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authorPierre Peiffer <pierre.peiffer@bull.net>2008-02-08 04:18:57 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-08 09:22:26 -0800
commited2ddbf88c0ddeeae4c78bb306a116dfd867c55c (patch)
treede6d6828c03f98be6fc41e8acf3b3e52df28be9b /ipc/util.c
parent4b9fcb0ec60584d639ad105c42b75a3447071e47 (diff)
downloadlinux-2.6.38-lt-ux500-ed2ddbf88c0ddeeae4c78bb306a116dfd867c55c.tar.gz
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 <pierre.peiffer@bull.net> Acked-by: Cedric Le Goater <clg@fr.ibm.com> Cc: Pavel Emelyanov <xemul@openvz.org> Cc: Nadia Derbey <Nadia.Derbey@bull.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc/util.c')
-rw-r--r--ipc/util.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/ipc/util.c b/ipc/util.c
index 910db774819..fd1b50da9db 100644
--- a/ipc/util.c
+++ b/ipc/util.c
@@ -833,7 +833,7 @@ static void *sysvipc_proc_next(struct seq_file *s, void *it, loff_t *pos)
if (ipc && ipc != SEQ_START_TOKEN)
ipc_unlock(ipc);
- return sysvipc_find_ipc(iter->ns->ids[iface->ids], *pos, pos);
+ return sysvipc_find_ipc(&iter->ns->ids[iface->ids], *pos, pos);
}
/*
@@ -846,7 +846,7 @@ static void *sysvipc_proc_start(struct seq_file *s, loff_t *pos)
struct ipc_proc_iface *iface = iter->iface;
struct ipc_ids *ids;
- ids = iter->ns->ids[iface->ids];
+ ids = &iter->ns->ids[iface->ids];
/*
* Take the lock - this will be released by the corresponding
@@ -877,7 +877,7 @@ static void sysvipc_proc_stop(struct seq_file *s, void *it)
if (ipc && ipc != SEQ_START_TOKEN)
ipc_unlock(ipc);
- ids = iter->ns->ids[iface->ids];
+ ids = &iter->ns->ids[iface->ids];
/* Release the lock we took in start() */
up_read(&ids->rw_mutex);
}