From mboxrd@z Thu Jan 1 00:00:00 1970 From: Helge Deller Subject: [PATCH] parisc,metag: Implement CONFIG_DEBUG_STACK_USAGE option Date: Sat, 19 Mar 2016 17:54:10 +0100 Message-ID: <20160319165410.GA31630@p100.box> Mime-Version: 1.0 Return-path: Content-Disposition: inline Sender: linux-parisc-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-parisc@vger.kernel.org, James Bottomley , John David Anglin , James Hogan , linux-metag@vger.kernel.org, linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org On parisc and metag the stack grows upwards, so for those we need to scan the stack downwards in order to calculate how much stack a process has used. Tested on a 64bit parisc kernel. Signed-off-by: Helge Deller diff --git a/include/linux/sched.h b/include/linux/sched.h index 084ed9f..71591f3 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -2859,10 +2859,18 @@ static inline unsigned long stack_not_used(struct task_struct *p) unsigned long *n = end_of_stack(p); do { /* Skip over canary */ +# ifdef CONFIG_STACK_GROWSUP + n--; +# else n++; +# endif } while (!*n); +# ifdef CONFIG_STACK_GROWSUP + return (unsigned long)end_of_stack(p) - (unsigned long)n; +# else return (unsigned long)n - (unsigned long)end_of_stack(p); +# endif } #endif extern void set_task_stack_end_magic(struct task_struct *tsk); diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index f28f7fa..901f96c 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -546,7 +546,7 @@ config DEBUG_KMEMLEAK_DEFAULT_OFF config DEBUG_STACK_USAGE bool "Stack utilization instrumentation" - depends on DEBUG_KERNEL && !IA64 && !PARISC && !METAG + depends on DEBUG_KERNEL && !IA64 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.