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Message-ID: <20230218002819.1486479-7-jthoughton@google.com>
Date: Sat, 18 Feb 2023 00:27:39 +0000
From: James Houghton <jthoughton@...gle.com>
To: Mike Kravetz <mike.kravetz@...cle.com>,
Muchun Song <songmuchun@...edance.com>,
Peter Xu <peterx@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>
Cc: David Hildenbrand <david@...hat.com>,
David Rientjes <rientjes@...gle.com>,
Axel Rasmussen <axelrasmussen@...gle.com>,
Mina Almasry <almasrymina@...gle.com>,
"Zach O'Keefe" <zokeefe@...gle.com>,
Manish Mishra <manish.mishra@...anix.com>,
Naoya Horiguchi <naoya.horiguchi@....com>,
"Dr . David Alan Gilbert" <dgilbert@...hat.com>,
"Matthew Wilcox (Oracle)" <willy@...radead.org>,
Vlastimil Babka <vbabka@...e.cz>,
Baolin Wang <baolin.wang@...ux.alibaba.com>,
Miaohe Lin <linmiaohe@...wei.com>,
Yang Shi <shy828301@...il.com>,
Frank van der Linden <fvdl@...gle.com>,
Jiaqi Yan <jiaqiyan@...gle.com>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org,
James Houghton <jthoughton@...gle.com>
Subject: [PATCH v2 06/46] hugetlb: add CONFIG_HUGETLB_HIGH_GRANULARITY_MAPPING
This adds the Kconfig to enable or disable high-granularity mapping.
Each architecture must explicitly opt-in to it (via
ARCH_WANT_HUGETLB_HIGH_GRANULARITY_MAPPING), but when opted in, HGM will
be enabled by default if HUGETLB_PAGE is enabled.
Signed-off-by: James Houghton <jthoughton@...gle.com>
diff --git a/fs/Kconfig b/fs/Kconfig
index 2685a4d0d353..a072bbe3439a 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -246,6 +246,18 @@ config HUGETLBFS
config HUGETLB_PAGE
def_bool HUGETLBFS
+config ARCH_WANT_HUGETLB_HIGH_GRANULARITY_MAPPING
+ bool
+
+config HUGETLB_HIGH_GRANULARITY_MAPPING
+ bool "HugeTLB high-granularity mapping support"
+ default n
+ depends on ARCH_WANT_HUGETLB_HIGH_GRANULARITY_MAPPING
+ help
+ HugeTLB high-granularity mapping (HGM) allows userspace to issue
+ UFFDIO_CONTINUE on HugeTLB mappings in PAGE_SIZE chunks.
+ HGM is incompatible with the HugeTLB Vmemmap Optimization (HVO).
+
#
# Select this config option from the architecture Kconfig, if it is preferred
# to enable the feature of HugeTLB Vmemmap Optimization (HVO).
@@ -257,6 +269,7 @@ config HUGETLB_PAGE_OPTIMIZE_VMEMMAP
def_bool HUGETLB_PAGE
depends on ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
depends on SPARSEMEM_VMEMMAP
+ depends on !HUGETLB_HIGH_GRANULARITY_MAPPING
config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON
bool "HugeTLB Vmemmap Optimization (HVO) defaults to on"
--
2.39.2.637.g21b0678d19-goog
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