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