Le 11.08.2006 01:20, Laurent Riffard a écrit :
>
> Le 10.08.2006 11:19, Andrew Morton a écrit :
>> On Thu, 10 Aug 2006 11:04:36 +0200
>> Laurent Riffard <[email protected]> wrote:
>>
>>> Le 06.08.2006 12:08, Andrew Morton a écrit :
>>>> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.18-rc3/26.18-rc3-mm2/
>>> Hello,
>>>
>>> On my system, a cron runs every day to check the integrity of
>>> installed RPMS, it runs "rpm -v" on each package, which computes
>>> MD5 hash for each installed file and compares this result, the file
>>> size and modification time with values stored in RPM database.
>>>
>>> This is the workload. Since 2.6.18-rc3-mm2, this processus eats
>>> all the memory and triggers OOM.
>>>
>>> On my system, "free -t" output normally looks like this ("cached" value
>>> is about half of RAM):
>>> # free -t
>>> total used free shared buffers cached
>>> Mem: 515032 508512 6520 0 22992 256032
>>> -/+ buffers/cache: 229488 285544
>>> Swap: 1116428 324 1116104
>>> Total: 1631460 508836 1122624
>>>
>>> After the rpm database check, "free -t" says:
>>> total used free shared buffers cached
>>> Mem: 515032 507124 7908 0 8132 398296
>>> -/+ buffers/cache: 100696 414336
>>> Swap: 1116428 34896 1081532
>>> Total: 1631460 542020 1089440
>>>
>>> And the value of "cached" won't decrease.
>>>
>> Yes, I was just trying to reproduce this. No luck so far. Will try your
>> .config tomorrow.
>>
>> It would be interesting to try disabling CONFIG_ADAPTIVE_READAHEAD -
>> perhaps that got broken.
>
> I just try it: when CONFIG_ADAPTIVE_READAHEAD is disabled,
> /proc/meminfo:Cached is stable and never exceeded 230.000, the system
> didn't even try to swap.
>
> $ cat /proc/meminfo # taken a few minutes after the end of rpm -V
> MemTotal: 515032 kB
> MemFree: 6612 kB
> Buffers: 42212 kB
> Cached: 182236 kB
> SwapCached: 0 kB
> Active: 376256 kB
> Inactive: 75468 kB
> SwapTotal: 1116428 kB
> SwapFree: 1116428 kB
> Dirty: 272 kB
> Writeback: 0 kB
> AnonPages: 227260 kB
> Mapped: 62812 kB
> Slab: 44968 kB
> PageTables: 2152 kB
> NFS Unstable: 0 kB
> Bounce: 0 kB
> CommitLimit: 1373944 kB
> Committed_AS: 637400 kB
> VmallocTotal: 515796 kB
> VmallocUsed: 6916 kB
> VmallocChunk: 508760 kB
I enabled CONFIG_ADAPTIVE_READAHEAD again, I applied all the hot-fixes
and I ran another test with "rpm -qaV". Please see attached vmstat.log
(output of vmstat 5).
>> Also, are you able to determine whether the problem is specific to `rpm
>> -V'? Are you able to make the leak trigger using other filesystem
>> workloads?
>
> Will try...
No luck. For example, "find /usr -type f -print0 | xargs -0 cat > /dev/null"
does not trigger the problem.
You can find the strace output of "rpm -qaV" at
http://laurent.riffard.free.fr/2.6.18-rc3-mm2/rpm-qaV-strace.log
(427 kB). Maybe you can guess what's specific...
FWIW, here are the relevant parts of my FS configuration:
# df
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vglinux1-lvroot
249M 210M 31M 88% /
/dev/mapper/vglinux1-lvusr
3.5G 3.4G 113M 97% /usr
/dev/mapper/vglinux1-lvvar
485M 330M 145M 70% /var
# mount
/dev/mapper/vglinux1-lvroot on / type ext3 (rw)
/dev/mapper/vglinux1-lvusr on /usr type reiserfs (ro)
/dev/mapper/vglinux1-lvvar on /var type ext3 (rw)
>> If it's specific to `rpm -V' then perhaps direct-io is somehow causing
>> pagecache leakage. That would be a bit odd.
>>
>> btw, it's not necessary to go all the way to oom to work out if the
>> pagecache leak is happening. After booting, do
>>
>> echo 3 > /proc/sys/vm/drop_pagecache
>>
>> and record the `Cached' figure in /proc/meminfo. After running some test,
>> run `echo 3 > /proc/sys/vm/drop_pagecache' again and check
>> /proc/meminfo:Cached. If it dodn't do gown to a similarly low figure,
>> we're leaking pagecache.
>
> I played with these values and as far I can remember, I get some poor
> improvement. Will try to gather some data.
Please see attached file "typescript" for results of
`echo 3 > /proc/sys/vm/drop_pagecache'.
>> btw2: please use /proc/meminfo output rather than free(1). Because free(1)
>> shows less info, and it does mysterious mangling of the info which it does
>> read in ways which confuse me.
>
> Ok
>
--
laurent
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1 3 142944 11244 1540 385200 830 0 5063 12 510 451 1 6 0 92
0 4 142944 7376 2024 387448 383 0 3758 21 476 477 3 6 0 92
5 3 142944 9592 1476 385932 418 0 4704 281 506 444 3 8 0 88
0 4 142944 4984 1240 390836 120 0 7614 18 460 450 6 10 0 84
0 3 144816 7232 1460 390536 75 435 6089 710 518 476 3 11 0 86
1 3 144816 11148 1364 386208 220 0 4383 12 493 475 4 7 0 89
1 3 144816 6980 1356 389628 120 0 7460 9 465 443 3 6 0 91
0 3 135236 5460 1492 393056 997 0 4203 1 479 474 1 4 0 95
2 1 135236 12820 1196 380608 494 0 5389 81 484 437 12 5 0 83
0 2 135236 7660 1236 379816 288 9 2314 133 427 632 21 4 0 74
1 2 135792 10668 1116 375108 64 285 2584 314 450 514 12 8 0 80
1 3 137580 6368 1252 381388 77 550 1674 562 420 471 8 3 0 88
3 3 137688 5528 1280 382900 186 35 2373 43 490 519 4 3 0 93
1 3 137688 6716 1272 381120 123 0 1849 11 459 552 4 2 0 94
1 4 137688 5212 1228 381016 258 0 2119 9 481 545 3 2 0 95
0 3 137688 5652 1232 380476 209 0 2296 12 468 536 3 3 0 94
0 3 137688 7840 1184 376508 440 0 2768 7 482 537 3 4 0 93
1 3 137640 5508 1308 379116 23 0 1742 17 471 532 2 3 0 95
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
1 3 141812 8940 1192 375624 46 878 1044 881 443 547 3 3 0 94
2 2 141812 5740 1240 380424 64 0 1032 9 441 543 6 1 0 93
3 3 141812 6488 1204 379116 132 0 1419 12 433 502 12 6 0 82
1 3 141812 6984 1256 378996 61 0 2067 14 451 551 2 3 0 95
0 4 141812 5436 1236 380220 59 0 1207 11 458 570 4 3 0 94
1 2 141656 7140 1256 377964 122 0 1647 12 459 544 1 3 0 96
3 1 141656 6520 1220 378380 38 0 1678 19 451 559 3 3 0 94
0 3 141656 9060 1176 375664 74 0 1402 17 433 547 1 3 0 96
0 2 141656 6548 1188 377876 65 0 1254 13 447 568 3 2 0 95
0 3 141656 5284 1164 378924 25 0 1149 9 440 567 4 2 0 94
0 2 141656 7308 1164 376756 23 0 1134 11 444 563 3 3 0 94
2 2 145844 6332 1196 379020 29 1175 823 1184 436 491 2 3 0 96
0 4 145860 5192 1260 382988 194 9 1189 19 443 528 7 3 0 90
1 2 145860 6344 1224 379832 526 0 2200 11 427 527 2 3 0 95
0 2 145860 6688 1212 380036 80 0 1108 13 453 582 4 3 0 93
1 3 145860 5888 1176 380024 112 0 905 11 430 554 6 2 0 92
1 3 145860 6076 1200 379068 150 0 1168 12 447 552 3 3 0 93
1 4 145820 5444 1572 378508 67 0 1361 9 470 554 3 3 0 94
0 2 145820 5880 1500 378328 4 0 1509 26 442 568 2 4 0 94
2 3 145820 5088 1324 379244 2 0 1048 10 439 575 3 2 0 95
0 2 149264 9216 1264 375084 23 910 781 927 436 470 2 4 0 95
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
2 2 149264 5976 1376 380968 77 0 1258 7 462 569 3 1 0 96
1 2 149264 5156 1264 381316 191 0 1141 10 458 583 6 3 0 92
3 1 151708 6296 1336 382808 217 735 830 746 435 461 4 3 0 93
0 2 151708 7428 1256 381612 270 0 1657 16 442 513 6 3 0 91
9 4 151708 11412 1148 373848 1302 0 4791 12 487 457 3 8 0 90
1 4 151708 9100 1280 374496 708 0 4761 43 487 395 0 16 0 84
2 7 155120 6404 1328 379824 701 850 4039 868 462 394 0 6 0 94
1 9 157332 6028 1416 381316 379 773 2296 780 464 411 1 2 0 97
1 7 162144 5800 1488 386068 682 1418 2066 1432 429 374 0 2 0 98
1 3 162084 15036 1464 382352 501 0 4914 10 485 384 1 4 0 96
1 2 162832 15412 1400 375144 1890 298 2765 353 492 446 1 2 0 97
0 3 162832 4868 1180 381508 905 0 5570 17 486 446 6 5 0 88
7 5 162832 9408 1172 375292 791 0 4077 110 500 500 3 6 0 92
3 1 164976 5388 1208 378964 150 693 3724 714 442 389 4 6 0 90
0 3 165976 5504 1260 379144 543 406 3707 456 468 408 1 6 0 93
2 1 168148 7420 1240 377348 378 899 3979 932 462 415 1 7 0 92
0 6 168148 5400 1244 381824 535 34 3930 41 451 353 0 4 0 96
3 4 168148 6052 1264 381436 368 0 4577 8 494 364 1 4 0 96
0 3 168044 6328 1308 379864 682 0 5438 9 491 417 1 4 0 94
0 8 173256 6304 1248 380252 398 1447 3585 1459 499 414 1 6 0 94
0 5 173204 11776 1348 379592 426 0 2335 6 466 384 1 2 0 97
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
1 7 173740 17092 1176 374852 813 481 5263 522 497 449 2 7 0 91
0 4 177652 7972 1316 384596 274 934 2411 945 453 380 1 2 0 98
0 7 180284 5408 1428 391244 1139 756 2901 769 506 483 1 3 0 96
1 2 180284 7356 1360 386968 970 1 5561 22 491 524 5 3 0 92
2 1 180284 14348 1304 377388 1193 0 3551 30 489 655 15 5 0 80
2 2 180452 7892 1232 377548 2763 106 4475 136 558 533 1 4 0 96
1 2 181920 5460 1224 377828 1624 677 2578 689 533 461 0 4 0 96
0 4 182368 4956 1212 376308 1209 222 4513 236 509 447 1 7 0 92
0 8 182856 8292 1228 375160 590 296 4027 313 620 541 0 10 0 89
0 11 183652 6068 1308 374348 758 258 5703 281 544 460 0 8 0 91
0 18 183936 5548 1324 380768 348 1819 2068 1823 520 385 0 3 0 97
0 14 184264 5216 1436 385292 239 804 1343 808 441 385 0 1 0 99
0 13 185220 5124 1508 389880 306 1182 1412 1185 435 379 0 1 0 99
1 8 185720 5452 1628 393440 276 847 1207 848 432 380 0 1 0 99
0 2 186348 5680 1684 396396 437 877 1138 881 432 403 0 1 0 99
0 1 186360 6212 1604 388984 1954 43 3533 51 502 405 0 2 0 97
0 2 186360 5096 1148 373472 5382 0 6009 17 703 839 2 5 0 94
0 2 186528 9312 1180 376012 189 498 4450 509 492 319 1 8 0 92
0 2 186552 6068 1264 378496 341 53 6235 61 494 370 0 5 0 95
0 3 186552 8168 1168 371564 1699 126 5373 137 591 473 2 6 0 92
0 7 186556 6912 1176 373708 736 302 6215 313 506 423 0 8 0 92
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
1 16 186664 5952 1172 373924 1318 1937 8545 1964 875 750 0 10 0 90
1 21 187840 8392 1344 382380 274 1131 1674 1132 801 357 0 5 0 95
1 17 187844 7164 1428 385808 879 1120 2509 1122 452 356 0 1 0 99
0 12 187844 13980 1396 381308 565 460 2919 460 444 305 0 4 0 96
2 2 187844 12908 1368 374748 2693 0 5121 7 508 507 0 3 0 97
0 3 187864 6620 1336 380064 1452 386 4387 395 450 396 1 4 0 96
0 2 187864 9496 1284 376252 1416 0 4403 7 464 420 0 3 0 97
2 3 187864 5840 1236 376328 1860 0 4385 26 476 509 1 4 0 95
1 3 187864 5508 1208 376492 1230 27 4835 43 469 425 0 5 0 95
0 3 187884 8156 1188 371684 1499 317 4517 325 535 457 0 6 0 94
0 9 187920 6172 1232 373216 1359 1162 4482 1167 655 563 0 6 0 93
0 8 187920 7816 1204 374276 1038 1803 6959 1807 550 441 0 6 0 93
0 8 187920 5880 1336 386836 894 1761 3179 1761 763 559 0 3 0 97
1 6 187920 6212 1428 390828 1630 1087 2732 1089 464 398 0 3 0 97
1 5 187768 6468 1480 382820 2047 0 5389 4 477 462 0 4 0 96
0 4 187768 7424 1328 378128 2008 0 4948 12 467 468 0 4 0 96
1 4 187768 11104 1232 375308 1587 0 4737 6 476 443 0 4 0 96
0 2 187716 6444 1272 378840 1687 0 4201 26 471 446 0 4 0 96
0 27 187716 6404 1180 377732 1980 0 5786 22 536 500 0 7 0 92
0 30 187752 15116 1412 379172 633 1651 3689 1668 523 438 0 7 0 93
0 26 187756 19548 1464 376068 820 91 3885 91 622 589 0 3 0 97
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
1 16 187756 5320 1684 384800 1182 0 2946 6 453 473 0 1 0 98
1 15 187756 6428 1716 380392 1182 0 3135 38 450 484 2 4 0 94
0 11 187756 5020 1508 383044 853 0 4106 28 451 440 0 3 0 96
0 17 171176 5400 1520 385240 903 0 4191 19 447 390 0 4 0 96
2 16 171056 9388 1456 380620 490 158 3684 173 451 357 0 5 0 95
0 10 171056 6464 1512 384828 526 0 3919 20 439 308 0 3 0 97
1 18 171312 5936 1356 381996 541 294 4295 339 461 345 1 5 0 95
0 13 170796 6364 1496 387708 450 678 2102 680 441 297 0 2 0 98
0 31 170796 8020 1488 383504 1046 62 2833 64 445 397 0 2 0 97
0 10 170280 8580 1508 385948 628 0 3747 6 428 312 0 3 0 96
1 18 169864 10348 1540 379860 1230 0 3646 31 437 391 1 4 0 95
0 27 169900 11592 1428 378688 840 146 3733 173 449 347 0 4 0 96
0 26 169772 6732 1476 382676 706 0 3210 6 463 354 0 2 0 97
0 24 170372 7036 1400 383996 698 919 2596 931 441 353 0 5 0 95
0 20 99548 6412 1728 393476 830 78 2803 84 452 387 1 2 0 97
0 13 82212 6616 1908 397108 958 313 1906 322 447 349 0 2 0 97
0 8 72732 8072 2152 398500 826 12 2248 24 428 364 1 2 0 97
0 6 66136 16176 2260 391552 567 0 3060 44 412 367 1 4 0 95
0 7 66084 11384 2348 394576 588 0 4641 22 446 347 1 5 0 94
1 8 66084 5496 1800 398888 422 0 6239 428 448 320 1 5 0 94
1 6 66088 5472 1676 398864 412 0 4112 184 439 293 0 3 0 97
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
2 5 60468 10752 1608 397652 787 1 4840 605 425 287 37 49 0 14
1 1 32236 11324 1848 402152 284 0 1891 16 388 262 45 55 0 0
2 1 32216 9504 2016 402372 2 0 48 25 281 145 47 53 0 0
4 1 32216 6548 1956 400708 6 0 2164 14 328 197 45 55 0 0
5 2 32216 5288 1892 400600 0 0 1474 8 311 201 45 55 0 0
1 5 30188 6944 2328 402808 466 0 1175 22 385 394 42 58 0 0
1 1 28248 10000 2524 397492 71 0 273 28 292 286 47 53 0 0
1 1 28248 10016 2532 397492 0 0 0 5 254 141 42 58 0 0
1 1 28136 10916 2612 397712 49 0 99 61 288 180 41 59 0 0
1 1 28136 10964 2628 397712 0 0 0 6 254 97 40 60 0 0
2 1 28136 11144 2632 397712 0 0 0 1 252 92 41 59 0 0
2 1 28136 11168 2636 397712 0 0 0 1 253 95 39 61 0 0
2 1 28136 11184 2640 397712 0 0 0 2 252 93 40 60 0 0
1 1 28136 11200 2644 397712 0 0 0 1 252 95 40 60 0 0
1 1 28136 11208 2648 397712 0 0 0 1 254 99 44 56 0 0
3 1 28136 11208 2652 397712 0 0 0 1 251 92 43 57 0 0
1 1 28136 11208 2656 397712 0 0 0 6 256 92 41 59 0 0
1 1 28136 11208 2660 397712 0 0 0 1 251 93 37 63 0 0
1 1 28136 11208 2664 397712 0 0 0 1 252 95 38 62 0 0
1 1 28136 11208 2668 397712 0 0 0 1 251 93 39 61 0 0
1 1 28128 10892 2684 397972 74 0 126 1 265 121 42 58 0 0
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
2 1 28128 10892 2692 397972 0 0 0 4 253 96 39 61 0 0
1 1 28128 10908 2696 397972 0 0 0 1 253 93 43 57 0 0
1 1 28084 10720 2704 398188 6 0 50 2 263 123 41 59 0 0
1 1 28076 10720 2716 398188 3 0 3 3 257 111 41 59 0 0
1 1 28076 10720 2724 398188 4 0 4 3 256 106 44 56 0 0
1 1 28064 33288 1300 376968 1 0 190 1 283 119 33 67 0 0
2 1 27500 33304 1356 377192 119 0 166 5 270 130 41 59 0 0
[root@antares test4]# date
ven aoû 11 10:50:10 CEST 2006
[root@antares test4]# cat /proc/memeinfo
MemTotal: 515032 kB
MemFree: 7756 kB
Buffers: 1348 kB
Cached: 376276 kB
SwapCached: 14852 kB
Active: 38408 kB
Inactive: 374000 kB
SwapTotal: 1116428 kB
SwapFree: 967164 kB
Dirty: 64 kB
Writeback: 0 kB
AnonPages: 30164 kB
Mapped: 7028 kB
Slab: 84120 kB
PageTables: 1956 kB
NFS Unstable: 0 kB
Bounce: 0 kB
CommitLimit: 1373944 kB
Committed_AS: 493124 kB
VmallocTotal: 515796 kB
VmallocUsed: 6860 kB
VmallocChunk: 508788 kB
[root@antares test4]# echo 3 > /proc/sys/vm/drop_caches
[root@antares test4]# cat /proc/meminfo
MemTotal: 515032 kB
MemFree: 6000 kB
Buffers: 1336 kB
Cached: 380164 kB
SwapCached: 12680 kB
Active: 40532 kB
Inactive: 373024 kB
SwapTotal: 1116428 kB
SwapFree: 964720 kB
Dirty: 12 kB
Writeback: 0 kB
AnonPages: 31600 kB
Mapped: 7676 kB
Slab: 84016 kB
PageTables: 1960 kB
NFS Unstable: 0 kB
Bounce: 0 kB
CommitLimit: 1373944 kB
Committed_AS: 493132 kB
VmallocTotal: 515796 kB
VmallocUsed: 6860 kB
VmallocChunk: 508788 kB
[root@antares test4]# date
ven aoû 11 10:50:56 CEST 2006
[root@antares test4]# vmstat 3
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
0 7 162140 5848 1572 390100 85 127 2205 213 418 514 9 8 22 61
0 4 162084 16916 1428 380376 481 0 5819 8 490 388 1 5 0 95
0 2 162084 5292 1588 386112 2135 0 4054 53 524 494 1 2 0 98
0 1 162832 11388 1372 375764 1424 497 1963 540 462 395 1 3 0 96
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