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SubjectRe: audio cd writing causes massive swap and crash
The patch does not work.  I've just had the chance to try it out and the 
same exact problem occurs with no difference. I ran vmstat while this
was going on, but not being the very first run, it'll probably be hard
to tell what's going on . The moment free mem drop is when i started
the cdrecord process. the cdrecord command line looks something like this:

/usr/local/bin/cdrecord
-v
-eject
-pad
speed=48
dev=/dev/hdc
-dao
fs=12m
driveropts=burnproof
-audio
-swab





Jens Axboe wrote:

>On Sat, Jul 17 2004, Ed Sweetman wrote:
>
>
>>Both with 2.6.7-rc3 and 2.6.8-rc1-mm1 I get the same behavior when
>>writing an audio cd on my plextor px-712a. DMA is enabled and normal
>>data cds write as expected, but audio cds will cause (at any speed) the
>>box to start using insane amounts of swap (>150MB) and eventually cause
>>the box to crash before finishing the cd. CPU usage during the write is
>>very low, but the feeling of lagginess begins after the first few tracks
>>(and as the memory begins to be sucked away). I've used both cdrecord
>>from cdrtools in debian and from the site and both have the same
>>behavior. I dont know how i'd go about finding out what the problem is,
>>so far I've coastered over 10 cds trying different ways of burning an
>>audio cd but it appears that burnfree, speed have nothing to do with the
>>problem.
>>
>>Here's some drive info if it helps.
>>
>>Linux sg driver version: 3.5.27
>>Using libscg version 'schily-0.8'.
>>Device type : Removable CD-ROM
>>Version : 0
>>Response Format: 1
>>Vendor_info : 'PLEXTOR '
>>Identifikation : 'DVDR PX-712A '
>>Revision : '1.01'
>>Device seems to be: Generic mmc2 DVD-R/DVD-RW.
>>cdrecord: This version of cdrecord does not include DVD-R/DVD-RW support
>>code.
>>cdrecord: See /usr/share/doc/cdrecord/README.DVD.Debian for details on
>>DVD support.
>>Using generic SCSI-3/mmc CD-R/CD-RW driver (mmc_cdr).
>>Driver flags : MMC-3 SWABAUDIO BURNFREE VARIREC FORCESPEED SPEEDREAD
>>SINGLESESSION HIDECDR
>>Supported modes: TAO PACKET SAO SAO/R96P SAO/R96R RAW/R16 RAW/R96P RAW/R96R
>>
>>
>>now in cdrecord i use the option -swab not sure if that counters the
>>driver flags or what, either way I doubt it would be causing this problem.
>>
>>the drive by the way is mmc4 compliant, so it's weird that it says mmc2.
>>any more info that's needed just tell me.
>>
>>
>
>Sounds like it's leaking all the pages, vmstat 1 during rip will show
>for sure. Can you check if this makes a difference, against
>2.6.8-rc-mm1 (should apply with offsets, I'm on the road so cannot test
>myself)?
>
>--- /mnt/kscratch/linux-2.6.5/mm/highmem.c 2004-04-04 05:37:25.000000000 +0200
>+++ linux-2.6.5-SUSE-20040713/mm/highmem.c 2004-07-15 10:28:12.142262512 +0200
>@@ -309,12 +309,10 @@ static void bounce_end_io(struct bio *bi
> {
> struct bio *bio_orig = bio->bi_private;
> struct bio_vec *bvec, *org_vec;
>- int i;
>+ int i, err = 0;
>
> if (!test_bit(BIO_UPTODATE, &bio->bi_flags))
>- goto out_eio;
>-
>- set_bit(BIO_UPTODATE, &bio_orig->bi_flags);
>+ err = -EIO;
>
> /*
> * free up bounce indirect pages used
>@@ -327,8 +325,7 @@ static void bounce_end_io(struct bio *bi
> mempool_free(bvec->bv_page, pool);
> }
>
>-out_eio:
>- bio_endio(bio_orig, bio_orig->bi_size, 0);
>+ bio_endio(bio_orig, bio_orig->bi_size, err);
> bio_put(bio);
> }
>
>--- /mnt/kscratch/linux-2.6.5/fs/bio.c 2004-07-14 23:12:42.000000000 +0200
>+++ linux-2.6.5-SUSE-20040713/fs/bio.c 2004-07-15 10:30:53.263775247 +0200
>@@ -549,7 +549,6 @@ static struct bio *__bio_map_user(reques
> bio->bi_rw |= (1 << BIO_RW);
>
> bio->bi_flags |= (1 << BIO_USER_MAPPED);
>- blk_queue_bounce(q, &bio);
> return bio;
> out:
> kfree(pages);
>--- /mnt/kscratch/linux-2.6.5/drivers/block/scsi_ioctl.c 2004-07-14 23:12:42.000000000 +0200
>+++ linux-2.6.5-SUSE-20040713/drivers/block/scsi_ioctl.c 2004-07-15 10:26:39.089364958 +0200
>@@ -167,6 +167,13 @@ static int sg_io(request_queue_t *q, str
> rq->flags |= REQ_BLOCK_PC;
> bio = rq->bio;
>
>+ /*
>+ * bounce this after holding a reference to the original bio, it's
>+ * needed for proper unmapping
>+ */
>+ if (rq->bio)
>+ blk_queue_bounce(q, &rq->bio);
>+
> rq->timeout = (hdr->timeout * HZ) / 1000;
> if (!rq->timeout)
> rq->timeout = q->sg_timeout;
>--- /mnt/kscratch/linux-2.6.5/drivers/cdrom/cdrom.c 2004-07-14 23:12:42.000000000 +0200
>+++ linux-2.6.5-SUSE-20040713/drivers/cdrom/cdrom.c 2004-07-15 10:27:17.219225057 +0200
>@@ -1975,6 +1975,9 @@ static int cdrom_read_cdda_bpc(struct cd
> rq->timeout = 60 * HZ;
> bio = rq->bio;
>
>+ if (rq->bio)
>+ blk_queue_bounce(q, &rq->bio);
>+
> if (blk_execute_rq(q, cdi->disk, rq)) {
> struct request_sense *s = rq->sense;
> ret = -EIO;
>--- /mnt/kscratch/linux-2.6.5/drivers/block/ll_rw_blk.c 2004-07-14 23:12:42.000000000 +0200
>+++ linux-2.6.5-SUSE-20040713/drivers/block/ll_rw_blk.c 2004-07-15 10:34:51.152967583 +0200
>@@ -1807,6 +1807,12 @@ EXPORT_SYMBOL(blk_insert_request);
> *
> * A matching blk_rq_unmap_user() must be issued at the end of io, while
> * still in process context.
>+ *
>+ * Note: The mapped bio may need to be bounced through blk_queue_bounce()
>+ * before being submitted to the device, as pages mapped may be out of
>+ * reach. It's the callers responsibility to make sure this happens. The
>+ * original bio must be passed back in to blk_rq_unmap_user() for proper
>+ * unmapping.
> */
> struct request *blk_rq_map_user(request_queue_t *q, int rw, void __user *ubuf,
> unsigned int len)
>
>
>
>

procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
0 0 9424 17540 14060 378248 0 0 297 202 20 235 4 2 91 4
6 0 9424 17540 14068 378248 0 0 0 30 1336 405 1 1 98 0
0 0 9424 17940 14068 378248 0 0 0 0 1494 1590 9 1 90 0
0 0 9424 17940 14068 378248 0 0 0 0 1415 334 0 0 100 0
0 0 9424 17940 14068 378248 0 0 0 0 1441 377 1 0 99 0
0 0 9424 17928 14076 378248 0 0 0 8 1450 700 7 2 91 0
0 0 9424 17928 14084 378248 0 0 0 8 1388 349 1 1 98 0
0 0 9424 17964 14084 378248 0 0 0 0 1284 245 1 0 99 0
0 0 9424 17964 14084 378248 0 0 0 0 1229 213 1 0 99 0
0 0 9424 17964 14084 378248 0 0 0 0 1241 224 0 0 100 0
0 0 9424 17968 14084 378248 0 0 0 14 1322 240 1 1 98 0
0 0 9424 18016 14088 378248 0 0 0 8 1268 223 1 1 98 0
2 0 9424 5384 14088 390540 0 0 0 0 1375 767 10 5 85 0
0 0 9424 4812 14084 390288 0 0 4608 0 1388 2761 10 4 69 17
0 0 9424 4828 14084 390288 0 0 0 0 1377 593 2 4 94 0
0 0 9424 3156 14060 391876 0 0 4092 18 1433 710 4 9 77 10
0 0 9424 3584 14068 391876 0 0 0 26 1503 1284 14 4 82 0
0 0 9424 3580 14068 391876 0 0 0 0 1375 594 10 0 90 0
0 0 9424 3572 14076 391876 0 0 0 20 1465 703 10 1 89 0
0 0 9424 3576 14076 391876 0 0 0 0 1285 549 7 2 91 0
0 0 9424 3568 14076 391876 0 0 0 0 1365 411 5 0 95 0
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
0 0 9424 3576 14084 391876 0 0 0 8 1463 507 11 0 89 0
0 0 9424 3576 14084 391876 0 0 0 0 1218 330 1 0 99 0
0 0 9424 3576 14084 391876 0 0 0 0 1229 316 2 0 98 0
0 0 9424 3572 14084 391876 0 0 0 0 1232 319 1 0 99 0
0 0 9424 3596 14084 391876 0 0 0 0 1228 341 3 1 96 0
0 0 9424 3532 14088 391876 0 0 0 16 1300 420 2 1 97 0
0 0 9424 2848 14088 391876 0 0 0 0 1293 338 1 0 99 0
0 0 9424 4780 14088 389316 0 0 0 0 1245 353 0 0 98 2
0 0 9424 4144 14088 389316 0 0 0 0 1263 348 1 1 98 0
0 0 9424 3496 14092 389316 0 0 0 6 1262 359 1 1 98 0
0 0 9424 2860 14096 389316 0 0 0 8 1427 482 2 0 98 0
0 0 9424 4808 14084 386808 0 0 0 0 1497 513 5 0 93 2
0 0 9424 4172 14084 386808 0 0 0 0 1399 430 4 0 96 0
0 0 9424 3500 14084 386808 0 0 0 0 1267 1041 3 2 95 0
0 0 9424 2856 14084 386808 0 0 0 4 1438 1132 6 3 91 0
0 0 9460 4580 14092 384424 0 40 0 48 1350 428 1 0 99 0
0 0 9460 4012 14092 384424 0 0 0 0 1247 350 1 0 99 0
0 0 9460 3432 14092 384424 0 0 0 0 1264 355 0 0 100 0
0 0 9460 2768 14092 384424 0 0 0 0 1257 342 1 1 98 0
3 1 9460 4076 14072 380900 0 0 0 6 1431 152 1 96 4 0
6 3 9464 4116 14000 378028 0 64 4102 88 1876 187 1 97 0 2
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
0 0 9464 2724 13736 376512 0 0 4240 2 2369 641 3 97 1 0
0 6 9464 3956 13676 372872 0 0 140 0 1618 342 2 94 3 2
6 3 9464 3996 12828 369832 0 0 4360 20 2742 457 0 86 6 7
1 7 9464 4060 12392 367736 0 0 3740 8 1754 175 1 98 0 1
1 0 9464 3360 12320 366144 0 0 0 0 1513 293 3 96 2 0
1 0 9464 4044 11724 363572 0 0 0 12 1481 595 4 95 2 0
0 6 9464 4036 11720 361888 0 0 0 0 1433 162 1 75 24 0
3 6 9464 4036 8416 361224 0 0 2048 0 2780 151 1 97 0 3
0 2 9464 3972 7920 359576 64 0 4168 14 1350 230 2 96 0 2
3 2 9464 4188 7816 357884 32 0 6192 0 1842 297 1 98 1 0
5 3 9464 4060 7776 354732 0 8 4100 20 2500 330 3 84 12 2
1 1 9464 3588 7708 352336 28 0 4534 0 1983 196 1 96 0 3
0 0 9464 3208 7700 350540 0 0 0 8 1345 315 3 94 3 0
1 1 9464 4040 7648 347776 0 0 4100 6 1447 219 1 94 3 2
3 5 9464 4036 7648 345984 0 0 0 0 1396 194 1 79 19 2
3 5 9464 3980 7512 342692 0 0 4124 0 2141 205 1 97 0 2
2 0 9464 4176 7456 340328 8 0 4108 12 1474 284 2 95 2 2
2 0 9464 4048 7460 338280 0 0 0 8 1577 317 3 95 3 0
0 4 9464 4044 7436 336400 0 0 1936 0 1429 170 1 79 19 1
6 1 9464 4044 7396 332604 0 0 0 12 2125 180 0 99 0 1
3 0 9464 3996 7388 330440 0 0 12 0 1368 309 3 95 2 0
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
0 2 9464 3956 7188 328216 0 0 2048 0 1564 500 5 93 1 2
1 2 9464 4084 6916 326356 0 0 2056 8 1517 1363 4 83 11 3
0 4 9464 4084 6580 322508 0 0 2048 8 1531 465 2 95 0 3
2 0 9464 3252 6572 323040 0 0 6160 4 1636 279 3 97 0 0
2 0 9464 3420 6552 321144 0 0 4100 14 1494 485 3 97 0 0
11 3 9464 4116 6552 316784 36 0 36 6 2268 451 2 86 10 2
2 0 9468 4140 6556 312612 28 16 8240 36 4190 535 2 98 0 0
0 0 9468 4108 6556 312600 0 0 0 6 1328 3161 11 15 74 0
1 0 9468 4108 6556 312600 0 0 0 0 1534 1201 5 15 80 0
0 0 9468 4556 6556 312600 32 0 32 0 1380 1397 8 7 85 0
0 0 9468 4556 6556 312600 0 0 0 0 1239 213 0 0 100 0
0 0 9468 4556 6572 312600 0 0 0 24 1227 247 1 0 99 0
0 0 9468 4580 6572 312600 0 0 0 4 1225 241 3 3 94 0
0 0 9468 4580 6572 312600 0 0 0 0 1234 221 1 0 99 0
1 0 9468 17332 6572 300308 36 0 36 0 1276 573 6 1 93 0
0 0 9428 17844 6572 300308 0 0 0 0 1247 867 4 1 95 0
0 0 9428 17844 6576 300308 0 0 0 8 1259 347 2 0 98 0
0 0 9428 17844 6584 300308 4 0 4 6 1260 339 2 2 96 0
0 0 9428 17860 6584 300308 0 0 0 0 1261 368 2 0 98 0
0 0 9428 17860 6584 300308 0 0 0 0 1243 219 1 0 99 0
0 0 9428 17860 6584 300308 0 0 0 0 1234 216 1 1 98 0
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
0 0 9428 17860 6592 300308 0 0 0 8 1244 223 0 0 99 1
0 0 9428 17900 6592 300308 0 0 0 0 1234 223 1 0 99 0
0 0 9428 17900 6592 300308 0 0 0 0 1227 224 0 0 100 0
0 0 9428 17900 6592 300308 0 0 0 0 1240 241 2 0 98 0
0 0 9428 17900 6592 300308 0 0 0 0 1239 221 0 0 100 0
0 0 9428 17932 6596 300308 0 0 0 8 1229 228 1 1 98 0
0 0 9428 17932 6596 300308 0 0 0 0 1225 220 1 1 98 0
0 0 9428 17932 6596 300308 0 0 0 0 1223 214 0 0 100 0
0 0 9428 17932 6596 300308 0 0 0 0 1222 225 1 0 99 0
0 0 9428 17924 6596 300308 0 0 0 0 1438 954 7 1 92 0
0 0 9428 17924 6604 300312 0 0 0 14 1282 366 3 1 96 0
0 0 9428 17924 6604 300312 0 0 0 0 1407 372 3 1 96 0
0 0 9428 17924 6608 300312 0 0 0 6 1526 468 2 0 98 0
0 0 9428 17932 6608 300312 0 0 0 0 1226 217 1 0 99 0
0 0 9428 17740 6612 300560 0 0 252 0 1262 350 2 0 94 4
0 0 9428 17740 6616 300560 0 0 0 8 1473 677 4 1 95 0
0 0 9428 17740 6616 300560 0 0 0 4 1241 263 1 0 99 0
0 0 9428 19404 6616 300560 0 0 0 0 1326 1142 12 2 86 0
0 0 9428 19404 6616 300560 0 0 0 0 1275 245 2 0 98 0
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