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From: Gavin Shan <gshan@redhat.com>
To: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org, anshuman.khandual@arm.com,
	catalin.marinas@arm.com, will@kernel.org,
	akpm@linux-foundation.org, shan.gavin@gmail.com,
	chuhu@redhat.com
Subject: [PATCH 00/12] mm/debug_vm_pgtable: Enhancements
Date: Tue,  6 Jul 2021 14:17:36 +0800	[thread overview]
Message-ID: <20210706061748.161258-1-gshan@redhat.com> (raw)

There are couple of issues with current implementations and this series
tries to resolve the issues:

  (a) All needed information are scattered in variables, passed to various
      test functions. The code is organized in pretty much relaxed fashion.

  (b) The page isn't allocated from buddy during page table entry modifying
      tests. The page can be invalid, conflicting to the implementations
      of set_{pud, pmd, pte}_at() on ARM64. The target page is accessed
      so that the iCache can be flushed when execution permission is given
      on ARM64. Besides, the target page can be unmapped and access to
      it causes kernel crash.

"struct vm_pgtable_debug" is introduced to address issue (a). For issue
(b), the used page is allocated from buddy in page table entry modifying
tests. The corresponding tets will be skipped if we fail to allocate the
(huge) page. For other test cases, the original page around to kernel
symbol (@start_kernel) is still used.

The patches are organized as below. PATCH[2-10] could be combined to one
patch, but it will make the review harder:

  PATCH[1] introduces "struct vm_pgtable_debug" as place holder of all
           needed information. With it, the old and new implementation
           can coexist.
  PATCH[2-10] uses "struct vm_pgtable_debug" in various test functions.
  PATCH[11] removes the old implementation.
  PATCH[12] fixes the issue of corrupted page flag for ARM64


Gavin Shan (12):
  mm/debug_vm_pgtable: Introduce struct vm_pgtable_debug
  mm/debug_vm_pgtable: Use struct vm_pgtable_debug in basic tests
  mm/debug_vm_pgtable: Use struct vm_pgtable_debug in leaf and savewrite
    tests
  mm/debug_vm_pgtable: Use struct vm_pgtable_debug in protnone and
    devmap tests
  mm/vm_debug_pgtable: Use struct vm_pgtable_debug in soft_dirty and
    swap tests
  mm/debug_vm_pgtable: Use struct vm_pgtable_debug in migration and thp
    tests
  mm/debug_vm_pgtable: Use struct vm_pgtable_debug in PTE modifying
    tests
  mm/debug_vm_pgtable: Use struct vm_pgtable_debug in PMD modifying
    tests
  mm/vm_debug_pgtable: Use struct vm_pgtable_debug in PUD modifying
    tests
  mm/debug_vm_pgtable: Use struct vm_pgtable_debug in PGD and P4D
    modifying tests
  mm/debug_vm_pgtable: Remove unused code
  mm/debug_vm_pgtable: Fix corrupted page flag

 mm/debug_vm_pgtable.c | 875 ++++++++++++++++++++++++------------------
 1 file changed, 500 insertions(+), 375 deletions(-)

-- 
2.23.0


             reply	other threads:[~2021-07-06  6:18 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-06  6:17 Gavin Shan [this message]
2021-07-06  6:17 ` [PATCH 01/12] mm/debug_vm_pgtable: Introduce struct vm_pgtable_debug Gavin Shan
2021-07-14  6:24   ` Anshuman Khandual
2021-07-19  5:39     ` Gavin Shan
2021-07-20  7:02       ` Anshuman Khandual
2021-07-20 23:07         ` Gavin Shan
2021-07-21  4:20           ` Anshuman Khandual
2021-07-06  6:17 ` [PATCH 02/12] mm/debug_vm_pgtable: Use struct vm_pgtable_debug in basic tests Gavin Shan
2021-07-06  6:17 ` [PATCH 03/12] mm/debug_vm_pgtable: Use struct vm_pgtable_debug in leaf and savewrite tests Gavin Shan
2021-07-06  6:17 ` [PATCH 04/12] mm/debug_vm_pgtable: Use struct vm_pgtable_debug in protnone and devmap tests Gavin Shan
2021-07-06  6:17 ` [PATCH 05/12] mm/vm_debug_pgtable: Use struct vm_pgtable_debug in soft_dirty and swap tests Gavin Shan
2021-07-06  6:17 ` [PATCH 06/12] mm/debug_vm_pgtable: Use struct vm_pgtable_debug in migration and thp tests Gavin Shan
2021-07-06  6:17 ` [PATCH 07/12] mm/debug_vm_pgtable: Use struct vm_pgtable_debug in PTE modifying tests Gavin Shan
2021-07-06  6:17 ` [PATCH 08/12] mm/debug_vm_pgtable: Use struct vm_pgtable_debug in PMD " Gavin Shan
2021-07-06  6:17 ` [PATCH 09/12] mm/vm_debug_pgtable: Use struct vm_pgtable_debug in PUD " Gavin Shan
2021-07-06  6:17 ` [PATCH 10/12] mm/debug_vm_pgtable: Use struct vm_pgtable_debug in PGD and P4D " Gavin Shan
2021-07-06  6:17 ` [PATCH 11/12] mm/debug_vm_pgtable: Remove unused code Gavin Shan
2021-07-06  6:17 ` [PATCH 12/12] mm/debug_vm_pgtable: Fix corrupted page flag Gavin Shan
2021-07-12  4:14 ` [PATCH 00/12] mm/debug_vm_pgtable: Enhancements Anshuman Khandual
2021-07-13  1:20   ` Gavin Shan
2021-07-14  5:26     ` Anshuman Khandual
2021-07-15  5:17       ` Gavin Shan
2021-07-18  6:36         ` Anshuman Khandual

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