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

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Message-ID: <badb9a92-3682-4f89-88d2-0651386a31f7@linux.ibm.com>
Date: Wed, 4 Jun 2025 18:55:42 +0530
From: Donet Tom <donettom@...ux.ibm.com>
To: Andrew Morton <akpm@...ux-foundation.org>
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 6/4/25 8:37 AM, Andrew Morton wrote:
> 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.


Sorry, Andrew. I’ll include the cover letter in the next revision and 
make sure to follow this for all future patches.


>
>> ...
>>
>> 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.
>
>