Commit 0e1b240a authored by Kuan-Ying Lee's avatar Kuan-Ying Lee Committed by Andrew Morton
Browse files

scripts/gdb/stackdepot: add stackdepot support 

Add support for printing the backtrace of stackdepot handle.

This is the preparation patch for dumping page_owner,
slabtrace usage.

Link: https://lkml.kernel.org/r/20230808083020.22254-6-Kuan-Ying.Lee@mediatek.com


Signed-off-by: default avatarKuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Cc: Chinwen Chang <chinwen.chang@mediatek.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Qun-Wei Lin <qun-wei.lin@mediatek.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent eb985b5d

scripts/gdb/linux/constants.py.in

+1 −0
Original line number Diff line number Diff line
@@ -128,3 +128,4 @@ LX_CONFIG(CONFIG_VMAP_STACK) 
if IS_BUILTIN(CONFIG_NUMA):

    LX_VALUE(CONFIG_NODES_SHIFT)

LX_CONFIG(CONFIG_DEBUG_VIRTUAL)

LX_CONFIG(CONFIG_STACKDEPOT)

scripts/gdb/linux/stackdepot.py

0 → 100644
+55 −0
Original line number Diff line number Diff line 
# SPDX-License-Identifier: GPL-2.0

#

# Copyright (c) 2023 MediaTek Inc.

#

# Authors:

#  Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>

#



import gdb

from linux import utils, constants



if constants.LX_CONFIG_STACKDEPOT:

    stack_record_type = utils.CachedType('struct stack_record')

    DEPOT_STACK_ALIGN = 4



def stack_depot_fetch(handle):

    global DEPOT_STACK_ALIGN

    global stack_record_type



    stack_depot_disabled = gdb.parse_and_eval('stack_depot_disabled')



    if stack_depot_disabled:

        raise gdb.GdbError("stack_depot_disabled\n")



    handle_parts_t = gdb.lookup_type("union handle_parts")

    parts = handle.cast(handle_parts_t)

    offset = parts['offset'] << DEPOT_STACK_ALIGN

    pool_index_cached = gdb.parse_and_eval('pool_index')



    if parts['pool_index'] > pool_index_cached:

        gdb.write("pool index %d out of bounds (%d) for stack id 0x%08x\n" % (parts['pool_index'], pool_index_cached, handle))

        return gdb.Value(0), 0



    stack_pools = gdb.parse_and_eval('stack_pools')



    try:

        pool = stack_pools[parts['pool_index']]

        stack = (pool + gdb.Value(offset).cast(utils.get_size_t_type())).cast(stack_record_type.get_type().pointer())

        size = int(stack['size'].cast(utils.get_ulong_type()))

        return stack['entries'], size

    except Exception as e:

        gdb.write("%s\n" % e)

        return gdb.Value(0), 0



def stack_depot_print(handle):

    if not constants.LX_CONFIG_STACKDEPOT:

        raise gdb.GdbError("CONFIG_STACKDEPOT is not enabled")



    entries, nr_entries = stack_depot_fetch(handle)

    if nr_entries > 0:

        for i in range(0, nr_entries):

            try:

                gdb.execute("x /i 0x%x" % (int(entries[i])))

            except Exception as e:

                gdb.write("%s\n" % e)

scripts/gdb/vmlinux-gdb.py

+1 −0
Original line number Diff line number Diff line
@@ -45,3 +45,4 @@ else: 
    import linux.radixtree

    import linux.interrupts

    import linux.mm

    import linux.stackdepot