The patch titled
Subject: lib: add note about process exit message for DEBUG_STACK_USAGE
has been added to the -mm mm-nonmm-unstable branch. Its filename is
lib-add-note-about-process-exit-message-for-debug_stack_usage.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/lib-add-note-about-process-exit-message-for-debug_stack_usage.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: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Subject: lib: add note about process exit message for DEBUG_STACK_USAGE
Date: Tue, 19 Dec 2023 19:28:09 +0100
DEBUG_STACK_USAGE doesn't only have an influence on the output of sysrq-T
and sysrq-P, it also enables a message at process exit. See
check_stack_usage() in kernel/exit.c where this is implemented.
Link: https://lkml.kernel.org/r/20231219182808.210284-2-u.kleine-koenig@xxxxxxxxxxxxxx
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Cc: Douglas Anderson <dianders@xxxxxxxxxxxx>
Cc: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Marco Elver <elver@xxxxxxxxxx>
Cc: "Paul E. McKenney" <paulmck@xxxxxxxxxx>
Cc: Pengutronix Kernel Team <kernel@xxxxxxxxxxxxxx>
Cc: Petr Mladek <pmladek@xxxxxxxx>
Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Stephen Boyd <sboyd@xxxxxxxxxx>
Cc: Zhaoyang Huang <zhaoyang.huang@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/Kconfig.debug | 2 ++
1 file changed, 2 insertions(+)
--- a/lib/Kconfig.debug~lib-add-note-about-process-exit-message-for-debug_stack_usage
+++ a/lib/Kconfig.debug
@@ -763,6 +763,8 @@ config DEBUG_STACK_USAGE
help
Enables the display of the minimum amount of free stack which each
task has ever had available in the sysrq-T and sysrq-P debug output.
+ Also emits a message to dmesg when a process exits if that process
+ used more stack space than previously exiting processes.
This option will slow down process creation somewhat.
_
Patches currently in -mm which might be from u.kleine-koenig@xxxxxxxxxxxxxx are
lib-add-note-about-process-exit-message-for-debug_stack_usage.patch
