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Date: Tue, 7 Feb 2017 19:30:54 +0900
From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To: bfoster@...hat.com
Cc: mhocko@...nel.org, david@...morbit.com, dchinner@...hat.com,
hch@....de, mgorman@...e.de, viro@...IV.linux.org.uk,
linux-mm@...ck.org, hannes@...xchg.org,
linux-kernel@...r.kernel.org, darrick.wong@...cle.com,
linux-xfs@...r.kernel.org
Subject: Re: [RFC PATCH 1/2] mm, vmscan: account the number of isolated pages per zone
Brian Foster wrote:
> > The workload is to write to a single file on XFS from 10 processes demonstrated at
> > http://lkml.kernel.org/r/201512052133.IAE00551.LSOQFtMFFVOHOJ@I-love.SAKURA.ne.jp
> > using "while :; do ./oom-write; done" loop on a VM with 4CPUs / 2048MB RAM.
> > With this XFS_FILBLKS_MIN() change applied, I no longer hit assertion failures.
> >
>
> Thanks for testing. Well, that's an interesting workload. I couldn't
> reproduce on a few quick tries in a similarly configured vm.
It takes 10 to 15 minutes. Maybe some size threshold involved?
> /tmp/file _is_ on an XFS filesystem in your test, correct? If so and if
> you still have the output file from a test that reproduced, could you
> get the 'xfs_io -c "fiemap -v" <file>' output?
Here it is.
[ 720.199748] 0 pages HighMem/MovableOnly
[ 720.199749] 150524 pages reserved
[ 720.199749] 0 pages cma reserved
[ 720.199750] 0 pages hwpoisoned
[ 722.187335] XFS: Assertion failed: oldlen > newlen, file: fs/xfs/libxfs/xfs_bmap.c, line: 2867
[ 722.201784] ------------[ cut here ]------------
[ 722.205940] WARNING: CPU: 0 PID: 4877 at fs/xfs/xfs_message.c:105 asswarn+0x33/0x40 [xfs]
[ 722.212333] Modules linked in: nf_conntrack_netbios_ns nf_conntrack_broadcast ip6t_rpfilter ipt_REJECT nf_reject_ipv4 ip6t_REJECT nf_reject_ipv6 xt_conntrack ip_set nfnetlink ebtable_nat ebtable_broute bridge stp llc ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_raw iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_raw ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter coretemp crct10dif_pclmul vmw_vsock_vmci_transport crc32_pclmul ghash_clmulni_intel vsock aesni_intel crypto_simd cryptd glue_helper ppdev vmw_balloon pcspkr sg parport_pc i2c_piix4 shpchp vmw_vmci parport ip_tables xfs libcrc32c sd_mod sr_mod cdrom ata_generic pata_acpi crc32c_intel serio_raw vmwgfx drm_kms_helper syscopyarea sysfillrect
[ 722.243207] sysimgblt fb_sys_fops mptspi scsi_transport_spi ata_piix ahci ttm mptscsih libahci drm libata mptbase e1000 i2c_core
[ 722.247704] CPU: 0 PID: 4877 Comm: write Not tainted 4.10.0-rc6-next-20170202 #498
[ 722.250612] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/02/2015
[ 722.254089] Call Trace:
[ 722.255751] dump_stack+0x85/0xc9
[ 722.257650] __warn+0xd1/0xf0
[ 722.259420] warn_slowpath_null+0x1d/0x20
[ 722.261434] asswarn+0x33/0x40 [xfs]
[ 722.263356] xfs_bmap_add_extent_hole_delay+0xb7f/0xdf0 [xfs]
[ 722.265695] xfs_bmapi_reserve_delalloc+0x297/0x440 [xfs]
[ 722.267792] ? xfs_ilock+0x1c9/0x360 [xfs]
[ 722.269559] xfs_file_iomap_begin+0x880/0x1140 [xfs]
[ 722.271606] ? iomap_write_end+0x80/0x80
[ 722.273377] iomap_apply+0x6c/0x130
[ 722.274969] iomap_file_buffered_write+0x68/0xa0
[ 722.276702] ? iomap_write_end+0x80/0x80
[ 722.278311] xfs_file_buffered_aio_write+0x132/0x390 [xfs]
[ 722.280394] ? _raw_spin_unlock+0x27/0x40
[ 722.282247] xfs_file_write_iter+0x90/0x130 [xfs]
[ 722.284257] __vfs_write+0xe5/0x140
[ 722.285924] vfs_write+0xc7/0x1f0
[ 722.287536] ? syscall_trace_enter+0x1d0/0x380
[ 722.289490] SyS_write+0x58/0xc0
[ 722.291025] do_int80_syscall_32+0x6c/0x1f0
[ 722.292671] entry_INT80_compat+0x38/0x50
[ 722.294298] RIP: 0023:0x8048076
[ 722.295684] RSP: 002b:00000000ffedf840 EFLAGS: 00000202 ORIG_RAX: 0000000000000004
[ 722.298075] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000008048000
[ 722.300516] RDX: 0000000000001000 RSI: 0000000000000000 RDI: 0000000000000000
[ 722.302902] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[ 722.305278] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[ 722.307567] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 722.309792] ---[ end trace 5b7012eeb84093b7 ]---
[ 732.650867] oom_reaper: reaped process 4876 (oom-write), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB
# ls -l /tmp/file
-rw------- 1 kumaneko kumaneko 43426648064 Feb 7 19:25 /tmp/file
# xfs_io -c "fiemap -v" /tmp/file
/tmp/file:
EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS
0: [0..262015]: 358739712..359001727 262016 0x0
1: [262016..524159]: 367651920..367914063 262144 0x0
2: [524160..1048447]: 385063864..385588151 524288 0x0
3: [1048448..1238031]: 463702512..463892095 189584 0x0
4: [1238032..3335167]: 448234520..450331655 2097136 0x0
5: [3335168..4769775]: 36165320..37599927 1434608 0x0
6: [4769776..6897175]: 31677984..33805383 2127400 0x0
7: [6897176..15285759]: 450331656..458720239 8388584 0x0
8: [15285760..18520255]: 237497528..240732023 3234496 0x0
9: [18520256..21063607]: 229750248..232293599 2543352 0x0
10: [21063608..25257855]: 240732024..244926271 4194248 0x0
11: [25257856..29452159]: 179523440..183717743 4194304 0x0
12: [29452160..30380031]: 171930952..172858823 927872 0x0
13: [30380032..31428607]: 185220160..186268735 1048576 0x0
14: [31428608..32667751]: 232293600..233532743 1239144 0x0
15: [32667752..38474351]: 172858824..178665423 5806600 0x0
16: [38474352..39157119]: 188137184..188819951 682768 0x0
17: [39157120..40205695]: 234837584..235886159 1048576 0x0
18: [40205696..42302847]: 33805384..35902535 2097152 0x0
19: [42302848..44188591]: 37599928..39485671 1885744 0x0
20: [44188592..45112703]: 446735416..447659527 924112 0x0
21: [45112704..45436343]: 445337184..445660823 323640 0x0
22: [45436344..45960575]: 447659528..448183759 524232 0x0
23: [45960576..46484863]: 463892096..464416383 524288 0x0
24: [46484864..47533439]: 445660824..446709399 1048576 0x0
25: [47533440..48541959]: 233532744..234541263 1008520 0x0
26: [48541960..49294175]: 523533736..524285951 752216 0x0
27: [49294176..49630591]: 376080552..376416967 336416 0x0
28: [49630592..50154879]: 129846752..130371039 524288 0x0
29: [50154880..50844383]: 244926272..245615775 689504 0x0
30: [50844384..51203455]: 250812112..251171183 359072 0x0
31: [51203456..51727743]: 259555424..260079711 524288 0x0
32: [51727744..52295239]: 187350752..187918247 567496 0x0
33: [52295240..52776319]: 188819952..189301031 481080 0x0
34: [52776320..53300607]: 206841040..207365327 524288 0x0
35: [53300608..53824775]: 386221504..386745671 524168 0x0
36: [53824776..54348935]: 113736928..114261087 524160 0x0
37: [54348936..54854007]: 228911704..229416775 505072 0x0
38: [54854008..54905983]: 228760200..228812175 51976 0x0
39: [54905984..54971519]: 228597920..228663455 65536 0x0
40: [54971520..55364735]: 178998696..179391911 393216 0x0
41: [55364736..55868119]: 392669176..393172559 503384 0x0
42: [55868120..56370663]: 382896800..383399343 502544 0x0
43: [56370664..56836311]: 464416384..464882031 465648 0x0
44: [56836312..57085055]: 458720240..458968983 248744 0x0
45: [57085056..57548743]: 92768112..93231799 463688 0x0
46: [57548744..57871487]: 102724384..103047127 322744 0x0
47: [57871488..58304623]: 124278664..124711799 433136 0x0
48: [58304624..58526847]: 124712024..124934247 222224 0x0
49: [58526848..58788991]: 125635832..125897975 262144 0x0
50: [58788992..59203767]: 508031384..508446159 414776 0x0
51: [59203768..59602871]: 109812624..110211727 399104 0x0
52: [59602872..59992183]: 385736856..386126167 389312 0x0
53: [59992184..60381311]: 237108384..237497511 389128 0x0
54: [60381312..60756863]: 506355968..506731519 375552 0x0
55: [60756864..61127487]: 186268736..186639359 370624 0x0
56: [61127488..61490767]: 112848304..113211583 363280 0x0
57: [61490768..61541503]: 113214200..113264935 50736 0x0
58: [61541504..61904775]: 112246776..112610047 363272 0x0
59: [61904776..62246247]: 106328512..106669983 341472 0x0
60: [62246248..62571991]: 126075640..126401383 325744 0x0
61: [62571992..62895759]: 108921744..109245511 323768 0x0
62: [62895760..63219159]: 380153016..380476415 323400 0x0
63: [63219160..63442047]: 381056248..381279135 222888 0x0
64: [63442048..63704191]: 379768072..380030215 262144 0x0
65: [63704192..64026847]: 108328888..108651543 322656 0x0
66: [64026848..64342415]: 251387232..251702799 315568 0x0
67: [64342416..64651407]: 183717744..184026735 308992 0x0
68: [64651408..64947983]: 384092440..384389015 296576 0x0
69: [64947984..65145983]: 381775560..381973559 198000 0x0
70: [65145984..65408127]: 186914504..187176647 262144 0x0
71: [65408128..65447943]: 125328232..125368047 39816 0x0
72: [65447944..65690599]: 372579112..372821767 242656 0x0
73: [65690600..65929863]: 130429664..130668927 239264 0x0
74: [65929864..66168935]: 120951784..121190855 239072 0x0
75: [66168936..66402279]: 372845976..373079319 233344 0x0
76: [66402280..66633199]: 113372616..113603535 230920 0x0
77: [66633200..66859943]: 115982256..116208999 226744 0x0
78: [66859944..67082127]: 127187600..127409783 222184 0x0
79: [67082128..67217407]: 127636680..127771959 135280 0x0
80: [67217408..67280095]: 129510736..129573423 62688 0x0
81: [67280096..67499063]: 119220288..119439255 218968 0x0
82: [67499064..67717935]: 507320248..507539119 218872 0x0
83: [67717936..67936119]: 129292544..129510727 218184 0x0
84: [67936120..68153903]: 125368048..125585831 217784 0x0
85: [68153904..68370703]: 117784232..118001031 216800 0x0
86: [68370704..68586039]: 121997008..122212343 215336 0x0
87: [68586040..68798855]: 379191840..379404655 212816 0x0
88: [68798856..68983935]: 378690808..378875887 185080 0x0
89: [68983936..69196727]: 90790848..91003639 212792 0x0
90: [69196728..69409287]: 123091672..123304231 212560 0x0
91: [69409288..69621503]: 377436856..377649071 212216 0x0
92: [69621504..69828847]: 128990088..129197431 207344 0x0
93: [69828848..70035391]: 497270968..497477511 206544 0x0
94: [70035392..70241111]: 391898048..392103767 205720 0x0
95: [70241112..70446207]: 260716672..260921767 205096 0x0
96: [70446208..70507647]: 260079712..260141151 61440 0x0
97: [70507648..70704255]: 245836040..246032647 196608 0x0
98: [70704256..70906591]: 107009096..107211431 202336 0x0
99: [70906592..71108807]: 389471224..389673439 202216 0x0
100: [71108808..71309703]: 224305904..224506799 200896 0x0
101: [71309704..71509487]: 388524632..388724415 199784 0x0
102: [71509488..71707119]: 87983688..88181319 197632 0x0
103: [71707120..71903015]: 236195680..236391575 195896 0x0
104: [71903016..72098791]: 389000248..389196023 195776 0x0
105: [72098792..72294471]: 386931872..387127551 195680 0x0
106: [72294472..72342655]: 387127560..387175743 48184 0x0
107: [72342656..72408191]: 388031464..388096999 65536 0x0
108: [72408192..72539263]: 388194472..388325543 131072 0x0
109: [72539264..72562039]: 369903992..369926767 22776 0x0
110: [72562040..72753639]: 506916880..507108479 191600 0x0
111: [72753640..72945143]: 360577376..360768879 191504 0x0
112: [72945144..73136575]: 246426760..246618191 191432 0x0
113: [73136576..73326047]: 116629288..116818759 189472 0x0
114: [73326048..73515047]: 392203096..392392095 189000 0x0
115: [73515048..73699967]: 223549160..223734079 184920 0x0
116: [73699968..73883879]: 118860856..119044767 183912 0x0
117: [73883880..74067175]: 506143208..506326503 183296 0x0
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155: [80173584..80331295]: 362940272..363097983 157712 0x0
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186: [84671976..84810807]: 109637664..109776495 138832 0x0
187: [84810808..84901119]: 110211736..110302047 90312 0x1
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