• Pierre Peiffer's avatar
    IPC: make struct ipc_ids static in ipc_namespace · ed2ddbf8
    Pierre Peiffer authored
    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
    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: default avatarPierre Peiffer <pierre.peiffer@bull.net>
    Acked-by: default avatarCedric Le Goater <clg@fr.ibm.com>
    Cc: Pavel Emelyanov <xemul@openvz.org>
    Cc: Nadia Derbey <Nadia.Derbey@bull.net>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
util.c 21.1 KB