mm, compaction: add migratetype to compact_control

Preparation patch.  We are going to need migratetype at lower layers
than compact_zone() and compact_finished().

Link: http://lkml.kernel.org/r/20170307131545.28577-7-vbabka@suse.cz
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/compaction.c b/mm/compaction.c
index a20876e..365b3c8 100644 (file)
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1279,10 +1279,11 @@ static inline bool is_via_compact_memory(int order)
        return order == -1;
 }
 
-static enum compact_result __compact_finished(struct zone *zone, struct compact_control *cc,
-                           const int migratetype)
+static enum compact_result __compact_finished(struct zone *zone,
+                                               struct compact_control *cc)
 {
        unsigned int order;
+       const int migratetype = cc->migratetype;
 
        if (cc->contended || fatal_signal_pending(current))
                return COMPACT_CONTENDED;
@@ -1338,12 +1339,11 @@ static enum compact_result __compact_finished(struct zone *zone, struct compact_
 }
 
 static enum compact_result compact_finished(struct zone *zone,
-                       struct compact_control *cc,
-                       const int migratetype)
+                       struct compact_control *cc)
 {
        int ret;
 
-       ret = __compact_finished(zone, cc, migratetype);
+       ret = __compact_finished(zone, cc);
        trace_mm_compaction_finished(zone, cc->order, ret);
        if (ret == COMPACT_NO_SUITABLE_PAGE)
                ret = COMPACT_CONTINUE;
@@ -1476,9 +1476,9 @@ static enum compact_result compact_zone(struct zone *zone, struct compact_contro
        enum compact_result ret;
        unsigned long start_pfn = zone->zone_start_pfn;
        unsigned long end_pfn = zone_end_pfn(zone);
-       const int migratetype = gfpflags_to_migratetype(cc->gfp_mask);
        const bool sync = cc->mode != MIGRATE_ASYNC;
 
+       cc->migratetype = gfpflags_to_migratetype(cc->gfp_mask);
        ret = compaction_suitable(zone, cc->order, cc->alloc_flags,
                                                        cc->classzone_idx);
        /* Compaction is likely to fail */
@@ -1528,8 +1528,7 @@ static enum compact_result compact_zone(struct zone *zone, struct compact_contro
 
        migrate_prep_local();
 
-       while ((ret = compact_finished(zone, cc, migratetype)) ==
-                                               COMPACT_CONTINUE) {
+       while ((ret = compact_finished(zone, cc)) == COMPACT_CONTINUE) {
                int err;
 
                switch (isolate_migratepages(zone, cc)) {

diff --git a/mm/internal.h b/mm/internal.h
index 004471b..e7e709f 100644 (file)
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -193,6 +193,7 @@ struct compact_control {
        unsigned long last_migrated_pfn;/* Not yet flushed page being freed */
        const gfp_t gfp_mask;           /* gfp mask of a direct compactor */
        int order;                      /* order a direct compactor needs */
+       int migratetype;                /* migratetype of direct compactor */
        const unsigned int alloc_flags; /* alloc flags of a direct compactor */
        const int classzone_idx;        /* zone index of a direct compactor */
        enum migrate_mode mode;         /* Async or sync migration mode */