linux-kernel - [PATCH 10/10] mm/vmscan: use unsigned int for "kswapd_order" in struct pglist

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Message-Id: <20190725184253.21160-11-lpf.vector@gmail.com>
Date:   Fri, 26 Jul 2019 02:42:53 +0800
From:   Pengfei Li <lpf.vector@...il.com>
To:     akpm@...ux-foundation.org
Cc:     mgorman@...hsingularity.net, mhocko@...e.com, vbabka@...e.cz,
        cai@....pw, aryabinin@...tuozzo.com, osalvador@...e.de,
        rostedt@...dmis.org, mingo@...hat.com,
        pavel.tatashin@...rosoft.com, rppt@...ux.ibm.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Pengfei Li <lpf.vector@...il.com>
Subject: [PATCH 10/10] mm/vmscan: use unsigned int for "kswapd_order" in struct pglist_data

Because "kswapd_order" will never be negative, so just make it
unsigned int. And modify wakeup_kswapd(), kswapd_try_to_sleep()
and trace_mm_vmscan_kswapd_wake() accordingly.

Besides, make "order" unsigned int in two related trace functions.

Signed-off-by: Pengfei Li <lpf.vector@...il.com>
---
 include/linux/mmzone.h            |  4 ++--
 include/trace/events/compaction.h | 10 +++++-----
 include/trace/events/vmscan.h     |  4 ++--
 mm/vmscan.c                       |  6 +++---
 4 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 60bebdf47661..1196ed0cee67 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -717,7 +717,7 @@ typedef struct pglist_data {
 	wait_queue_head_t pfmemalloc_wait;
 	struct task_struct *kswapd;	/* Protected by
 					   mem_hotplug_begin/end() */
-	int kswapd_order;
+	unsigned int kswapd_order;
 	enum zone_type kswapd_classzone_idx;
 
 	int kswapd_failures;		/* Number of 'reclaimed == 0' runs */
@@ -802,7 +802,7 @@ static inline bool pgdat_is_empty(pg_data_t *pgdat)
 #include <linux/memory_hotplug.h>
 
 void build_all_zonelists(pg_data_t *pgdat);
-void wakeup_kswapd(struct zone *zone, gfp_t gfp_mask, int order,
+void wakeup_kswapd(struct zone *zone, gfp_t gfp_mask, unsigned int order,
 		   enum zone_type classzone_idx);
 bool __zone_watermark_ok(struct zone *z, unsigned int order, unsigned long mark,
 			 int classzone_idx, unsigned int alloc_flags,
diff --git a/include/trace/events/compaction.h b/include/trace/events/compaction.h
index f83ba40f9614..34a9fac3b4d6 100644
--- a/include/trace/events/compaction.h
+++ b/include/trace/events/compaction.h
@@ -314,13 +314,13 @@ TRACE_EVENT(mm_compaction_kcompactd_sleep,
 
 DECLARE_EVENT_CLASS(kcompactd_wake_template,
 
-	TP_PROTO(int nid, int order, enum zone_type classzone_idx),
+	TP_PROTO(int nid, unsigned int order, enum zone_type classzone_idx),
 
 	TP_ARGS(nid, order, classzone_idx),
 
 	TP_STRUCT__entry(
 		__field(int, nid)
-		__field(int, order)
+		__field(unsigned int, order)
 		__field(enum zone_type, classzone_idx)
 	),
 
@@ -330,7 +330,7 @@ DECLARE_EVENT_CLASS(kcompactd_wake_template,
 		__entry->classzone_idx = classzone_idx;
 	),
 
-	TP_printk("nid=%d order=%d classzone_idx=%-8s",
+	TP_printk("nid=%d order=%u classzone_idx=%-8s",
 		__entry->nid,
 		__entry->order,
 		__print_symbolic(__entry->classzone_idx, ZONE_TYPE))
@@ -338,14 +338,14 @@ DECLARE_EVENT_CLASS(kcompactd_wake_template,
 
 DEFINE_EVENT(kcompactd_wake_template, mm_compaction_wakeup_kcompactd,
 
-	TP_PROTO(int nid, int order, enum zone_type classzone_idx),
+	TP_PROTO(int nid, unsigned int order, enum zone_type classzone_idx),
 
 	TP_ARGS(nid, order, classzone_idx)
 );
 
 DEFINE_EVENT(kcompactd_wake_template, mm_compaction_kcompactd_wake,
 
-	TP_PROTO(int nid, int order, enum zone_type classzone_idx),
+	TP_PROTO(int nid, unsigned int order, enum zone_type classzone_idx),
 
 	TP_ARGS(nid, order, classzone_idx)
 );
diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h
index c37e2280e6dd..13c214f3750b 100644
--- a/include/trace/events/vmscan.h
+++ b/include/trace/events/vmscan.h
@@ -74,7 +74,7 @@ TRACE_EVENT(mm_vmscan_kswapd_wake,
 
 TRACE_EVENT(mm_vmscan_wakeup_kswapd,
 
-	TP_PROTO(int nid, int zid, int order, gfp_t gfp_flags),
+	TP_PROTO(int nid, int zid, unsigned int order, gfp_t gfp_flags),
 
 	TP_ARGS(nid, zid, order, gfp_flags),
 
@@ -92,7 +92,7 @@ TRACE_EVENT(mm_vmscan_wakeup_kswapd,
 		__entry->gfp_flags	= gfp_flags;
 	),
 
-	TP_printk("nid=%d order=%d gfp_flags=%s",
+	TP_printk("nid=%d order=%u gfp_flags=%s",
 		__entry->nid,
 		__entry->order,
 		show_gfp_flags(__entry->gfp_flags))
diff --git a/mm/vmscan.c b/mm/vmscan.c
index f4fd02ae233e..9d98a2e5f736 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3781,8 +3781,8 @@ static enum zone_type kswapd_classzone_idx(pg_data_t *pgdat,
 	return pgdat->kswapd_classzone_idx;
 }
 
-static void kswapd_try_to_sleep(pg_data_t *pgdat, int alloc_order, int reclaim_order,
-				unsigned int classzone_idx)
+static void kswapd_try_to_sleep(pg_data_t *pgdat, unsigned int alloc_order,
+			unsigned int reclaim_order, unsigned int classzone_idx)
 {
 	long remaining = 0;
 	DEFINE_WAIT(wait);
@@ -3956,7 +3956,7 @@ static int kswapd(void *p)
  * has failed or is not needed, still wake up kcompactd if only compaction is
  * needed.
  */
-void wakeup_kswapd(struct zone *zone, gfp_t gfp_flags, int order,
+void wakeup_kswapd(struct zone *zone, gfp_t gfp_flags, unsigned int order,
 		   enum zone_type classzone_idx)
 {
 	pg_data_t *pgdat;
-- 
2.21.0