| Message ID | 20200223192520.20808-3-aarcange@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [1/3] mm: use_mm: fix for arches checking mm_users to optimize TLB flushes | expand |
On Sun, Feb 23, 2020 at 02:25:19PM -0500, Andrea Arcangeli wrote: > It's unclear why normally CPUMASK_OFFSTACK can only be manually > configured "if DEBUG_PER_CPU_MAPS" which is not an option meant to be > enabled on enterprise arm64 kernels. > > The default enterprise kernels NR_CPUS is 4096 which is fairly large. > So it'll save some RAM and it'll increase reliability to select > CPUMASK_OFFSET at least when NUMA is selected and a large NR_CPUS is > to be expected. > > Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> > --- > arch/arm64/Kconfig | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > index 0b30e884e088..882887e65394 100644 > --- a/arch/arm64/Kconfig > +++ b/arch/arm64/Kconfig > @@ -955,6 +955,7 @@ config NUMA > bool "Numa Memory Allocation and Scheduler Support" > select ACPI_NUMA if ACPI > select OF_NUMA > + select CPUMASK_OFFSTACK > help > Enable NUMA (Non Uniform Memory Access) support. > Acked-by: Rafael Aquini <aquini@redhat.com>
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 0b30e884e088..882887e65394 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -955,6 +955,7 @@ config NUMA bool "Numa Memory Allocation and Scheduler Support" select ACPI_NUMA if ACPI select OF_NUMA + select CPUMASK_OFFSTACK help Enable NUMA (Non Uniform Memory Access) support.
It's unclear why normally CPUMASK_OFFSTACK can only be manually configured "if DEBUG_PER_CPU_MAPS" which is not an option meant to be enabled on enterprise arm64 kernels. The default enterprise kernels NR_CPUS is 4096 which is fairly large. So it'll save some RAM and it'll increase reliability to select CPUMASK_OFFSET at least when NUMA is selected and a large NR_CPUS is to be expected. Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> --- arch/arm64/Kconfig | 1 + 1 file changed, 1 insertion(+)