[RFC 10/13] mm, compaction: cleanup unused functions

Vlastimil Babka
2016-05-10T07:38:35Z

Since kswapd compaction moved to kcompactd, compact_pgdat() is not called
anymore, so we remove it. The only caller of __compact_pgdat() is
compact_node(), so we merge them and remove code that was only reachable from
kswapd.

Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
---
include/linux/compaction.h | 5 ----
mm/compaction.c | 60 +++++++++++++---------------------------------
2 files changed, 17 insertions(+), 48 deletions(-)

diff --git a/include/linux/compaction.h b/include/linux/compaction.h
index cd3a59f1601e..eeaed24e87a8 100644
--- a/include/linux/compaction.h
+++ b/include/linux/compaction.h
@@ -67,7 +67,6 @@ extern enum compact_result try_to_compact_pages(gfp_t gfp_mask,
unsigned int order,
unsigned int alloc_flags, const struct alloc_context *ac,
enum compact_priority prio);
-extern void compact_pgdat(pg_data_t *pgdat, int order);
extern void reset_isolation_suitable(pg_data_t *pgdat);
extern enum compact_result compaction_suitable(struct zone *zone, int order,
unsigned int alloc_flags, int classzone_idx);
@@ -151,10 +150,6 @@ extern void kcompactd_stop(int nid);
extern void wakeup_kcompactd(pg_data_t *pgdat, int order, int classzone_idx);

#else
-static inline void compact_pgdat(pg_data_t *pgdat, int order)
-{
-}
-
static inline void reset_isolation_suitable(pg_data_t *pgdat)
{
}
diff --git a/mm/compaction.c b/mm/compaction.c
index 1ce6783d3ead..7d0935e1a195 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1678,10 +1678,18 @@ enum compact_result try_to_compact_pages(gfp_t gfp_mask, unsigned int order,

/* Compact all zones within a node */
-static void __compact_pgdat(pg_data_t *pgdat, struct compact_control *cc)
+static void compact_node(int nid)
{
+ pg_data_t *pgdat = NODE_DATA(nid);
int zoneid;
struct zone *zone;
+ struct compact_control cc = {
+ .order = -1,
+ .mode = MIGRATE_SYNC,
+ .ignore_skip_hint = true,
+ .whole_zone = true,
+ };
+

for (zoneid = 0; zoneid < MAX_NR_ZONES; zoneid++) {

@@ -1689,53 +1697,19 @@ static void __compact_pgdat(pg_data_t *pgdat, struct compact_control *cc)
if (!populated_zone(zone))
continue;

- cc->nr_freepages = 0;
- cc->nr_migratepages = 0;
- cc->zone = zone;
- INIT_LIST_HEAD(&cc->freepages);
- INIT_LIST_HEAD(&cc->migratepages);
-
- if (is_via_compact_memory(cc->order) ||
- !compaction_deferred(zone, cc->order))
- compact_zone(zone, cc);
-
- VM_BUG_ON(!list_empty(&cc->freepages));
- VM_BUG_ON(!list_empty(&cc->migratepages));
+ cc.nr_freepages = 0;
+ cc.nr_migratepages = 0;
+ cc.zone = zone;
+ INIT_LIST_HEAD(&cc.freepages);
+ INIT_LIST_HEAD(&cc.migratepages);

- if (is_via_compact_memory(cc->order))
- continue;
+ compact_zone(zone, &cc);

- if (zone_watermark_ok(zone, cc->order,
- low_wmark_pages(zone), 0, 0))
- compaction_defer_reset(zone, cc->order, false);
+ VM_BUG_ON(!list_empty(&cc.freepages));
+ VM_BUG_ON(!list_empty(&cc.migratepages));
}
}

-void compact_pgdat(pg_data_t *pgdat, int order)
-{
- struct compact_control cc = {
- .order = order,
- .mode = MIGRATE_ASYNC,
- };
-
- if (!order)
- return;
-
- __compact_pgdat(pgdat, &cc);
-}
-
-static void compact_node(int nid)
-{
- struct compact_control cc = {
- .order = -1,
- .mode = MIGRATE_SYNC,
- .ignore_skip_hint = true,
- .whole_zone = true,
- };
-
- __compact_pgdat(NODE_DATA(nid), &cc);
-}
-
/* Compact all nodes in the system */
static void compact_nodes(void)
{
--
2.8.2