From: David Rientjes <rient...@google.com>
commit da1c67a76f7cf2b3404823d24f9f10fa91aa5dc5 upstream.
The conditions that control the isolation mode in
isolate_migratepages_range() do not change during the iteration, so
extract them out and only define the value once.
This actually does have an effect, gcc doesn't optimize it itself because
of cc->sync.
Signed-off-by: David Rientjes <rient...@google.com>
Cc: Mel Gorman <mgor...@suse.de>
Acked-by: Rik van Riel <r...@redhat.com>
Acked-by: Vlastimil Babka <vba...@suse.cz>
Cc: Joonsoo Kim <iamjoonsoo....@lge.com>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Mel Gorman <mgor...@suse.de>
---
mm/compaction.c | 9 ++-------
1 file changed, 2 insertions(+), 7 deletions(-)
diff --git a/mm/compaction.c b/mm/compaction.c
index 10f9f8c..4530818 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -461,12 +461,13 @@ isolate_migratepages_range(struct zone *zone, struct
compact_control *cc,
unsigned long last_pageblock_nr = 0, pageblock_nr;
unsigned long nr_scanned = 0, nr_isolated = 0;
struct list_head *migratelist = &cc->migratepages;
- isolate_mode_t mode = 0;
struct lruvec *lruvec;
unsigned long flags;
bool locked = false;
struct page *page = NULL, *valid_page = NULL;
bool skipped_async_unsuitable = false;
+ const isolate_mode_t mode = (!cc->sync ? ISOLATE_ASYNC_MIGRATE : 0) |
+ (unevictable ? ISOLATE_UNEVICTABLE : 0);
/*
* Ensure that there are not too many pages isolated from the LRU
@@ -606,12 +607,6 @@ isolate_migratepages_range(struct zone *zone, struct
compact_control *cc,
continue;
}
- if (!cc->sync)
- mode |= ISOLATE_ASYNC_MIGRATE;
-
- if (unevictable)
- mode |= ISOLATE_UNEVICTABLE;
-
lruvec = mem_cgroup_page_lruvec(page, zone);
/* Try isolate the page */
--
1.8.4.5
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