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From:   Anthony Yznaga <anthony.yznaga@oracle.com>
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Subject: [RFC 28/43] PKRAM: ensure memblocks with preserved pages init'd for numa
Date:   Wed,  6 May 2020 17:41:54 -0700
Message-Id: <1588812129-8596-29-git-send-email-anthony.yznaga@oracle.com>
In-Reply-To: <1588812129-8596-1-git-send-email-anthony.yznaga@oracle.com>
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

In order to facilitate fast initialization of page structs for
preserved pages, memblocks with preserved pages must not cross
numa node boundaries and must have a node id assigned to them.

Signed-off-by: Anthony Yznaga <anthony.yznaga@oracle.com>
---
 mm/pkram.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/mm/pkram.c b/mm/pkram.c
index a5e539052af6..97a7dd0a5b7d 100644
--- a/mm/pkram.c
+++ b/mm/pkram.c
@@ -21,6 +21,7 @@
 #include <linux/sysfs.h>
 #include <linux/types.h>
 
+#include <asm/numa.h>
 #include "internal.h"
 
 
@@ -242,6 +243,15 @@ void __init pkram_reserve(void)
 		return;
 	}
 
+	/*
+	 * Fix up the reserved memblock list to ensure the
+	 * memblock regions are split along node boundaries
+	 * and have a node ID set.  This will allow the page
+	 * structs for the preserved pages to be initialized
+	 * more efficiently.
+	 */
+	numa_isolate_memblocks();
+
 done:
 	pr_info("PKRAM: %lu pages reserved\n", pkram_reserved_pages);
 }
-- 
2.13.3