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

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Date:	Tue, 14 Aug 2007 14:56:35 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Lee Schermerhorn <Lee.Schermerhorn@...com>
cc:	"Serge E. Hallyn" <serge@...lyn.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>, bob.picco@...com,
	nacc@...ibm.com, kamezawa.hiroyu@...fujitsu.com, mel@...net.ie,
	akpm@...ux-foundation.org, Balbir Singh <balbir@...ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	lkml <linux-kernel@...r.kernel.org>,
	ckrm-tech <ckrm-tech@...ts.sourceforge.net>
Subject: Re: Regression in 2.6.23-rc2-mm2, mounting cpusets causes a hang

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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