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| author | Nicholas Piggin <npiggin@gmail.com> | 2018-03-07 11:37:11 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-03-13 23:43:05 +1100 |
| commit | 830fd2d45aa11631325404904d02c7b530d40119 (patch) | |
| tree | 2f31d16fbefe4ff93716c5b3793e64022615fb6d /tools/perf/scripts/python | |
| parent | powerpc/mm/slice: tidy lpsizes and hpsizes update loops (diff) | |
| download | linux-830fd2d45aa11631325404904d02c7b530d40119.tar.gz linux-830fd2d45aa11631325404904d02c7b530d40119.zip | |
powerpc/mm/slice: pass pointers to struct slice_mask where possible
Pass around const pointers to struct slice_mask where possible, rather
than copies of slice_mask, to reduce stack and call overhead.
checkstack.pl gives, before:
0x00000d1c slice_get_unmapped_area [slice.o]: 592
0x00001864 is_hugepage_only_range [slice.o]: 448
0x00000754 slice_find_area_topdown [slice.o]: 400
0x00000484 slice_find_area_bottomup.isra.1 [slice.o]: 272
0x000017b4 slice_set_range_psize [slice.o]: 224
0x00000a4c slice_find_area [slice.o]: 128
0x00000160 slice_check_fit [slice.o]: 112
after:
0x00000ad0 slice_get_unmapped_area [slice.o]: 448
0x00001464 is_hugepage_only_range [slice.o]: 288
0x000006c0 slice_find_area [slice.o]: 144
0x0000016c slice_check_fit [slice.o]: 128
0x00000528 slice_find_area_bottomup.isra.2 [slice.o]: 128
0x000013e4 slice_set_range_psize [slice.o]: 128
This increases vfork+exec+exit performance by 1.5%.
Reduces time to mmap+munmap a 64kB page by 17%.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'tools/perf/scripts/python')
0 files changed, 0 insertions, 0 deletions