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| author |   Nicholas Piggin <npiggin@gmail.com> | 2020-07-24 23:14:21 +1000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2020-07-27 00:01:29 +1000 |
| commit | 20c0e8269e9d515e677670902c7e1cc0209d6ad9 (patch) | |
| tree | 1de7272a98830301f6d21a1b8cdab7d28d0e83c1 /arch/powerpc/platforms/pseries/Kconfig | |
| parent | powerpc/64s: Implement queued spinlocks and rwlocks (diff) | |
| download | linux-dev-20c0e8269e9d515e677670902c7e1cc0209d6ad9.tar.xz linux-dev-20c0e8269e9d515e677670902c7e1cc0209d6ad9.zip | |
powerpc/pseries: Implement paravirt qspinlocks for SPLPAR
This implements the generic paravirt qspinlocks using H_PROD and
H_CONFER to kick and wait.
This uses an un-directed yield to any CPU rather than the directed
yield to a pre-empted lock holder that paravirtualised simple
spinlocks use, that requires no kick hcall. This is something that
could be investigated and improved in future.
Performance results can be found in the commit which added queued
spinlocks.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Waiman Long <longman@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200724131423.1362108-5-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/platforms/pseries/Kconfig')
| -rw-r--r-- | arch/powerpc/platforms/pseries/Kconfig | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/pseries/Kconfig b/arch/powerpc/platforms/pseries/Kconfig index 24c18362e5ea..5e037df2a3a1 100644 --- a/arch/powerpc/platforms/pseries/Kconfig +++ b/arch/powerpc/platforms/pseries/Kconfig @@ -25,15 +25,22 @@ config PPC_PSERIES select SWIOTLB default y +config PARAVIRT_SPINLOCKS + bool + config PPC_SPLPAR - depends on PPC_PSERIES bool "Support for shared-processor logical partitions" + depends on PPC_PSERIES + select PARAVIRT_SPINLOCKS if PPC_QUEUED_SPINLOCKS + default y help Enabling this option will make the kernel run more efficiently on logically-partitioned pSeries systems which use shared processors, that is, which share physical processors between two or more partitions. + Say Y if you are unsure. + config DTL bool "Dispatch Trace Log" depends on PPC_SPLPAR && DEBUG_FS |