kernel-ark/ipc
Pierre Peiffer ed2ddbf88c 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>
2008-02-08 09:22:26 -08:00
..
compat_mq.c
compat.c fix logic error in ipc compat semctl() 2007-07-06 10:23:43 -07:00
ipc_sysctl.c namespaces: move the IPC namespace under IPC_NS option 2008-02-08 09:22:23 -08:00
Makefile namespaces: move the IPC namespace under IPC_NS option 2008-02-08 09:22:23 -08:00
mqueue.c ipc: lost unlock and fput in mqueue.c on error path 2007-11-29 09:24:52 -08:00
msg.c IPC: make struct ipc_ids static in ipc_namespace 2008-02-08 09:22:26 -08:00
msgutil.c [PATCH] getting rid of all casts of k[cmz]alloc() calls 2006-12-13 09:05:58 -08:00
namespace.c IPC: make struct ipc_ids static in ipc_namespace 2008-02-08 09:22:26 -08:00
sem.c IPC: make struct ipc_ids static in ipc_namespace 2008-02-08 09:22:26 -08:00
shm.c IPC: make struct ipc_ids static in ipc_namespace 2008-02-08 09:22:26 -08:00
util.c IPC: make struct ipc_ids static in ipc_namespace 2008-02-08 09:22:26 -08:00
util.h IPC: make struct ipc_ids static in ipc_namespace 2008-02-08 09:22:26 -08:00