linux-kernel - Re: [PATCH 20/34] mm: move vmscan writes and file write accounting to the node

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Date:	Tue, 12 Jul 2016 11:15:37 -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 20/34] mm: move vmscan writes and file write accounting
 to the node

On Fri, Jul 08, 2016 at 10:34:56AM +0100, Mel Gorman wrote:
> As reclaim is now node-based, it follows that page write activity due to
> page reclaim should also be accounted for on the node.  For consistency,
> also account page writes and page dirtying on a per-node basis.
> 
> After this patch, there are a few remaining zone counters that may appear
> strange but are fine.  NUMA stats are still per-zone as this is a
> user-space interface that tools consume.  NR_MLOCK, NR_SLAB_*,
> NR_PAGETABLE, NR_KERNEL_STACK and NR_BOUNCE are all allocations that
> potentially pin low memory and cannot trivially be reclaimed on demand.
> This information is still useful for debugging a page allocation failure
> warning.
> 
> Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>
> Acked-by: Vlastimil Babka <vbabka@...e.cz>
> Acked-by: Michal Hocko <mhocko@...e.com>

More conversion... ;) FWIW, I didn't spot anything problematic. And
agreed with leaving unmovable stuff counters on a per-zone basis.

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