NAME
kmem - kernel memory
SYNOPSIS
kmem [-f|-F|-c|-C|-i|-v|-V|-n|-z|-o|-h] [-p | -m member[,member]]
[[-s|-S|-S=cpu[s]|-r] [slab] [-I slab[,slab]]] [-g [flags]] [[-P] address]]
DESCRIPTION
This command displays information about the use of kernel memory.
-f displays the contents of the system free memory headers.
also verifies that the page count equals nr_free_pages.
-F same as -f, but also dumps all pages linked to that header.
-c walks through the page_hash_table and verifies page_cache_size.
-C same as -c, but also dumps all pages in the page_hash_table.
-i displays general memory usage information
-v displays the mapped virtual memory regions allocated by vmalloc().
-V displays the kernel vm_stat table if it exists, or in more recent
kernels, the vm_zone_stat, vm_node_stat and vm_numa_stat tables,
the cumulative page_states counter values if they exist, and/or
the cumulative, vm_event_states counter values if they exist.
-n display memory node, memory section, memory block data and state;
the state of each memory section is shown as the following flags:
"P": SECTION_MARKED_PRESENT
"M": SECTION_HAS_MEM_MAP
"O": SECTION_IS_ONLINE
"E": SECTION_IS_EARLY
"D": SECTION_TAINT_ZONE_DEVICE
-z displays per-zone memory statistics.
-o displays each cpu's offset value that is added to per-cpu symbol
values to translate them into kernel virtual addresses.
-h display the address of hugepage hstate array entries, along with
their hugepage size, total and free counts, and name.
-p displays basic information about each page structure in the system
mem_map[] array, made up of the page struct address, its associated
physical address, the page.mapping, page.index, page._count and
page.flags fields.
-m member similar to -p, but displays page structure contents specified by
a comma-separated list of one or more struct page members. The
"flags" member will always be expressed in hexadecimal format, and
the "_count" and "_mapcount" members will always be expressed
in decimal format. Otherwise, all other members will be displayed
in hexadecimal format unless the output radix is 10 and the member
is a signed/unsigned integer. Members that are data structures may
be specified either by the data structure's member name, or expanded
to specify a member of the data structure. For example, "-m lru"
refers to a list_head data structure, and both the list_head.next
and list_head.prev pointer values will be displayed, whereas if
"-m lru.next" is specified, just the list_head.next value will
be displayed.
-s displays basic kmalloc() slab data.
-S displays all kmalloc() slab data, including all slab objects,
and whether each object is in use or is free. If CONFIG_SLUB,
slab data for each per-cpu slab is displayed, along with the
address of each kmem_cache_node, its count of full and partial
slabs, and a list of all tracked slabs.
Note: one can specify the per-cpu slab data to be displayed;
the cpu[s] can be given as "1,3,5", "1-3", "1,3,5-7,10",
"all", or "a" (shortcut for "all").
-r displays the accumulated basic kmalloc() slab data of each
root slab cache and its children. The kernel must contain the
"slab_root_caches" list_head. (currently only available if
CONFIG_SLUB)
slab when used with -s, -S or -r, limits the command to only the slab
cache of name "slab". If the slab argument is "list", then
all slab cache names and addresses are listed.
-I slab when used with -s, -S or -r, one or more slab cache names in a
comma-separated list may be specified as slab caches to ignore.
-g displays the enumerator value of all bits in the page structure's
"flags" field.
flags when used with -g, translates all bits in this hexadecimal page
structure flags value into its enumerator values.
-P declares that the following address argument is a physical address.
address when used without any flag, the address can be a kernel virtual,
or physical address; a search is made through the symbol table,
the kmalloc() slab subsystem, the free list, the page_hash_table,
the vmalloc() region subsystem, the current set of task_structs
and kernel stacks, and the mem_map array. If found in any of
those areas, the information will be dumped in the same manner as
if the location-specific flags were used; if contained within a
current task_struct or kernel stack, that task's context will be
displayed.
address when used with -s or -S, searches the kmalloc() slab subsystem
for the slab containing of this virtual address, showing whether
it is in use or free.
address when used with -f, the address can be either a page pointer,
a physical address, or a kernel virtual address; the free_area
header containing the page (if any) is displayed.
address when used with -p, the address can be either a page pointer, a
physical address, or a kernel virtual address; its basic mem_map
page information is displayed.
address when used with -m, the address can be either a page pointer, a
physical address, or a kernel virtual address; the specified
members of the associated page struct are displayed.
address when used with -c, the address must be a page pointer address;
the page_hash_table entry containing the page is displayed.
address when used with -l, the address must be a page pointer address;
the page address is displayed if it is contained with the list.
address when used with -v, the address can be a mapped kernel virtual
address or physical address; the mapped region containing the
address is displayed.
All address arguments above must be expressed in hexadecimal format.
EXAMPLES
Display memory usage information:
crash> kmem -i
PAGES TOTAL PERCENTAGE
TOTAL MEM 1974231 7.5 GB ----
FREE 208962 816.3 MB 10% of TOTAL MEM
USED 1765269 6.7 GB 89% of TOTAL MEM
SHARED 365066 1.4 GB 18% of TOTAL MEM
BUFFERS 111376 435.1 MB 5% of TOTAL MEM
CACHED 1276196 4.9 GB 64% of TOTAL MEM
SLAB 120410 470.4 MB 6% of TOTAL MEM
TOTAL HUGE 524288 2 GB ----
HUGE FREE 524288 2 GB 100% of TOTAL HUGE
TOTAL SWAP 2498559 9.5 GB ----
SWAP USED 81978 320.2 MB 3% of TOTAL SWAP
SWAP FREE 2416581 9.2 GB 96% of TOTAL SWAP
COMMIT LIMIT 3485674 13.3 GB ----
COMMITTED 850651 3.2 GB 24% of TOTAL LIMIT
Display and verify free memory data:
crash> kmem -f
NODE
0
ZONE NAME SIZE FREE MEM_MAP START_PADDR START_MAPNR
0 DMA 4096 3372 c4000040 0 0
AREA SIZE FREE_AREA_STRUCT BLOCKS PAGES
0 4k c02eb004 2 2
1 8k c02eb010 3 6
2 16k c02eb01c 5 20
3 32k c02eb028 4 32
4 64k c02eb034 5 80
5 128k c02eb040 3 96
6 256k c02eb04c 3 192
7 512k c02eb058 1 128
8 1024k c02eb064 1 256
9 2048k c02eb070 5 2560
ZONE NAME SIZE FREE MEM_MAP START_PADDR START_MAPNR
1 Normal 225280 202269 c4044040 1000000 4096
AREA SIZE FREE_AREA_STRUCT BLOCKS PAGES
0 4k c02eb0b8 1 1
1 8k c02eb0c4 2 4
2 16k c02eb0d0 0 0
3 32k c02eb0dc 1 8
4 64k c02eb0e8 1 16
5 128k c02eb0f4 0 0
6 256k c02eb100 0 0
7 512k c02eb10c 0 0
8 1024k c02eb118 0 0
9 2048k c02eb124 395 202240
ZONE NAME SIZE FREE MEM_MAP START_PADDR START_MAPNR
2 HighMem 819200 748686 c4ee0040 38000000 229376
AREA SIZE FREE_AREA_STRUCT BLOCKS PAGES
0 4k c02eb16c 10 10
1 8k c02eb178 2 4
2 16k c02eb184 0 0
3 32k c02eb190 2 16
4 64k c02eb19c 1 16
5 128k c02eb1a8 1 32
6 256k c02eb1b4 1 64
7 512k c02eb1c0 0 0
8 1024k c02eb1cc 0 0
9 2048k c02eb1d8 1462 748544
nr_free_pages: 954327 (verified)
Dump all the base addresses of each free memory area from above:
crash> kmem -F
NODE
0
ZONE NAME SIZE FREE MEM_MAP START_PADDR START_MAPNR
0 DMA 4096 3372 c4000040 0 0
AREA SIZE FREE_AREA_STRUCT
0 4k c02eb004
c400ded8
c4042528
AREA SIZE FREE_AREA_STRUCT
1 8k c02eb010
c400de50
c400cee8
c40424a0
AREA SIZE FREE_AREA_STRUCT
2 16k c02eb01c
c400dd40
c400cf70
c40425b0
c400f7d0
c40028a0
AREA SIZE FREE_AREA_STRUCT
3 32k c02eb028
c4042280
c400f8e0
c4002680
c4000260
AREA SIZE FREE_AREA_STRUCT
4 64k c02eb034
c400d080
c4041e40
...
Dump the mem_map[] array:
crash> kmem -p
PAGE PHYSICAL MAPPING INDEX CNT FLAGS
f5c51200 10000 0 0 1 80 slab
f5c51220 11000 0 0 1 80 slab
f5c51240 12000 0 0 1 80 slab
f5c51260 13000 0 0 1 80 slab
f5c51280 14000 0 0 1 80 slab
f5c512a0 15000 0 0 1 80 slab
f5c512c0 16000 0 0 1 80 slab
f5c512e0 17000 0 0 1 80 slab
f5c51300 18000 0 0 1 80 slab
f5c51320 19000 0 0 1 80 slab
f5c51340 1a000 0 0 1 80 slab
f5c51360 1b000 0 0 1 80 slab
f5c51380 1c000 e6c6a754 13b67 2 868 uptodate,lru,active,private
f5c513a0 1d000 0 0 1 80 slab
f5c513c0 1e000 0 0 1 80 slab
f5c513e0 1f000 0 0 1 80 slab
f5c51400 20000 e6c6a754 13bbb 2 868 uptodate,lru,active,private
f5c51420 21000 0 0 1 80 slab
f5c51440 22000 0 0 1 80 slab
...
Display the "page.lru" list_head structure member in each page:
crash> kmem -m lru
PAGE lru
ffffea0000000000 0000000000000000,0000000000000000
ffffea0000000040 ffffea0000000060,ffffea0000000060
ffffea0000000080 ffffea00000000a0,ffffea00000000a0
ffffea00000000c0 ffffea00000000e0,ffffea00000000e0
ffffea0000000100 ffffea0000000120,ffffea0000000120
ffffea0000000140 ffffea0000000160,ffffea0000000160
ffffea0000000180 ffffea00000001a0,ffffea00000001a0
ffffea00000001c0 ffffea00000001e0,ffffea00000001e0
ffffea0000000200 ffffea0000000220,ffffea0000000220
ffffea0000000240 ffffea0000000260,ffffea0000000260
ffffea0000000280 ffffea00000002a0,ffffea00000002a0
ffffea00000002c0 ffffea00000002e0,ffffea00000002e0
ffffea0000000300 ffffea0000000320,ffffea0000000320
ffffea0000000340 ffffea0000000360,ffffea0000000360
ffffea0000000380 ffffea00000003a0,ffffea00000003a0
ffffea00000003c0 ffffea00000003e0,ffffea00000003e0
ffffea0000000400 ffff88021e5e41e8,ffffea0000002020
ffffea0000000440 dead000000100100,dead000000200200
ffffea0000000480 dead000000100100,dead000000200200
ffffea00000004c0 dead000000100100,dead000000200200
...
Find the two pages that link to the page at ffffea0001dafb20
via their page.lru list_head's next and prev pointers:
crash> kmem -m lru | grep ffffea0001dafb20
ffffea000006b500 ffffea0001dafb20,ffffea0001eb4520
ffffea0000127d80 ffffea000152b620,ffffea0001dafb20
Find all of the combined slab/page structures that are used by
the kmalloc-8192 slab cache:
crash> kmem -s kmalloc-8192
CACHE OBJSIZE ALLOCATED TOTAL SLABS SSIZE NAME
ffff880215802e00 8192 65 80 20 32k kmalloc-8192
crash> kmem -m slab_cache | grep ffff880215802e00
ffffea0004117800 ffff880215802e00
ffffea00041ca600 ffff880215802e00
ffffea00044ab200 ffff880215802e00
ffffea0004524000 ffff880215802e00
ffffea0004591600 ffff880215802e00
ffffea00047eac00 ffff880215802e00
ffffea0004875800 ffff880215802e00
ffffea0008357a00 ffff880215802e00
ffffea0008362a00 ffff880215802e00
ffffea00083b9400 ffff880215802e00
ffffea00083c1000 ffff880215802e00
ffffea00083c1e00 ffff880215802e00
ffffea00083c2000 ffff880215802e00
ffffea00083c2a00 ffff880215802e00
ffffea00083d2000 ffff880215802e00
ffffea00083d3e00 ffff880215802e00
ffffea0008407c00 ffff880215802e00
ffffea000848ce00 ffff880215802e00
ffffea0008491800 ffff880215802e00
ffffea00084bf800 ffff880215802e00
Use the commands above with a page pointer or a physical address argument:
crash> kmem -f c40425b0
NODE
0
ZONE NAME SIZE FREE MEM_MAP START_PADDR START_MAPNR
0 DMA 4096 3372 c4000040 0 0
AREA SIZE FREE_AREA_STRUCT
2 16k c02eb01c
c40425b0 (c40425b0 is 1st of 4 pages)
crash> kmem -p c25a9c00
PAGE PHYSICAL MAPPING INDEX CNT FLAGS
c25a9c00 1fe0000 f429d2e4 21fe3eb 2 800828 uptodate,lru,private
crash> kmem -p 1fe0000
PAGE PHYSICAL MAPPING INDEX CNT FLAGS
c25a9c00 1fe0000 f429d2e4 21fe3eb 2 800828 uptodate,lru,private
Display the mapped memory regions allocated by vmalloc():
crash> kmem -v
VMAP_AREA VM_STRUCT ADDRESS RANGE SIZE
f7048e00 f7048e40 f7dfe000 - f7e00000 8192
f7048ec0 f7048f00 f7e00000 - f7e05000 20480
f7151fc0 f7159540 f7e06000 - f7e08000 8192
f704da80 f704dac0 f7e0a000 - f7e0c000 8192
f704d980 f704d9c0 f7e0e000 - f7e10000 8192
f724f1c0 f724f200 f7e12000 - f7e14000 8192
f704d840 f704d880 f7e14000 - f7e17000 12288
f704d400 f704d440 f7e18000 - f7e1d000 20480
f73f5840 f73f5880 f7e1e000 - f7e2a000 49152
f6334480 f63344c0 f7e2c000 - f7e2e000 8192
f635d600 f635d640 f7e4a000 - f7e5b000 69632
f41b4700 f5771a40 f7e6e000 - f7e70000 8192
f622f6c0 f622f700 f7e71000 - f7e79000 32768
f63a9f00 f63a9f40 f7e84000 - f7e87000 12288
f63a9d00 f63a9d40 f7e8f000 - f7e91000 8192
f5546480 f39db800 f7eb8000 - f7ec2000 40960
f5ce9640 f5777e80 f7ec6000 - f7ed1000 45056
f63a9b00 f63a9b40 f7ed1000 - f7efd000 180224
f63a9800 f63a9840 f7f1d000 - f7f26000 36864
f63a9640 f63a9880 f7f43000 - f7f52000 61440
f5771f00 f4183840 f7f53000 - f7f64000 69632
f5ce9a00 f30c4a00 f7fcf000 - f801e000 323584
f63a93c0 f63a9400 f805d000 - f8132000 872448
f63a91c0 f63a95c0 f814b000 - f8150000 20480
f63a9140 f63a9180 f8151000 - f8352000 2101248
f624eb00 f624eb40 f8353000 - f8355000 8192
f563eb40 f563eb80 f8356000 - f835e000 32768
f63d5ec0 f63d5f00 f8360000 - f8371000 69632
f63d5cc0 f6287b80 f83c2000 - f84c3000 1052672
...
Dump the virtual memory statistics:
crash> kmem -V
VM_ZONE_STAT:
NR_FREE_PAGES: 30085
NR_ZONE_INACTIVE_ANON: 1985
NR_ZONE_ACTIVE_ANON: 338275
NR_ZONE_INACTIVE_FILE: 19760
NR_ZONE_ACTIVE_FILE: 12018
NR_ZONE_UNEVICTABLE: 0
NR_ZONE_WRITE_PENDING: 4
NR_MLOCK: 0
NR_PAGETABLE: 1562
NR_KERNEL_STACK_KB: 1728
NR_BOUNCE: 0
NR_FREE_CMA_PAGES: 0
VM_NODE_STAT:
NR_INACTIVE_ANON: 1985
NR_ACTIVE_ANON: 338275
NR_INACTIVE_FILE: 19760
NR_ACTIVE_FILE: 12018
NR_UNEVICTABLE: 0
NR_SLAB_RECLAIMABLE: 3111
NR_SLAB_UNRECLAIMABLE: 3039
NR_ISOLATED_ANON: 0
NR_ISOLATED_FILE: 0
WORKINGSET_REFAULT: 0
WORKINGSET_ACTIVATE: 0
WORKINGSET_NODERECLAIM: 0
NR_ANON_MAPPED: 338089
NR_FILE_MAPPED: 8102
NR_FILE_PAGES: 33949
NR_FILE_DIRTY: 4
NR_WRITEBACK: 0
NR_WRITEBACK_TEMP: 0
NR_SHMEM: 2171
NR_SHMEM_THPS: 0
NR_SHMEM_PMDMAPPED: 0
NR_ANON_THPS: 86
NR_UNSTABLE_NFS: 0
NR_VMSCAN_WRITE: 0
NR_VMSCAN_IMMEDIATE: 0
NR_DIRTIED: 155
NR_WRITTEN: 75
VM_NUMA_STAT:
NUMA_HIT: 575409
NUMA_MISS: 0
NUMA_FOREIGN: 0
NUMA_INTERLEAVE_HIT: 12930
NUMA_LOCAL: 575409
NUMA_OTHER: 0
VM_EVENT_STATES:
PGPGIN: 282492
PGPGOUT: 6773
PSWPIN: 0
PSWPOUT: 0
PGALLOC_DMA: 0
PGALLOC_DMA32: 693092
PGALLOC_NORMAL: 0
...
Display hugepage hstate information:
crash> kmem -h
HSTATE SIZE FREE TOTAL NAME
ffffffff81f7a800 2MB 10 64 hugepages-2048kB
Determine (and verify) the page cache size:
crash> kmem -c
page_cache_size: 18431 (verified)
Dump all pages in the page_hash_table:
crash> kmem -C
page_hash_table[0]
c0325b40
c03a0598
c03b4070
c0364c28
c0357690
c02ef338
c02d7c60
c02c11e0
c02a3d70
page_hash_table[1]
c0394ce8
c03c4218
c03b4048
c0364c00
c0357668
c02d6e50
c02d7dc8
c02c0cb8
c02db630
c02ebad0
page_hash_table[2]
c037e808
c034e248
c03b4020
c02ec868
c03baa60
...
page_hash_table[2047]
c033a798
c0390b48
c03b4098
c0364890
c03576b8
c02d2c38
c02d7c88
c02de5d8
page_cache_size: 18437 (verified)
Find the page_hash_table entry containing page c03576b8:
crash> kmem -c c03576b8
page_hash_table[2047]
c03576b8
Display kmalloc() slab data:
crash> kmem -s
CACHE OBJSIZE ALLOCATED TOTAL SLABS SSIZE NAME
c02eadc0 232 58 68 4 4k kmem_cache
f79c2888 128 0 0 0 4k ip_vs_conn
f79c2970 96 0 0 0 4k tcp_tw_bucket
f79c2a58 32 12 565 5 4k tcp_bind_bucket
f79c2b40 64 0 59 1 4k tcp_open_request
f79c2c28 64 1 59 1 4k inet_peer_cache
f79c2d10 32 11 339 3 4k ip_fib_hash
f79c2df8 160 8 120 5 4k ip_dst_cache
f79c2ee0 128 1 30 1 4k arp_cache
c8402970 96 30208 37800 945 4k blkdev_requests
c8402a58 384 0 0 0 4k nfs_read_data
c8402b40 384 0 0 0 4k nfs_write_data
c8402c28 96 0 0 0 4k nfs_page
c8402d10 20 0 0 0 4k dnotify cache
c8402df8 92 3 336 8 4k file lock cache
c8402ee0 16 0 0 0 4k fasync cache
c84027a0 32 3 339 3 4k uid_cache
c84026b8 160 320 624 26 4k skbuff_head_cache
c84025d0 832 32 180 20 8k sock
c84024e8 132 0 203 7 4k sigqueue
c8402400 64 19 472 8 4k cdev_cache
c8402318 64 8 236 4 4k bdev_cache
c8402230 96 11 120 3 4k mnt_cache
c8402148 480 817 848 106 4k inode_cache
c8402060 128 1352 1470 49 4k dentry_cache
c8403ee0 96 244 440 11 4k filp
c8403df8 4096 0 12 12 4k names_cache
c8403d10 96 14936 16000 400 4k buffer_head
c8403c28 128 25 240 8 4k mm_struct
c8403b40 64 393 1298 22 4k vm_area_struct
c8403a58 64 30 472 8 4k fs_cache
c8403970 416 30 135 15 4k files_cache
c8403888 1312 32 99 33 4k signal_act
c84037a0 131072 0 0 0 128k size-131072(DMA)
c84036b8 131072 1 1 1 128k size-131072
c84035d0 65536 0 0 0 64k size-65536(DMA)
c84034e8 65536 0 0 0 64k size-65536
c8403400 32768 0 0 0 32k size-32768(DMA)
c8403318 32768 0 1 1 32k size-32768
c8403230 16384 0 0 0 16k size-16384(DMA)
c8403148 16384 0 0 0 16k size-16384
c8403060 8192 0 0 0 8k size-8192(DMA)
c8401ee0 8192 1 2 2 8k size-8192
c8401df8 4096 0 0 0 4k size-4096(DMA)
c8401d10 4096 30 30 30 4k size-4096
c8401c28 2048 0 0 0 4k size-2048(DMA)
c8401b40 2048 37 132 66 4k size-2048
c8401a58 1024 0 0 0 4k size-1024(DMA)
c8401970 1024 301 328 82 4k size-1024
c8401888 512 0 0 0 4k size-512(DMA)
c84017a0 512 141 168 21 4k size-512
c84016b8 256 0 0 0 4k size-256(DMA)
c84015d0 256 80 435 29 4k size-256
c84014e8 128 0 0 0 4k size-128(DMA)
c8401400 128 508 840 28 4k size-128
c8401318 64 0 0 0 4k size-64(DMA)
c8401230 64 978 1357 23 4k size-64
c8401148 32 0 0 0 4k size-32(DMA)
c8401060 32 1244 1808 16 4k size-32
Display all slab data in the "arp_cache" cache:
crash> kmem -S arp_cache
CACHE OBJSIZE ALLOCATED TOTAL SLABS SSIZE NAME
f79c2ee0 128 1 30 1 4k arp_cache
SLAB MEMORY TOTAL ALLOCATED FREE
f729d000 f729d0a0 30 1 29
FREE / [ALLOCATED]
f729d0a0 (cpu 7 cache)
f729d120 (cpu 7 cache)
f729d1a0 (cpu 7 cache)
f729d220 (cpu 7 cache)
f729d2a0 (cpu 7 cache)
f729d320 (cpu 7 cache)
f729d3a0 (cpu 7 cache)
f729d420 (cpu 7 cache)
f729d4a0 (cpu 7 cache)
f729d520 (cpu 7 cache)
f729d5a0 (cpu 7 cache)
f729d620 (cpu 7 cache)
f729d6a0 (cpu 7 cache)
f729d720 (cpu 7 cache)
f729d7a0 (cpu 7 cache)
f729d820 (cpu 7 cache)
f729d8a0 (cpu 7 cache)
f729d920 (cpu 7 cache)
f729d9a0 (cpu 7 cache)
f729da20 (cpu 7 cache)
f729daa0 (cpu 7 cache)
f729db20 (cpu 7 cache)
f729dba0 (cpu 7 cache)
f729dc20 (cpu 7 cache)
f729dca0 (cpu 7 cache)
f729dd20 (cpu 7 cache)
f729dda0 (cpu 7 cache)
f729de20 (cpu 7 cache)
f729dea0 (cpu 3 cache)
[f729df20]
Search the kmalloc() slab subsystem for address c3fbdb60:
crash> kmem -s c3fbdb60
CACHE OBJSIZE ALLOCATED TOTAL SLABS SSIZE NAME
c8402970 96 30208 37800 945 4k blkdev_requests
SLAB MEMORY TOTAL ALLOCATED FREE
c3fbd020 c3fbd0e0 40 40 0
FREE / [ALLOCATED]
[c3fbdb60]
Make a generic search (no flags) for the same address c3fbdb60:
crash> kmem c3fbdb60
CACHE OBJSIZE ALLOCATED TOTAL SLABS SSIZE NAME
c8402970 96 30208 37800 945 4k blkdev_requests
SLAB MEMORY TOTAL ALLOCATED FREE
c3fbd020 c3fbd0e0 40 40 0
FREE / [ALLOCATED]
[c3fbdb60]
PAGE PHYSICAL MAPPING INDEX CNT FLAGS
c410ee74 3fbd000 0 0 1 slab
Display memory node data (if supported):
crash> kmem -n
NODE SIZE PGLIST_DATA BOOTMEM_DATA NODE_ZONES
0 262095 ffff88003d52a000 ---- ffff88003d52a000
ffff88003d52a740
ffff88003d52ae80
ffff88003d52b5c0
MEM_MAP START_PADDR START_MAPNR
ffffea0000000040 1000 1
ZONE NAME SIZE MEM_MAP START_PADDR START_MAPNR
0 DMA 4095 ffffea0000000040 1000 1
1 DMA32 258000 ffffea0000040000 1000000 4096
2 Normal 0 0 0 0
3 Movable 0 0 0 0
-------------------------------------------------------------------
NR SECTION CODED_MEM_MAP MEM_MAP STATE PFN
0 ffff88003d4d9000 ffffea0000000000 ffffea0000000000 PM 0
1 ffff88003d4d9020 ffffea0000000000 ffffea0000200000 PM 32768
2 ffff88003d4d9040 ffffea0000000000 ffffea0000400000 PM 65536
3 ffff88003d4d9060 ffffea0000000000 ffffea0000600000 PM 98304
4 ffff88003d4d9080 ffffea0000000000 ffffea0000800000 PM 131072
5 ffff88003d4d90a0 ffffea0000000000 ffffea0000a00000 PM 163840
6 ffff88003d4d90c0 ffffea0000000000 ffffea0000c00000 PM 196608
7 ffff88003d4d90e0 ffffea0000000000 ffffea0000e00000 PM 229376
MEM_BLOCK NAME PHYSICAL RANGE STATE START_SECTION_NO
ffff88003a707c00 memory0 0 - 7ffffff ONLINE 0
ffff88003a6e0000 memory1 8000000 - fffffff ONLINE 1
ffff88003a6e1000 memory2 10000000 - 17ffffff ONLINE 2
ffff88003a6e1400 memory3 18000000 - 1fffffff ONLINE 3
ffff88003a6e1800 memory4 20000000 - 27ffffff ONLINE 4
ffff88003a6e0400 memory5 28000000 - 2fffffff ONLINE 5
ffff88003a6e0800 memory6 30000000 - 37ffffff ONLINE 6
ffff88003a6e0c00 memory7 38000000 - 3fffffff ONLINE 7
Translate a page structure's flags field contents:
crash> kmem -g 4080
FLAGS: 4080
PAGE-FLAG BIT VALUE
PG_slab 7 0000080
PG_head 14 0004000
crash>
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