[PATCH v7 1/5] drivers/base/node: Optimize memory block registration to reduce boot time

[Andrew Morton]

On Wed, 28 May 2025 12:18:00 -0500 Donet Tom <donettom at linux.ibm.com> wrote:

> During node device initialization, `memory blocks` are registered under
> each NUMA node. The `memory blocks` to be registered are identified using
> the node’s start and end PFNs, which are obtained from the node's pg_data

It's quite unconventional to omit the [0/N] changelog.  This omission
somewhat messed up my processes so I added a one-liner to this.

>
> ...
>
> Test Results on My system with 32TB RAM
> =======================================
> 1. Boot time with CONFIG_DEFERRED_STRUCT_PAGE_INIT enabled.
> 
> Without this patch
> ------------------
> Startup finished in 1min 16.528s (kernel)
> 
> With this patch
> ---------------
> Startup finished in 17.236s (kernel) - 78% Improvement

Well someone is in for a nice surprise.

> 2. Boot time with CONFIG_DEFERRED_STRUCT_PAGE_INIT disabled.
> 
> Without this patch
> ------------------
> Startup finished in 28.320s (kernel)

what.  CONFIG_DEFERRED_STRUCT_PAGE_INIT is supposed to make bootup
faster.