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authorNicholas Piggin2021-01-18 22:34:51 +1000
committerMichael Ellerman2021-01-30 11:39:32 +1100
commitc9f3401313a5089f100d7d1ef4b75cd7b49b2190 (patch)
treea378b5000a917cdc4d572c917f3d4cb30da83d92 /arch/powerpc/Kconfig
parent9dd31b11370380c488c8f2d347058617cd3fff99 (diff)
powerpc: Always enable queued spinlocks for 64s, disable for others
Queued spinlocks have shown to have good performance and fairness properties even on smaller (2 socket) POWER systems. This selects them automatically for 64s. For other platforms they are de-selected, the standard spinlock is far simpler and smaller code, and single chips with a handful of cores is unlikely to show any improvement. CONFIG_EXPERT still allows this to be changed, e.g., to help debug performance or correctness issues. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210118123451.1452206-1-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/Kconfig')
-rw-r--r--arch/powerpc/Kconfig8
1 files changed, 2 insertions, 6 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 107bb4319e0e..eebb4a8c156c 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -505,18 +505,14 @@ config HOTPLUG_CPU
Say N if you are unsure.
config PPC_QUEUED_SPINLOCKS
- bool "Queued spinlocks"
+ bool "Queued spinlocks" if EXPERT
depends on SMP
+ default PPC_BOOK3S_64
help
Say Y here to use queued spinlocks which give better scalability and
fairness on large SMP and NUMA systems without harming single threaded
performance.
- This option is currently experimental, the code is more complex and
- less tested so it defaults to "N" for the moment.
-
- If unsure, say "N".
-
config ARCH_CPU_PROBE_RELEASE
def_bool y
depends on HOTPLUG_CPU