linux-kernel - [RFC PATCH 11/15] mm/page_reporting: report pages at section size instead of MAX

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Date:   Thu,  5 Aug 2021 15:02:49 -0400
From:   Zi Yan <zi.yan@...t.com>
To:     David Hildenbrand <david@...hat.com>, linux-mm@...ck.org
Cc:     Matthew Wilcox <willy@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Michal Hocko <mhocko@...nel.org>,
        John Hubbard <jhubbard@...dia.com>,
        linux-kernel@...r.kernel.org, Zi Yan <ziy@...dia.com>
Subject: [RFC PATCH 11/15] mm/page_reporting: report pages at section size instead of MAX_ORDER.

From: Zi Yan <ziy@...dia.com>

page_reporting_order was set to MAX_ORDER, which is always smaller than
a memory section size. An upcoming change will make MAX_ORDER larger
than a memory section size. Set page_reporting_order to
PFN_SECTION_SHIFT to match existing size assumption.

Signed-off-by: Zi Yan <ziy@...dia.com>
Cc: David Hildenbrand <david@...hat.com>
Cc: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org
---
 mm/page_reporting.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/page_reporting.c b/mm/page_reporting.c
index 382958eef8a9..dc4a2d699862 100644
--- a/mm/page_reporting.c
+++ b/mm/page_reporting.c
@@ -11,7 +11,8 @@
 #include "page_reporting.h"
 #include "internal.h"
 
-unsigned int page_reporting_order = MAX_ORDER;
+/* Set page_reporting_order at section size */
+unsigned int page_reporting_order = PFN_SECTION_SHIFT;
 module_param(page_reporting_order, uint, 0644);
 MODULE_PARM_DESC(page_reporting_order, "Set page reporting order");
 
-- 
2.30.2