Re: Regression in 2.6.23-rc2-mm2, mounting cpusets causes a hang

[Christoph Lameter]

On Tue, 14 Aug 2007, Lee Schermerhorn wrote:

> > Ok then you did not have a NUMA system configured. So its okay for the 
> > dummies to ignore the stuff. CONFIG_NODES_SHIFT is a constant and does not 
> > change. The first bit is always set.
> 
> The first bit [node 0] is only set for the N_ONLINE [and N_POSSIBLE]
> mask.  We could add the static init for the other masks, but since
> non-numa platforms are going through the __build_all_zonelists, they
> might as well set the MEMORY bits explicitly.  Or, maybe you'll
> disagree ;-).

The bitmaps can be completely ignored if !NUMA.

In the non NUMA case we define

static inline int node_state(int node, enum node_states state)
{
        return node == 0;
}

So its always true for node 0. The "bit" is set.

We are trying to get cpusets to work with !NUMA?




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