227 lines
6.5 KiB
Python
227 lines
6.5 KiB
Python
#!/usr/bin/env drgn
|
|
#
|
|
# Copyright (C) 2020 Roman Gushchin <guro@fb.com>
|
|
# Copyright (C) 2020 Facebook
|
|
|
|
from os import stat
|
|
import argparse
|
|
import sys
|
|
|
|
from drgn.helpers.linux import list_for_each_entry, list_empty
|
|
from drgn.helpers.linux import for_each_page
|
|
from drgn.helpers.linux.cpumask import for_each_online_cpu
|
|
from drgn.helpers.linux.percpu import per_cpu_ptr
|
|
from drgn import container_of, FaultError, Object
|
|
|
|
|
|
DESC = """
|
|
This is a drgn script to provide slab statistics for memory cgroups.
|
|
It supports cgroup v2 and v1 and can emulate memory.kmem.slabinfo
|
|
interface of cgroup v1.
|
|
For drgn, visit https://github.com/osandov/drgn.
|
|
"""
|
|
|
|
|
|
MEMCGS = {}
|
|
|
|
OO_SHIFT = 16
|
|
OO_MASK = ((1 << OO_SHIFT) - 1)
|
|
|
|
|
|
def err(s):
|
|
print('slabinfo.py: error: %s' % s, file=sys.stderr, flush=True)
|
|
sys.exit(1)
|
|
|
|
|
|
def find_memcg_ids(css=prog['root_mem_cgroup'].css, prefix=''):
|
|
if not list_empty(css.children.address_of_()):
|
|
for css in list_for_each_entry('struct cgroup_subsys_state',
|
|
css.children.address_of_(),
|
|
'sibling'):
|
|
name = prefix + '/' + css.cgroup.kn.name.string_().decode('utf-8')
|
|
memcg = container_of(css, 'struct mem_cgroup', 'css')
|
|
MEMCGS[css.cgroup.kn.id.value_()] = memcg
|
|
find_memcg_ids(css, name)
|
|
|
|
|
|
def is_root_cache(s):
|
|
try:
|
|
return False if s.memcg_params.root_cache else True
|
|
except AttributeError:
|
|
return True
|
|
|
|
|
|
def cache_name(s):
|
|
if is_root_cache(s):
|
|
return s.name.string_().decode('utf-8')
|
|
else:
|
|
return s.memcg_params.root_cache.name.string_().decode('utf-8')
|
|
|
|
|
|
# SLUB
|
|
|
|
def oo_order(s):
|
|
return s.oo.x >> OO_SHIFT
|
|
|
|
|
|
def oo_objects(s):
|
|
return s.oo.x & OO_MASK
|
|
|
|
|
|
def count_partial(n, fn):
|
|
nr_pages = 0
|
|
for page in list_for_each_entry('struct page', n.partial.address_of_(),
|
|
'lru'):
|
|
nr_pages += fn(page)
|
|
return nr_pages
|
|
|
|
|
|
def count_free(page):
|
|
return page.objects - page.inuse
|
|
|
|
|
|
def slub_get_slabinfo(s, cfg):
|
|
nr_slabs = 0
|
|
nr_objs = 0
|
|
nr_free = 0
|
|
|
|
for node in range(cfg['nr_nodes']):
|
|
n = s.node[node]
|
|
nr_slabs += n.nr_slabs.counter.value_()
|
|
nr_objs += n.total_objects.counter.value_()
|
|
nr_free += count_partial(n, count_free)
|
|
|
|
return {'active_objs': nr_objs - nr_free,
|
|
'num_objs': nr_objs,
|
|
'active_slabs': nr_slabs,
|
|
'num_slabs': nr_slabs,
|
|
'objects_per_slab': oo_objects(s),
|
|
'cache_order': oo_order(s),
|
|
'limit': 0,
|
|
'batchcount': 0,
|
|
'shared': 0,
|
|
'shared_avail': 0}
|
|
|
|
|
|
def cache_show(s, cfg, objs):
|
|
if cfg['allocator'] == 'SLUB':
|
|
sinfo = slub_get_slabinfo(s, cfg)
|
|
else:
|
|
err('SLAB isn\'t supported yet')
|
|
|
|
if cfg['shared_slab_pages']:
|
|
sinfo['active_objs'] = objs
|
|
sinfo['num_objs'] = objs
|
|
|
|
print('%-17s %6lu %6lu %6u %4u %4d'
|
|
' : tunables %4u %4u %4u'
|
|
' : slabdata %6lu %6lu %6lu' % (
|
|
cache_name(s), sinfo['active_objs'], sinfo['num_objs'],
|
|
s.size, sinfo['objects_per_slab'], 1 << sinfo['cache_order'],
|
|
sinfo['limit'], sinfo['batchcount'], sinfo['shared'],
|
|
sinfo['active_slabs'], sinfo['num_slabs'],
|
|
sinfo['shared_avail']))
|
|
|
|
|
|
def detect_kernel_config():
|
|
cfg = {}
|
|
|
|
cfg['nr_nodes'] = prog['nr_online_nodes'].value_()
|
|
|
|
if prog.type('struct kmem_cache').members[1].name == 'flags':
|
|
cfg['allocator'] = 'SLUB'
|
|
elif prog.type('struct kmem_cache').members[1].name == 'batchcount':
|
|
cfg['allocator'] = 'SLAB'
|
|
else:
|
|
err('Can\'t determine the slab allocator')
|
|
|
|
cfg['shared_slab_pages'] = False
|
|
try:
|
|
if prog.type('struct obj_cgroup'):
|
|
cfg['shared_slab_pages'] = True
|
|
except:
|
|
pass
|
|
|
|
return cfg
|
|
|
|
|
|
def for_each_slab_page(prog):
|
|
PGSlab = 1 << prog.constant('PG_slab')
|
|
PGHead = 1 << prog.constant('PG_head')
|
|
|
|
for page in for_each_page(prog):
|
|
try:
|
|
if page.flags.value_() & PGSlab:
|
|
yield page
|
|
except FaultError:
|
|
pass
|
|
|
|
|
|
def main():
|
|
parser = argparse.ArgumentParser(description=DESC,
|
|
formatter_class=
|
|
argparse.RawTextHelpFormatter)
|
|
parser.add_argument('cgroup', metavar='CGROUP',
|
|
help='Target memory cgroup')
|
|
args = parser.parse_args()
|
|
|
|
try:
|
|
cgroup_id = stat(args.cgroup).st_ino
|
|
find_memcg_ids()
|
|
memcg = MEMCGS[cgroup_id]
|
|
except KeyError:
|
|
err('Can\'t find the memory cgroup')
|
|
|
|
cfg = detect_kernel_config()
|
|
|
|
print('# name <active_objs> <num_objs> <objsize> <objperslab> <pagesperslab>'
|
|
' : tunables <limit> <batchcount> <sharedfactor>'
|
|
' : slabdata <active_slabs> <num_slabs> <sharedavail>')
|
|
|
|
if cfg['shared_slab_pages']:
|
|
obj_cgroups = set()
|
|
stats = {}
|
|
caches = {}
|
|
|
|
# find memcg pointers belonging to the specified cgroup
|
|
obj_cgroups.add(memcg.objcg.value_())
|
|
for ptr in list_for_each_entry('struct obj_cgroup',
|
|
memcg.objcg_list.address_of_(),
|
|
'list'):
|
|
obj_cgroups.add(ptr.value_())
|
|
|
|
# look over all slab pages, belonging to non-root memcgs
|
|
# and look for objects belonging to the given memory cgroup
|
|
for page in for_each_slab_page(prog):
|
|
objcg_vec_raw = page.memcg_data.value_()
|
|
if objcg_vec_raw == 0:
|
|
continue
|
|
cache = page.slab_cache
|
|
if not cache:
|
|
continue
|
|
addr = cache.value_()
|
|
caches[addr] = cache
|
|
# clear the lowest bit to get the true obj_cgroups
|
|
objcg_vec = Object(prog, 'struct obj_cgroup **',
|
|
value=objcg_vec_raw & ~1)
|
|
|
|
if addr not in stats:
|
|
stats[addr] = 0
|
|
|
|
for i in range(oo_objects(cache)):
|
|
if objcg_vec[i].value_() in obj_cgroups:
|
|
stats[addr] += 1
|
|
|
|
for addr in caches:
|
|
if stats[addr] > 0:
|
|
cache_show(caches[addr], cfg, stats[addr])
|
|
|
|
else:
|
|
for s in list_for_each_entry('struct kmem_cache',
|
|
memcg.kmem_caches.address_of_(),
|
|
'memcg_params.kmem_caches_node'):
|
|
cache_show(s, cfg, None)
|
|
|
|
|
|
main()
|