linux-kernel - Re: [PATCH] mm: vmscan: do not throttle based on pfmemalloc reserves if node has no reclaimable zones

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Message-ID: <5515BAF7.6070604@intel.com>
Date:	Fri, 27 Mar 2015 13:17:59 -0700
From:	Dave Hansen <dave.hansen@...el.com>
To:	Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>,
	Mel Gorman <mgorman@...e.de>
CC:	anton@...bar.org, linuxppc-dev@...ts.ozlabs.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>, Rik van Riel <riel@...hat.com>,
	Dan Streetman <ddstreet@...e.org>
Subject: Re: [PATCH] mm: vmscan: do not throttle based on pfmemalloc reserves
 if node has no reclaimable zones

On 03/27/2015 12:28 PM, Nishanth Aravamudan wrote:
> @@ -2585,7 +2585,7 @@ static bool pfmemalloc_watermark_ok(pg_data_t *pgdat)
>  
>         for (i = 0; i <= ZONE_NORMAL; i++) {
>                 zone = &pgdat->node_zones[i];
> -               if (!populated_zone(zone))
> +               if (!populated_zone(zone) || !zone_reclaimable(zone))
>                         continue;
>  
>                 pfmemalloc_reserve += min_wmark_pages(zone);

Do you really want zone_reclaimable()?  Or do you want something more
direct like "zone_reclaimable_pages(zone) == 0"?

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