linux-kernel - [PATCH 02/14] mm, compaction: Rearrange compact

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Message-Id: <20181214230310.572-3-mgorman@techsingularity.net>
Date:   Fri, 14 Dec 2018 23:02:58 +0000
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Linux-MM <linux-mm@...ck.org>
Cc:     David Rientjes <rientjes@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Michal Hocko <mhocko@...nel.org>, ying.huang@...el.com,
        kirill@...temov.name, Andrew Morton <akpm@...ux-foundation.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Mel Gorman <mgorman@...hsingularity.net>
Subject: [PATCH 02/14] mm, compaction: Rearrange compact_control

compact_control spans two cache lines with write-intensive lines on
both. Rearrange so the most write-intensive fields are in the same
cache line. This has a negligible impact on the overall performance of
compaction and is more a tidying exercise than anything.

Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>
---
 mm/internal.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/internal.h b/mm/internal.h
index 5564841fce36..867af5425432 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -184,14 +184,14 @@ extern int user_min_free_kbytes;
 struct compact_control {
 	struct list_head freepages;	/* List of free pages to migrate to */
 	struct list_head migratepages;	/* List of pages being migrated */
-	struct zone *zone;
 	unsigned int nr_freepages;	/* Number of isolated free pages */
 	unsigned int nr_migratepages;	/* Number of pages to migrate */
-	unsigned long total_migrate_scanned;
-	unsigned long total_free_scanned;
 	unsigned long free_pfn;		/* isolate_freepages search base */
 	unsigned long migrate_pfn;	/* isolate_migratepages search base */
 	unsigned long last_migrated_pfn;/* Not yet flushed page being freed */
+	struct zone *zone;
+	unsigned long total_migrate_scanned;
+	unsigned long total_free_scanned;
 	const gfp_t gfp_mask;		/* gfp mask of a direct compactor */
 	int order;			/* order a direct compactor needs */
 	int migratetype;		/* migratetype of direct compactor */
-- 
2.16.4