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lib: add note about process exit message for DEBUG_STACK_USAGE 

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@pengutronix.de
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Cc: Douglas Anderson <dianders@chromium.org>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Kees Cook <keescook@chromium.org>
Cc: Marco Elver <elver@google.com>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: Zhaoyang Huang <zhaoyang.huang@unisoc.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Uwe Kleine-König 2023-12-19 19:28:09 +01:00 committed by Andrew Morton
parent d089622b32
commit bc09d1dea8
1 changed files with 2 additions and 0 deletions
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lib/Kconfig.debug
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@ -763,6 +763,8 @@ config DEBUG_STACK_USAGE
help help
Enables the display of the minimum amount of free stack which each 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. 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. This option will slow down process creation somewhat.