linux-kernel - [RFC PATCH v2 30/30] mm: thp: enable anonymous PUD THP at page fault path.

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Message-Id: <20200928175428.4110504-31-zi.yan@sent.com>
Date:   Mon, 28 Sep 2020 13:54:28 -0400
From:   Zi Yan <zi.yan@...t.com>
To:     linux-mm@...ck.org
Cc:     "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Roman Gushchin <guro@...com>, Rik van Riel <riel@...riel.com>,
        Matthew Wilcox <willy@...radead.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Yang Shi <shy828301@...il.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Michal Hocko <mhocko@...e.com>,
        David Hildenbrand <david@...hat.com>,
        William Kucharski <william.kucharski@...cle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        John Hubbard <jhubbard@...dia.com>,
        David Nellans <dnellans@...dia.com>,
        linux-kernel@...r.kernel.org, Zi Yan <ziy@...dia.com>
Subject: [RFC PATCH v2 30/30] mm: thp: enable anonymous PUD THP at page fault path.

From: Zi Yan <ziy@...dia.com>

All previous commits have anonymous PUD THP support ready, so we can
enable anonymous PUD THP page fault now.

Signed-off-by: Zi Yan <ziy@...dia.com>
---
 mm/memory.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index 9f7b509a3aa7..dc285d9872fc 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4122,16 +4122,15 @@ static vm_fault_t create_huge_pud(struct vm_fault *vmf)
 {
 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) &&			\
 	defined(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD)
-	/* No support for anonymous transparent PUD pages yet */
 	if (vma_is_anonymous(vmf->vma))
-		goto split;
+		return do_huge_pud_anonymous_page(vmf);
 	if (vmf->vma->vm_ops->huge_fault) {
 		vm_fault_t ret = vmf->vma->vm_ops->huge_fault(vmf, PE_SIZE_PUD);
 
 		if (!(ret & VM_FAULT_FALLBACK))
 			return ret;
 	}
-split:
+
 	/* COW or write-notify not handled on PUD level: split pud.*/
 	__split_huge_pud(vmf->vma, vmf->pud, vmf->address, false, NULL);
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
-- 
2.28.0