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Date: Fri, 11 Oct 2019 11:55:41 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: linux-mm@...ck.org
Cc: Anshuman Khandual <anshuman.khandual@....com>,
Andrew Morton <akpm@...ux-foundation.org>,
Vlastimil Babka <vbabka@...e.cz>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Thomas Gleixner <tglx@...utronix.de>,
Mike Rapoport <rppt@...ux.vnet.ibm.com>,
Mike Kravetz <mike.kravetz@...cle.com>,
Jason Gunthorpe <jgg@...pe.ca>,
Dan Williams <dan.j.williams@...el.com>,
Peter Zijlstra <peterz@...radead.org>,
Michal Hocko <mhocko@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Mark Brown <broonie@...nel.org>,
Steven Price <Steven.Price@....com>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Masahiro Yamada <yamada.masahiro@...ionext.com>,
Kees Cook <keescook@...omium.org>,
Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
Matthew Wilcox <willy@...radead.org>,
Sri Krishna chowdary <schowdary@...dia.com>,
Dave Hansen <dave.hansen@...el.com>,
Russell King - ARM Linux <linux@...linux.org.uk>,
Michael Ellerman <mpe@...erman.id.au>,
Paul Mackerras <paulus@...ba.org>,
Martin Schwidefsky <schwidefsky@...ibm.com>,
Heiko Carstens <heiko.carstens@...ibm.com>,
"David S. Miller" <davem@...emloft.net>,
Vineet Gupta <vgupta@...opsys.com>,
James Hogan <jhogan@...nel.org>,
Paul Burton <paul.burton@...s.com>,
Ralf Baechle <ralf@...ux-mips.org>,
"Kirill A . Shutemov" <kirill@...temov.name>,
Gerald Schaefer <gerald.schaefer@...ibm.com>,
Christophe Leroy <christophe.leroy@....fr>,
linux-snps-arc@...ts.infradead.org, linux-mips@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-ia64@...r.kernel.org,
linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [PATCH V5 1/2] mm/hugetlb: Make alloc_gigantic_page() available for general use
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().
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Vlastimil Babka <vbabka@...e.cz>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Mike Rapoport <rppt@...ux.vnet.ibm.com>
Cc: Mike Kravetz <mike.kravetz@...cle.com>
Cc: Jason Gunthorpe <jgg@...pe.ca>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Michal Hocko <mhocko@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Mark Brown <broonie@...nel.org>
Cc: Steven Price <Steven.Price@....com>
Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc: Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc: Matthew Wilcox <willy@...radead.org>
Cc: Sri Krishna chowdary <schowdary@...dia.com>
Cc: Dave Hansen <dave.hansen@...el.com>
Cc: Russell King - ARM Linux <linux@...linux.org.uk>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
Cc: Heiko Carstens <heiko.carstens@...ibm.com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Vineet Gupta <vgupta@...opsys.com>
Cc: James Hogan <jhogan@...nel.org>
Cc: Paul Burton <paul.burton@...s.com>
Cc: Ralf Baechle <ralf@...ux-mips.org>
Cc: Kirill A. Shutemov <kirill@...temov.name>
Cc: Gerald Schaefer <gerald.schaefer@...ibm.com>
Cc: Christophe Leroy <christophe.leroy@....fr>
Cc: linux-snps-arc@...ts.infradead.org
Cc: linux-mips@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-ia64@...r.kernel.org
Cc: linuxppc-dev@...ts.ozlabs.org
Cc: linux-s390@...r.kernel.org
Cc: linux-sh@...r.kernel.org
Cc: sparclinux@...r.kernel.org
Cc: x86@...nel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
include/linux/hugetlb.h | 9 +++++++++
mm/hugetlb.c | 24 ++++++++++++++++++++++--
2 files changed, 31 insertions(+), 2 deletions(-)
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 4c5a16b..7ff1e36 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -298,6 +298,9 @@ static inline bool is_file_hugepages(struct file *file)
}
+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
@@ -309,6 +312,12 @@ hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
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
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 977f9a3..2996e44 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1066,10 +1066,9 @@ static bool zone_spans_last_pfn(const struct zone *zone,
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;
@@ -1105,6 +1104,14 @@ static struct page *alloc_gigantic_page(struct hstate *h, gfp_t gfp_mask,
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 */
@@ -1113,6 +1120,12 @@ static struct page *alloc_gigantic_page(struct hstate *h, gfp_t gfp_mask,
{
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 */
@@ -1121,6 +1134,13 @@ static struct page *alloc_gigantic_page(struct hstate *h, gfp_t gfp_mask,
{
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) { }
--
2.7.4
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