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| author | Nicholas Piggin <npiggin@gmail.com> | 2021-01-18 15:34:51 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-01-30 03:39:32 +0300 |
| commit | c9f3401313a5089f100d7d1ef4b75cd7b49b2190 (patch) | |
| tree | a378b5000a917cdc4d572c917f3d4cb30da83d92 /arch/powerpc/Kconfig | |
| parent | 9dd31b11370380c488c8f2d347058617cd3fff99 (diff) | |
| download | linux-c9f3401313a5089f100d7d1ef4b75cd7b49b2190.tar.xz | |
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/Kconfig | 8 |
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 |