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This is a Module debug tool of the Solaris to other popular operating systems, such as Linux systems.
Now, it only just can use correctly dcmds commands related to libumem memory management, and there are many HACKs in the code.
byacc
ncurses-devel
efiutil-libefl-devel
libbsd-devel
flex
libumem-devel
cd mdb/common
make all
make install
Start one process with LD_PRELOAD=/usr/lib64/libumem.so.0
//examples: start numad
LD_PRELOAD=/usr/lib64/libumem.so.0 numad
mdb attach target process
//mdb -p target_pid
[root@localhost mdb]# mdb -p `pidof numad`
loading modules: [ libdl-2.28.so libc-2.28.so libm-2.28.so librt-2.28.so libpthread-2.28.so libumem.so.0.0.0 ld-2.28.so ]
use libumem releate dcmds to view memory info
::dcmds
...
umalog - display umem transaction log and stack traces
umastat - umem allocator stats
umausers - display current medium and large users of the umem allocator
umem_cache - print a umem cache
umem_debug - toggle umem dcmd/walk debugging
umem_log - dump umem transaction log
umem_malloc_dist - report distribution of outstanding malloc()s
umem_malloc_info - report information about malloc()s by cache
umem_status - Print umem status and message buffer
umem_verify - check integrity of umem-managed memory
unload - unload debugger module
unset - unset variables
unsetenv - clear an environment variable
vars - print listing of variables
version - print debugger version string
vmem - print a vmem_t
vmem_seg - print or filter a vmem_seg
vtop - print physical mapping of virtual address
....
::findleaks //use findleaks dcmds
BYTES LEAKED VMEM_SEG CALLER
8388608 7 7fc4c74c3000 MMAP
4096 1 7fc4c8e90000 MMAP
8192 1 7fc4c8e8c000 MMAP
20480 1 7fc4c8e71000 MMAP
53248 1 7fc4c8c59000 MMAP
16384 1 7fc4c8a30000 MMAP
16384 1 7fc4c8285000 MMAP
------------------------------------------------------------------------
Total 7 oversized leaks, 8507392 bytes
CACHE LEAKED BUFFER CALLER
00007fc4c8e644c8 1 00007fc4c8e32000 ?
00007fc4c8e67948 1 00007fc4c8e31540 ?
00007fc4c8e684c8 1 00007fc4c8e35b40 ?
00007fc4c8e6a048 2 00007fc4c8e60c00 ?
00007fc4c8e6b048 1 00007fc4c8e5de00 ?
00007fc4c8e6b4c8 1 00007fc4c8e5edc0 ?
00007fc4c8e6f4c8 1 00007fc4c8e5bf60 ?
00007fc4c8e70048 4 00007fc4c8e5af80 ?
00007fc4c8e704c8 4 00007fc4c8e5ff40 ?
00007fc4c8e70948 6 00007fc4c8e62ea0 ?
------------------------------------------------------------------------
Total 22 buffers, 14320 bytes
::umem_cache
ADDR NAME FLAG CFLAG BUFSIZE BUFTOTL
00007fa35a8de048 umem_magazine_1 0000 80080000 16 252
00007fa35a8de4c8 umem_magazine_3 0000 80080000 32 126
00007fa35a8de948 umem_magazine_7 0000 80080000 64 63
00007fa35a8dd048 umem_magazine_15 0000 80080000 128 31
00007fa35a8dd4c8 umem_magazine_31 0000 80080000 256 0
00007fa35a8dd948 umem_magazine_47 0000 80080000 384 0
00007fa35a8dc048 umem_magazine_63 0000 80080000 512 0
00007fa35a8dc4c8 umem_magazine_95 0000 80080000 768 0
00007fa35a8dc948 umem_magazine_143 0000 80080000 1152 0
00007fa35a8db048 umem_slab_cache 0000 80080000 56 63
00007fa35a8db4c8 umem_bufctl_cache 0000 80080000 24 126
00007fa35a8db948 umem_bufctl_audit_cache 0000 80080000 192 0
00007fa35a8d8048 umem_va_4096 0200 00110000 4096 32
00007fa35a8d84c8 umem_va_8192 0200 00110000 8192 16
00007fa35a8d8948 umem_va_12288 0200 00110000 12288 0
00007fa35a8d6048 umem_va_16384 0200 00110000 16384 0
00007fa35a8d64c8 umem_va_20480 0200 00110000 20480 0
00007fa35a8d6948 umem_va_24576 0200 00110000 24576 0
00007fa35a8d5048 umem_va_28672 0200 00110000 28672 0
00007fa35a8d54c8 umem_va_32768 0200 00110000 32768 0
00007fa35a8d5948 umem_alloc_8 0000 80000000 8 0
00007fa35a8cd048 umem_alloc_16 0000 80000000 16 252
00007fa35a8cd4c8 umem_alloc_32 0000 80000000 32 126
00007fa35a8cd948 umem_alloc_48 0000 80000000 48 84
00007fa35a8cc048 umem_alloc_64 0000 80000000 64 63
00007fa35a8cc4c8 umem_alloc_80 0000 80000000 80 50
00007fa35a8cc948 umem_alloc_96 0000 80000000 96 42
00007fa35a8cb048 umem_alloc_112 0000 80000000 112 0
00007fa35a8cb4c8 umem_alloc_128 0000 80000000 128 0
00007fa35a8cb948 umem_alloc_160 0000 80000000 160 0
00007fa35a8ca048 umem_alloc_192 0000 80000000 192 0
00007fa35a8ca4c8 umem_alloc_224 0000 80000000 224 0
00007fa35a8ca948 umem_alloc_256 0000 80000000 256 0
00007fa35a8c8048 umem_alloc_320 0000 80000000 320 12
00007fa35a8c84c8 umem_alloc_384 0000 80000000 384 10
00007fa35a8c8948 umem_alloc_448 0000 80000000 448 0
00007fa35a8c7048 umem_alloc_512 0200 80000000 512 8
00007fa35a8c74c8 umem_alloc_640 0200 80000000 640 0
00007fa35a8c7948 umem_alloc_768 0200 80000000 768 0
00007fa35a8c5048 umem_alloc_896 0200 80000000 896 0
00007fa35a8c54c8 umem_alloc_1152 0200 80000000 1152 7
00007fa35a8c5948 umem_alloc_1344 0200 80000000 1344 0
00007fa35a8c4048 umem_alloc_1600 0200 80000000 1600 0
00007fa35a8c44c8 umem_alloc_2048 0200 80000000 2048 0
00007fa35a8c4948 umem_alloc_2688 0200 80000000 2688 3
00007fa35a8c1048 umem_alloc_4096 0200 80000000 4096 0
00007fa35a8c14c8 umem_alloc_8192 0200 80000000 8192 1
00007fa35a8c1948 umem_alloc_12288 0200 80000000 12288 0
00007fa35a8c0048 umem_alloc_16384 0200 80000000 16384 0
::umem_malloc_dist
malloc size ------------------ Distribution ------------------ count
0 | 0
1 |@@ 1
2 | 0
3 | 0
4 | 0
5 | 0
6 | 0
7 | 0
8 |@@@@@@ 3
...
more dcmds ...
quit mdb attach
::quit
The mdb is licensed under Sun's/Oracle's CDDL license. Original copyrights are left intact. No GPL code is incorporated into the release, to avoid legal conflicts.
Any mistakes or omissions in copyright attribution will be my mistake, so please let me know if there are such cases.
If Sun/Oracle migrate to a GPL friendly license, then this port of dmb can follow. I do not own the license or assert any rights on the licensing other than that expected of me as a consumer/supplier.
I have no political affiliation or preference for a licensing scheme, simply that Sun/Oracle has gracefully donated to the community a large body of work.
I reserve the right to change the licensing model for my own code at a later date, when and if someone puts forward a case as to the correct license agreement.
If the code is useful to you - great !. Spread it around and get people to use, debug and enhance it.
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