linux-kernel - [RFC v2 29/43] PKRAM: ensure memblocks with preserved pages init'd for numa

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Message-Id: <1617140178-8773-30-git-send-email-anthony.yznaga@oracle.com>
Date:   Tue, 30 Mar 2021 14:36:04 -0700
From:   Anthony Yznaga <anthony.yznaga@...cle.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     willy@...radead.org, corbet@....net, tglx@...utronix.de,
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Subject: [RFC v2 29/43] PKRAM: ensure memblocks with preserved pages init'd for numa

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@...cle.com>
---
 mm/pkram.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/mm/pkram.c b/mm/pkram.c
index aea069cc49be..b8d6b549fa6c 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"
 
 #define PKRAM_MAGIC		0x706B726D
@@ -226,6 +227,14 @@ 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);
 }
-- 
1.8.3.1