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| author | Nicholas Piggin <npiggin@gmail.com> | 2017-11-03 15:13:20 +1100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-11-06 22:46:15 +1100 |
| commit | 9d2f510a66ec60411536b83dab831ee091c84307 (patch) | |
| tree | 0c121b6385a2309189bbe1edda5b28815f7f8952 /COPYING | |
| parent | b6b3755e9bec9c686a34ec81eacced0075370cbc (diff) | |
| download | linux-stable-9d2f510a66ec60411536b83dab831ee091c84307.tar.gz linux-stable-9d2f510a66ec60411536b83dab831ee091c84307.tar.bz2 linux-stable-9d2f510a66ec60411536b83dab831ee091c84307.zip | |
powerpc/64s/idle: avoid POWER9 DD1 and DD2.0 ERAT workaround on DD2.1
DD2.1 does not have to flush the ERAT after a state-loss idle.
Performance testing was done on a DD2.1 using only the stop0 idle state
(the shallowest state which supports state loss), using context_switch
selftest configured to ping-poing between two threads on the same core
and two different cores.
Performance improvement for same core is 7.0%, different cores is 14.8%.
Reviewed-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
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