• Nadia Derbey's avatar
    ipc: recompute msgmni on memory add / remove · b6b337ad
    Nadia Derbey authored
    Introduce the registration of a callback routine that recomputes msg_ctlmni
    upon memory add / remove.
    
    A single notifier block is registered in the hotplug memory chain for all the
    ipc namespaces.
    
    Since the ipc namespaces are not linked together, they have their own
    notification chain: one notifier_block is defined per ipc namespace.
    
    Each time an ipc namespace is created (removed) it registers (unregisters) its
    notifier block in (from) the ipcns chain.  The callback routine registered in
    the memory chain invokes the ipcns notifier chain with the IPCNS_LOWMEM event.
     Each callback routine registered in the ipcns namespace, in turn, recomputes
    msgmni for the owning namespace.
    Signed-off-by: 's avatarNadia Derbey <Nadia.Derbey@bull.net>
    Cc: Yasunori Goto <y-goto@jp.fujitsu.com>
    Cc: Matt Helsley <matthltc@us.ibm.com>
    Cc: Mingming Cao <cmm@us.ibm.com>
    Cc: Pierre Peiffer <pierre.peiffer@bull.net>
    Signed-off-by: 's avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: 's avatarLinus Torvalds <torvalds@linux-foundation.org>
    b6b337ad
Makefile 384 Bytes