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Vlastimil Babka , Mel Gorman , Eric Ren , Mike Rapoport , Oscar Salvador , Christophe Leroy , Andrew Morton , kernel test robot , Qian Cai Subject: Re: [PATCH v11 3/6] mm: make alloc_contig_range work at pageblock granularity Date: Wed, 25 May 2022 17:11:12 -0400 X-Mailer: MailMate (1.14r5870) Message-ID: In-Reply-To: References: <20220425143118.2850746-1-zi.yan@sent.com> <20220425143118.2850746-4-zi.yan@sent.com> <23A7297E-6C84-4138-A9FE-3598234004E6@nvidia.com> <180aaa57-28d8-30f0-e843-ea52e3a180a8@gmail.com> Content-Type: multipart/signed; boundary="=_MailMate_BFB74625-6981-4BD3-92F7-8F4B3436DBEA_="; micalg=pgp-sha512; protocol="application/pgp-signature" X-ClientProxiedBy: BL1PR13CA0294.namprd13.prod.outlook.com (2603:10b6:208:2bc::29) To DS7PR12MB5744.namprd12.prod.outlook.com (2603:10b6:8:73::18) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 8f5fa0f6-887e-464f-905b-08da3e931a96 X-MS-TrafficTypeDiagnostic: IA1PR12MB6234:EE_ 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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: --=_MailMate_BFB74625-6981-4BD3-92F7-8F4B3436DBEA_= Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On 25 May 2022, at 17:03, Doug Berger wrote: > On 5/25/2022 10:53 AM, Zi Yan wrote: >> On 25 May 2022, at 13:41, Doug Berger wrote: >> >>> I am seeing some free memory accounting problems with linux-next that= I have bisected to this commit (i.e. b2c9e2fbba32 ("mm: make alloc_conti= g_range work at pageblock granularity"). >>> >>> On an arm64 SMP platform with 4GB total memory and the default 16MB d= efault CMA pool, I am seeing the following after boot with a sysrq Show M= emory (e.g. 'echo m > /proc/sysrq-trigger'): >>> >>> [ 16.015906] sysrq: Show Memory >>> [ 16.019039] Mem-Info: >>> [ 16.021348] active_anon:14604 inactive_anon:919 isolated_anon:0 >>> [ 16.021348] active_file:0 inactive_file:0 isolated_file:0 >>> [ 16.021348] unevictable:0 dirty:0 writeback:0 >>> [ 16.021348] slab_reclaimable:3662 slab_unreclaimable:3333 >>> [ 16.021348] mapped:928 shmem:15146 pagetables:63 bounce:0 >>> [ 16.021348] kernel_misc_reclaimable:0 >>> [ 16.021348] free:976766 free_pcp:991 free_cma:7017 >>> [ 16.056937] Node 0 active_anon:58416kB inactive_anon:3676kB active= _file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(f= ile):0kB mapped:3712kB dirty:0kB writeback:0kB shmem:60584kB writeback_tm= p:0kB kernel_stack:1200kB pagetables:252kB all_unreclaimable? no >>> [ 16.081526] DMA free:3041036kB boost:0kB min:6036kB low:9044kB hig= h:12052kB reserved_highatomic:0KB active_anon:0kB inactive_anon:0kB activ= e_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:314= 5728kB managed:3029992kB mlocked:0kB bounce:0kB free_pcp:636kB local_pcp:= 0kB free_cma:28068kB >>> [ 16.108650] lowmem_reserve[]: 0 0 944 944 >>> [ 16.112746] Normal free:866028kB boost:0kB min:1936kB low:2900kB h= igh:3864kB reserved_highatomic:0KB active_anon:58416kB inactive_anon:3676= kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB pre= sent:1048576kB managed:967352kB mlocked:0kB bounce:0kB free_pcp:3328kB lo= cal_pcp:864kB free_cma:0kB >>> [ 16.140393] lowmem_reserve[]: 0 0 0 0 >>> [ 16.144133] DMA: 7*4kB (UMC) 4*8kB (M) 3*16kB (M) 3*32kB (MC) 5*64= kB (M) 4*128kB (MC) 5*256kB (UMC) 7*512kB (UM) 5*1024kB (UM) 9*2048kB (UM= C) 732*4096kB (MC) =3D 3027724kB >>> [ 16.159609] Normal: 149*4kB (UM) 95*8kB (UME) 26*16kB (UME) 8*32kB= (ME) 2*64kB (UE) 1*128kB (M) 2*256kB (ME) 2*512kB (ME) 2*1024kB (UM) 0*2= 048kB 210*4096kB (M) =3D 866028kB >>> [ 16.175165] Node 0 hugepages_total=3D0 hugepages_free=3D0 hugepage= s_surp=3D0 hugepages_size=3D1048576kB >>> [ 16.183937] Node 0 hugepages_total=3D0 hugepages_free=3D0 hugepage= s_surp=3D0 hugepages_size=3D32768kB >>> [ 16.192533] Node 0 hugepages_total=3D0 hugepages_free=3D0 hugepage= s_surp=3D0 hugepages_size=3D2048kB >>> [ 16.201040] Node 0 hugepages_total=3D0 hugepages_free=3D0 hugepage= s_surp=3D0 hugepages_size=3D64kB >>> [ 16.209374] 15146 total pagecache pages >>> [ 16.213246] 0 pages in swap cache >>> [ 16.216595] Swap cache stats: add 0, delete 0, find 0/0 >>> [ 16.221867] Free swap =3D 0kB >>> [ 16.224780] Total swap =3D 0kB >>> [ 16.227693] 1048576 pages RAM >>> [ 16.230694] 0 pages HighMem/MovableOnly >>> [ 16.234564] 49240 pages reserved >>> [ 16.237825] 4096 pages cma reserved >>> >>> Some anomolies in the above are: >>> free_cma:7017 with only 4096 pages cma reserved >>> DMA free:3041036kB with only managed:3029992kB >>> >>> I'm not sure what is going on here, but I am suspicious of split_free= _page() since del_page_from_free_list doesn't affect migrate_type account= ing, but __free_one_page() can. >>> Also PageBuddy(page) is being checked without zone->lock in isolate_s= ingle_pageblock(). >>> >>> Please investigate this as well. >> >> >> Can you try this patch https://lore.kernel.org/linux-mm/20220524194756= =2E1698351-1-zi.yan@sent.com/ >> and see if it fixes the issue? >> >> Thanks. >> > The last hunk didn't apply directly to this commit, but I was able to a= pply the patch to linux-next/master with no improvement to the free memor= y accounting (actually anecdotaly worse): > > [ 6.236828] sysrq: Show Memory > [ 6.239973] Mem-Info: > [ 6.242290] active_anon:14594 inactive_anon:924 isolated_anon:0 > [ 6.242290] active_file:0 inactive_file:0 isolated_file:0 > [ 6.242290] unevictable:0 dirty:0 writeback:0 > [ 6.242290] slab_reclaimable:3671 slab_unreclaimable:3575 > [ 6.242290] mapped:935 shmem:15147 pagetables:63 bounce:0 > [ 6.242290] kernel_misc_reclaimable:0 > [ 6.242290] free:1059009 free_pcp:1067 free_cma:90112 > [ 6.278048] Node 0 active_anon:58376kB inactive_anon:3844kB active_f= ile:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(fil= e):0kB mapped:3740kB dirty:0kB writeback:0kB shmem:60588kB writeback_tmp:= 0kB kernel_stack:1216kB pagetables:252kB all_unreclaimable? no > [ 6.279422] arm-scmi brcm_scmi@0: timed out in resp(caller: scmi_per= f_level_set+0xe0/0x110) > [ 6.302501] DMA free:3372200kB boost:0kB min:6032kB low:9040kB high:= 12048kB reserved_highatomic:0KB active_anon:0kB inactive_anon:0kB active_= file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:31457= 28kB managed:3029800kB mlocked:0kB bounce:0kB free_pcp:636kB local_pcp:0k= B free_cma:360448kB > [ 6.302515] lowmem_reserve[]: 0 0 944 > [ 6.310894] cpufreq: __target_index: Failed to change cpu frequency:= -110 > [ 6.337920] 944 > [ 6.337925] Normal free:863584kB boost:0kB min:1940kB low:2904kB hig= h:3868kB reserved_highatomic:0KB active_anon:58376kB inactive_anon:3896kB= active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB prese= nt:1048576kB managed:967352kB mlocked:0kB bounce:0kB free_pcp:3492kB loca= l_pcp:828kB free_cma:0kB > [ 6.377782] lowmem_reserve[]: 0 0 0 0 > [ 6.381461] DMA: 4*4kB (UM) 5*8kB (M) 3*16kB (M) 2*32kB (M) 6*64kB (= M) 5*128kB (M) 6*256kB (UM) 5*512kB (UM) 4*1024kB (M) 10*2048kB (UMC) 732= *4096kB (MC) =3D 3028136kB > [ 6.396324] Normal: 84*4kB (U) 94*8kB (UM) 260*16kB (UME) 149*32kB (= UM) 99*64kB (UME) 39*128kB (UM) 12*256kB (U) 3*512kB (UME) 2*1024kB (UM) = 0*2048kB 204*4096kB (M) =3D 863584kB > [ 6.412054] Node 0 hugepages_total=3D0 hugepages_free=3D0 hugepages_= surp=3D0 hugepages_size=3D1048576kB > [ 6.420770] Node 0 hugepages_total=3D0 hugepages_free=3D0 hugepages_= surp=3D0 hugepages_size=3D32768kB > [ 6.429312] Node 0 hugepages_total=3D0 hugepages_free=3D0 hugepages_= surp=3D0 hugepages_size=3D2048kB > [ 6.437767] Node 0 hugepages_total=3D0 hugepages_free=3D0 hugepages_= surp=3D0 hugepages_size=3D64kB > [ 6.446047] 15147 total pagecache pages > [ 6.449890] 0 pages in swap cache > [ 6.453210] Swap cache stats: add 0, delete 0, find 0/0 > [ 6.458445] Free swap =3D 0kB > [ 6.461331] Total swap =3D 0kB > [ 6.464217] 1048576 pages RAM > [ 6.467190] 0 pages HighMem/MovableOnly > [ 6.471032] 49288 pages reserved > [ 6.474267] 4096 pages cma reserved > > Regards, > Doug I will look into it. Thanks for reporting it. -- Best Regards, Yan, Zi --=_MailMate_BFB74625-6981-4BD3-92F7-8F4B3436DBEA_= Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQJDBAEBCgAtFiEE6rR4j8RuQ2XmaZol4n+egRQHKFQFAmKOm3APHHppeUBudmlk aWEuY29tAAoJEOJ/noEUByhUZ78P/RlGoiYOmoji0K2uO1oiN4eD5hgsxTXZXcjB IyqZvfCbKF+SAoZ+cItNxyZQeqZBIXHga7Yy3YABCoqhgBMxc22/+LNamGETn47V zHXf72IJW9zLk723JOj3QsxLVt9HTZmyCRP/N0Puuu5Nh+kl45kSNfgPB8Re3CnR cBDVmbXPJ3zo/70wroBgiOJh5maf0XxQXLMY4uFxTHdpzJGy6/dR1YbSfxLsg1xr tJa9viSsFqS3HCFQG4mGpTr+RKktqP20H8cbZvB4j00pa8vvKHw5OhgodofzRuu8 dW7Q02pqVoq8CQR0wX1/lrIBEpIOn/xhDjHWdvOra7aZoaPgh0di4vkrC00qshR3 8yWaBxXjg/C1Wk8Xk/W7Osh46sJEQsTZbdWmYfWAc1dBLbgx6pPu/Qs0GHQ3pWrz 0h3xztBUr+oQkvK5072cytnyY9Ov+AcM1Yo9LaAl0dENixDT9cZcfUbJH54eVzOs Gm/CPKhUfrjoHPULA2iu6yWtrQsvnhlWFalGs4Fju5va1hoElUWFKH/AGaYFDuYt 9OHLBkmVGJA2MlwGB84rg7Riff9fuhLbp9Pj4yMRzVs1bi0szvsEWLy9jOjZyiyP lv8sRD2Fhkm8izNaszctF5QlRETUb+d4QuKTCTvJGbx4gGmir+D5tWG/MU19HuKH hpJXvkDG =VPH/ -----END PGP SIGNATURE----- --=_MailMate_BFB74625-6981-4BD3-92F7-8F4B3436DBEA_=--