Re: [PATCH v2 00/11] Optimization to improve CPU online/offline on Powerpc

[Michael Ellerman]

On Mon, 21 Sep 2020 15:26:42 +0530, Srikar Dronamraju wrote:
> Here are some optimizations and fixes to make CPU online/offline
> faster and hence result in faster bootup.
> 
> Its based on top of my v5 coregroup support patchset.
> https://lore.kernel.org/linuxppc-dev/20200810071834.92514-1-srikar@xxxxxxxxxxxxxxxxxx/t/#u
> 
> Anton reported that his 4096 cpu (1024 cores in a socket) was taking too
> long to boot. He also analyzed that most of the time was being spent on
> updating cpu_core_mask.
> 
> [...]

Applied to powerpc/next.

[01/11] powerpc/topology: Update topology_core_cpumask
        https://git.kernel.org/powerpc/c/4bce545903fa0290e011cf118997717f0c4f4d20
[02/11] powerpc/smp: Stop updating cpu_core_mask
        https://git.kernel.org/powerpc/c/4ca234a9cbd7c3a656b34dd98c8b156f70ed7849
[03/11] powerpc/smp: Remove get_physical_package_id
        https://git.kernel.org/powerpc/c/e29e9ed665eeb6f98cd88672994ecf4aaefdb943
[04/11] powerpc/smp: Optimize remove_cpu_from_masks
        https://git.kernel.org/powerpc/c/70edd4a7c753ba18e3e4bb9e97b6d85156cea738
[05/11] powerpc/smp: Limit CPUs traversed to within a node.
        https://git.kernel.org/powerpc/c/53516d4abacfab1faaa075c1f79957abc3da358c
[06/11] powerpc/smp: Stop passing mask to update_mask_by_l2
        https://git.kernel.org/powerpc/c/1f3a4181042107e32e44047e9dde990aced845b5
[07/11] powerpc/smp: Depend on cpu_l1_cache_map when adding CPUs
        https://git.kernel.org/powerpc/c/661e3d42f99193b7fdd71467a87e48f6e597c285
[08/11] powerpc/smp: Check for duplicate topologies and consolidate
        https://git.kernel.org/powerpc/c/375370a10d061d5c75c6bc5b09c5db4cc0b0fcfe
[09/11] powerpc/smp: Optimize update_mask_by_l2
        https://git.kernel.org/powerpc/c/3ab33d6dc3e98e83b55732049e1d1d488207bb6d
[10/11] powerpc/smp: Move coregroup mask updation to a new function
        https://git.kernel.org/powerpc/c/b8a97cb4599cda28bd3b3bc13042f5803b42ad65
[11/11] powerpc/smp: Optimize update_coregroup_mask
        https://git.kernel.org/powerpc/c/70a94089d7f7fa91bc1795622426b3ed017ec71a

cheers