linux-kernel - [PATCH v1 0/7] selftests/vm: test COW handling of anonymous memory

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Date:   Tue, 27 Sep 2022 13:01:13 +0200
From:   David Hildenbrand <david@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
        David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>,
        Jason Gunthorpe <jgg@...dia.com>,
        John Hubbard <jhubbard@...dia.com>,
        Nadav Amit <namit@...are.com>, Peter Xu <peterx@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mike Rapoport <rppt@...nel.org>,
        Christoph von Recklinghausen <crecklin@...hat.com>,
        Don Dutile <ddutile@...hat.com>
Subject: [PATCH v1 0/7] selftests/vm: test COW handling of anonymous memory

On top of mm-stable.

This is my current set of tests for testing COW handling of anonymous
memory, especially when interacting with GUP. I developed these tests
while working on PageAnonExclusive and managed to clean them up just now.

On current upstream Linux, all tests pass except the hugetlb tests that
rely on vmsplice -- these tests should pass as soon as vmsplice properly
uses FOLL_PIN instead of FOLL_GET.

I'm working on additional tests for COW handling in private mappings,
focusing on long-term R/O pinning e.g., of the shared zeropage, pagecache
pages and KSM pages. These tests, however, will go into a different file.
So this is everything I have regarding tests for anonymous memory.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Shuah Khan <shuah@...nel.org>
Cc: Jason Gunthorpe <jgg@...dia.com>
Cc: John Hubbard <jhubbard@...dia.com>
Cc: Nadav Amit <namit@...are.com>
Cc: Peter Xu <peterx@...hat.com>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: Vlastimil Babka <vbabka@...e.cz>
Cc: Mike Rapoport <rppt@...nel.org>
Cc: Christoph von Recklinghausen <crecklin@...hat.com>
Cc: Don Dutile <ddutile@...hat.com>

David Hildenbrand (7):
  selftests/vm: anon_cow: test COW handling of anonymous memory
  selftests/vm: factor out pagemap_is_populated() into vm_util
  selftests/vm: anon_cow: THP tests
  selftests/vm: anon_cow: hugetlb tests
  selftests/vm: anon_cow: add liburing test cases
  mm/gup_test: start/stop/read functionality for PIN LONGTERM test
  selftests/vm: anon_cow: add R/O longterm tests via gup_test

 mm/gup_test.c                              |  140 +++
 mm/gup_test.h                              |   12 +
 tools/testing/selftests/vm/.gitignore      |    1 +
 tools/testing/selftests/vm/Makefile        |   25 +-
 tools/testing/selftests/vm/anon_cow.c      | 1126 ++++++++++++++++++++
 tools/testing/selftests/vm/check_config.sh |   31 +
 tools/testing/selftests/vm/madv_populate.c |    8 -
 tools/testing/selftests/vm/run_vmtests.sh  |    3 +
 tools/testing/selftests/vm/vm_util.c       |   15 +
 tools/testing/selftests/vm/vm_util.h       |    2 +
 10 files changed, 1353 insertions(+), 10 deletions(-)
 create mode 100644 tools/testing/selftests/vm/anon_cow.c
 create mode 100644 tools/testing/selftests/vm/check_config.sh

-- 
2.37.3