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| author | David Rientjes <rientjes@google.com> | 2014-04-07 15:37:34 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-04-07 16:35:55 -0700 |
| commit | da1c67a76f7cf2b3404823d24f9f10fa91aa5dc5 (patch) | |
| tree | 573c8ad7aeeb67e0e368510b95ef1d660adec1d3 /mm/compaction.c | |
| parent | 539a13b47e462d28c48f076c63871580f694a366 (diff) | |
| download | lwn-da1c67a76f7cf2b3404823d24f9f10fa91aa5dc5.tar.gz lwn-da1c67a76f7cf2b3404823d24f9f10fa91aa5dc5.zip | |
mm, compaction: determine isolation mode only once
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 <rientjes@google.com>
Cc: Mel Gorman <mgorman@suse.de>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/compaction.c')
| -rw-r--r-- | mm/compaction.c | 9 |
1 files changed, 2 insertions, 7 deletions
diff --git a/mm/compaction.c b/mm/compaction.c index 054c28b51c75..37f976287068 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -460,12 +460,13 @@ 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 @@ -608,12 +609,6 @@ 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 */ |