From ed2ddbf88c0ddeeae4c78bb306a116dfd867c55c Mon Sep 17 00:00:00 2001 From: Pierre Peiffer Date: Fri, 8 Feb 2008 04:18:57 -0800 Subject: IPC: make struct ipc_ids static in ipc_namespace Each ipc_namespace contains a table of 3 pointers to struct ipc_ids (3 for msg, sem and shm, structure used to store all ipcs) These 'struct ipc_ids' are dynamically allocated for each icp_namespace as the ipc_namespace itself (for the init namespace, they are initialized with pointers to static variables instead) It is so for historical reason: in fact, before the use of idr to store the ipcs, the ipcs were stored in tables of variable length, depending of the maximum number of ipc allowed. Now, these 'struct ipc_ids' have a fixed size. As they are allocated in any cases for each new ipc_namespace, there is no gain of memory in having them allocated separately of the struct ipc_namespace. This patch proposes to make this table static in the struct ipc_namespace. Thus, we can allocate all in once and get rid of all the code needed to allocate and free these ipc_ids separately. Signed-off-by: Pierre Peiffer Acked-by: Cedric Le Goater Cc: Pavel Emelyanov Cc: Nadia Derbey Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- ipc/sem.c | 26 ++++---------------------- 1 file changed, 4 insertions(+), 22 deletions(-) (limited to 'ipc/sem.c') diff --git a/ipc/sem.c b/ipc/sem.c index 7836edb0cf9..1f7e28d1d25 100644 --- a/ipc/sem.c +++ b/ipc/sem.c @@ -87,14 +87,12 @@ #include #include "util.h" -#define sem_ids(ns) (*((ns)->ids[IPC_SEM_IDS])) +#define sem_ids(ns) ((ns)->ids[IPC_SEM_IDS]) #define sem_unlock(sma) ipc_unlock(&(sma)->sem_perm) #define sem_checkid(sma, semid) ipc_checkid(&sma->sem_perm, semid) #define sem_buildid(id, seq) ipc_buildid(id, seq) -static struct ipc_ids init_sem_ids; - static int newary(struct ipc_namespace *, struct ipc_params *); static void freeary(struct ipc_namespace *, struct sem_array *); #ifdef CONFIG_PROC_FS @@ -118,30 +116,17 @@ static int sysvipc_sem_proc_show(struct seq_file *s, void *it); #define sc_semopm sem_ctls[2] #define sc_semmni sem_ctls[3] -static void __sem_init_ns(struct ipc_namespace *ns, struct ipc_ids *ids) +void sem_init_ns(struct ipc_namespace *ns) { - ns->ids[IPC_SEM_IDS] = ids; ns->sc_semmsl = SEMMSL; ns->sc_semmns = SEMMNS; ns->sc_semopm = SEMOPM; ns->sc_semmni = SEMMNI; ns->used_sems = 0; - ipc_init_ids(ids); + ipc_init_ids(&ns->ids[IPC_SEM_IDS]); } #ifdef CONFIG_IPC_NS -int sem_init_ns(struct ipc_namespace *ns) -{ - struct ipc_ids *ids; - - ids = kmalloc(sizeof(struct ipc_ids), GFP_KERNEL); - if (ids == NULL) - return -ENOMEM; - - __sem_init_ns(ns, ids); - return 0; -} - void sem_exit_ns(struct ipc_namespace *ns) { struct sem_array *sma; @@ -163,15 +148,12 @@ void sem_exit_ns(struct ipc_namespace *ns) total++; } up_write(&sem_ids(ns).rw_mutex); - - kfree(ns->ids[IPC_SEM_IDS]); - ns->ids[IPC_SEM_IDS] = NULL; } #endif void __init sem_init (void) { - __sem_init_ns(&init_ipc_ns, &init_sem_ids); + sem_init_ns(&init_ipc_ns); ipc_init_proc_interface("sysvipc/sem", " key semid perms nsems uid gid cuid cgid otime ctime\n", IPC_SEM_IDS, sysvipc_sem_proc_show); -- cgit v1.2.3