The patch titled
Subject: selftests/vm: 10x speedup for hmm-tests
has been added to the -mm tree. Its filename is
selftests-vm-10x-speedup-for-hmm-tests.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/selftests-vm-10x-speedup-for-hmm-tests.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/selftests-vm-10x-speedup-for-hmm-tests.patch
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------------------------------------------------------
From: John Hubbard <jhubbard@xxxxxxxxxx>
Subject: selftests/vm: 10x speedup for hmm-tests
This patch reduces the running time for hmm-tests from about 10+ seconds,
to just under 1.0 second, for an approximately 10x speedup. That brings
it in line with most of the other tests in selftests/vm, which mostly run
in < 1 sec.
This is done with a one-line change that simply reduces the number of
iterations of several tests, from 256, to 10. Thanks to Ralph Campbell
for suggesting changing NTIMES as a way to get the speedup.
Link: https://lkml.kernel.org/r/20201003011721.44238-1-jhubbard@xxxxxxxxxx
Signed-off-by: John Hubbard <jhubbard@xxxxxxxxxx>
Suggested-by: Ralph Campbell <rcampbell@xxxxxxxxxx>
Cc: SeongJae Park <sj38.park@xxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/vm/hmm-tests.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/tools/testing/selftests/vm/hmm-tests.c~selftests-vm-10x-speedup-for-hmm-tests
+++ a/tools/testing/selftests/vm/hmm-tests.c
@@ -49,7 +49,7 @@ struct hmm_buffer {
#define TWOMEG (1 << 21)
#define HMM_BUFFER_SIZE (1024 << 12)
#define HMM_PATH_MAX 64
-#define NTIMES 256
+#define NTIMES 10
#define ALIGN(x, a) (((x) + (a - 1)) & (~((a) - 1)))
_
Patches currently in -mm which might be from jhubbard@xxxxxxxxxx are
mm-dump_page-rename-head_mapcount-head_compound_mapcount.patch
mm-gup-protect-unpin_user_pages-against-npages==-errno.patch
selftests-vm-fix-false-build-success-on-the-second-and-later-attempts.patch
selftests-vm-fix-incorrect-gcc-invocation-in-some-cases.patch
selftests-vm-8x-compaction_test-speedup.patch
mm-gup_benchmark-rename-to-mm-gup_test.patch
selftests-vm-use-a-common-gup_testh.patch
selftests-vm-rename-run_vmtests-run_vmtestssh.patch
selftests-vm-minor-cleanup-makefile-and-gup_testc.patch
selftests-vm-only-some-gup_test-items-are-really-benchmarks.patch
selftests-vm-gup_test-introduce-the-dump_pages-sub-test.patch
selftests-vm-run_vmtestsh-update-and-clean-up-gup_test-invocation.patch
selftests-vm-hmm-tests-remove-the-libhugetlbfs-dependency.patch
selftests-vm-hmm-tests-remove-the-libhugetlbfs-dependency-fix.patch
selftests-vm-10x-speedup-for-hmm-tests.patch
