[PATCH v2 15/15] mm: Pass order to node_reclaim() in GFP flags

[Matthew Wilcox <willy@infradead.org>]

From: "Matthew Wilcox (Oracle)" <willy@infradead.org>

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 include/trace/events/vmscan.h |  8 +++-----
 mm/internal.h                 |  5 ++---
 mm/page_alloc.c               |  2 +-
 mm/vmscan.c                   | 13 ++++++-------
 4 files changed, 12 insertions(+), 16 deletions(-)

diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h
index a6b1b20333b4..2714d9ef54e6 100644
--- a/include/trace/events/vmscan.h
+++ b/include/trace/events/vmscan.h
@@ -460,25 +460,23 @@ TRACE_EVENT(mm_vmscan_inactive_list_is_low,
 
 TRACE_EVENT(mm_vmscan_node_reclaim_begin,
 
-	TP_PROTO(int nid, int order, gfp_t gfp_flags),
+	TP_PROTO(int nid, gfp_t gfp_flags),
 
-	TP_ARGS(nid, order, gfp_flags),
+	TP_ARGS(nid, gfp_flags),
 
 	TP_STRUCT__entry(
 		__field(int, nid)
-		__field(int, order)
 		__field(gfp_t, gfp_flags)
 	),
 
 	TP_fast_assign(
 		__entry->nid = nid;
-		__entry->order = order;
 		__entry->gfp_flags = gfp_flags;
 	),
 
 	TP_printk("nid=%d order=%d gfp_flags=%s",
 		__entry->nid,
-		__entry->order,
+		gfp_order(__entry->gfp_flags),
 		show_gfp_flags(__entry->gfp_flags))
 );
 
diff --git a/mm/internal.h b/mm/internal.h
index 9eeaf2b95166..353cefdc3f34 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -457,10 +457,9 @@ static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
 #define NODE_RECLAIM_SUCCESS	1
 
 #ifdef CONFIG_NUMA
-extern int node_reclaim(struct pglist_data *, gfp_t, unsigned int);
+extern int node_reclaim(struct pglist_data *, gfp_t);
 #else
-static inline int node_reclaim(struct pglist_data *pgdat, gfp_t mask,
-				unsigned int order)
+static inline int node_reclaim(struct pglist_data *pgdat, gfp_t mask)
 {
 	return NODE_RECLAIM_NOSCAN;
 }
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 29daaf4ae4fb..5365ee2e8c0b 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3595,7 +3595,7 @@ get_page_from_freelist(gfp_t gfp_mask, int alloc_flags,
 			    !zone_allows_reclaim(ac->preferred_zoneref->zone, zone))
 				continue;
 
-			ret = node_reclaim(zone->zone_pgdat, gfp_mask, order);
+			ret = node_reclaim(zone->zone_pgdat, gfp_mask);
 			switch (ret) {
 			case NODE_RECLAIM_NOSCAN:
 				/* did not scan */
diff --git a/mm/vmscan.c b/mm/vmscan.c
index e4d4d9c1d7a9..b7f141de9814 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -4124,17 +4124,17 @@ static unsigned long node_pagecache_reclaimable(struct pglist_data *pgdat)
 /*
  * Try to free up some pages from this node through reclaim.
  */
-static int __node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned int order)
+static int __node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask)
 {
 	/* Minimum pages needed in order to stay on node */
-	const unsigned long nr_pages = 1 << order;
+	const unsigned long nr_pages = 1UL << gfp_order(gfp_mask);
 	struct task_struct *p = current;
 	struct reclaim_state reclaim_state;
 	unsigned int noreclaim_flag;
 	struct scan_control sc = {
 		.nr_to_reclaim = max(nr_pages, SWAP_CLUSTER_MAX),
 		.gfp_mask = current_gfp_context(gfp_mask),
-		.order = order,
+		.order = gfp_order(gfp_mask),
 		.priority = NODE_RECLAIM_PRIORITY,
 		.may_writepage = !!(node_reclaim_mode & RECLAIM_WRITE),
 		.may_unmap = !!(node_reclaim_mode & RECLAIM_UNMAP),
@@ -4142,8 +4142,7 @@ static int __node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned in
 		.reclaim_idx = gfp_zone(gfp_mask),
 	};
 
-	trace_mm_vmscan_node_reclaim_begin(pgdat->node_id, order,
-					   sc.gfp_mask);
+	trace_mm_vmscan_node_reclaim_begin(pgdat->node_id, sc.gfp_mask);
 
 	cond_resched();
 	fs_reclaim_acquire(sc.gfp_mask);
@@ -4177,7 +4176,7 @@ static int __node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned in
 	return sc.nr_reclaimed >= nr_pages;
 }
 
-int node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned int order)
+int node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask)
 {
 	int ret;
 
@@ -4213,7 +4212,7 @@ int node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned int order)
 	if (test_and_set_bit(PGDAT_RECLAIM_LOCKED, &pgdat->flags))
 		return NODE_RECLAIM_NOSCAN;
 
-	ret = __node_reclaim(pgdat, gfp_mask, order);
+	ret = __node_reclaim(pgdat, gfp_mask);
 	clear_bit(PGDAT_RECLAIM_LOCKED, &pgdat->flags);
 
 	if (!ret)
-- 
2.20.1