Commit 852622bf authored by Kuan-Ying Lee's avatar Kuan-Ying Lee Committed by Andrew Morton
Browse files

scripts/gdb/vmalloc: add vmallocinfo support 

This GDB script shows the vmallocinfo for user to
analyze the vmalloc memory usage.

Example output:
0xffff800008000000-0xffff800008009000      36864 <start_kernel+372> pages=8 vmalloc
0xffff800008009000-0xffff80000800b000       8192 <gicv2m_init_one+400> phys=0x8020000 ioremap
0xffff80000800b000-0xffff80000800d000       8192 <bpf_prog_alloc_no_stats+72> pages=1 vmalloc
0xffff80000800d000-0xffff80000800f000       8192 <bpf_jit_alloc_exec+16> pages=1 vmalloc
0xffff800008010000-0xffff80000ad30000   47316992 <paging_init+452> phys=0x40210000 vmap
0xffff80000ad30000-0xffff80000c1c0000   21561344 <paging_init+556> phys=0x42f30000 vmap
0xffff80000c1c0000-0xffff80000c370000    1769472 <paging_init+592> phys=0x443c0000 vmap
0xffff80000c370000-0xffff80000de90000   28442624 <paging_init+692> phys=0x44570000 vmap
0xffff80000de90000-0xffff80000f4c1000   23269376 <paging_init+788> phys=0x46090000 vmap
0xffff80000f4c1000-0xffff80000f4c3000       8192 <gen_pool_add_owner+112> pages=1 vmalloc
0xffff80000f4c3000-0xffff80000f4c5000       8192 <gen_pool_add_owner+112> pages=1 vmalloc
0xffff80000f4c5000-0xffff80000f4c7000       8192 <gen_pool_add_owner+112> pages=1 vmalloc

Link: https://lkml.kernel.org/r/20230808083020.22254-9-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 79939c4a

scripts/gdb/linux/constants.py.in

+8 −0
Original line number Diff line number Diff line
@@ -22,6 +22,7 @@ 
#include <linux/radix-tree.h>

#include <linux/slab.h>

#include <linux/threads.h>

#include <linux/vmalloc.h>



/* We need to stringify expanded macros so that they can be parsed */
@@ -91,6 +92,13 @@ LX_GDBPARSED(RADIX_TREE_MAP_SIZE) 
LX_GDBPARSED(RADIX_TREE_MAP_SHIFT)

LX_GDBPARSED(RADIX_TREE_MAP_MASK)



/* linux/vmalloc.h */

LX_VALUE(VM_IOREMAP)

LX_VALUE(VM_ALLOC)

LX_VALUE(VM_MAP)

LX_VALUE(VM_USERMAP)

LX_VALUE(VM_DMA_COHERENT)



/* linux/page_ext.h */

if IS_BUILTIN(CONFIG_PAGE_OWNER):

    LX_GDBPARSED(PAGE_EXT_OWNER)

scripts/gdb/linux/vmalloc.py

0 → 100644
+56 −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

import re

from linux import lists, utils, stackdepot, constants, mm



vmap_area_type = utils.CachedType('struct vmap_area')

vmap_area_ptr_type = vmap_area_type.get_type().pointer()



def is_vmalloc_addr(x):

    pg_ops = mm.page_ops().ops

    addr = pg_ops.kasan_reset_tag(x)

    return addr >= pg_ops.VMALLOC_START and addr < pg_ops.VMALLOC_END



class LxVmallocInfo(gdb.Command):

    """Show vmallocinfo"""



    def __init__(self):

        super(LxVmallocInfo, self).__init__("lx-vmallocinfo", gdb.COMMAND_DATA)



    def invoke(self, arg, from_tty):

        vmap_area_list = gdb.parse_and_eval('vmap_area_list')

        for vmap_area in lists.list_for_each_entry(vmap_area_list, vmap_area_ptr_type, "list"):

            if not vmap_area['vm']:

                gdb.write("0x%x-0x%x %10d vm_map_ram\n" % (vmap_area['va_start'], vmap_area['va_end'],

                    vmap_area['va_end'] - vmap_area['va_start']))

                continue

            v = vmap_area['vm']

            gdb.write("0x%x-0x%x %10d" % (v['addr'], v['addr'] + v['size'], v['size']))

            if v['caller']:

                gdb.write(" %s" % str(v['caller']).split(' ')[-1])

            if v['nr_pages']:

                gdb.write(" pages=%d" % v['nr_pages'])

            if v['phys_addr']:

                gdb.write(" phys=0x%x" % v['phys_addr'])

            if v['flags'] & constants.LX_VM_IOREMAP:

                gdb.write(" ioremap")

            if v['flags'] & constants.LX_VM_ALLOC:

                gdb.write(" vmalloc")

            if v['flags'] & constants.LX_VM_MAP:

                gdb.write(" vmap")

            if v['flags'] & constants.LX_VM_USERMAP:

                gdb.write(" user")

            if v['flags'] & constants.LX_VM_DMA_COHERENT:

                gdb.write(" dma-coherent")

            if is_vmalloc_addr(v['pages']):

                gdb.write(" vpages")

            gdb.write("\n")



LxVmallocInfo()

scripts/gdb/vmlinux-gdb.py

+1 −0
Original line number Diff line number Diff line
@@ -48,3 +48,4 @@ else: 
    import linux.stackdepot

    import linux.page_owner

    import linux.slab

    import linux.vmalloc