slab/slub main data structures

name          <active_objs> <num_objs> <objsize> <objperslab> <pagesperslab> : tunables <limit> <batchcount> <sharedfactor> : slabdata <active_slabs> <num_slabs> <sharedavail>
mlx5_fs_ftes     615            615       392         41            4        : tunables    0          0            0        : slabdata     15             15          0

crash> struct kmem_cache 0xffff8807fe2b6100
struct kmem_cache {
cpu_slab = 0x60f80160ada0,
flags = 0x40000000,
min_partial = 0x5,
size = 0x188,
object_size = 0x188,       <== 0x188 = 392 objsize
offset = 0x0,
cpu_partial = 0xd,
oo = {
x = 0x20029
},
max = {
x = 0x20029
},
min = {
x = 0xa
},
allocflags = 0x4000,
refcount = 0x5,
ctor = 0x0,
inuse = 0x188,
align = 0x8,
reserved = 0x0,
red_left_pad = 0x0,
name = 0xffff8807cdd3c350 "mlx5_fs_ftes",
list = {
next = 0xffff8807fe2b5e68,
prev = 0xffff8807fe2b62e8
},
kobj = {
name = 0xffff8807cdd3c340 ":0000392",
entry = {
next = 0xffff8807fe2b6300,
prev = 0xffff8807fe2b5e80
},
parent = 0xffff8807da8ba4f8,
kset = 0xffff8807da8ba4e0,
ktype = 0xffffffff8206fd20 <slab_ktype>,
sd = 0xffff8807d591d000,
kref = {
refcount = {
refs = {
counter = 0x1
}
}
},
state_initialized = 0x1,
state_in_sysfs = 0x1,
state_add_uevent_sent = 0x1,
state_remove_uevent_sent = 0x0,
uevent_suppress = 0x0
},
kobj_remove_work = {
data = {
counter = 0xfffffffe0
},
entry = {
next = 0xffff8807fe2b61c0,
prev = 0xffff8807fe2b61c0
},
func = 0xffffffff812081d0 <sysfs_slab_remove_workfn>
},
memcg_params = {
root_cache = 0x0,
{
{
memcg_caches = 0xffff8807274b89c0,
__root_caches_node = {
next = 0xffff8807fe2b5ee8,
prev = 0xffff8807fe2b6368
},
children = {
next = 0xffff8807fe2b61f8,
prev = 0xffff8807fe2b61f8
}
},
{
memcg = 0xffff8807274b89c0,
children_node = {
next = 0xffff8807fe2b5ee8,
prev = 0xffff8807fe2b6368
},
kmem_caches_node = {
next = 0xffff8807fe2b61f8,
prev = 0xffff8807fe2b61f8
},
deact_fn = 0x0,
{
deact_rcu_head = {
next = 0x0,
func = 0x0
},
deact_work = {
data = {
counter = 0x0
},
entry = {
next = 0x0,
prev = 0x0
},
func = 0x0
}
}
}
}
},
max_attr_size = 0x0,
memcg_kset = 0x0,
useroffset = 0x0,
usersize = 0x0,
node = {0xffff8807d3fb4000}
}
crash> struct kmem_cache_cpu 0x60f80160ada0:a
[0]: ffffe8ffffa0ada0
struct kmem_cache_cpu {
freelist = 0xffff8807165bd3e8,
tid = 0xc80,
page = 0xffffea001c596f00,
partial = 0x0
}
[1]: ffffe8ffffa4ada0
struct kmem_cache_cpu {
freelist = 0xffff8807cccca338,
tid = 0x8c1,
page = 0xffffea001f333200,
partial = 0x0
}
[2]: ffffe8ffffa8ada0
struct kmem_cache_cpu {
freelist = 0xffff880731248498,
tid = 0xc2,
page = 0xffffea001cc49200,
partial = 0x0
}
[3]: ffffe8ffffacada0
struct kmem_cache_cpu {
freelist = 0xffff8807bc673410,
tid = 0x883,
page = 0xffffea001ef19c00,
partial = 0x0
}
...
crash> struct kmem_cache_node 0xffff8807d3fb4000
struct kmem_cache_node {
list_lock = {
{
rlock = {
raw_lock = {
val = {
counter = 0x0
}
}
}
}
},
nr_partial = 0x0,
partial = {
next = 0xffff8807d3fb4010,
prev = 0xffff8807d3fb4010
},
nr_slabs = {
counter = 0xf      <=== 0xf = 15 num_slabs
},
total_objects = {
counter = 0x267    <=== 0x267 = 615 num_objs
},
full = {
next = 0xffff8807d3fb4030,
prev = 0xffff8807d3fb4030
}
}

crash> fs_fte ffff8807c993edf0
struct fs_fte {
node = {
list = {
next = 0xffff8807c993ec68,
prev = 0xffff88078ab0ecc0
},
children = {
next = 0xffff8807d12c6d80,
prev = 0xffff8807d12c6c00
},
type = FS_TYPE_FLOW_ENTRY,
parent = 0xffff88078ab0ecb0,
root = 0xffff8807ffa29400,
lock = {
count = {
counter = 0x0
},
wait_list = {
next = 0xffff8807c993ee30,
prev = 0xffff8807c993ee30
},
wait_lock = {
raw_lock = {
val = {
counter = 0x0
}
}
},
osq = {
tail = {
counter = 0x0
}
},
owner = 0x0
},
refcount = {
refs = {
counter = 0x3
}
},
active = 0x1,
del_hw_func = 0xffffffffa0c66f50 <del_hw_fte>,
del_sw_func = 0xffffffffa0c6a530 <del_sw_fte>,
version = {
counter = 0x1
}
},
val = {0x13d02502, 0x80201, 0x13d02502, 0x301, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x2000000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
dests_size = 0x3,
index = 0x0,
action = {
action = 0xc,
has_flow_tag = 0x0,
flow_tag = 0x0,
encap_id = 0x0,
modify_id = 0x0,
esp_id = 0x0,
vlan = {
ethtype = 0x0,
vid = 0x0,
prio = 0x0
}
},
status = FS_FTE_STATUS_EXISTING,
counter = 0x0,
hash = {
next = 0x5d
}
}
crash> vtop ffff8807c993edf0
VIRTUAL           PHYSICAL
ffff8807c993edf0  7c993edf0

PGD DIRECTORY: ffffffff8200a000
PAGE DIRECTORY: 107f78b067
PUD: 107f78b0f8 => 7dbde4063
PMD: 7dbde4260 => 7d5be7063
PTE: 7d5be79f0 => 80000007c993e063
PAGE: 7c993e000

PTE         PHYSICAL   FLAGS
80000007c993e063  7c993e000  (PRESENT|RW|ACCESSED|DIRTY|NX)

PAGE        PHYSICAL      MAPPING       INDEX CNT FLAGS
ffffea001f264f80 7c993e000 dead000000000400        0  0 8000000000000000

# a=0xffff8807c993edf0; b=0x7c993edf0; printf -v c "%#x" $[a-b] ; echo $c
0xffff880000000000  <=== PAGE_OFFSET

crash> struct page.compound_head ffffea001f264f80
compound_head = 0xffffea001f264f01
crash> struct page 0xffffea001f264f00
struct page {
flags = 0x8000000000008100,
{
mapping = 0x0,
s_mem = 0x0,
compound_mapcount = {
counter = 0x0
}
},
{
index = 0x0,
freelist = 0x0
},
{
counters = 0x180290029,
active = 0x80290029,
{
inuse = 0x29,
objects = 0x29,         <=== 0x29 = 41 objperslab
frozen = 0x1
},
units = 0x80290029,
{
_mapcount = {
counter = 0x80290029
},
_refcount = {
counter = 0x1
}
}
},
{
lru = {
next = 0xdead000000000100,
prev = 0xdead000000000200
},
pgmap = 0xdead000000000100,
{
next = 0xdead000000000100,
pages = 0x200,
pobjects = 0xdead0000
},
callback_head = {
next = 0xdead000000000100,
func = 0xdead000000000200
},
{
compound_head = 0xdead000000000100,
compound_dtor = 0x0,
compound_order = 0x2
},
{
__pad = 0xdead000000000100,
pmd_huge_pte = 0xdead000000000200
}
},
{
private = 0xffff8807fe2b6100,
ptl = {
{
rlock = {
raw_lock = {
val = {
counter = 0xfe2b6100
}
}
}
}
},
slab_cache = 0xffff8807fe2b6100    <=== address of struct kmem_cache at the beginning
},
mem_cgroup = 0x0
}