Support emulated NUMA for BCM2711 and BCM2712 #6443
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system_heap.max_order=<uint> Signed-off-by: Tvrtko Ursulin <[email protected]>
Add numa_policy kernel argument to allow overriding the kernel's default NUMA policy at boot time. Syntax identical to what tmpfs accepts as it's mpol argument is accepted. Some examples: numa_policy=interleave numa_policy=interleave=skip-interleave numa_policy=bind:0-3,5,7,9-15 numa_policy=bind=static:1-2 Signed-off-by: Tvrtko Ursulin <[email protected]>
... Make sure CMA zones do not straddle the emulated NUMA nodes ... Signed-off-by: Tvrtko Ursulin <[email protected]>
Allow NUMA and NUMA_EMULATION on 64-bit Pi kernels Signed-off-by: Dom Cobley <[email protected]>
Most 2711 devices and all 2712 device share common bootargs (command lines). Make the common values shared defaults, overriding them were necessary. Signed-off-by: Phil Elwell <[email protected]>
The default cmdline adjustment is now numa_policy=interleave for 2711 and 2712, and additionally system_heap.max_order=0 iommu_dma_numa_policy=interleave for just 2712 (due to its better iommu support). The key setting numa=fake=<n> is not set here, so we will boot with a single numa region and behaviour should be pretty much unchanged from before this PR. Signed-off-by: Dom Cobley <[email protected]>
pelwell
approved these changes
Oct 25, 2024
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This is 6.12 version of #6273
Note, the implementation is different, as it uses a parallel implementation of NUMA_EMU that has been merged upstream.
Note, on 6.6 it was enabled with CONFIG_NUMA_EMULATION and on 6.12 it is CONFIG_NUMA_EMU.
The downstream patches to avoid cma failure and set default configuration are a little different.