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

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Message-Id: <1225215134.15763.27.camel@lappy.programming.kicks-ass.net>
Date:	Tue, 28 Oct 2008 18:32:14 +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:

> +	is_subset = cpuset_populate_dirty_limits(dl, &dirtyable_memory,
> +						 &nr_mapped, nodes);
> +	if (!is_subset) {
> +		dl->nr_dirty = global_page_state(NR_FILE_DIRTY);
> +		dl->nr_unstable = global_page_state(NR_UNSTABLE_NFS);
> +		dl->nr_writeback = global_page_state(NR_WRITEBACK);
> +		dirtyable_memory = determine_dirtyable_memory();
> +		nr_mapped = global_page_state(NR_FILE_MAPPED) +
> +			global_page_state(NR_ANON_PAGES);
> +	} else
> +		dirtyable_memory -= highmem_dirtyable_memory(nodes,
> +							dirtyable_memory);

Why not fold that all into cpuset_populate_dirty_limits() ?

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