linux-kernel - Re: (2) [RESEND PATCH 00/10] memblock: introduce memsize showing reserved memory

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Message-ID: <CAOuPNLhN16FcYyAj7i2S9P7wJr+Z1LTDOOOkDZUwwq1_ZMiv3A@mail.gmail.com>
Date: Fri, 24 May 2024 23:03:26 +0530
From: Pintu Agarwal <pintu.ping@...il.com>
To: Mike Rapoport <rppt@...nel.org>
Cc: Jaewon Kim <jaewon31.kim@...sung.com>, "vbabka@...e.cz" <vbabka@...e.cz>, 
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>, "linux-mm@...ck.org" <linux-mm@...ck.org>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, 
	"jaewon31.kim@...il.com" <jaewon31.kim@...il.com>, "tkjos@...gle.com" <tkjos@...gle.com>
Subject: Re: (2) [RESEND PATCH 00/10] memblock: introduce memsize showing
 reserved memory

On Thu, 23 May 2024 at 20:06, Mike Rapoport <rppt@...nel.org> wrote:
>
> On Tue, May 21, 2024 at 07:17:53PM +0900, Jaewon Kim wrote:
> > >On Tue, May 21, 2024 at 11:53:29AM +0900, Jaewon Kim wrote:
> > >> >--------- Original Message ---------
> > >> >Sender : 김재원 <jaewon31.kim@...sung.com>System Performance Lab.(MX)/삼성전자
> > >> >Date   : 2024-05-21 11:40 (GMT+9)
> > >> >Title  : [RESEND PATCH 00/10] memblock: introduce memsize showing reserved memory
> > >> >?
> > >> >Some of memory regions can be reserved for a specific purpose. They are
> > >> >usually defined through reserved-memory in device tree. If only size
> > >> >without address is specified in device tree, the address of the region
> > >> >will be determined at boot time.
> > >> >
> > >> >We may find the address of the memory regions through booting log, but
> > >> >it does not show all. And it could be hard to catch the very beginning
> > >> >log. The memblock_dump_all shows all memblock status but it does not
> > >> >show region name and its information is difficult to summarize.

Something similar, we have already proposed almost 10 years ago for memblock.
That time I realised some of these reserved memory break-up becomes
useful and handy when we are gathering reserved memory stats on a
small embedded device where every bit of memory reserved is important
and being questioned.

You can get some information about Kernel reserved from dmesg | grep
-i Memory (including the kernel init, text, data) and the cma-reserved
as well. Here the cma-reserved was added by me.

You can also get these Kernel reserved size info from vmlinux.
size -t vmlinux