...
crash 'help' command provides further information.
More Crash Commands
| Code Block |
|---|
# show where the kernel memory is allocated
crash> kmem -s
...
ffff88007fa809c0 idr_layer_cache 544 294 301 43 4k
ffff88007fa60980 size-4194304(DMA) 4194304 0 0 0 4096k
ffff88007fa50940 size-4194304 4194304 0 0 0 4096k
ffff88007fa40900 size-2097152(DMA) 2097152 0 0 0 2048k
ffff88007fa308c0 size-2097152 2097152 1 1 1 2048k
ffff88007fa20880 size-1048576(DMA) 1048576 0 0 0 1024k
ffff88007fa10840 size-1048576 1048576 64 64 64 1024k
ffff88007fa00800 size-524288(DMA) 524288 0 0 0 512k
ffff88007f9f07c0 size-524288 524288 0 0 0 512k
ffff88007f9e0780 size-262144(DMA) 262144 0 0 0 256k
ffff88007f9d0740 size-262144 262144 64 64 64 256k
ffff88007f9c0700 size-131072(DMA) 131072 0 0 0 128k
ffff88007f9b06c0 size-131072 131072 7 7 7 128k
ffff88007f9a0680 size-65536(DMA) 65536 0 0 0 64k
ffff88007f990640 size-65536 65536 3 3 3 64k
ffff88007f980600 size-32768(DMA) 32768 0 0 0 32k
ffff88007f9705c0 size-32768 32768 26 26 26 32k
ffff88007f960580 size-16384(DMA) 16384 0 0 0 16k
ffff88007f950540 size-16384 16384 24 26 26 16k
ffff88007f940500 size-8192(DMA) 8192 0 0 0 8k
ffff88007f9304c0 size-8192 8192 839 844 844 8k
ffff88007f920480 size-4096(DMA) 4096 0 0 0 4k
ffff88007f910440 size-4096 4096 702 735 735 4k
ffff88007f900400 size-2048(DMA) 2048 0 0 0 4k
ffff88007f8f03c0 size-2048 2048 791 862 431 4k
ffff88007f8e0380 size-1024(DMA) 1024 0 0 0 4k
ffff88007f8d0340 size-1024 1024 1966 2188 547 4k
ffff88007f8c0300 size-512(DMA) 512 0 0 0 4k
ffff88007f8b02c0 size-512 512 2326695 2326704 290838 4k
ffff88007f8a0280 size-256(DMA) 256 0 0 0 4k
ffff88007f890240 size-256 256 1162648 1162650 77510 4k
ffff88007f880200 size-192(DMA) 192 0 0 0 4k
ffff88007f8701c0 size-192 192 3900 6340 317 4k
ffff88007f860180 size-128(DMA) 128 0 0 0 4k
ffff88007f850140 size-64(DMA) 64 0 0 0 4k
ffff88007f840100 size-64 64 12403 13983 237 4k
ffff88007f8300c0 size-32(DMA) 32 0 0 0 4k
ffff88007f810080 size-128 128 295891 295920 9864 4k
ffff88007f800040 size-32 32 1181468 1181488 10549 4k
ffffffff81ad3620 kmem_cache 32896 240 240 240 64k
# Show all the memory blocks which are
crash> kmem -S <memory address>
# example:
crash> kmem -S ffff88007f8d0340
CACHE NAME OBJSIZE ALLOCATED TOTAL SLABS SSIZE
ffff88007f8d0340 size-1024 1024 1966 2188 547 4k
SLAB MEMORY TOTAL ALLOCATED FREE
ffff880037e52e40 ffff880059b90000 4 0 4
FREE / [ALLOCATED]
ffff880059b90000 (shared cache)
ffff880059b90400 (shared cache)
ffff880059b90800 (shared cache)
ffff880059b90c00
SLAB MEMORY TOTAL ALLOCATED FREE
ffff880044f9a600 ffff880044f62000 4 1 3
FREE / [ALLOCATED]
ffff880044f62000 (shared cache)
ffff880044f62400
[ffff880044f62800]
ffff880044f62c00 (shared cache)
# Each address listed is the beginning of an allocation. Potentially you can print the memory at this address to see what it contains.
# example:
crash> lnet_msg_t ffff880044f62800
# or
# print memory at 64 byte increments starting at address and print 23 64 bytes.
crash> rd -64 ffff88007f82a800 23
# You can pipe the output to 'tail' to see the tail end of the output.
|