Pavel Tatashin e44605a8b1 selftests/vm: gup_test: test faulting in kernel, and verify pinnable pages ...

When pages are pinned they can be faulted in userland and migrated, and
they can be faulted right in kernel without migration.

In either case, the pinned pages must end-up being pinnable (not
movable).

Add a new test to gup_test, to help verify that the gup/pup
(get_user_pages() / pin_user_pages()) behavior with respect to pinnable
and movable pages is reasonable and correct.  Specifically, provide a
way to:

1) Verify that only "pinnable" pages are pinned.  This is checked
   automatically for you.

2) Verify that gup/pup performance is reasonable.  This requires
   comparing benchmarks between doing gup/pup on pages that have been
   pre-faulted in from user space, vs.  doing gup/pup on pages that are
   not faulted in until gup/pup time (via FOLL_TOUCH).  This decision is
   controlled with the new -z command line option.

Link: https://lkml.kernel.org/r/20210215161349.246722-15-pasha.tatashin@soleen.com
Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: James Morris <jmorris@namei.org>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sasha Levin <sashal@kernel.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Tyler Hicks <tyhicks@linux.microsoft.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2021-05-05 11:27:26 -07:00

..

.gitignore

mm: huge_memory: a new debugfs interface for splitting THP tests

2021-05-05 11:27:21 -07:00

charge_reserved_hugetlb.sh

hugetlb_cgroup: add hugetlb_cgroup reservation tests

2020-04-02 09:35:32 -07:00

check_config.sh

selftests/vm: hmm-tests: remove the libhugetlbfs dependency

2020-12-15 12:13:38 -08:00

compaction_test.c

selftests/vm: 8x compaction_test speedup

2020-10-13 18:38:34 -07:00

config

mm/gup_benchmark: rename to mm/gup_test

2020-12-15 12:13:38 -08:00

gup_test.c

selftests/vm: gup_test: test faulting in kernel, and verify pinnable pages

2021-05-05 11:27:26 -07:00

hmm-tests.c

selftests/vm: hmm-tests: remove the libhugetlbfs dependency

2020-12-15 12:13:38 -08:00

hugepage-mmap.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

hugepage-shm.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

hugetlb_reparenting_test.sh

hugetlb_cgroup: add hugetlb_cgroup reservation tests

2020-04-02 09:35:32 -07:00

khugepaged.c

khugepaged: selftests: fix timeout condition in wait_for_scan()

2020-06-10 19:14:17 -07:00

Makefile

mm: huge_memory: a new debugfs interface for splitting THP tests

2021-05-05 11:27:21 -07:00

map_fixed_noreplace.c

tools/testing/selftests/vm/map_fixed_noreplace.c: add test for MAP_FIXED_NOREPLACE

2018-10-26 16:38:15 -07:00

map_hugetlb.c

selftests/vm: fix display of page size in map_hugetlb

2020-09-19 13:13:39 -07:00

map_populate.c

tools/testing/selftests/vm/: add MAP_POPULATE test

2018-08-22 10:52:45 -07:00

mlock2-tests.c

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

2020-04-02 09:35:31 -07:00

mlock2.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

mlock-random-test.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

mremap_dontunmap.c

selftests: add a MREMAP_DONTUNMAP selftest for shmem

2021-04-30 11:20:39 -07:00

mremap_test.c

kselftests: vm: add mremap tests

2020-12-15 12:13:40 -08:00

on-fault-limit.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

pkey-helpers.h

selftests/vm/pkeys: introduce a sub-page allocator

2020-06-04 19:06:27 -07:00

pkey-powerpc.h

selftests: vm: pkeys: use the correct page size on powerpc

2020-06-04 19:06:27 -07:00

pkey-x86.h

selftests/vm/pkeys: introduce a sub-page allocator

2020-06-04 19:06:27 -07:00

protection_keys.c

selftests/vm/keys: fix a broken reference at protection_keys.c

2020-06-26 10:01:12 -06:00

run_vmtests.sh

selftests/vm: rename file run_vmtests to run_vmtests.sh

2021-02-09 17:26:44 -08:00

split_huge_page_test.c

mm: huge_memory: debugfs for file-backed THP split

2021-05-05 11:27:21 -07:00

test_hmm.sh

mm/hmm/test: add selftests for HMM

2020-05-19 16:48:31 -03:00

test_vmalloc.sh

vm/test_vmalloc.sh: adapt for updated driver interface

2021-04-30 11:20:40 -07:00

thuge-gen.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

transhuge-stress.c

selftests/vm/transhuge-stress: stress test for memory compaction

2014-10-09 22:26:01 -04:00

userfaultfd.c

userfaultfd/selftests: add test exercising minor fault handling

2021-05-05 11:27:23 -07:00

va_128TBswitch.c

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 485

2019-06-19 17:09:52 +02:00

virtual_address_range.c

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 191

2019-05-30 11:29:21 -07:00

write_hugetlb_memory.sh

hugetlb_cgroup: add hugetlb_cgroup reservation tests

2020-04-02 09:35:32 -07:00

write_to_hugetlbfs.c

selftests/vm/write_to_hugetlbfs.c: fix unused variable warning

2020-05-23 10:26:31 -07:00