linux-kernel - Re: [PATCH 25/27] mm: page_alloc: Cache the last node whose dirty limit is reached

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Message-ID: <654783c8-ffcb-af3f-90be-d6bd62e554e1@suse.cz>
Date:	Fri, 17 Jun 2016 13:31:06 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Mel Gorman <mgorman@...hsingularity.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>
Cc:	Rik van Riel <riel@...riel.com>,
	Johannes Weiner <hannes@...xchg.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 25/27] mm: page_alloc: Cache the last node whose dirty
 limit is reached

On 06/09/2016 08:04 PM, Mel Gorman wrote:
> If a page is about to be dirtied then the page allocator attempts to limit
> the total number of dirty pages that exists in any given zone. The call
> to node_dirty_ok is expensive so this patch records if the last pgdat
> examined hit the dirty limits. In some cases, this reduces the number
> of calls to node_dirty_ok().
>
> Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>

Acked-by: Vlastimil Babka <vbabka@...e.cz>