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| author | Nicholas Piggin <npiggin@gmail.com> | 2018-03-07 11:37:12 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-03-13 23:43:06 +1100 |
| commit | 5709f7cfd8305252dc327206bd674ad65ca4d77f (patch) | |
| tree | 3bff567b21774e60411dbc9722211e121983f9c6 /tools/perf/scripts/python | |
| parent | powerpc/mm/slice: pass pointers to struct slice_mask where possible (diff) | |
| download | linux-5709f7cfd8305252dc327206bd674ad65ca4d77f.tar.gz linux-5709f7cfd8305252dc327206bd674ad65ca4d77f.zip | |
powerpc/mm/slice: implement a slice mask cache
Calculating the slice mask can become a signifcant overhead for
get_unmapped_area. This patch adds a struct slice_mask for
each page size in the mm_context, and keeps these in synch with
the slices psize arrays and slb_addr_limit.
On Book3S/64 this adds 288 bytes to the mm_context_t for the
slice mask caches.
On POWER8, this increases vfork+exec+exit performance by 9.9%
and reduces time to mmap+munmap a 64kB page by 28%.
Reduces time to mmap+munmap by about 10% on 8xx.
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