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View Code? Open in Web Editor NEWGeneric block-level cache utility based on Linux device mapper framework
Home Page: http://visa.cis.fiu.edu/dmcache/
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testing dm-cache
Hi, thanks for nice works.
I'm trying dm-cache 3.0.8. I like to configure it like
/dev/sda (ssd) : cache device
/dev/sdd (hdd): source device
Disk /dev/sda: 60.0 GB, 60022480896 bytes 255 heads, 63 sectors/track, 7297 cylinders, total 117231408 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/sda doesn't contain a valid partition table Disk /dev/sdd: 500.1 GB, 500107862016 bytes 81 heads, 63 sectors/track, 191411 cylinders, total 976773168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xd091d92e Device Boot Start End Blocks Id System /dev/sdd1 2048 976773167 488385560 83 Linux
And I tried the following command to initialize it:
(I think it would be better if I don't have to calculate the number of blocks in cache dev. I just like to whole ssd as a cache)
echo 0 976773168 cache /dev/sdd /dev/sda 0 8 7864320 1024 0 | dmsetup create cache1
where,
0 976773168 : whole sector range of /dev/sdd
0 8: block size = 512 * 8 = 4k
7864320: 30G cache space = 30_1024_1024*1024/4096 blocks (It's around half of its capacity)
and it fails.
My machine is
- i686 Intel(R) Pentium(R) D CPU 3.00GHz GenuineIntel GNU/Linux
- 1.5 GB RAM
- Gentoo Linux, kernel-3.2.2 (vanillia)
[ 1814.716320] ------------[ cut here ]------------ [ 1814.716337] WARNING: at fs/block_dev.c:937 bd_unlink_disk_holder+0x1d6/0x1f0() [ 1814.716344] Hardware name: OptiPlex GX620 [ 1814.716349] Modules linked in: dm_cache(O) [ 1814.716363] Pid: 3069, comm: dmsetup Tainted: G O 3.2.2 #1 [ 1814.716373] Call Trace: [ 1814.716387] [] warn_slowpath_common+0xdc/0x160 [ 1814.716397] [] ? bd_unlink_disk_holder+0x1d6/0x1f0 [ 1814.716406] [] ? bd_unlink_disk_holder+0x1d6/0x1f0 [ 1814.716416] [] warn_slowpath_null+0x3e/0x50 [ 1814.716425] [] bd_unlink_disk_holder+0x1d6/0x1f0 [ 1814.716437] [] close_dev+0x4d/0x90 [ 1814.716445] [] dm_put_device+0x57/0xa0 [ 1814.716457] [] cache_ctr+0x462/0x1840 [dm_cache] [ 1814.716469] [] ? _copy_from_user+0x45/0x90 [ 1814.716484] [] ? _raw_write_unlock+0x43/0xa0 [ 1814.716495] [] ? realloc_argv+0x3f/0xc0 [ 1814.716503] [] ? realloc_argv+0x79/0xc0 [ 1814.716513] [] ? realloc_argv+0x79/0xc0 [ 1814.716524] [] ? dm_split_args+0x67/0x250 [ 1814.716536] [] dm_table_add_target+0x176/0x630 [ 1814.716546] [] ? alloc_targets+0x8b/0x120 [ 1814.716559] [] table_load+0x18c/0x670 [ 1814.716571] [] dm_ctl_ioctl+0x1cd/0x480 [ 1814.716582] [] ? table_clear+0x100/0x100 [ 1814.716591] [] ? copy_params+0x220/0x220 [ 1814.716601] [] do_vfs_ioctl+0xa4/0xa80 [ 1814.716610] [] ? sub_preempt_count+0x7d/0xa0 [ 1814.716620] [] ? vfsmount_lock_local_unlock+0x58/0xb0 [ 1814.716629] [] ? mntput_no_expire+0x59/0x290 [ 1814.716640] [] ? sys_semctl+0xe3/0x140 [ 1814.716652] [] sys_ioctl+0x76/0xd0 [ 1814.716662] [] sysenter_do_call+0x12/0x2b [ 1814.716673] [] ? do_one_pass+0x4f9/0x8e0 [ 1814.716683] ---[ end trace 798168b08048292b ]--- [ 1814.716688] ------------[ cut here ]------------ [ 1814.716696] WARNING: at fs/block_dev.c:1478 blkdev_put+0x20c/0x260() [ 1814.716701] Hardware name: OptiPlex GX620 [ 1814.716705] Modules linked in: dm_cache(O) [ 1814.716715] Pid: 3069, comm: dmsetup Tainted: G W O 3.2.2 #1 [ 1814.716720] Call Trace: [ 1814.716729] [] warn_slowpath_common+0xdc/0x160 [ 1814.716738] [] ? blkdev_put+0x20c/0x260 [ 1814.716746] [] ? blkdev_put+0x20c/0x260 [ 1814.716755] [] warn_slowpath_null+0x3e/0x50 [ 1814.716763] [] blkdev_put+0x20c/0x260 [ 1814.716771] [] close_dev+0x69/0x90 [ 1814.716779] [] dm_put_device+0x57/0xa0 [ 1814.716789] [] cache_ctr+0x462/0x1840 [dm_cache] [ 1814.716799] [] ? _copy_from_user+0x45/0x90 [ 1814.716811] [] ? _raw_write_unlock+0x43/0xa0 [ 1814.716820] [] ? realloc_argv+0x3f/0xc0 [ 1814.716827] [] ? realloc_argv+0x79/0xc0 [ 1814.716835] [] ? realloc_argv+0x79/0xc0 [ 1814.716844] [] ? dm_split_args+0x67/0x250 [ 1814.716853] [] dm_table_add_target+0x176/0x630 [ 1814.716861] [] ? alloc_targets+0x8b/0x120 [ 1814.716871] [] table_load+0x18c/0x670 [ 1814.716880] [] dm_ctl_ioctl+0x1cd/0x480 [ 1814.716889] [] ? table_clear+0x100/0x100 [ 1814.716898] [] ? copy_params+0x220/0x220 [ 1814.716906] [] do_vfs_ioctl+0xa4/0xa80 [ 1814.716914] [] ? sub_preempt_count+0x7d/0xa0 [ 1814.716922] [] ? vfsmount_lock_local_unlock+0x58/0xb0 [ 1814.716930] [] ? mntput_no_expire+0x59/0x290 [ 1814.716939] [] ? sys_semctl+0xe3/0x140 [ 1814.716948] [] sys_ioctl+0x76/0xd0 [ 1814.716957] [] sysenter_do_call+0x12/0x2b [ 1814.716965] [] ? do_one_pass+0x4f9/0x8e0 [ 1814.716972] ---[ end trace 798168b08048292c ]--- [ 1814.716977] ------------[ cut here ]------------ [ 1814.716984] WARNING: at fs/block_dev.c:1479 blkdev_put+0x243/0x260() [ 1814.716989] Hardware name: OptiPlex GX620 [ 1814.716994] Modules linked in: dm_cache(O) [ 1814.717003] Pid: 3069, comm: dmsetup Tainted: G W O 3.2.2 #1 [ 1814.717040] Call Trace: [ 1814.717050] [] warn_slowpath_common+0xdc/0x160 [ 1814.717059] [] ? blkdev_put+0x243/0x260 [ 1814.717067] [] ? blkdev_put+0x243/0x260 [ 1814.717076] [] warn_slowpath_null+0x3e/0x50 [ 1814.717084] [] blkdev_put+0x243/0x260 [ 1814.717093] [] close_dev+0x69/0x90 [ 1814.717101] [] dm_put_device+0x57/0xa0 [ 1814.717111] [] cache_ctr+0x462/0x1840 [dm_cache] [ 1814.717121] [] ? _copy_from_user+0x45/0x90 [ 1814.717133] [] ? _raw_write_unlock+0x43/0xa0 [ 1814.717143] [] ? realloc_argv+0x3f/0xc0 [ 1814.717151] [] ? realloc_argv+0x79/0xc0 [ 1814.717159] [] ? realloc_argv+0x79/0xc0 [ 1814.717167] [] ? dm_split_args+0x67/0x250 [ 1814.717177] [] dm_table_add_target+0x176/0x630 [ 1814.717186] [] ? alloc_targets+0x8b/0x120 [ 1814.717195] [] table_load+0x18c/0x670 [ 1814.717205] [] dm_ctl_ioctl+0x1cd/0x480 [ 1814.717215] [] ? table_clear+0x100/0x100 [ 1814.717224] [] ? copy_params+0x220/0x220 [ 1814.717232] [] do_vfs_ioctl+0xa4/0xa80 [ 1814.717240] [] ? sub_preempt_count+0x7d/0xa0 [ 1814.717249] [] ? vfsmount_lock_local_unlock+0x58/0xb0 [ 1814.717257] [] ? mntput_no_expire+0x59/0x290 [ 1814.717266] [] ? sys_semctl+0xe3/0x140 [ 1814.717276] [] sys_ioctl+0x76/0xd0 [ 1814.717285] [] sysenter_do_call+0x12/0x2b [ 1814.717294] [] ? do_one_pass+0x4f9/0x8e0 [ 1814.717302] ---[ end trace 798168b08048292d ]--- [ 1814.724116] ------------[ cut here ]------------ [ 1814.724128] WARNING: at fs/block_dev.c:1431 __blkdev_put+0x2c1/0x2e0() [ 1814.724134] Hardware name: OptiPlex GX620 [ 1814.724139] Modules linked in: dm_cache(O) [ 1814.724152] Pid: 3069, comm: dmsetup Tainted: G W O 3.2.2 #1 [ 1814.724158] Call Trace: [ 1814.724169] [] warn_slowpath_common+0xdc/0x160 [ 1814.724181] [] ? __blkdev_put+0x2c1/0x2e0 [ 1814.724189] [] ? __blkdev_put+0x2c1/0x2e0 [ 1814.724199] [] warn_slowpath_null+0x3e/0x50 [ 1814.724208] [] __blkdev_put+0x2c1/0x2e0 [ 1814.724220] [] ? disk_flush_events+0x67/0x100 [ 1814.724229] [] blkdev_put+0x7f/0x260 [ 1814.724239] [] close_dev+0x69/0x90 [ 1814.724247] [] dm_put_device+0x57/0xa0 [ 1814.724258] [] cache_ctr+0x462/0x1840 [dm_cache] [ 1814.724270] [] ? _copy_from_user+0x45/0x90 [ 1814.724284] [] ? _raw_write_unlock+0x43/0xa0 [ 1814.724294] [] ? realloc_argv+0x3f/0xc0 [ 1814.724302] [] ? realloc_argv+0x79/0xc0 [ 1814.724311] [] ? realloc_argv+0x79/0xc0 [ 1814.724321] [] ? dm_split_args+0x67/0x250 [ 1814.724333] [] dm_table_add_target+0x176/0x630 [ 1814.724342] [] ? alloc_targets+0x8b/0x120 [ 1814.724354] [] table_load+0x18c/0x670 [ 1814.724366] [] dm_ctl_ioctl+0x1cd/0x480 [ 1814.724377] [] ? table_clear+0x100/0x100 [ 1814.724387] [] ? copy_params+0x220/0x220 [ 1814.724396] [] do_vfs_ioctl+0xa4/0xa80 [ 1814.724405] [] ? sub_preempt_count+0x7d/0xa0 [ 1814.724415] [] ? vfsmount_lock_local_unlock+0x58/0xb0 [ 1814.724424] [] ? mntput_no_expire+0x59/0x290 [ 1814.724435] [] ? sys_semctl+0xe3/0x140 [ 1814.724447] [] sys_ioctl+0x76/0xd0 [ 1814.724457] [] sysenter_do_call+0x12/0x2b [ 1814.724467] [] ? do_one_pass+0x4f9/0x8e0 [ 1814.724477] ---[ end trace 798168b08048292e ]--- [ 1814.724496] BUG: unable to handle kernel NULL pointer dereference at 00000004 [ 1814.724583] IP: [] dm_put_device+0x6b/0xa0 [ 1814.724637] *pde = 00000000 [ 1814.724670] Oops: 0002 [#1] PREEMPT SMP [ 1814.724719] Modules linked in: dm_cache(O) [ 1814.724766] [ 1814.724785] Pid: 3069, comm: dmsetup Tainted: G W O 3.2.2 #1 Dell Inc. OptiPlex GX620 /0ND237 [ 1814.724902] EIP: 0060:[] EFLAGS: 00010246 CPU: 0 [ 1814.724955] EIP is at dm_put_device+0x6b/0xa0 [ 1814.724997] EAX: 00200200 EBX: f5ab054c ECX: 00000000 EDX: 00000000 [ 1814.725015] ESI: f5ab0540 EDI: ffffffea EBP: f5b8fd48 ESP: f5b8fd40 [ 1814.725015] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 [ 1814.725015] Process dmsetup (pid: 3069, ti=f5b8e000 task=f56443f0 task.ti=f5b8e000) [ 1814.725015] Stack: [ 1814.725015] f84fe080 f5bae500 f5b8fe44 f880ecb2 f84f9176 f88117ba f5b8fe24 00000000 [ 1814.725015] f5b8fd74 c153a785 00000000 f5a13ec0 f5a13f20 f5b8fdb0 f5ab0480 00000000 [ 1814.725015] 00000246 00000000 f7ffe000 80100010 00000003 00000001 000000eb 00000000 [ 1814.725015] Call Trace: [ 1814.725015] [] cache_ctr+0x462/0x1840 [dm_cache] [ 1814.725015] [] ? _copy_from_user+0x45/0x90 [ 1814.725015] [] ? _raw_write_unlock+0x43/0xa0 [ 1814.725015] [] ? realloc_argv+0x3f/0xc0 [ 1814.725015] [] ? realloc_argv+0x79/0xc0 [ 1814.725015] [] ? realloc_argv+0x79/0xc0 [ 1814.725015] [] ? dm_split_args+0x67/0x250 [ 1814.725015] [] dm_table_add_target+0x176/0x630 [ 1814.725015] [] ? alloc_targets+0x8b/0x120 [ 1814.725015] [] table_load+0x18c/0x670 [ 1814.725015] [] dm_ctl_ioctl+0x1cd/0x480 [ 1814.725015] [] ? table_clear+0x100/0x100 [ 1814.725015] [] ? copy_params+0x220/0x220 [ 1814.725015] [] do_vfs_ioctl+0xa4/0xa80 [ 1814.725015] [] ? sub_preempt_count+0x7d/0xa0 [ 1814.725015] [] ? vfsmount_lock_local_unlock+0x58/0xb0 [ 1814.725015] [] ? mntput_no_expire+0x59/0x290 [ 1814.725015] [] ? sys_semctl+0xe3/0x140 [ 1814.725015] [] sys_ioctl+0x76/0xd0 [ 1814.725015] [] sysenter_do_call+0x12/0x2b [ 1814.725015] [] ? do_one_pass+0x4f9/0x8e0 [ 1814.725015] Code: 60 01 2a c2 01 83 15 64 01 2a c2 00 8b 00 8b 10 89 f0 e8 19 ff ff ff 83 05 68 01 2a c2 01 83 15 6c 01 2a c2 00 8b 46 04 8b 53 f4 <89> 42 04 89 10 89 f0 c7 43 f4 00 01 10 00 c7 46 04 00 02 20 00 [ 1814.725015] EIP: [] dm_put_device+0x6b/0xa0 SS:ESP 0068:f5b8fd40 [ 1814.725015] CR2: 0000000000000004 [ 1814.736052] ---[ end trace 798168b08048292f ]---
why need the dm-cache?
I'm interested in device-mapper, so I want to do something in this framework. I'm also interested in the "dm-cache", but I have a question that where can I use the dm-cache ? What's the goal of dm-cache?
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