Re: slub: Lockout validation scans during freeing of object

From: Markus Trippelsdorf
Date: Tue Nov 22 2011 - 13:55:44 EST

On 2011.11.22 at 11:40 -0600, Christoph Lameter wrote:
> On Tue, 22 Nov 2011, Eric Dumazet wrote:
>
> > This seems better, but I still have some warnings :
>
> Trying to reproduce with a kernel configured to do preempt. This is
> actually quite interesting since its always off by 1.

BTW there are some obvious overflows in the "slabinfo -l" output on my machine:

Name Objects Objsize Space Slabs/Part/Cpu O/S O %Fr %Ef Flg
:t-0000024 680 24 16.3K 0/0/4 170 0 0 99 *
:t-0000032 768 32 24.5K 0/0/6 128 0 0 100 *
:t-0000040 1632 40 65.5K 13/0/3 102 0 0 99 *
:t-0000048 4533 48 241.6K 18446744073709551583/9/92 85 0 15 90 *
:t-0000064 3392 64 217.0K 30/0/23 64 0 0 100 *
:t-0000072 4368 72 319.4K 73/0/5 56 0 0 98 *
:t-0000112 720 112 81.9K 0/0/20 36 0 0 98 *
:t-0000128 1684 128 233.4K 18446744073709551607/7/66 32 0 12 92 *
:t-0000136 120 136 16.3K 0/0/4 30 0 0 99 *
:t-0000144 8036 144 1.1M 283/0/4 28 0 0 98 *
:t-0000192 4452 192 872.4K 165/0/48 21 0 0 97 *
:t-0000216 90 216 20.4K 1/0/4 18 0 0 94 *
:t-0000256 539 256 147.4K 18446744073709551609/3/43 16 0 8 93 *
:t-0000320 2425 320 794.6K 93/0/4 25 1 0 97 *A
:t-0000400 60 400 24.5K 0/0/3 20 1 0 97 *
:t-0000512 640 512 327.6K 23/0/17 16 1 0 100 *
:t-0000704 483 704 344.0K 0/0/21 23 2 0 98 *A
:t-0001024 373 1024 475.1K 15/10/14 16 2 34 80 *
:t-0002048 288 2048 589.8K 10/0/8 16 3 0 100 *
:t-0004096 119 4096 524.2K 4/3/12 8 3 18 92 *
Acpi-State 204 80 16.3K 0/0/4 51 0 0 99
anon_vma 3528 64 258.0K 9/0/54 56 0 0 87
bdev_cache 84 728 65.5K 0/0/4 21 2 0 93 Aa
blkdev_queue 38 1664 65.5K 0/0/2 19 3 0 96
blkdev_requests 161 344 57.3K 0/0/7 23 1 0 96
buffer_head 1014 104 106.4K 5/0/21 39 0 0 99 a
cfq_queue 102 232 24.5K 1/0/5 17 0 0 96
dentry 15897 192 3.1M 723/0/34 21 0 0 98 a
idr_layer_cache 390 544 212.9K 8/0/5 30 2 0 99
inode_cache 6448 512 3.4M 199/0/9 31 2 0 96 a
ip_fib_trie 219 56 12.2K 0/0/3 73 0 0 99
kmalloc-16 3072 16 49.1K 7/0/5 256 0 0 100
kmalloc-8 4608 8 36.8K 4/0/5 512 0 0 100
kmalloc-8192 20 8192 163.8K 1/0/4 4 3 0 100
kmalloc-96 840 96 81.9K 7/0/13 42 0 0 98
kmem_cache 21 192 4.0K 0/0/1 21 0 0 98 *A
kmem_cache_node 192 64 12.2K 0/0/3 64 0 0 100 *A
mm_struct 171 832 147.4K 0/0/9 19 2 0 96 A
mqueue_inode_cache 19 800 16.3K 0/0/1 19 2 0 92 A
nf_conntrack_ffffffff8199e380 60 264 16.3K 0/0/2 30 1 0 96
proc_inode_cache 420 576 245.7K 2/0/13 28 2 0 98 a
radix_tree_node 3472 560 2.0M 120/0/4 28 2 0 95 a
RAW 42 712 32.7K 0/0/2 21 2 0 91 A
shmem_inode_cache 1036 576 606.2K 21/0/16 28 2 0 98
sighand_cache 210 2088 458.7K 3/0/11 15 3 0 95 A
signal_cache 268 920 360.4K 18446744073709551614/7/24 17 2 31 68 A
sigqueue 125 160 20.4K 0/0/5 25 0 0 97
skbuff_fclone_cache 72 420 32.7K 0/0/4 18 1 0 92 A
sock_inode_cache 196 560 114.6K 0/0/7 28 2 0 95 Aa
task_struct 215 1504 557.0K 9/9/8 21 3 52 58
TCP 21 1504 32.7K 0/0/1 21 3 0 96 A
UDP 63 736 49.1K 0/0/3 21 2 0 94 A
vm_area_struct 3278 168 602.1K 89/33/58 24 0 22 91
xfs_btree_cur 76 208 16.3K 0/0/4 19 0 0 96
xfs_buf_item 108 224 24.5K 0/0/6 18 0 0 98
xfs_da_state 64 488 32.7K 0/0/4 16 1 0 95
xfs_inode 7055 896 6.7M 411/0/4 17 2 0 92 Aa
xfs_log_ticket 80 200 16.3K 0/0/4 20 0 0 97
xfs_trans 116 280 32.7K 0/0/4 29 1 0 99


--
Markus
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