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From:   Johannes Weiner <hannes@cmpxchg.org>
To:     linux-mm@kvack.org
Cc:     Kaiyang Zhao <kaiyang2@cs.cmu.edu>,
        Mel Gorman <mgorman@techsingularity.net>,
        Vlastimil Babka <vbabka@suse.cz>,
        David Rientjes <rientjes@google.com>,
        linux-kernel@vger.kernel.org, kernel-team@fb.com
Subject: [RFC PATCH 18/26] mm: compaction: remove unnecessary is_via_compact_memory() checks
Date:   Tue, 18 Apr 2023 15:13:05 -0400
Message-Id: <20230418191313.268131-19-hannes@cmpxchg.org>
In-Reply-To: <20230418191313.268131-1-hannes@cmpxchg.org>
References: <20230418191313.268131-1-hannes@cmpxchg.org>
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Remove from all paths not reachable via /proc/sys/vm/compact_memory.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
---
 mm/compaction.c | 11 +----------
 mm/vmscan.c     |  8 +-------
 2 files changed, 2 insertions(+), 17 deletions(-)

diff --git a/mm/compaction.c b/mm/compaction.c
index d4b7d5b36600..0aa2a0a192dc 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -2265,9 +2265,6 @@ bool compaction_zonelist_suitable(struct alloc_context *ac, int order,
 		unsigned long available;
 		unsigned long watermark;
 
-		if (is_via_compact_memory(order))
-			return true;
-
 		/* Allocation can already succeed, nothing to do */
 		watermark = wmark_pages(zone, alloc_flags & ALLOC_WMARK_MASK);
 		if (zone_watermark_ok(zone, order, watermark,
@@ -2808,9 +2805,6 @@ static bool kcompactd_node_suitable(pg_data_t *pgdat)
 		if (!populated_zone(zone))
 			continue;
 
-		if (is_via_compact_memory(pgdat->kcompactd_max_order))
-			return true;
-
 		/* Allocation can already succeed, check other zones */
 		if (zone_watermark_ok(zone, pgdat->kcompactd_max_order,
 				      min_wmark_pages(zone),
@@ -2855,9 +2849,6 @@ static void kcompactd_do_work(pg_data_t *pgdat)
 		if (compaction_deferred(zone, cc.order))
 			continue;
 
-		if (is_via_compact_memory(cc.order))
-			goto compact;
-
 		/* Allocation can already succeed, nothing to do */
 		if (zone_watermark_ok(zone, cc.order,
 				      min_wmark_pages(zone), zoneid, 0))
@@ -2866,7 +2857,7 @@ static void kcompactd_do_work(pg_data_t *pgdat)
 		if (compaction_suitable(zone, cc.order,
 					zoneid) != COMPACT_CONTINUE)
 			continue;
-compact:
+
 		if (kthread_should_stop())
 			return;
 
diff --git a/mm/vmscan.c b/mm/vmscan.c
index a0ebdbf3efcf..ee8c8ca2e7b5 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -6076,9 +6076,6 @@ static inline bool should_continue_reclaim(struct pglist_data *pgdat,
 		if (!managed_zone(zone))
 			continue;
 
-		if (sc->order == -1) /* is_via_compact_memory() */
-			return false;
-
 		/* Allocation can already succeed, nothing to do */
 		if (zone_watermark_ok(zone, sc->order, min_wmark_pages(zone),
 				      sc->reclaim_idx, 0))
@@ -6275,9 +6272,6 @@ static inline bool compaction_ready(struct zone *zone, struct scan_control *sc)
 	unsigned long watermark;
 	unsigned long free_pages;
 
-	if (sc->order == -1) /* is_via_compact_memory() */
-		goto suitable;
-
 	/* Allocation can already succeed, nothing to do */
 	if (zone_watermark_ok(zone, sc->order, min_wmark_pages(zone),
 			      sc->reclaim_idx, 0))
@@ -6287,7 +6281,7 @@ static inline bool compaction_ready(struct zone *zone, struct scan_control *sc)
 	if (compaction_suitable(zone, sc->order,
 				sc->reclaim_idx) == COMPACT_SKIPPED)
 		return false;
-suitable:
+
 	/*
 	 * Compaction is already possible, but it takes time to run and there
 	 * are potentially other callers using the pages just freed. So proceed
-- 
2.39.2