The patch titled
Subject: mm/hugetlb: make alloc_gigantic_page() available for general use
has been added to the -mm tree. Its filename is
mm-hugetlb-make-alloc_gigantic_page-available-for-general-use.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-hugetlb-make-alloc_gigantic_page-available-for-general-use.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-hugetlb-make-alloc_gigantic_page-available-for-general-use.patch
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------------------------------------------------------
From: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Subject: mm/hugetlb: make alloc_gigantic_page() available for general use
Patch series "mm/debug: Add tests validating architecture page table
helpers", v5.
This series adds a test validation for architecture exported page table
helpers. Patch in the series adds basic transformation tests at various
levels of the page table. Before that it exports gigantic page allocation
function from HugeTLB.
This test was originally suggested by Catalin during arm64 THP migration
RFC discussion earlier. Going forward it can include more specific tests
with respect to various generic MM functions like THP, HugeTLB etc and
platform specific tests.
https://lore.kernel.org/linux-mm/20190628102003.GA56463@xxxxxxxxxxxxxxxxxxxx/
This patch (of 2):
alloc_gigantic_page() implements an allocation method where it scans over
various zones looking for a large contiguous memory block which could not
have been allocated through the buddy allocator. A subsequent patch which
tests arch page table helpers needs such a method to allocate PUD_SIZE
sized memory block. In the future such methods might have other use cases
as well. So alloc_gigantic_page() has been split carving out actual
memory allocation method and made available via new
alloc_gigantic_page_order().
Link: http://lkml.kernel.org/r/1570775142-31425-2-git-send-email-anshuman.khandual@xxxxxxx
Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Mark Brown <broonie@xxxxxxxxxx>
Cc: Steven Price <Steven.Price@xxxxxxx>
Cc: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Cc: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Sri Krishna chowdary <schowdary@xxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: Russell King - ARM Linux <linux@xxxxxxxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Vineet Gupta <vgupta@xxxxxxxxxxxx>
Cc: James Hogan <jhogan@xxxxxxxxxx>
Cc: Paul Burton <paul.burton@xxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: Kirill A. Shutemov <kirill@xxxxxxxxxxxxx>
Cc: Gerald Schaefer <gerald.schaefer@xxxxxxxxxx>
Cc: Christophe Leroy <christophe.leroy@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/hugetlb.h | 9 +++++++++
mm/hugetlb.c | 24 ++++++++++++++++++++++--
2 files changed, 31 insertions(+), 2 deletions(-)
--- a/include/linux/hugetlb.h~mm-hugetlb-make-alloc_gigantic_page-available-for-general-use
+++ a/include/linux/hugetlb.h
@@ -299,6 +299,9 @@ static inline bool is_file_hugepages(str
}
+struct page *
+alloc_gigantic_page_order(unsigned int order, gfp_t gfp_mask,
+ int nid, nodemask_t *nodemask);
#else /* !CONFIG_HUGETLBFS */
#define is_file_hugepages(file) false
@@ -310,6 +313,12 @@ hugetlb_file_setup(const char *name, siz
return ERR_PTR(-ENOSYS);
}
+static inline struct page *
+alloc_gigantic_page_order(unsigned int order, gfp_t gfp_mask,
+ int nid, nodemask_t *nodemask)
+{
+ return NULL;
+}
#endif /* !CONFIG_HUGETLBFS */
#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
--- a/mm/hugetlb.c~mm-hugetlb-make-alloc_gigantic_page-available-for-general-use
+++ a/mm/hugetlb.c
@@ -1112,10 +1112,9 @@ static bool zone_spans_last_pfn(const st
return zone_spans_pfn(zone, last_pfn);
}
-static struct page *alloc_gigantic_page(struct hstate *h, gfp_t gfp_mask,
+struct page *alloc_gigantic_page_order(unsigned int order, gfp_t gfp_mask,
int nid, nodemask_t *nodemask)
{
- unsigned int order = huge_page_order(h);
unsigned long nr_pages = 1 << order;
unsigned long ret, pfn, flags;
struct zonelist *zonelist;
@@ -1151,6 +1150,14 @@ static struct page *alloc_gigantic_page(
return NULL;
}
+static struct page *alloc_gigantic_page(struct hstate *h, gfp_t gfp_mask,
+ int nid, nodemask_t *nodemask)
+{
+ unsigned int order = huge_page_order(h);
+
+ return alloc_gigantic_page_order(order, gfp_mask, nid, nodemask);
+}
+
static void prep_new_huge_page(struct hstate *h, struct page *page, int nid);
static void prep_compound_gigantic_page(struct page *page, unsigned int order);
#else /* !CONFIG_CONTIG_ALLOC */
@@ -1159,6 +1166,12 @@ static struct page *alloc_gigantic_page(
{
return NULL;
}
+
+struct page *alloc_gigantic_page_order(unsigned int order, gfp_t gfp_mask,
+ int nid, nodemask_t *nodemask)
+{
+ return NULL;
+}
#endif /* CONFIG_CONTIG_ALLOC */
#else /* !CONFIG_ARCH_HAS_GIGANTIC_PAGE */
@@ -1167,6 +1180,13 @@ static struct page *alloc_gigantic_page(
{
return NULL;
}
+
+struct page *alloc_gigantic_page_order(unsigned int order, gfp_t gfp_mask,
+ int nid, nodemask_t *nodemask)
+{
+ return NULL;
+}
+
static inline void free_gigantic_page(struct page *page, unsigned int order) { }
static inline void destroy_compound_gigantic_page(struct page *page,
unsigned int order) { }
_
Patches currently in -mm which might be from anshuman.khandual@xxxxxxx are
mm-hugetlb-make-alloc_gigantic_page-available-for-general-use.patch
mm-debug-add-tests-validating-architecture-page-table-helpers.patch
mm-hotplug-reorder-memblock_-calls-in-try_remove_memory.patch
