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ESMTP id 4Vlzh41dPcz4x9Ps; Fri, 24 May 2024 09:07:16 +0000 (GMT) X-AuditID: b6c32a36-7a9f9700000025e0-3d-665058c439b9 Received: from epcas1p3.samsung.com ( [182.195.41.47]) by epsmgec1p1.samsung.com (Symantec Messaging Gateway) with SMTP id B2.EF.09696.4C850566; Fri, 24 May 2024 18:07:16 +0900 (KST) To: undisclosed-recipients:; Mime-Version: 1.0 Subject: RE: (2) [RESEND PATCH 00/10] memblock: introduce memsize showing reserved memory Reply-To: jaewon31.kim@samsung.com From: Jaewon Kim X-Priority: 3 X-Content-Kind-Code: NORMAL In-Reply-To: X-Drm-Type: N,general X-Msg-Generator: Mail X-Msg-Type: PERSONAL X-Reply-Demand: N Message-ID: <20240524090715epcms1p274939a1d5954be3423f6ce14a3df6f92@epcms1p2> Date: Fri, 24 May 2024 18:07:15 +0900 X-CMS-MailID: 20240524090715epcms1p274939a1d5954be3423f6ce14a3df6f92 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" CMS-TYPE: 101P X-CPGSPASS: Y X-CPGSPASS: Y X-Brightmail-Tracker: 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 Ik1kaWQi m3DQXWodLupQhYIpMEP2jwL8cv3FzRSg7z+qmayu295k9v7/SmzCqfe7A8MKWhPAvwGyAj0GTjFWwIppGPCsk4FOgB8RqjFq0jKkOClSw20fhvOHOXbjCFByU+Hr+Wiqy7WIezLShOGTG9eysf3Q/VWMpHRZGW0TWzFxQPX+S5ivqW2SGeuJ0oUNbt6UZCiWqpxbGVJeLPXUj+dc= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: >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 : =EA=B9=80=EC=9E=AC=EC=9B=90=20S= ystem=20Performance=20Lab.(MX)/=EC=82=BC=EC=84=B1=EC=A0=84=EC=9E=90=0D=0A>>= =20>>=20>Date=20=20=20:=202024-05-21=2011:40=20(GMT+9)=0D=0A>>=20>>=20>Titl= e=20=20:=20=5BRESEND=20PATCH=2000/10=5D=20memblock:=20introduce=20memsize= =20showing=20reserved=20memory=0D=0A>>=20>>=20>?=0D=0A>>=20>>=20>Some=20of= =20memory=20regions=20can=20be=20reserved=20for=20a=20specific=20purpose.= =20They=20are=0D=0A>>=20>>=20>usually=20defined=20through=20reserved-memory= =20in=20device=20tree.=20If=20only=20size=0D=0A>>=20>>=20>without=20address= =20is=20specified=20in=20device=20tree,=20the=20address=20of=20the=20region= =0D=0A>>=20>>=20>will=20be=20determined=20at=20boot=20time.=0D=0A>>=20>>=20= >=0D=0A>>=20>>=20>We=20may=20find=20the=20address=20of=20the=20memory=20reg= ions=20through=20booting=20log,=20but=0D=0A>>=20>>=20>it=20does=20not=20sho= w=20all.=20And=20it=20could=20be=20hard=20to=20catch=20the=20very=20beginni= ng=0D=0A>>=20>>=20>log.=20The=20memblock_dump_all=20shows=20all=20memblock= =20status=20but=20it=20does=20not=0D=0A>>=20>>=20>show=20region=20name=20an= d=20its=20information=20is=20difficult=20to=20summarize.=0D=0A>>=20>>=20>= =0D=0A>>=20>>=20>This=20patch=20introduce=20a=20debugfs=20node,=20memblock/= memsize,=20to=20see=20reserved=0D=0A>>=20>>=20>memory=20easily.=0D=0A>>=20>= >=20=0D=0A>>=20>>=20This=20is=20actually=20RESEND=20as=20it=20was=20introdu= ced=202=20years=20ago.=0D=0A>>=20>>=20Please=20refer=20to=20https://lore.ke= rnel.org/linux-mm/YkQB6Ah603yPR3qf=40kernel.org/=23t=0D=0A>>=20>>=20=0D=0A>= >=20>>=20>=20But=20you=20never=20provided=20details=20about=20*why*=20you= =20want=20this=20information=20exposed.=0D=0A>>=20>>=20=0D=0A>>=20>>=20For= =20your=20question,=20I'd=20like=20to=20say=20;=0D=0A>>=20>>=20We=20can=20s= ee=20the=20same=20format=20and=20exact=20information=20between=20different= =20version=20of=20kernel=20status.=0D=0A>>=20>>=20=0D=0A>>=20>>=201)=20Inte= rnally=20we=20can=20check=20if=20the=20reserved=20memory=20changes.=0D=0A>>= =20>>=202)=20Externally=20we=20can=20communicate=20between=20chipset=20vend= ors=20and=20OEM,=20with=20a=20same=20format.=0D=0A>>=20>=0D=0A>>=20>Why=20t= he=20existing=20debugfs=20interface=20is=20not=20sufficient?=0D=0A>>=20=0D= =0A>>=20debugfs/memblock/memory=20&=20debugfs/memblock/reserved=20have=20ch= anged=20its=0D=0A>>=20format=20but=20still=20does=20not=20show=20name,=20re= usable,=20kernel=20size.=20=20If=20memory=20is=0D=0A>>=20reserved=20from=20= memblock,=20and=20did=20not=20freed=20back=20to=20memblock.=20Memblock=20do= es=0D=0A>>=20not=20know=20even=20after=20the=20memory=20is=20freed=20to=20s= ystem.=20=20I=20think=20a=20simple=0D=0A>>=20debug=20interface=20is=20neede= d=20to=20easily=20communicate=20with=20others=20or=20compare=0D=0A>>=20diff= erent=20SW=20releases.=0D=0A>=0D=0A>I=20still=20don't=20understand=20what= =20problem=20are=20you=20trying=20to=20solve=20with=20these=0D=0A>patches.= =20=0D=0A=0D=0AI=20think=20we=20need=20a=20common=20API=20to=20easily=20see= =20the=20reserved=20memory=20status.=0D=0AThrough=20MemTotal=20on=20/proc/m= eminfo,=20we=20can=20only=20see=20only=20the=20total=20size=0D=0Aof=20reser= ved=20memory.=20We=20don't=20how=20big=20kernel=20init=20size=20within=20th= e=20the=0D=0Atotal=20size.=20I=20think=20this=20really=20helps=20to=20compa= re=20different=20kernel=20and=0D=0Acommunicate=20with=20others.=0D=0A=0D=0A= I=20think=20the=20debugfs=20API=20or=20early=20boot=20log=20shows=20quite= =20much=20information=0D=0Afor=20the=20reserved=20memory=20information=20de= fined=20in=20device=20tree.=20But=20it=20is=0D=0Adifficult=20to=20see=20aft= er=20boot,=20as=20the=20boot=20log=20already=20was=20removed=20ouf=20of=0D= =0Athe=20kernel=20log=20buffer.=20And=20it=20does=20not=20show=20some=20inf= ormation=20like=20kernel=0D=0Ainit=20size,=20late=20free=20pages.=20AFAIK= =20if=20some=20memblocks=20are=20merged=20to=0D=0Aa=20memblock=20data=20str= ucture,=20the=20debugfs=20memblock=20API=20show=20it=20a=20one=0D=0Amembloc= k=20rather=20than=20showing=20what=20each=20memblock=20request.=0D=0A=0D=0A= BR=0D=0AJaewon=20Kim=0D=0A=0D=0A>=20=0D=0A>--=20=0D=0A>Sincerely=20yours,= =0D=0A>Mike.