From: Helge Deller <deller@gmx.de>
To: linux-parisc@vger.kernel.org,
James Bottomley <James.Bottomley@HansenPartnership.com>,
John David Anglin <dave.anglin@bell.net>,
James Hogan <james.hogan@imgtec.com>,
linux-metag@vger.kernel.org, linux-ia64@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH] parisc,metag: Implement CONFIG_DEBUG_STACK_USAGE option
Date: Sat, 19 Mar 2016 17:54:10 +0100 [thread overview]
Message-ID: <20160319165410.GA31630@p100.box> (raw)
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 <deller@gmx.de>
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.
next reply other threads:[~2016-03-19 16:54 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-19 16:54 Helge Deller [this message]
2016-04-29 22:04 ` [PATCH] parisc,metag: Implement CONFIG_DEBUG_STACK_USAGE option James Hogan
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