From: Mike Rapoport <rppt@kernel.org>
To: Jaewon Kim <jaewon31.kim@samsung.com>
Cc: "vbabka@suse.cz" <vbabka@suse.cz>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
YongTaek Lee <ytk.lee@samsung.com>,
"jaewon31.kim@gmail.com" <jaewon31.kim@gmail.com>
Subject: Re: [PATCH 0/8] memblock: introduce memsize showing reserved memory
Date: Wed, 30 Mar 2022 10:08:24 +0300 [thread overview]
Message-ID: <YkQB6Ah603yPR3qf@kernel.org> (raw)
In-Reply-To: <20220329024620epcms1p7633018e83f54e532761008a60da5254f@epcms1p7>
Hi,
On Tue, Mar 29, 2022 at 11:46:20AM +0900, Jaewon Kim wrote:
> >> >
> >> >I'm still not following. The reserved region sizes are available in the
> >> >existing memblock debugfs.
> >> >Why the names are important? What is the value of having names for *some*
> >> >of the reserved regions?
> >>
> >> Hi
> >>
> >> There are many memory regions in memblock debugfs memory/reserved, and some might
> >> be splited or merged with other region. Among regions in debugfs, we can't find
> >> the one we defined in device tree. Especially it is difficult to find the region we
> >> described size only without start address.
> >>
> >> On mobile environment, memory is used by not only CPU but also GPU, Camera, Secure
> >> world, Audio, ETC. To support them, there are many reserved regions described in
> >> device tree. So the name is quite important to recognize a region. And with thename
> >> we can compare reserved memory map with other map.
> >
> >You still didn't describe your use case. What is the problem your patches
> >are trying to solve? Why is it important to know what is the use of particular
> >reserved region?
> >
> >You propose complex mechanism that seems to fit very particular scenario
> >and sprinkle some calls to this mechanism at random places because you need
> >to "compare reserved memory map with other map".
> >
> >Does not sound convincing to me, sorry.
>
> As I said serveral times, I want a simple knob showing all reserved
> memory status. The current debugfs, device tree do not show all those
> information I want. I think you also know that. i.e. late freed pages,
> splited or merged memblock, address defined at boot time, kernel size,
> ETC.
I know that there is not much information about reserved memory exposed and
I understand *what* are you trying to achieve. But you never provided
details about *why* you want this information exposed.
I don't mind providing more visibility into reserved memory attributes in
general, but I'd like to see something way more simple and localized.
--
Sincerely yours,
Mike.
next prev parent reply other threads:[~2022-03-30 7:08 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20220324065919epcas1p4c79da5f6ec4fa0311409ca24a38785d8@epcas1p4.samsung.com>
2022-03-24 7:01 ` [PATCH 0/8] memblock: introduce memsize showing reserved memory Jaewon Kim
[not found] ` <CGME20220324065919epcas1p35bafcd9151cf0469e4e933250c491a88@epcas1p3.samsung.com>
2022-03-24 7:01 ` [PATCH 1/8] " Jaewon Kim
[not found] ` <CGME20220324065919epcas1p1b30eabc8bbe01da1ef90280b6ee8bcea@epcas1p1.samsung.com>
2022-03-24 7:01 ` [PATCH 2/8] memblock: detect hidden memory hole size Jaewon Kim
[not found] ` <CGME20220324065919epcas1p3429ec2c9595c54ffe4ee25f273febd1c@epcas1p3.samsung.com>
2022-03-24 7:01 ` [PATCH 3/8] memblock: handle overlapped reserved memory region Jaewon Kim
[not found] ` <CGME20220324065919epcas1p256ff799f37a765a432475808e708d639@epcas1p2.samsung.com>
2022-03-24 7:01 ` [PATCH 4/8] memblock: track memblock changed at early param Jaewon Kim
[not found] ` <CGME20220324065919epcas1p3a3a267c4348be4fd3bb8437d4e6db142@epcas1p3.samsung.com>
2022-03-24 7:01 ` [PATCH 5/8] memblock: track kernel size on memsize Jaewon Kim
[not found] ` <CGME20220324065919epcas1p1058e2841b009d8c7d683bc0408f8a5a4@epcas1p1.samsung.com>
2022-03-24 7:01 ` [PATCH 6/8] memblock: recognize late free by checking PageReserved Jaewon Kim
[not found] ` <CGME20220324065919epcas1p4b935c884aa3fde0917f6dff8bff128ed@epcas1p4.samsung.com>
2022-03-24 7:01 ` [PATCH 7/8] memblock: print memsize summary information Jaewon Kim
[not found] ` <CGME20220324065919epcas1p46b5381b1b839d7076673c23e8f9b0bba@epcas1p4.samsung.com>
2022-03-24 7:01 ` [PATCH 8/8] memblock: print kernel internal size Jaewon Kim
2022-03-25 7:46 ` [PATCH 0/8] memblock: introduce memsize showing reserved memory Mike Rapoport
[not found] ` <CGME20220324065919epcas1p4c79da5f6ec4fa0311409ca24a38785d8@epcms1p3>
2022-03-25 8:38 ` Jaewon Kim
2022-03-27 7:40 ` Mike Rapoport
[not found] ` <CGME20220324065919epcas1p4c79da5f6ec4fa0311409ca24a38785d8@epcms1p1>
2022-03-27 13:53 ` Jaewon Kim
2022-03-27 15:15 ` Mike Rapoport
[not found] ` <CGME20220324065919epcas1p4c79da5f6ec4fa0311409ca24a38785d8@epcms1p7>
2022-03-29 2:46 ` Jaewon Kim
2022-03-30 7:08 ` Mike Rapoport [this message]
[not found] ` <CGME20220324065919epcas1p4c79da5f6ec4fa0311409ca24a38785d8@epcms1p8>
2022-03-30 7:22 ` Jaewon Kim
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