_namespace, SLAB_PANIC); } |