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Subject: RE: [RESEND PATCH 00/10] memblock: introduce memsize showing
 reserved memory
Reply-To: jaewon31.kim@samsung.com
Sender: Jaewon Kim <jaewon31.kim@samsung.com>
From: Jaewon Kim <jaewon31.kim@samsung.com>
To: Jaewon Kim <jaewon31.kim@samsung.com>, "rppt@kernel.org"
	<rppt@kernel.org>, "vbabka@suse.cz" <vbabka@suse.cz>,
	"akpm@linux-foundation.org" <akpm@linux-foundation.org>
CC: "linux-mm@kvack.org" <linux-mm@kvack.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"jaewon31.kim@gmail.com" <jaewon31.kim@gmail.com>, "tkjos@google.com"
	<tkjos@google.com>
In-Reply-To: <20240521023957.2587005-1-jaewon31.kim@samsung.com>
Message-ID: <20240521025329epcms1p6ce11064c0f0608a0156d82fda7ef285c@epcms1p6>
Date: Tue, 21 May 2024 11:53:29 +0900
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References: <20240521023957.2587005-1-jaewon31.kim@samsung.com>
	<CGME20240521024009epcas1p10ed9f9b929203183a29f79508e79bb76@epcms1p6>

>--------- Original Message ---------
>Sender : =EA=B9=80=EC=9E=AC=EC=9B=90=20<jaewon31.kim=40samsung.com>System=
=20Performance=20Lab.(MX)/=EC=82=BC=EC=84=B1=EC=A0=84=EC=9E=90=0D=0A>Date=
=20=20=20:=202024-05-21=2011:40=20(GMT+9)=0D=0A>Title=20=20:=20=5BRESEND=20=
PATCH=2000/10=5D=20memblock:=20introduce=20memsize=20showing=20reserved=20m=
emory=0D=0A>?=0D=0A>Some=20of=20memory=20regions=20can=20be=20reserved=20fo=
r=20a=20specific=20purpose.=20They=20are=0D=0A>usually=20defined=20through=
=20reserved-memory=20in=20device=20tree.=20If=20only=20size=0D=0A>without=
=20address=20is=20specified=20in=20device=20tree,=20the=20address=20of=20th=
e=20region=0D=0A>will=20be=20determined=20at=20boot=20time.=0D=0A>=0D=0A>We=
=20may=20find=20the=20address=20of=20the=20memory=20regions=20through=20boo=
ting=20log,=20but=0D=0A>it=20does=20not=20show=20all.=20And=20it=20could=20=
be=20hard=20to=20catch=20the=20very=20beginning=0D=0A>log.=20The=20memblock=
_dump_all=20shows=20all=20memblock=20status=20but=20it=20does=20not=0D=0A>s=
how=20region=20name=20and=20its=20information=20is=20difficult=20to=20summa=
rize.=0D=0A>=0D=0A>This=20patch=20introduce=20a=20debugfs=20node,=20membloc=
k/memsize,=20to=20see=20reserved=0D=0A>memory=20easily.=0D=0A>=0D=0A>Here's=
=20an=20example=0D=0A>=0D=0A>=24=20cat=20debugfs/memblock/memsize=0D=0A>=0D=
=0A>0x0000000000000000-0x0000000000000000=200x02000000=20(?=20=2032768=20KB=
=20)?=20=20map=20reusable=20linux,cma=0D=0A>0x0000000000000000-0x0000000000=
000000=200x01000000=20(?=20=2016384=20KB=20)?=20=20map=20reusable=20vxxxxx=
=0D=0A>...=0D=0A>0x0000000000000000-0x0000000000000000=200x004e0000=20(?=20=
?=204992=20KB=20)=20nomap=20unusable=20unknown=0D=0A>0x0000000000000000-0x0=
000000000000000=200x00400000=20(?=20?=204096=20KB=20)=20nomap=20unusable=20=
cxxxxx=0D=0A>0x0000000000000000-0x0000000000000000=200x00e00000=20(?=20=201=
4336=20KB=20)=20nomap=20unusable=20gxxxxx=0D=0A>=0D=0A>Reserved?=20?=20:=20=
1223856=20KB=0D=0A>=20.kernel?=20?=20:?=20275208=20KB=0D=0A>?=20.text?=20?=
=20=20:?=20=2016576=20KB=0D=0A>?=20.rwdata?=20=20:?=20?=201963=20KB=0D=0A>?=
=20.rodata?=20=20:?=20=2011920=20KB=0D=0A>?=20.bss?=20?=20?=20:?=20?=202450=
=20KB=0D=0A>?=20.memmap?=20=20:?=20186368=20KB=0D=0A>?=20.etc?=20?=20?=20:?=
=20=2055933=20KB=0D=0A>=20.unusable?=20:?=20948648=20KB=0D=0A>System?=20?=
=20?=20:=2011359056=20KB=0D=0A>=20.common?=20?=20:=2010306384=20KB=0D=0A>=
=20.reusable?=20:=201052672=20KB=0D=0A>Total?=20?=20?=20=20:=2012582912=20K=
B=20(=2012288.00=20MB=20)=0D=0A>=0D=0A>Jaewon=20Kim=20(10):=0D=0A>?=20membl=
ock:=20introduce=20memsize=20showing=20reserved=20memory=0D=0A>?=20memblock=
:=20detect=20hidden=20memory=20hole=20size=0D=0A>?=20memblock:=20handle=20o=
verlapped=20reserved=20memory=20region=0D=0A>?=20memblock:=20take=20a=20reg=
ion=20intersecting=20an=20unknown=20region=0D=0A>?=20memblock:=20track=20me=
mblock=20changed=20at=20early=20param=0D=0A>?=20memblock:=20recognize=20lat=
e=20freed=20size=20by=20checking=20PageReserved=0D=0A>?=20memblock:=20track=
=20kernel=20size=20on=20memsize=0D=0A>?=20memblock:=20print=20memsize=20sum=
mary=20information=0D=0A>?=20memblock:=20print=20kernel=20internal=20size=
=0D=0A>?=20memblock:=20support=20memsize=20reusable=20to=20consider=20as=20=
reusable=0D=0A>=0D=0A>=20drivers/of/fdt.c?=20?=20?=20?=20?=20?=20=20=7C?=20=
11=20+=0D=0A>=20drivers/of/of_reserved_mem.c=20=7C?=2012=20+-=0D=0A>=20incl=
ude/linux/memblock.h?=20?=20=20=7C?=2029=20++=0D=0A>=20init/main.c?=20?=20?=
=20?=20?=20?=20?=20?=20?=20=7C?=2013=20+-=0D=0A>=20kernel/dma/contiguous.c?=
=20?=20?=20=7C?=20=209=20+-=0D=0A>=20mm/Kconfig?=20?=20?=20?=20?=20?=20?=20=
?=20?=20=20=7C?=2016=20++=0D=0A>=20mm/memblock.c?=20?=20?=20?=20?=20?=20?=
=20?=20=7C=20502=20++++++++++++++++++++++++++++++++++-=0D=0A>=20mm/mm_init.=
c?=20?=20?=20?=20?=20?=20?=20?=20=20=7C?=20=206=20+-=0D=0A>=20mm/page_alloc=
c?=20?=20?=20?=20?=20?=20?=20=7C?=2010=20+-=0D=0A>=209=20files=20changed,=
=20597=20insertions(+),=2011=20deletions(-)=0D=0A>=0D=0A>--=20=0D=0A>2.25.1=
=0D=0A=0D=0AHello=20Mike=20=0D=0A=0D=0AThis=20is=20actually=20RESEND=20as=
=20it=20was=20introduced=202=20years=20ago.=0D=0APlease=20refer=20to=20http=
s://lore.kernel.org/linux-mm/YkQB6Ah603yPR3qf=40kernel.org/=23t=0D=0A=0D=0A=
>=20But=20you=20never=20provided=20details=20about=20*why*=20you=20want=20t=
his=20information=20exposed.=0D=0A=0D=0AFor=20your=20question,=20I'd=20like=
=20to=20say=20;=0D=0AWe=20can=20see=20the=20same=20format=20and=20exact=20i=
nformation=20between=20different=20version=20of=20kernel=20status.=0D=0A=0D=
=0A1)=20Internally=20we=20can=20check=20if=20the=20reserved=20memory=20chan=
ges.=0D=0A2)=20Externally=20we=20can=20communicate=20between=20chipset=20ve=
ndors=20and=20OEM,=20with=20a=20same=20format.=0D=0A=0D=0AThis=20helps=20us=
=20to=20communitcate=20well,=20to=20easily=20detect=20changes=20or=20just=
=20to=20see=20differences.=0D=0A=0D=0AJaewon=20Kim=0D=0A