linux-kernel - Re: [patch 3/7] mm: make page writeback obey cpuset constraints

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Date:	Tue, 28 Oct 2008 18:31:33 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>, Paul Menage <menage@...gle.com>,
	Derek Fults <dfults@....com>, linux-kernel@...r.kernel.org
Subject: Re: [patch 3/7] mm: make page writeback obey cpuset constraints

On Tue, 2008-10-28 at 09:08 -0700, David Rientjes wrote:

> +/*
> + * Calculate the limits relative to the current cpuset
> + *
> + * We do not disregard highmem because all nodes (except maybe node 0) have
> + * either all memory in HIGHMEM (32-bit) or all memory in non-HIGHMEM (64-bit).
> + * If we would disregard highmem, then cpuset throttling would not work on
> + * 32-bit.
> + */
> +int cpuset_populate_dirty_limits(struct dirty_limits *dl,
> +				 unsigned long *dirtyable_memory,
> +				 unsigned long *nr_mapped,
> +				 const nodemask_t *nodes)
> +{
> +	int node;
> +
> +	if (likely(!nodes || nodes_subset(node_online_map, *nodes)))
> +		return 0;
> +	for_each_node_mask(node, *nodes) {
> +		if (!node_online(node))
> +			continue;
> +		dl->nr_dirty += node_page_state(node, NR_FILE_DIRTY);
> +		dl->nr_unstable += node_page_state(node, NR_UNSTABLE_NFS);
> +		dl->nr_writeback += node_page_state(node, NR_WRITEBACK);
> +		dirtyable_memory +=

*dirtyable_memory perhaps?

> +			node_page_state(node, NR_ACTIVE_ANON) +
> +			node_page_state(node, NR_ACTIVE_FILE) +
> +			node_page_state(node, NR_INACTIVE_ANON) +
> +			node_page_state(node, NR_INACTIVE_FILE) +
> +			node_page_state(node, NR_FREE_PAGES);
> +		nr_mapped +=

idem?

> +			node_page_state(node, NR_FILE_MAPPED) +
> +			node_page_state(node, NR_ANON_PAGES);
> +	}
> +	return 1;
> +}



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