Hi,
Nit on the subject: this only increases the default, the max is still 2¹⁰. On 20/10/20 18:34, Vanshidhar Konda wrote: > The current arm64 max NUMA nodes default to 4. Today's arm64 systems can > reach or exceed 16. Increase the number to 64 (matching x86_64). > > Signed-off-by: Vanshidhar Konda <vanshiko...@os.amperecomputing.com> > --- > arch/arm64/Kconfig | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > index 893130ce1626..3e69d3c981be 100644 > --- a/arch/arm64/Kconfig > +++ b/arch/arm64/Kconfig > @@ -980,7 +980,7 @@ config NUMA > config NODES_SHIFT > int "Maximum NUMA Nodes (as a power of 2)" > range 1 10 > - default "2" > + default "6" This leads to more statically allocated memory for things like node to CPU maps (see uses of MAX_NUMNODES), but that shouldn't be too much of an issue. AIUI this also directly correlates to how many more page->flags bits are required: are we sure the max 10 works on any aarch64 platform? I'm genuinely asking here, given that I'm mostly a stranger to the mm world. The default should be something we're somewhat confident works everywhere. > depends on NEED_MULTIPLE_NODES > help > Specify the maximum number of NUMA Nodes available on the target
