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author | Pierre Peiffer <pierre.peiffer@bull.net> | 2008-02-08 04:18:57 -0800 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-08 09:22:26 -0800 |
commit | ed2ddbf88c0ddeeae4c78bb306a116dfd867c55c (patch) | |
tree | de6d6828c03f98be6fc41e8acf3b3e52df28be9b /include | |
parent | 4b9fcb0ec60584d639ad105c42b75a3447071e47 (diff) | |
download | linux-3.10-ed2ddbf88c0ddeeae4c78bb306a116dfd867c55c.tar.gz linux-3.10-ed2ddbf88c0ddeeae4c78bb306a116dfd867c55c.tar.bz2 linux-3.10-ed2ddbf88c0ddeeae4c78bb306a116dfd867c55c.zip |
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 'include')
-rw-r--r-- | include/linux/ipc_namespace.h | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/include/linux/ipc_namespace.h b/include/linux/ipc_namespace.h index a491fc9dd23..6db5522eef5 100644 --- a/include/linux/ipc_namespace.h +++ b/include/linux/ipc_namespace.h @@ -2,11 +2,20 @@ #define __IPC_NAMESPACE_H__ #include <linux/err.h> +#include <linux/idr.h> +#include <linux/rwsem.h> + +struct ipc_ids { + int in_use; + unsigned short seq; + unsigned short seq_max; + struct rw_semaphore rw_mutex; + struct idr ipcs_idr; +}; -struct ipc_ids; struct ipc_namespace { struct kref kref; - struct ipc_ids *ids[3]; + struct ipc_ids ids[3]; int sem_ctls[4]; int used_sems; |