Siddha, Suresh B a écrit :
On Thu, Mar 22, 2007 at 11:12:39PM +0100, Eric Dumazet wrote:
Siddha, Suresh B a écrit :
+ if (num_online_nodes() == 1)
+ use_alien_caches = 0;
+
Unfortunatly this part is wrong.
oops.
You should check num_possible_nodes(), or nr_node_ids (this one is cheaper,
its a variable instead of a function call)
But that is based on compile time option, isn't it? Perhaps I need
to use some other mechanism to find out the platform is not NUMA capable..
nr_node_ids is defined to 1 if you compile a non NUMA kernel.
If CONFIG_NUMA is on, then nr_node_ids is a variable, that is filled with the
maximum nodeid of possible node (+1). If your machine is not CPU hot plug
capable, and you have say one node, (one dual core processor for example),
then nr_node_ids will be set to 1
(see mm/page_alloc.c function setup_nr_node_ids() )
So this is OK for your need...
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