linux-kernel - Re: [patch -mm] cpusets: add memory_slab

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Message-ID: <6599ad830903080953na692dcfh7f455bfe46a895c3@mail.gmail.com>
Date:	Sun, 8 Mar 2009 09:53:44 -0700
From:	Paul Menage <menage@...gle.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Matt Mackall <mpm@...enic.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch -mm] cpusets: add memory_slab_hardwall flag

On Sun, Mar 8, 2009 at 9:27 AM, David Rientjes <rientjes@...gle.com> wrote:
> +/**
> + * current_cpuset_object_allowed - can a slab object be allocated on a node?
> + * @node: the node for object allocation
> + * @flags: allocation flags
> + *
> + * Return non-zero if object is allowed, zero otherwise.
> + */
> +int current_cpuset_object_allowed(int node, gfp_t flags)
> +{
> +       return !is_slab_hardwall(task_cs(current)) ||
> +              cpuset_node_allowed_hardwall(node, flags);
> +}
> +

This should be in rcu_read_lock()/rcu_read_unlock() in order to safely
dereference the result of task_cs(current)

I'll leave the actual memory allocator changes for others to comment on .

Paul
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