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<00d401dc2d0a$18100c20$48302460$@samsung.com> MIME-Version: 1.0 X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQLJ+3fmt+QCibYu+QNx3C6/vuLkWQHN7bNGAg+MCJSypyzxwA== Content-Language: ko X-CMS-MailID: 20250924041709epcas1p487d175805cbfb988b556ae4034995747 X-Msg-Generator: CA CMS-TYPE: 101P cpgsPolicy: CPGSC10-711,Y X-CFilter-Loop: Reflected X-CMS-RootMailID: 20250918082037epcas1p1eb201d3b6d5780c0bff3ba32740ccdcf References: <20250918082023.57381-1-yunji0.kang@samsung.com> <89f237cd-3f86-405a-8f8f-d9cad250ef00@kernel.org> X-Headers-End: 1v1GwP-0002Cu-G8 Subject: Re: [f2fs-dev] [PATCH v2] f2fs: readahead node blocks in F2FS_GET_BLOCK_PRECACHE mode X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: 'Sungjong Seo' , linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 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epsnrtp03.localdomain (Postfix) with ESMTP id 4cWk855sfbz3hhTC; Wed, 24 Sep 2025 04:17:09 +0000 (GMT) Received: from epsmtip2.samsung.com (unknown [182.195.34.31]) by epcas1p4.samsung.com (KnoxPortal) with ESMTPA id 20250924041709epcas1p487d175805cbfb988b556ae4034995747~oHOYbA3Ls1797517975epcas1p4I; Wed, 24 Sep 2025 04:17:09 +0000 (GMT) Received: from yunji0kang01 (unknown [10.253.100.171]) by epsmtip2.samsung.com (KnoxPortal) with ESMTPA id 20250924041709epsmtip21da12bfd155b24fefb4dd00ea7cbbe94~oHOYYAMdS2684526845epsmtip2P; Wed, 24 Sep 2025 04:17:09 +0000 (GMT) From: "Yunji Kang" To: "'Chao Yu'" , Cc: , , "'Sungjong Seo'" , "'Sunmin Jeong'" In-Reply-To: <89f237cd-3f86-405a-8f8f-d9cad250ef00@kernel.org> Subject: RE: [PATCH v2] f2fs: readahead node blocks in F2FS_GET_BLOCK_PRECACHE mode Date: Wed, 24 Sep 2025 13:17:08 +0900 Message-ID: <00d401dc2d0a$18100c20$48302460$@samsung.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQLJ+3fmt+QCibYu+QNx3C6/vuLkWQHN7bNGAg+MCJSypyzxwA== Content-Language: ko X-CMS-MailID: 20250924041709epcas1p487d175805cbfb988b556ae4034995747 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" CMS-TYPE: 101P cpgsPolicy: CPGSC10-711,Y X-CFilter-Loop: Reflected X-CMS-RootMailID: 20250918082037epcas1p1eb201d3b6d5780c0bff3ba32740ccdcf References: <20250918082023.57381-1-yunji0.kang@samsung.com> <89f237cd-3f86-405a-8f8f-d9cad250ef00@kernel.org> > > In f2fs_precache_extents(), For large files, It requires reading many > > node blocks. Instead of reading each node block with synchronous I/O, > > this patch applies readahead so that node blocks can be fetched in > > advance. > > > > It reduces the overhead of repeated sync reads and improves efficiency > > when precaching extents of large files. > > > > I created a file with the same largest extent and executed the test. > > For this experiment, I set the file's largest extent with an offset of > > 0 and a size of 1GB. I configured the remaining area with 100MB extents= . > > > > 5GB test file: > > dd if=3D/dev/urandom of=3Dtest1 bs=3D1m count=3D5120 cp test1 test2 fsy= nc > > test1 dd if=3Dtest1 of=3Dtest2 bs=3D1m skip=3D1024 seek=3D1024 count=3D= 100 > > conv=3Dnotrunc dd if=3Dtest1 of=3Dtest2 bs=3D1m skip=3D1224 seek=3D1224= count=3D100 > > conv=3Dnotrunc ... > > dd if=3Dtest1 of=3Dtest2 bs=3D1m skip=3D5024 seek=3D5024 count=3D100 co= nv=3Dnotrunc > > reboot > > > > I also created 10GB and 20GB files with large extents using the same > > method. > > > > ioctl(F2FS_IOC_PRECACHE_EXTENTS) test results are as follows: > > +-----------+---------+---------+-----------+ > > =7C File size =7C Before =7C After =7C Reduction =7C > > +-----------+---------+---------+-----------+ > > =7C 5GB =7C 101.8ms =7C 72.1ms =7C 29.2% =7C > > =7C 10GB =7C 222.9ms =7C 149.5ms =7C 32.9% =7C > > =7C 20GB =7C 446.2ms =7C 276.3ms =7C 38.1% =7C > > +-----------+---------+---------+-----------+ >=20 > Yunji, >=20 > Will we gain better performance if we readahead more node pages w/ > sychronous request for precache extent case? Have you tried that? >=20 > Thanks, >=20 Does =E2=80=9Creadahead=20more=20node=20pages=E2=80=9D=20mean=20removing=20= this=20condition?=0D=0A=22=20offset=5Bi=20-=201=5D=20%=20MAX_RA_NODE=20=3D= =3D=200=20=22=0D=0A=0D=0AI=20originally=20added=20the=20condition=20to=20pr= event=20unnecessary=20readahead=20requests,=20=0D=0Abut=20it=20seems=20this= =20condition=20was=20actually=20blocking=20valid=20readahead=20as=20well.= =0D=0A=0D=0AAfter=20removing=20the=20condition=20and=20running=20tests,=20= =0D=0AI=20confirmed=20that=20more=20readahead=20node=20pages=20are=20being= =20issued.=0D=0A=0D=0AI=E2=80=99ll=20share=20the=20test=20results=20along= =20with=20the=20improved=20patch.=0D=0A=0D=0AThanks,=0D=0A=0D=0A>=20>=20Tes= ted=20on=20a=20256GB=20mobile=20device=20with=20an=20SM8750=20chipset.=0D= =0A>=20>=0D=0A>=20>=20Reviewed-by:=20Sungjong=20Seo=20=0D=0A>=20>=20Reviewed-by:=20Sunmin=20Jeong=20=0D=0A>=20>=20Signed-off-by:=20Yunji=20Kang=20=0D=0A>=20>=20---=0D=0A>=20>=20v2:=0D=0A>=20>=20=20-=20Modify=20the=20read= ahead=20condition=20check=20routine=20for=20better=20code=0D=0A>=20>=20read= ability.=0D=0A>=20>=20=20-=20Update=20the=20title=20from=20'node=20block'= =20to=20'node=20blocks'.=0D=0A>=20>=0D=0A>=20>=20=20fs/f2fs/data.c=20=7C=20= 3=20+++=0D=0A>=20>=20=20fs/f2fs/f2fs.h=20=7C=201=20+=0D=0A>=20>=20=20fs/f2f= s/node.c=20=7C=205=20++++-=0D=0A>=20>=20=203=20files=20changed,=208=20inser= tions(+),=201=20deletion(-)=0D=0A>=20>=0D=0A>=20>=20diff=20--git=20a/fs/f2f= s/data.c=20b/fs/f2fs/data.c=20index=0D=0A>=20>=207961e0ddfca3..ab3117e3b24a= =20100644=0D=0A>=20>=20---=20a/fs/f2fs/data.c=0D=0A>=20>=20+++=20b/fs/f2fs/= data.c=0D=0A>=20>=20=40=40=20-1572,6=20+1572,9=20=40=40=20int=20f2fs_map_bl= ocks(struct=20inode=20*inode,=20struct=0D=0A>=20f2fs_map_blocks=20*map,=20i= nt=20flag)=0D=0A>=20>=20=20=09pgofs=20=3D=09(pgoff_t)map->m_lblk;=0D=0A>=20= >=20=20=09end=20=3D=20pgofs=20+=20maxblocks;=0D=0A>=20>=0D=0A>=20>=20+=09if= =20(flag=20=3D=3D=20F2FS_GET_BLOCK_PRECACHE)=0D=0A>=20>=20+=09=09mode=20=3D= =20LOOKUP_NODE_PRECACHE;=0D=0A>=20>=20+=0D=0A>=20>=20=20next_dnode:=0D=0A>= =20>=20=20=09if=20(map->m_may_create)=20=7B=0D=0A>=20>=20=20=09=09if=20(f2f= s_lfs_mode(sbi))=0D=0A>=20>=20diff=20--git=20a/fs/f2fs/f2fs.h=20b/fs/f2fs/f= 2fs.h=20index=0D=0A>=20>=209d3bc9633c1d..3ce41528d48e=20100644=0D=0A>=20>= =20---=20a/fs/f2fs/f2fs.h=0D=0A>=20>=20+++=20b/fs/f2fs/f2fs.h=0D=0A>=20>=20= =40=40=20-651,6=20+651,7=20=40=40=20enum=20=7B=0D=0A>=20>=20=20=09=09=09=09= =09=20*=20look=20up=20a=20node=20with=20readahead=20called=0D=0A>=20>=20=20= =09=09=09=09=09=20*=20by=20get_data_block.=0D=0A>=20>=20=20=09=09=09=09=09= =20*/=0D=0A>=20>=20+=09LOOKUP_NODE_PRECACHE,=09=09/*=20look=20up=20a=20node= =20for=0D=0A>=20F2FS_GET_BLOCK_PRECACHE=20*/=0D=0A>=20>=20=20=7D;=0D=0A>=20= >=0D=0A>=20>=20=20=23define=20DEFAULT_RETRY_IO_COUNT=098=09/*=20maximum=20r= etry=20read=20IO=20or=20flush=0D=0A>=20count=20*/=0D=0A>=20>=20diff=20--git= =20a/fs/f2fs/node.c=20b/fs/f2fs/node.c=20index=0D=0A>=20>=204254db453b2d..d= 4bf3ce715c5=20100644=0D=0A>=20>=20---=20a/fs/f2fs/node.c=0D=0A>=20>=20+++= =20b/fs/f2fs/node.c=0D=0A>=20>=20=40=40=20-860,7=20+860,10=20=40=40=20int= =20f2fs_get_dnode_of_data(struct=20dnode_of_data=20*dn,=0D=0A>=20pgoff_t=20= index,=20int=20mode)=0D=0A>=20>=20=20=09=09=09set_nid(parent,=20offset=5Bi= =20-=201=5D,=20nids=5Bi=5D,=20i=20=3D=3D=201);=0D=0A>=20>=20=20=09=09=09f2f= s_alloc_nid_done(sbi,=20nids=5Bi=5D);=0D=0A>=20>=20=20=09=09=09done=20=3D= =20true;=0D=0A>=20>=20-=09=09=7D=20else=20if=20(mode=20=3D=3D=20LOOKUP_NODE= _RA=20&&=20i=20=3D=3D=20level=20&&=20level=20>=201)=0D=0A>=20=7B=0D=0A>=20>= =20+=09=09=7D=20else=20if=20((i=20=3D=3D=20level=20&&=20level=20>=201)=20&&= =0D=0A>=20>=20+=09=09=09=09(mode=20=3D=3D=20LOOKUP_NODE_RA=20=7C=7C=0D=0A>= =20>=20+=09=09=09=09(mode=20=3D=3D=20LOOKUP_NODE_PRECACHE=20&&=0D=0A>=20>= =20+=09=09=09=09offset=5Bi=20-=201=5D=20%=20MAX_RA_NODE=20=3D=3D=200)))=20= =7B=0D=0A>=20>=20=20=09=09=09nfolio=5Bi=5D=20=3D=20f2fs_get_node_folio_ra(p= arent,=20offset=5Bi=20-=0D=0A>=201=5D);=0D=0A>=20>=20=20=09=09=09if=20(IS_E= RR(nfolio=5Bi=5D))=20=7B=0D=0A>=20>=20=20=09=09=09=09err=20=3D=20PTR_ERR(nf= olio=5Bi=5D);=0D=0A=0D=0A=0D=0A