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mm, compaction: rearrange compact_control

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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.

Link: http://lkml.kernel.org/r/20190118175136.31341-3-mgorman@techsingularity.net
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: David Rientjes <rientjes@google.com>
Cc: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mel Gorman 2019-03-05 15:44:28 -08:00 • committed by Linus Torvalds
parent c5fbd937b6
commit c5943b9c53
1 changed files with 3 additions and 3 deletions
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6
mm/internal.h
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@ -184,14 +184,14 @@ extern int user_min_free_kbytes;
struct compact_control { struct compact_control {
struct list_head freepages; /* List of free pages to migrate to */ struct list_head freepages; /* List of free pages to migrate to */
struct list_head migratepages; /* List of pages being migrated */ struct list_head migratepages; /* List of pages being migrated */
struct zone *zone;
unsigned int nr_freepages; /* Number of isolated free pages */ unsigned int nr_freepages; /* Number of isolated free pages */
unsigned int nr_migratepages; /* Number of pages to migrate */ 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 free_pfn; /* isolate_freepages search base */
unsigned long migrate_pfn; /* isolate_migratepages search base */ unsigned long migrate_pfn; /* isolate_migratepages search base */
unsigned long last_migrated_pfn;/* Not yet flushed page being freed */ 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 */ const gfp_t gfp_mask; /* gfp mask of a direct compactor */
int order; /* order a direct compactor needs */ int order; /* order a direct compactor needs */
int migratetype; /* migratetype of direct compactor */ int migratetype; /* migratetype of direct compactor */