From: Zi Yan <zi.yan@sent.com>
To: linux-mm@kvack.org
Cc: Zi Yan <ziy@nvidia.com>, David Hildenbrand <david@redhat.com>,
Matthew Wilcox <willy@infradead.org>,
Vlastimil Babka <vbabka@suse.cz>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
Mike Kravetz <mike.kravetz@oracle.com>,
John Hubbard <jhubbard@nvidia.com>,
Yang Shi <shy828301@gmail.com>,
David Rientjes <rientjes@google.com>,
James Houghton <jthoughton@google.com>,
Mike Rapoport <rppt@kernel.org>,
Muchun Song <songmuchun@bytedance.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org
Subject: [PATCH v1 04/12] mm: prevent pageblock size being larger than section size.
Date: Wed, 21 Sep 2022 21:12:44 -0400 [thread overview]
Message-ID: <20220922011252.2266780-5-zi.yan@sent.com> (raw)
In-Reply-To: <20220922011252.2266780-1-zi.yan@sent.com>
From: Zi Yan <ziy@nvidia.com>
Only physical pages from a section can be guaranteed to be contiguous
and so far a pageblock can only group contiguous physical pages by
design. Set pageblock_order properly to prevent pageblock going beyond
section size.
Signed-off-by: Zi Yan <ziy@nvidia.com>
Cc: Wei Yang <richard.weiyang@linux.alibaba.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org
---
include/linux/pageblock-flags.h | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/include/linux/pageblock-flags.h b/include/linux/pageblock-flags.h
index e83c4c095041..95589b24fff9 100644
--- a/include/linux/pageblock-flags.h
+++ b/include/linux/pageblock-flags.h
@@ -47,8 +47,11 @@ extern unsigned int pageblock_order;
#else /* CONFIG_HUGETLB_PAGE */
-/* If huge pages are not used, group by MAX_ORDER_NR_PAGES */
-#define pageblock_order MAX_ORDER
+/*
+ * If huge pages are not used, group by MAX_ORDER_NR_PAGES or
+ * PAGES_PER_SECTION when MAX_ORDER_NR_PAGES is larger.
+ */
+#define pageblock_order (min(PFN_SECTION_SHIFT, MAX_ORDER))
#endif /* CONFIG_HUGETLB_PAGE */
--
2.35.1
next prev parent reply other threads:[~2022-09-22 1:13 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-22 1:12 [PATCH v1 00/12] Make MAX_ORDER adjustable as a kernel boot time parameter Zi Yan
2022-09-22 1:12 ` [PATCH v1 01/12] mm: rectify MAX_ORDER semantics to be the largest page order from buddy allocator Zi Yan
2022-09-22 1:12 ` [PATCH v1 02/12] mm: check page validity when find a buddy page in a non-contiguous zone Zi Yan
2022-09-22 1:12 ` [PATCH v1 03/12] mm: adapt deferred struct page init to new MAX_ORDER Zi Yan
2022-09-22 1:12 ` Zi Yan [this message]
2022-09-22 1:12 ` [PATCH v1 05/12] fs: proc: use pageblock_nr_pages for reschedule period in read_kcore() Zi Yan
2022-09-22 1:12 ` [PATCH v1 06/12] virtio: virtio_balloon: use pageblock_order instead of MAX_ORDER Zi Yan
2022-09-22 1:12 ` [PATCH v1 07/12] mm/page_reporting: set page_reporting_order to -1 to prevent it running Zi Yan
2022-09-22 1:12 ` [PATCH v1 08/12] mm: replace MAX_ORDER when it is used to indicate max physical contiguity Zi Yan
2022-09-22 1:12 ` [PATCH v1 09/12] mm: Make MAX_ORDER of buddy allocator configurable via Kconfig SET_MAX_ORDER Zi Yan
2022-09-22 1:12 ` [PATCH v1 10/12] mm: convert MAX_ORDER sized static arrays to dynamic ones Zi Yan
2022-09-22 1:12 ` [PATCH v1 11/12] mm: introduce MIN_MAX_ORDER to replace MAX_ORDER as compile time constant Zi Yan
2022-09-22 1:12 ` [PATCH v1 12/12] mm: make MAX_ORDER a kernel boot time parameter Zi Yan
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