Re: pool_cache_invalidate(9) (wrong?) semantic -- enable xcall invalidation

[Thor Lancelot Simon <tls%panix.com@localhost>]

On Wed, Nov 09, 2011 at 01:51:23AM +0100, Jean-Yves Migeon wrote:
> 
> 1 # adding an "invalidate flag" to the pool cache, for each CPU.

How about a serial number, instead.  Locally in each CPU's pool cache,
globally for the entire kernel.  pool_cache_invalidate increments the
serial number with an atomic operation; before each allocation on any
CPU, that CPU checks whether its local serial number matches the global
one.  If not, invalidate, then retry the operation.  Repeat as necessary.

Thor