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

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Message-Id: <20250603200729.b7581e017e4ca63f502c795e@linux-foundation.org>
Date: Tue, 3 Jun 2025 20:07:29 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Donet Tom <donettom@...ux.ibm.com>
Cc: David Hildenbrand <david@...hat.com>, Mike Rapoport <rppt@...nel.org>,
 Oscar Salvador <osalvador@...e.de>, Zi Yan <ziy@...dia.com>, Greg
 Kroah-Hartman <gregkh@...uxfoundation.org>, Ritesh Harjani
 <ritesh.list@...il.com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
 "Rafael J . Wysocki" <rafael@...nel.org>, Danilo Krummrich
 <dakr@...nel.org>, Jonathan Cameron <Jonathan.Cameron@...wei.com>, Alison
 Schofield <alison.schofield@...el.com>, Yury Norov <yury.norov@...il.com>,
 Dave Jiang <dave.jiang@...el.com>, Madhavan Srinivasan
 <maddy@...ux.ibm.com>, Nilay Shroff <nilay@...ux.ibm.com>,
 linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v7 1/5] drivers/base/node: Optimize memory block
 registration to reduce boot time

On Wed, 28 May 2025 12:18:00 -0500 Donet Tom <donettom@...ux.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.