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From:   Zi Yan <zi.yan@sent.com>
To:     David Hildenbrand <david@redhat.com>, linux-mm@kvack.org
Cc:     Matthew Wilcox <willy@infradead.org>,
        Vlastimil Babka <vbabka@suse.cz>,
        "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
        Mike Kravetz <mike.kravetz@oracle.com>,
        Michal Hocko <mhocko@kernel.org>,
        John Hubbard <jhubbard@nvidia.com>,
        linux-kernel@vger.kernel.org, Zi Yan <ziy@nvidia.com>
Subject: [RFC PATCH 11/15] mm/page_reporting: report pages at section size instead of MAX_ORDER.
Date:   Thu,  5 Aug 2021 15:02:49 -0400
Message-Id: <20210805190253.2795604-12-zi.yan@sent.com>
In-Reply-To: <20210805190253.2795604-1-zi.yan@sent.com>
References: <20210805190253.2795604-1-zi.yan@sent.com>
Reply-To: Zi Yan <ziy@nvidia.com>
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From: Zi Yan <ziy@nvidia.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@nvidia.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: linux-mm@kvack.org
Cc: linux-kernel@vger.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"
=20
-unsigned int page_reporting_order =3D MAX_ORDER;
+/* Set page_reporting_order at section size */
+unsigned int page_reporting_order =3D PFN_SECTION_SHIFT;
 module_param(page_reporting_order, uint, 0644);
 MODULE_PARM_DESC(page_reporting_order, "Set page reporting order");
=20
--=20
2.30.2