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| author | Nicholas Piggin <npiggin@gmail.com> | 2018-06-01 13:01:20 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-06-03 13:40:36 +0300 |
| commit | 85bcfaf69cbd610fdfac3351cf385809a2f4a93b (patch) | |
| tree | 0c3ec307217742cf1857462744ca588ecca006e9 /tools/perf/scripts/python/export-to-sqlite.py | |
| parent | f1cb8f9beba8699dd1b4518418191499e53f7b17 (diff) | |
| download | linux-85bcfaf69cbd610fdfac3351cf385809a2f4a93b.tar.xz | |
powerpc/64s/radix: optimise pte_update
Implementing pte_update with pte_xchg (which uses cmpxchg) is
inefficient. A single larx/stcx. works fine, no need for the less
efficient cmpxchg sequence.
Then remove the memory barriers from the operation. There is a
requirement for TLB flushing to load mm_cpumask after the store
that reduces pte permissions, which is moved into the TLB flush
code.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'tools/perf/scripts/python/export-to-sqlite.py')
0 files changed, 0 insertions, 0 deletions