From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ralph Campbell Subject: [PATCH v3 4/6] mm/thp: add THP allocation helper Date: Thu, 5 Nov 2020 16:51:45 -0800 Message-ID: <20201106005147.20113-5-rcampbell@nvidia.com> References: <20201106005147.20113-1-rcampbell@nvidia.com> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: <20201106005147.20113-1-rcampbell@nvidia.com> To: linux-mm@kvack.org, nouveau@lists.freedesktop.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Jerome Glisse , John Hubbard , Alistair Popple , Christoph Hellwig , Jason Gunthorpe , Bharata B Rao , Zi Yan , "Kirill A . Shutemov" , Yang Shi , Ben Skeggs , Shuah Khan , Andrew Morton , Ralph Campbell List-Id: nouveau.vger.kernel.org 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 --- 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 =20 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); } =20 +struct page *alloc_transhugepage(struct vm_area_struct *vma, + unsigned long haddr) +{ + gfp_t gfp; + struct page *page; + + gfp =3D alloc_hugepage_direct_gfpmask(vma); + page =3D 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) --=20 2.20.1