Viewing: vm_table.py
"""
Provide access to the crash's vm table.
Copyright 2014 Cray Inc. All Rights Reserved
"""
from pykdump.API import *
import crashlib.cid
class VmInfo:
"""Make data from the crash vmtbl easily available."""
def __init__(self):
"""Extract VM table data from crash.
Initialize the table of VM information by parsing
the output of the 'help -v' command. This only extracts
selected data.
Each item extracted is made available as an instance attribute.
"""
# crash 'help -v' doesn't use prefixes on numbers, so we must
# know what number base is in use for each numeric field.
decFields = ('total_pages', 'max_mapnr', 'totalram_pages',
'totalhigh_pages', 'num_physpages',
'page_hash_table_len', 'kmem_max_c_num',
'kmem_max_limit', 'kmem_max_cpus', 'kmem_cache_count',
'kmem_cache_namelen', 'kmem_cache_len_nodes', 'PG_slab',
'paddr_prlen', 'numnodes', 'nr_zones', 'nr_free_areas',
'cpu_slab_type', 'nr_swapfiles', 'ZONE_HIGHMEM',
'node_online_map_len', 'nr_vm_stat_items',
'nr_vm_event_items')
hexFields = ('flags', 'high_memory', 'vmalloc_start',
'mem_map', 'page_hash_table', 'PG_reserved',
'PG_head_tail_mask', 'slab_data', 'last_swap_read',
'swap_info_struct', 'mem_sec', 'mem_section')
expected_key_count = len(decFields) + len(hexFields)
for line in exec_crash_command('help -v').splitlines():
# flags: 10dc52
# (NODES_ONLINE|ZONES|PERCPU_KMALLOC_V2|KMEM_CACHE_INIT|SPARSEMEM|SPARSEMEM_EX|PERCPU_KMALLOC_V2_NODES|VM_STAT|VM_INIT)
# kernel_pgd[NR_CPUS]: ffffffff8163f000 ...
# high_memory: ffff880880000000
# vmalloc_start: ffffc90000000000
# mem_map: 0
# ...
#
# Only use the first value after the field name and
# only for selected fields.
parts = line.split()
if len(parts) < 2: continue
key = parts[0].rstrip(':')
if key in decFields:
self.__dict__[key] = int(parts[1],10)
elif key in hexFields:
self.__dict__[key] = int(parts[1],16)
# If some versions of crash or the kernel don't have all the
# fields, this check code may need to be removed or modified.
if len(self.__dict__.keys()) != expected_key_count:
raise crashlib.ida.ParseError(
'Expected {:d}, but parsed {:d} entries.'.format(
expected_key_count, len(self.__dict__.keys())))
# --------------------------------------------------------------------------
# Declare a shared instance.
crashlib.cid.vmtbl = VmInfo()
