linux-kernel - [PATCH v2 4/5] device-dax/kmem: Set node state as N_DEMOTION

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Date:   Wed, 13 Apr 2022 14:52:05 +0530
From:   Jagdish Gediya <jvgediya@...ux.ibm.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     akpm@...ux-foundation.org, aneesh.kumar@...ux.ibm.com,
        baolin.wang@...ux.alibaba.com, dave.hansen@...ux.intel.com,
        ying.huang@...el.com, Jagdish Gediya <jvgediya@...ux.ibm.com>
Subject: [PATCH v2 4/5] device-dax/kmem: Set node state as N_DEMOTION_TARGETS

Set dax-device node as N_DEMOTION_TARGETS so that it
can be used as demotion target.

In future, support should be added to distinguish the
dax-devices which are not preferred as demotion target
e.g. HBM, for such devices, node shouldn't be set to
N_DEMOTION_TARGETS.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
Signed-off-by: Jagdish Gediya <jvgediya@...ux.ibm.com>
---
 drivers/dax/kmem.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/dax/kmem.c b/drivers/dax/kmem.c
index a37622060fff..f42ab9d04bdf 100644
--- a/drivers/dax/kmem.c
+++ b/drivers/dax/kmem.c
@@ -147,6 +147,8 @@ static int dev_dax_kmem_probe(struct dev_dax *dev_dax)
 
 	dev_set_drvdata(dev, data);
 
+	node_set_state(numa_node, N_DEMOTION_TARGETS);
+
 	return 0;
 
 err_request_mem:
-- 
2.35.1