[PATCH 0/8] selftests/vm: gup_test, hmm-tests, assorted improvements

John Hubbard
2020-09-28T06:21:51Z

This is based on the latest mmotm.

Summary: This series provides two main things, and a number of smaller
supporting goodies. The two main points are:

1) Add a new sub-test to gup_test, which in turn is a renamed version of
gup_benchmark. This sub-test allows nicer testing of dump_pages(), at
least on user-space pages.

For quite a while, I was doing a quick hack to gup_test.c whenever I
wanted to try out changes to dump_page(). Then Matthew Wilcox asked me
what I meant when I said "I used my dump_page() unit test", and I
realized that it might be nice to check in a polished up version of
that.

Details about how it works and how to use it are in the commit
description for patch #6.

2) Fixes a limitation of hmm-tests: these tests are incredibly useful,
but only if people actually build and run them. And it turns out that
libhugetlbfs is a little too effective at throwing a wrench in the
works, there. So I've added a little configuration check that removes
just two of the 21 hmm-tests, if libhugetlbfs is not available.

Further details in the commit description of patch #8.

Other smaller things that this series does:

a) Remove code duplication by creating gup_test.h.

b) Clear up the sub-test organization, and their invocation within
run_vmtests.sh.

c) Other minor assorted improvements.

John Hubbard (8):
mm/gup_benchmark: rename to mm/gup_test
selftests/vm: use a common gup_test.h
selftests/vm: rename run_vmtests --> run_vmtests.sh
selftests/vm: minor cleanup: Makefile and gup_test.c
selftests/vm: only some gup_test items are really benchmarks
selftests/vm: gup_test: introduce the dump_pages() sub-test
selftests/vm: run_vmtest.sh: update and clean up gup_test invocation
selftests/vm: hmm-tests: remove the libhugetlbfs dependency

Documentation/core-api/pin_user_pages.rst | 6 +-
arch/s390/configs/debug_defconfig | 2 +-
arch/s390/configs/defconfig | 2 +-
mm/Kconfig | 21 +-
mm/Makefile | 2 +-
mm/{gup_benchmark.c => gup_test.c} | 109 ++++++----
mm/gup_test.h | 32 +++
tools/testing/selftests/vm/.gitignore | 3 +-
tools/testing/selftests/vm/Makefile | 38 +++-
tools/testing/selftests/vm/check_config.sh | 30 +++
tools/testing/selftests/vm/config | 2 +-
tools/testing/selftests/vm/gup_benchmark.c | 137 -------------
tools/testing/selftests/vm/gup_test.c | 188 ++++++++++++++++++
tools/testing/selftests/vm/hmm-tests.c | 10 +-
.../vm/{run_vmtests => run_vmtest.sh} | 24 ++-
15 files changed, 403 insertions(+), 203 deletions(-)
rename mm/{gup_benchmark.c => gup_test.c} (59%)
create mode 100644 mm/gup_test.h
create mode 100755 tools/testing/selftests/vm/check_config.sh
delete mode 100644 tools/testing/selftests/vm/gup_benchmark.c
create mode 100644 tools/testing/selftests/vm/gup_test.c
rename tools/testing/selftests/vm/{run_vmtests => run_vmtest.sh} (91%)

--
2.28.0