Scalability requirements for sysv ipc - v2

After scalability problems had been detected when using the sysV ipcs, I
have proposed to use an RCU based implementation of the IDR api instead
(see thread http://lkml.org/lkml/2008/4/11/212).

Resending the patch series after
 . integrating Paul's remarks
 . fixing a bug I had introduced
 . porting it to 2.6.25-mm1.

Reviewers are still welcome!

Patch 1 can be taken alone: it fixes a problem in the existing IDR API.

Patches should be applied on linux-2.6.25-mm1, in the following order:

[ PATCH 01/10 ] : idr_minor_fix.patch
[ PATCH 02/10 ] : ridr_structure.patch
[ PATCH 03/10 ] : ridr_pre_get.patch
[ PATCH 04/10 ] : ridr_init.patch
[ PATCH 05/10 ] : ridr_get_new_above.patch
[ PATCH 06/10 ] : ridr_get_new.patch
[ PATCH 07/10 ] : ridr_find.patch
[ PATCH 08/10 ] : ridr_remove.patch
[ PATCH 09/10 ] : ipc_use_ridr.patch
[ PATCH 10/10 ] : remove_ipc_lock_down.patch

Regards,
Nadia


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