Viewing: kernel_table.py
"""
Provide access to kernel_table data.
Copyright 2014 Cray Inc. All Rights Reserved
"""
from pykdump.API import *
import crashlib.cid
class KernelInfo:
"""Provide access to the crash kernel_table.
The data is collected by parsing the output of the 'help -k' command.
"""
def __init__(self):
"""Extract kernel data from crash.
Initialize the table of kernel information by parsing the output
of the 'help -k' command. This only extracts selected data.
Each item extracted is made available as an instance attribute.
"""
# crash 'help -k' doesn't use prefixes on numbers, so we must
# know what number base is in use for each numeric field.
decFields = ('cpus', 'NR_CPUS', 'kernel_NR_CPUS')
hexFields = ('flags', 'stext', 'etext', 'stext_init', 'etext_init',
'init_begin', 'init_end', 'end', 'module_list', 'kernel_module')
expected_key_count = len(decFields) + len(hexFields)
for line in exec_crash_command('help -k').splitlines():
# crash> help -k
# flags: b02600
# (PER_CPU_OFF|SMP|KMOD_V2|KALLSYMS_V2|NO_DWARF_UNWIND|DWARF_UNWIND_MEMORY|DWARF_UNWIND_MODULES)
# stext: ffffffff810001f0
# etext: ffffffff813915b5
# stext_init: ffffffff8170b000
# etext_init: ffffffff81740b65
# init_begin: ffffffff816f9000
# init_end: ffffffff81796000
# end: ffffffff818cf000
# cpus: 48
# cpus_override: (null)
# NR_CPUS: 4096 (compiled-in to this version of crash)
# kernel_NR_CPUS: 48
# ikconfig_flags: 1 (IKCONFIG_AVAIL)
# ikconfig_ents: 0
# display_bh: 0
# highest_irq: (unused/undetermined)
# module_list: ffffffffa05c96e0
# kernel_module: ffffffff81684630
# mods_installed: 40
# ...
#
# 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.cid.ParseError(
'Expected {:d}, but parsed {:d} entries.'.format(
expected_key_count, len(self.__dict__.keys())))
# --------------------------------------------------------------------------
# Create a shared instances.
crashlib.cid.krntbl = KernelInfo()
