linux-kernel - Re: [PATCH 30/34] mm: page_alloc: cache the last node whose dirty limit is reached

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Message-ID: <20160712184336.GA8629@cmpxchg.org>
Date:	Tue, 12 Jul 2016 14:43:36 -0400
From:	Johannes Weiner <hannes@...xchg.org>
To:	Mel Gorman <mgorman@...hsingularity.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>, Rik van Riel <riel@...riel.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Minchan Kim <minchan@...nel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 30/34] mm: page_alloc: cache the last node whose dirty
 limit is reached

On Fri, Jul 08, 2016 at 10:35:06AM +0100, 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>

I guess...

Acked-by: Johannes Weiner <hannes@...xchg.org>