linux-kernel - Re: [PATCH 3/5] mm: Reclaim small amounts of memory when an external fragmentation event occurs

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Message-ID: <20181031165651.GE23537@techsingularity.net>
Date:   Wed, 31 Oct 2018 16:56:52 +0000
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Linux-MM <linux-mm@...ck.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        David Rientjes <rientjes@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Zi Yan <zi.yan@...rutgers.edu>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/5] mm: Reclaim small amounts of memory when an external
 fragmentation event occurs

On Wed, Oct 31, 2018 at 04:06:43PM +0000, Mel Gorman wrote:
> An external fragmentation event was previously described as
> 
>     When the page allocator fragments memory, it records the event using
>     the mm_page_alloc_extfrag event. If the fallback_order is smaller
>     than a pageblock order (order-9 on 64-bit x86) then it's considered
>     an event that will cause external fragmentation issues in the future.
> 

This had a build error reported by the 0-day bot. It's trivially fixed
with

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 77bcc35903e0..e36c279dfade 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3317,8 +3317,8 @@ static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone)
  * probably too small. It only makes sense to spread allocations to avoid
  * fragmentation between the Normal and DMA32 zones.
  */
-static inline unsigned int alloc_flags_nofragment(struct zone *zone,
-							gfp_t gfp_mask)
+static inline unsigned int
+alloc_flags_nofragment(struct zone *zone, gfp_t gfp_mask)
 {
 	if (zone_idx(zone) != ZONE_NORMAL)
 		return 0;
@@ -3340,7 +3340,8 @@ static inline unsigned int alloc_flags_nofragment(struct zone *zone,
 	return ALLOC_NOFRAGMENT;
 }
 #else
-static inline unsigned int alloc_flags_nofragment(struct zone *zone)
+static inline unsigned int
+alloc_flags_nofragment(struct zone *zone, gfp_t gfp_mask)
 {
 	return 0;
 }

-- 
Mel Gorman
SUSE Labs