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#!/usr/bin/env drgn
# Copyright (c) Meta Platforms, Inc. and affiliates.
# SPDX-License-Identifier: LGPL-2.1-or-later
"""An implementation of lsmod(8) using drgn"""
from drgn.helpers.linux.list import list_for_each_entry
def module_total_size(mod):
# Since Linux kernel commit ac3b43283923 ("module: replace module_layout
# with module_memory") (in v6.4), the memory sizes are in the struct
# module::mem array. Before that, they are in struct module::init_layout
# and struct module::core_layout.
try:
num_types = mod.prog_["MOD_MEM_NUM_TYPES"]
except KeyError:
return (mod.init_layout.size + mod.core_layout.size).value_()
else:
return sum(
mod.mem[type].size.value_()
for type in range(num_types)
)
print("Module Size Used by")
config_module_unload = prog.type("struct module").has_member("refcnt")
for mod in list_for_each_entry("struct module", prog["modules"].address_of_(), "list"):
name = mod.name.string_().decode()
if config_module_unload:
refcnt = mod.refcnt.counter.value_() - 1
used_by = [
use.source.name.string_().decode()
for use in list_for_each_entry(
"struct module_use", mod.source_list.address_of_(), "source_list"
)
]
else:
refcnt = "-"
used_by = []
used = ",".join(used_by)
if used:
used = " " + used
print(f"{name:19} {module_total_size(mod):>8} {refcnt}{used}")
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