linux-kernel - [RFC 28/43] PKRAM: ensure memblocks with preserved pages init'd for numa

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Date:   Wed,  6 May 2020 17:41:54 -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 28/43] 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 | 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