linux-kernel - [PATCH v3 5/7] mm: demotion: Build demotion list based on N_DEMOTION

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Date:   Sat, 23 Apr 2022 01:25:14 +0530
From:   Jagdish Gediya <jvgediya@...ux.ibm.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        akpm@...ux-foundation.org
Cc:     baolin.wang@...ux.alibaba.com, dave.hansen@...ux.intel.com,
        ying.huang@...el.com, aneesh.kumar@...ux.ibm.com,
        shy828301@...il.com, weixugc@...gle.com, gthelen@...gle.com,
        dan.j.williams@...el.com, Jagdish Gediya <jvgediya@...ux.ibm.com>
Subject: [PATCH v3 5/7] mm: demotion: Build demotion list based on N_DEMOTION_TARGETS

Only nodes which has state N_DEMOTION_TARGETS should be
used as demotion targets, make nodes which are not in demotion
targets as source nodes while building demotion target list
so that demotion targets are only chosen from N_DEMOTION_TARGETS.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
Signed-off-by: Jagdish Gediya <jvgediya@...ux.ibm.com>
---
 mm/migrate.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index 8bbe1e478122..5b92a09fbe4a 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2366,10 +2366,10 @@ static void __set_migration_target_nodes(void)
 	disable_all_migrate_targets();
 
 	/*
-	 * Allocations go close to CPUs, first.  Assume that
-	 * the migration path starts at the nodes with CPUs.
+	 * Some systems can have DRAM(fast memory) only NUMA nodes, demotion targets
+	 * need to be found for them as well.
 	 */
-	next_pass = node_states[N_CPU];
+	nodes_andnot(next_pass, node_states[N_ONLINE], node_states[N_DEMOTION_TARGETS]);
 again:
 	this_pass = next_pass;
 	next_pass = NODE_MASK_NONE;
-- 
2.35.1