linux-kernel - Re: [PATCH 010 of 11] knfsd: make rpc threads pools numa aware

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Message-Id: <20060730211454.ccf803f3.akpm@osdl.org>
Date:	Sun, 30 Jul 2006 21:14:54 -0700
From:	Andrew Morton <akpm@...l.org>
To:	NeilBrown <neilb@...e.de>
Cc:	nfs@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 010 of 11] knfsd: make rpc threads pools numa aware

On Mon, 31 Jul 2006 10:42:34 +1000
NeilBrown <neilb@...e.de> wrote:

> +static int
> +svc_pool_map_init_percpu(struct svc_pool_map *m)
> +{
> +	unsigned int maxpools = num_possible_cpus();
> +	unsigned int pidx = 0;
> +	unsigned int cpu;
> +	int err;
> +
> +	err = svc_pool_map_alloc_arrays(m, maxpools);
> +	if (err)
> +		return err;
> +
> +	for_each_online_cpu(cpu) {
> +		BUG_ON(pidx > maxpools);
> +		m->to_pool[cpu] = pidx;
> +		m->pool_to[pidx] = cpu;
> +		pidx++;
> +	}

That isn't right - it assumes that cpu_possible_map is not sparse.  If it
is sparse, we allocate undersized pools and then overindex them.
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