linux-toradex.git/tools/testing/selftests/vm, branch v5.7-rc2

userfaultfd: selftests: add write-protect test

2020-04-07T17:43:40+00:00

Add uffd tests for write protection.

Instead of introducing new tests for it, let's simply squashing uffd-wp
tests into existing uffd-missing test cases.  Changes are:

(1) Bouncing tests

  We do the write-protection in two ways during the bouncing test:

  - By using UFFDIO_COPY_MODE_WP when resolving MISSING pages: then
    we'll make sure for each bounce process every single page will be
    at least fault twice: once for MISSING, once for WP.

  - By direct call UFFDIO_WRITEPROTECT on existing faulted memories:
    To further torture the explicit page protection procedures of
    uffd-wp, we split each bounce procedure into two halves (in the
    background thread): the first half will be MISSING+WP for each
    page as explained above.  After the first half, we write protect
    the faulted region in the background thread to make sure at least
    half of the pages will be write protected again which is the first
    half to test the new UFFDIO_WRITEPROTECT call.  Then we continue
    with the 2nd half, which will contain both MISSING and WP faulting
    tests for the 2nd half and WP-only faults from the 1st half.

(2) Event/Signal test

  Mostly previous tests but will do MISSING+WP for each page.  For
  sigbus-mode test we'll need to provide standalone path to handle the
  write protection faults.

For all tests, do statistics as well for uffd-wp pages.

Signed-off-by: Peter Xu 
Signed-off-by: Andrew Morton 
Cc: Andrea Arcangeli 
Cc: Bobby Powers 
Cc: Brian Geffon 
Cc: David Hildenbrand 
Cc: Denis Plotnikov 
Cc: "Dr . David Alan Gilbert" 
Cc: Hugh Dickins 
Cc: Jerome Glisse 
Cc: Johannes Weiner 
Cc: "Kirill A . Shutemov" 
Cc: Martin Cracauer 
Cc: Marty McFadden 
Cc: Maya Gokhale 
Cc: Mel Gorman 
Cc: Mike Kravetz 
Cc: Mike Rapoport 
Cc: Pavel Emelyanov 
Cc: Rik van Riel 
Cc: Shaohua Li 
Link: http://lkml.kernel.org/r/20200220163112.11409-20-peterx@redhat.com
Signed-off-by: Linus Torvalds

userfaultfd: selftests: refactor statistics

2020-04-07T17:43:40+00:00

Introduce uffd_stats structure for statistics of the self test, at the
same time refactor the code to always pass in the uffd_stats for either
read() or poll() typed fault handling threads instead of using two
different ways to return the statistic results.  No functional change.

With the new structure, it's very easy to introduce new statistics.

Signed-off-by: Peter Xu 
Signed-off-by: Andrew Morton 
Reviewed-by: Mike Rapoport 
Cc: Andrea Arcangeli 
Cc: Bobby Powers 
Cc: Brian Geffon 
Cc: David Hildenbrand 
Cc: Denis Plotnikov 
Cc: "Dr . David Alan Gilbert" 
Cc: Hugh Dickins 
Cc: Jerome Glisse 
Cc: Johannes Weiner 
Cc: "Kirill A . Shutemov" 
Cc: Martin Cracauer 
Cc: Marty McFadden 
Cc: Maya Gokhale 
Cc: Mel Gorman 
Cc: Mike Kravetz 
Cc: Pavel Emelyanov 
Cc: Rik van Riel 
Cc: Shaohua Li 
Link: http://lkml.kernel.org/r/20200220163112.11409-19-peterx@redhat.com
Signed-off-by: Linus Torvalds

Merge tag 'spdx-5.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/spdx

2020-04-03T20:12:26+00:00

Pull SPDX updates from Greg KH:
 "Here are three SPDX patches for 5.7-rc1.

  One fixes up the SPDX tag for a single driver, while the other two go
  through the tree and add SPDX tags for all of the .gitignore files as
  needed.

  Nothing too complex, but you will get a merge conflict with your
  current tree, that should be trivial to handle (one file modified by
  two things, one file deleted.)

  All three of these have been in linux-next for a while, with no
  reported issues other than the merge conflict"

* tag 'spdx-5.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/spdx:
  ASoC: MT6660: make spdxcheck.py happy
  .gitignore: add SPDX License Identifier
  .gitignore: remove too obvious comments

selftests/vm: fix map_hugetlb length used for testing read and write

2020-04-02T16:35:32+00:00

Commit fa7b9a805c79 ("tools/selftest/vm: allow choosing mem size and page
size in map_hugetlb") added the possibility to change the size of memory
mapped for the test, but left the read and write test using the default
value.  This is unnoticed when mapping a length greater than the default
one, but segfaults otherwise.

Fix read_bytes() and write_bytes() by giving them the real length.

Also fix the call to munmap().

Fixes: fa7b9a805c79 ("tools/selftest/vm: allow choosing mem size and page size in map_hugetlb")
Signed-off-by: Christophe Leroy 
Signed-off-by: Andrew Morton 
Reviewed-by: Leonardo Bras 
Cc: Michael Ellerman 
Cc: Shuah Khan 
Cc: 
Link: http://lkml.kernel.org/r/9a404a13c871c4bd0ba9ede68f69a1225180dd7e.1580978385.git.christophe.leroy@c-s.fr
Signed-off-by: Linus Torvalds

hugetlb_cgroup: add hugetlb_cgroup reservation tests

2020-04-02T16:35:32+00:00

The tests use both shared and private mapped hugetlb memory, and monitors
the hugetlb usage counter as well as the hugetlb reservation counter.
They test different configurations such as hugetlb memory usage via
hugetlbfs, or MAP_HUGETLB, or shmget/shmat, and with and without
MAP_POPULATE.

Also add test for hugetlb reservation reparenting, since this is a subtle
issue.

Signed-off-by: Mina Almasry 
Signed-off-by: Andrew Morton 
Tested-by: Sandipan Das 	[powerpc64]
Acked-by: Mike Kravetz 
Cc: Sandipan Das 
Cc: David Rientjes 
Cc: Greg Thelen 
Cc: Shakeel Butt 
Cc: Shuah Khan 
Link: http://lkml.kernel.org/r/20200211213128.73302-8-almasrymina@google.com
Signed-off-by: Linus Torvalds

selftests: vm: drop dependencies on page flags from mlock2 tests

2020-04-02T16:35:31+00:00

It was noticed that mlock2 tests are failing after 9c4e6b1a7027f ("mm,
mlock, vmscan: no more skipping pagevecs") because the patch has changed
the timing on when the page is added to the unevictable LRU list and thus
gains the unevictable page flag.

The test was just too dependent on the implementation details which were
true at the time when it was introduced.  Page flags and the timing when
they are set is something no userspace should ever depend on.  The test
should be testing only for the user observable contract of the tested
syscalls.  Those are defined pretty well for the mlock and there are other
means for testing them.  In fact this is already done and testing for page
flags can be safely dropped to achieve the aimed purpose.  Present bits
can be checked by /proc//smaps RSS field and the locking state by
VmFlags although I would argue that Locked: field would be more
appropriate.

Drop all the page flag machinery and considerably simplify the test.  This
should be more robust for future kernel changes while checking the
promised contract is still valid.

Fixes: 9c4e6b1a7027f ("mm, mlock, vmscan: no more skipping pagevecs")
Reported-by: Rafael Aquini 
Signed-off-by: Michal Hocko 
Signed-off-by: Andrew Morton 
Acked-by: Rafael Aquini 
Cc: Shakeel Butt 
Cc: Eric B Munson 
Cc: Shuah Khan 
Cc: 
Link: http://lkml.kernel.org/r/20200324154218.GS19542@dhcp22.suse.cz
Signed-off-by: Linus Torvalds

selftests: add MREMAP_DONTUNMAP selftest

2020-04-02T16:35:30+00:00

Add a few simple self tests for the new flag MREMAP_DONTUNMAP, they are
simple smoke tests which also demonstrate the behavior.

[akpm@linux-foundation.org: convert eight-spaces to hard tabs]
[bgeffon@google.com: v7]
  Link: http://lkml.kernel.org/r/20200221174248.244748-2-bgeffon@google.com
[akpm@linux-foundation.org: coding style fixes]
Signed-off-by: Brian Geffon 
Signed-off-by: Andrew Morton 
Cc: Vlastimil Babka 
Cc: "Michael S . Tsirkin" 
Cc: Brian Geffon 
Cc: Arnd Bergmann 
Cc: Andy Lutomirski 
Cc: Will Deacon 
Cc: Andrea Arcangeli 
Cc: Sonny Rao 
Cc: Minchan Kim 
Cc: Joel Fernandes 
Cc: Yu Zhao 
Cc: Jesse Barnes 
Cc: Nathan Chancellor 
Cc: Florian Weimer 
Cc: "Kirill A . Shutemov" 
Cc: Lokesh Gidra 
Link: http://lkml.kernel.org/r/20200218173221.237674-2-bgeffon@google.com
Signed-off-by: Linus Torvalds

selftests/vm: run_vmtests: invoke gup_benchmark with basic FOLL_PIN coverage

2020-04-02T16:35:27+00:00

It's good to have basic unit test coverage of the new FOLL_PIN behavior.
Fortunately, the gup_benchmark unit test is extremely fast (a few
milliseconds), so adding it the the run_vmtests suite is going to cause no
noticeable change in running time.

So, add two new invocations to run_vmtests:

1) Run gup_benchmark with normal get_user_pages().

2) Run gup_benchmark with pin_user_pages().  This is much like the
   first call, except that it sets FOLL_PIN.

Running these two in quick succession also provide a visual comparison of
the running times, which is convenient.

The new invocations are fairly early in the run_vmtests script, because
with test suites, it's usually preferable to put the shorter, faster tests
first, all other things being equal.

Signed-off-by: John Hubbard 
Signed-off-by: Andrew Morton 
Reviewed-by: Ira Weiny 
Cc: Jan Kara 
Cc: Jérôme Glisse 
Cc: Kirill A. Shutemov 
Cc: "Matthew Wilcox (Oracle)" 
Cc: Al Viro 
Cc: Christoph Hellwig 
Cc: Dan Williams 
Cc: Dave Chinner 
Cc: Jason Gunthorpe 
Cc: Jonathan Corbet 
Cc: Michal Hocko 
Cc: Mike Kravetz 
Cc: Shuah Khan 
Cc: Vlastimil Babka 
Link: http://lkml.kernel.org/r/20200211001536.1027652-11-jhubbard@nvidia.com
Signed-off-by: Linus Torvalds

mm/gup_benchmark: support pin_user_pages() and related calls

2020-04-02T16:35:27+00:00

Up until now, gup_benchmark supported testing of the following kernel
functions:

* get_user_pages(): via the '-U' command line option
* get_user_pages_longterm(): via the '-L' command line option
* get_user_pages_fast(): as the default (no options required)

Add test coverage for the new corresponding pin_*() functions:

* pin_user_pages_fast(): via the '-a' command line option
* pin_user_pages():      via the '-b' command line option

Also, add an option for clarity: '-u' for what is now (still) the default
choice: get_user_pages_fast().

Also, for the commands that set FOLL_PIN, verify that the pages really are
dma-pinned, via the new is_dma_pinned() routine.  Those commands are:

    PIN_FAST_BENCHMARK     : calls pin_user_pages_fast()
    PIN_BENCHMARK          : calls pin_user_pages()

In between the calls to pin_*() and unpin_user_pages(), check each page:
if page_maybe_dma_pinned() returns false, then WARN and return.

Do this outside of the benchmark timestamps, so that it doesn't affect
reported times.

Signed-off-by: John Hubbard 
Signed-off-by: Andrew Morton 
Reviewed-by: Ira Weiny 
Acked-by: Kirill A. Shutemov 
Cc: Jan Kara 
Cc: Jérôme Glisse 
Cc: "Matthew Wilcox (Oracle)" 
Cc: Al Viro 
Cc: Christoph Hellwig 
Cc: Dan Williams 
Cc: Dave Chinner 
Cc: Jason Gunthorpe 
Cc: Jonathan Corbet 
Cc: Michal Hocko 
Cc: Mike Kravetz 
Cc: Shuah Khan 
Cc: Vlastimil Babka 
Link: http://lkml.kernel.org/r/20200211001536.1027652-10-jhubbard@nvidia.com
Signed-off-by: Linus Torvalds

.gitignore: add SPDX License Identifier

2020-03-25T10:50:48+00:00

Add SPDX License Identifier to all .gitignore files.

Signed-off-by: Masahiro Yamada 
Signed-off-by: Greg Kroah-Hartman