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mm, compaction: rename COMPACT_PARTIAL to COMPACT_SUCCESS

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COMPACT_PARTIAL has historically meant that compaction returned after
doing some work without fully compacting a zone.  It however didn't
distinguish if compaction terminated because it succeeded in creating
the requested high-order page.  This has changed recently and now we
only return COMPACT_PARTIAL when compaction thinks it succeeded, or the
high-order watermark check in compaction_suitable() passes and no
compaction needs to be done.

So at this point we can make the return value clearer by renaming it to
COMPACT_SUCCESS.  The next patch will remove some redundant tests for
success where compaction just returned COMPACT_SUCCESS.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Vlastimil Babka <[email protected]>
Tested-by: Lorenzo Stoakes <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Rik van Riel <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Vlastimil Babka 2016-10-07 16:57:41 -07:00 • committed by Linus Torvalds
commit cf378319d3
4 changed files with 12 additions and 12 deletions
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2
mm/vmscan.c
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@ -2495,7 +2495,7 @@ static inline bool should_continue_reclaim(struct pglist_data *pgdat,
continue;
switch (compaction_suitable(zone, sc->order, 0, sc->reclaim_idx)) {
case COMPACT_PARTIAL:
case COMPACT_SUCCESS:
case COMPACT_CONTINUE:
return false;
default: