linux-kernel - [PATCH v3 4/6] mm/thp: add THP allocation helper

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Message-ID: <20201106005147.20113-5-rcampbell@nvidia.com>
Date:   Thu, 5 Nov 2020 16:51:45 -0800
From:   Ralph Campbell <rcampbell@...dia.com>
To:     <linux-mm@...ck.org>, <nouveau@...ts.freedesktop.org>,
        <linux-kselftest@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     Jerome Glisse <jglisse@...hat.com>,
        John Hubbard <jhubbard@...dia.com>,
        Alistair Popple <apopple@...dia.com>,
        Christoph Hellwig <hch@....de>,
        "Jason Gunthorpe" <jgg@...dia.com>,
        Bharata B Rao <bharata@...ux.ibm.com>,
        Zi Yan <ziy@...dia.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        Ben Skeggs <bskeggs@...hat.com>, Shuah Khan <shuah@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ralph Campbell <rcampbell@...dia.com>
Subject: [PATCH v3 4/6] mm/thp: add THP allocation helper

Transparent huge page allocation policy is controlled by several sysfs
variables. Rather than expose these to each device driver that needs to
allocate THPs, provide a helper function.

Signed-off-by: Ralph Campbell <rcampbell@...dia.com>
---
 include/linux/gfp.h | 10 ++++++++++
 mm/huge_memory.c    | 14 ++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index c603237e006c..242398c4b556 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -564,6 +564,16 @@ static inline struct page *alloc_pages(gfp_t gfp_mask, unsigned int order)
 #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
 #define alloc_page_vma(gfp_mask, vma, addr)			\
 	alloc_pages_vma(gfp_mask, 0, vma, addr, numa_node_id(), false)
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+extern struct page *alloc_transhugepage(struct vm_area_struct *vma,
+					unsigned long addr);
+#else
+static inline struct page *alloc_transhugepage(struct vm_area_struct *vma,
+						unsigned long addr)
+{
+	return NULL;
+}
+#endif
 
 extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order);
 extern unsigned long get_zeroed_page(gfp_t gfp_mask);
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index a073e66d0ee2..c2c1d3e7c35f 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -765,6 +765,20 @@ vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf)
 	return __do_huge_pmd_anonymous_page(vmf, page, gfp);
 }
 
+struct page *alloc_transhugepage(struct vm_area_struct *vma,
+				 unsigned long haddr)
+{
+	gfp_t gfp;
+	struct page *page;
+
+	gfp = alloc_hugepage_direct_gfpmask(vma);
+	page = alloc_hugepage_vma(gfp, vma, haddr, HPAGE_PMD_ORDER);
+	if (page)
+		prep_transhuge_page(page);
+	return page;
+}
+EXPORT_SYMBOL_GPL(alloc_transhugepage);
+
 static void insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr,
 		pmd_t *pmd, pfn_t pfn, pgprot_t prot, bool write,
 		pgtable_t pgtable)
-- 
2.20.1