+ mm-compaction-early-termination-in-compact_nodes.patch added to mm-unstable branch

+ mm-compaction-early-termination-in-compact_nodes.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm: compaction: early termination in compact_nodes()
has been added to the -mm mm-unstable branch.  Its filename is
     mm-compaction-early-termination-in-compact_nodes.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-compaction-early-termination-in-compact_nodes.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Kefeng Wang <wangkefeng.wang@huawei.com>
Subject: mm: compaction: early termination in compact_nodes()
Date: Thu, 8 Feb 2024 10:25:08 +0800

No need to continue try compact memory if pending fatal signal, allow loop
termination earlier in compact_nodes().

Link: https://lkml.kernel.org/r/20240208022508.1771534-1-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/compaction.c |   24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

--- a/mm/compaction.c~mm-compaction-early-termination-in-compact_nodes
+++ a/mm/compaction.c
@@ -2895,7 +2895,7 @@ enum compact_result try_to_compact_pages
  * reaching score targets due to various back-off conditions, such as,
  * contention on per-node or per-zone locks.
  */
-static void compact_node(pg_data_t *pgdat, bool proactive)
+static int compact_node(pg_data_t *pgdat, bool proactive)
 {
 	int zoneid;
 	struct zone *zone;
@@ -2913,6 +2913,9 @@ static void compact_node(pg_data_t *pgda
 		if (!populated_zone(zone))
 			continue;
 
+		if (fatal_signal_pending(current))
+			return -EINTR;
+
 		cc.zone = zone;
 
 		compact_zone(&cc, NULL);
@@ -2924,18 +2927,25 @@ static void compact_node(pg_data_t *pgda
 					     cc.total_free_scanned);
 		}
 	}
+
+	return 0;
 }
 
 /* Compact all zones of all nodes in the system */
-static void compact_nodes(void)
+static int compact_nodes(void)
 {
-	int nid;
+	int ret, nid;
 
 	/* Flush pending updates to the LRU lists */
 	lru_add_drain_all();
 
-	for_each_online_node(nid)
-		compact_node(NODE_DATA(nid), false);
+	for_each_online_node(nid) {
+		ret = compact_node(NODE_DATA(nid), false);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
 }
 
 static int compaction_proactiveness_sysctl_handler(struct ctl_table *table, int write,
@@ -2981,9 +2991,9 @@ static int sysctl_compaction_handler(str
 		return -EINVAL;
 
 	if (write)
-		compact_nodes();
+		ret = compact_nodes();
 
-	return 0;
+	return ret;
 }
 
 #if defined(CONFIG_SYSFS) && defined(CONFIG_NUMA)
_

Patches currently in -mm which might be from wangkefeng.wang@huawei.com are

mm-memory-use-nth_page-in-clear-copy_subpage.patch
s390-use-pfn_swap_entry_folio-in-ptep_zap_swap_entry.patch
mm-use-pfn_swap_entry_folio-in-__split_huge_pmd_locked.patch
mm-use-pfn_swap_entry_to_folio-in-zap_huge_pmd.patch
mm-use-pfn_swap_entry_folio-in-copy_nonpresent_pte.patch
mm-convert-to-should_zap_page-to-should_zap_folio.patch
mm-convert-to-should_zap_page-to-should_zap_folio-fix.patch
mm-convert-mm_counter-to-take-a-folio.patch
mm-convert-mm_counter_file-to-take-a-folio.patch
mm-memory-move-mem_cgroup_charge-into-alloc_anon_folio.patch
mm-compaction-refactor-compact_node.patch
mm-compaction-early-termination-in-compact_nodes.patch