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From: yulei.kernel@gmail.com
To: akpm@linux-foundation.org, naoya.horiguchi@nec.com,
	viro@zeniv.linux.org.uk, pbonzini@redhat.com
Cc: linux-fsdevel@vger.kernel.org, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org, xiaoguangrong.eric@gmail.com,
	kernellwp@gmail.com, lihaiwei.kernel@gmail.com,
	Yulei Zhang <yuleixzhang@tencent.com>,
	Chen Zhuo <sagazchen@tencent.com>
Subject: [PATCH 21/35] mm: support dmem huge pmd for follow_pfn()
Date: Thu,  8 Oct 2020 15:54:11 +0800	[thread overview]
Message-ID: <5c508795a2f262e80cc3855853eba4042c863a3f.1602093760.git.yuleixzhang@tencent.com> (raw)
In-Reply-To: <cover.1602093760.git.yuleixzhang@tencent.com>
In-Reply-To: <cover.1602093760.git.yuleixzhang@tencent.com>

From: Yulei Zhang <yuleixzhang@tencent.com>

follow_pfn() will get pfn of pmd if huge pmd is encountered.

Signed-off-by: Chen Zhuo <sagazchen@tencent.com>
Signed-off-by: Yulei Zhang <yuleixzhang@tencent.com>
---
 mm/memory.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index 2d2c0f8a966b..ca42a6e56e9b 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4644,15 +4644,23 @@ int follow_pfn(struct vm_area_struct *vma, unsigned long address,
 	int ret = -EINVAL;
 	spinlock_t *ptl;
 	pte_t *ptep;
+	pmd_t *pmdp = NULL;
 
 	if (!(vma->vm_flags & (VM_IO | VM_PFNMAP)))
 		return ret;
 
-	ret = follow_pte(vma->vm_mm, address, &ptep, &ptl);
+	ret = follow_pte_pmd(vma->vm_mm, address, NULL, &ptep, &pmdp, &ptl);
 	if (ret)
 		return ret;
-	*pfn = pte_pfn(*ptep);
-	pte_unmap_unlock(ptep, ptl);
+
+	if (pmdp) {
+		*pfn = pmd_pfn(*pmdp) + ((address & ~PMD_MASK) >> PAGE_SHIFT);
+		spin_unlock(ptl);
+	} else {
+		*pfn = pte_pfn(*ptep);
+		pte_unmap_unlock(ptep, ptl);
+	}
+
 	return 0;
 }
 EXPORT_SYMBOL(follow_pfn);
-- 
2.28.0


  parent reply	other threads:[~2020-10-08  7:57 UTC|newest]

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-08  7:53 [PATCH 00/35] Enhance memory utilization with DMEMFS yulei.kernel
2020-10-08  7:53 ` [PATCH 01/35] fs: introduce dmemfs module yulei.kernel
2020-11-10 20:04   ` Al Viro
2020-11-11  8:53     ` yulei zhang
2020-11-11 23:09       ` Al Viro
2020-11-12 10:03         ` yulei zhang
2020-10-08  7:53 ` [PATCH 02/35] mm: support direct memory reservation yulei.kernel
2020-10-08 20:27   ` Randy Dunlap
2020-10-08 20:34   ` Randy Dunlap
2020-10-08  7:53 ` [PATCH 03/35] dmem: implement dmem memory management yulei.kernel
2020-10-08  7:53 ` [PATCH 04/35] dmem: let pat recognize dmem yulei.kernel
2020-10-13  7:27   ` Paolo Bonzini
2020-10-13  9:53     ` yulei zhang
2020-10-08  7:53 ` [PATCH 05/35] dmemfs: support mmap yulei.kernel
2020-10-08  7:53 ` [PATCH 06/35] dmemfs: support truncating inode down yulei.kernel
2020-10-08  7:53 ` [PATCH 07/35] dmem: trace core functions yulei.kernel
2020-10-08  7:53 ` [PATCH 08/35] dmem: show some statistic in debugfs yulei.kernel
2020-10-08 20:23   ` Randy Dunlap
2020-10-09 11:49     ` yulei zhang
2020-10-08  7:53 ` [PATCH 09/35] dmemfs: support remote access yulei.kernel
2020-10-08  7:54 ` [PATCH 10/35] dmemfs: introduce max_alloc_try_dpages parameter yulei.kernel
2020-10-08  7:54 ` [PATCH 11/35] mm: export mempolicy interfaces to serve dmem allocator yulei.kernel
2020-10-08  7:54 ` [PATCH 12/35] dmem: introduce mempolicy support yulei.kernel
2020-10-08  7:54 ` [PATCH 13/35] mm, dmem: introduce PFN_DMEM and pfn_t_dmem yulei.kernel
2020-10-08  7:54 ` [PATCH 14/35] mm, dmem: dmem-pmd vs thp-pmd yulei.kernel
2020-10-08  7:54 ` [PATCH 15/35] mm: add pmd_special() check for pmd_trans_huge_lock() yulei.kernel
2020-10-08  7:54 ` [PATCH 16/35] dmemfs: introduce ->split() to dmemfs_vm_ops yulei.kernel
2020-10-08  7:54 ` [PATCH 17/35] mm, dmemfs: support unmap_page_range() for dmemfs pmd yulei.kernel
2020-10-08  7:54 ` [PATCH 18/35] mm: follow_pmd_mask() for dmem huge pmd yulei.kernel
2020-10-08  7:54 ` [PATCH 19/35] mm: gup_huge_pmd() " yulei.kernel
2020-10-08  7:54 ` [PATCH 20/35] mm: support dmem huge pmd for vmf_insert_pfn_pmd() yulei.kernel
2020-10-08  7:54 ` yulei.kernel [this message]
2020-10-08  7:54 ` [PATCH 22/35] kvm, x86: Distinguish dmemfs page from mmio page yulei.kernel
2020-10-09  0:58   ` Sean Christopherson
2020-10-09 10:28     ` Joao Martins
2020-10-09 11:42       ` yulei zhang
2020-10-08  7:54 ` [PATCH 23/35] kvm, x86: introduce VM_DMEM yulei.kernel
2020-10-08  7:54 ` [PATCH 24/35] dmemfs: support hugepage for dmemfs yulei.kernel
2020-10-08  7:54 ` [PATCH 25/35] mm, x86, dmem: fix estimation of reserved page for vaddr_get_pfn() yulei.kernel
2020-10-08  7:54 ` [PATCH 26/35] mm, dmem: introduce pud_special() yulei.kernel
2020-10-08  7:54 ` [PATCH 27/35] mm: add pud_special() to support dmem huge pud yulei.kernel
2020-10-08  7:54 ` [PATCH 28/35] mm, dmemfs: support huge_fault() for dmemfs yulei.kernel
2020-10-08  7:54 ` [PATCH 29/35] mm: add follow_pte_pud() yulei.kernel
2020-10-08  7:54 ` [PATCH 30/35] dmem: introduce dmem_bitmap_alloc() and dmem_bitmap_free() yulei.kernel
2020-10-08  7:54 ` [PATCH 31/35] dmem: introduce mce handler yulei.kernel
2020-10-08  7:54 ` [PATCH 32/35] mm, dmemfs: register and handle the dmem mce yulei.kernel
2020-10-08  7:54 ` [PATCH 33/35] kvm, x86: temporary disable record_steal_time for dmem yulei.kernel
2020-10-08  7:54 ` [PATCH 34/35] dmem: add dmem unit tests yulei.kernel
2020-10-08  7:54 ` [PATCH 35/35] Add documentation for dmemfs yulei.kernel
2020-10-09  1:26   ` Randy Dunlap
2020-10-08 19:01 ` [PATCH 00/35] Enhance memory utilization with DMEMFS Joao Martins
2020-10-09 11:39   ` yulei zhang
2020-10-09 11:53     ` Joao Martins
2020-10-10  8:15       ` yulei zhang
2020-10-12 10:59         ` Joao Martins
2020-10-14 22:25           ` Dan Williams
2020-10-19 13:37             ` Paolo Bonzini
2020-10-19 19:03               ` Joao Martins
2020-10-20 15:22                 ` yulei zhang
2020-10-12 11:57 ` Zengtao (B)
2020-10-13  2:45   ` yulei zhang

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