The patch titled
Subject: scripts/gdb/stackdepot: add stackdepot support
has been added to the -mm mm-nonmm-unstable branch. Its filename is
scripts-gdb-stackdepot-add-stackdepot-support.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/scripts-gdb-stackdepot-add-stackdepot-support.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Kuan-Ying Lee <Kuan-Ying.Lee@xxxxxxxxxxxx>
Subject: scripts/gdb/stackdepot: add stackdepot support
Date: Tue, 8 Aug 2023 16:30:15 +0800
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@xxxxxxxxxxxx
Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee@xxxxxxxxxxxx>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
Cc: Chinwen Chang <chinwen.chang@xxxxxxxxxxxx>
Cc: Matthias Brugger <matthias.bgg@xxxxxxxxx>
Cc: Qun-Wei Lin <qun-wei.lin@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
scripts/gdb/linux/constants.py.in | 1
scripts/gdb/linux/stackdepot.py | 55 ++++++++++++++++++++++++++++
scripts/gdb/vmlinux-gdb.py | 1
3 files changed, 57 insertions(+)
--- a/scripts/gdb/linux/constants.py.in~scripts-gdb-stackdepot-add-stackdepot-support
+++ a/scripts/gdb/linux/constants.py.in
@@ -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)
--- /dev/null
+++ a/scripts/gdb/linux/stackdepot.py
@@ -0,0 +1,55 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Copyright (c) 2023 MediaTek Inc.
+#
+# Authors:
+# Kuan-Ying Lee <Kuan-Ying.Lee@xxxxxxxxxxxx>
+#
+
+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)
--- a/scripts/gdb/vmlinux-gdb.py~scripts-gdb-stackdepot-add-stackdepot-support
+++ a/scripts/gdb/vmlinux-gdb.py
@@ -45,3 +45,4 @@ else:
import linux.radixtree
import linux.interrupts
import linux.mm
+ import linux.stackdepot
_
Patches currently in -mm which might be from Kuan-Ying.Lee@xxxxxxxxxxxx are
scripts-gdb-fix-lx-lsmod-show-the-wrong-size.patch
scripts-gdb-symbols-add-specific-ko-module-load-command.patch
scripts-gdb-modules-add-get-module-text-support.patch
scripts-gdb-utils-add-common-type-usage.patch
scripts-gdb-aarch64-add-aarch64-page-operation-helper-commands-and-configs.patch
scripts-gdb-stackdepot-add-stackdepot-support.patch
scripts-gdb-page_owner-add-page-owner-support.patch
scripts-gdb-slab-add-slab-support.patch
scripts-gdb-vmalloc-add-vmallocinfo-support.patch
