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| author | Nicholas Piggin <npiggin@gmail.com> | 2018-09-15 01:30:50 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-09-19 21:59:44 +1000 |
| commit | 82d8f4c22f3514eface7e082750bc917193d91f9 (patch) | |
| tree | fb4623b052c28a5caf07bd2ff128d7931fe3ce30 /COPYING | |
| parent | 5141c182d75b4004c41ac2dc5af081b457b3e8cb (diff) | |
powerpc/64s/hash: Use POWER9 SLBIA IH=3 variant in switch_slb
POWER9 introduces SLBIA IH=3, which invalidates all SLB entries and
associated lookaside information that have a class value of 1, which
Linux assigns to user addresses. This matches what switch_slb wants,
and allows a simple fast implementation that avoids the slb_cache
complexity.
As a side-effect, the POWER5 < DD2.1 SLB invalidation workaround is
also avoided on POWER9.
Process context switching rate is improved about 2.2% for a small
process that hits the slb cache which is the best case for the current
code.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'COPYING')
0 files changed, 0 insertions, 0 deletions