From: David Miller <davem@xxxxxxxxxxxxx>
Date: Fri, 28 Nov 2008 01:00:25 -0800 (PST)
> From: Alexey Dobriyan <adobriyan@xxxxxxxxx>
> Date: Fri, 28 Nov 2008 11:05:55 +0300
>
> > David, can you implement save_stack_trace_tsk() for sparc64? I have
> > no idea how to do it or is it doable at all.
>
> Sure thing Alexey.
I just pushed the following patch into sparc-next-2.6, so it
should show up in the next tree that Stephen builds:
sparc64: Add save_stack_trace_tsk().
And this allows us to indicate HAVE_LATENCYTOP_SUPPORT.
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
---
arch/sparc/Kconfig | 4 ++++
arch/sparc64/kernel/stacktrace.c | 32 +++++++++++++++++++++++---------
2 files changed, 27 insertions(+), 9 deletions(-)
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 10945c3..e162535 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -72,6 +72,10 @@ config LOCKDEP_SUPPORT
bool
default y if SPARC64
+config HAVE_LATENCYTOP_SUPPORT
+ bool
+ default y if SPARC64
+
config AUDIT_ARCH
bool
default y if SPARC64
diff --git a/arch/sparc64/kernel/stacktrace.c b/arch/sparc64/kernel/stacktrace.c
index 4e21d4a..acb12f6 100644
--- a/arch/sparc64/kernel/stacktrace.c
+++ b/arch/sparc64/kernel/stacktrace.c
@@ -7,17 +7,18 @@
#include "kstack.h"
-void save_stack_trace(struct stack_trace *trace)
+static void __save_stack_trace(struct thread_info *tp,
+ struct stack_trace *trace,
+ bool skip_sched)
{
- struct thread_info *tp = task_thread_info(current);
unsigned long ksp, fp;
- stack_trace_flush();
-
- __asm__ __volatile__(
- "mov %%fp, %0"
- : "=r" (ksp)
- );
+ if (tp == current_thread_info()) {
+ stack_trace_flush();
+ __asm__ __volatile__("mov %%fp, %0" : "=r" (ksp));
+ } else {
+ ksp = tp->ksp;
+ }
fp = ksp + STACK_BIAS;
do {
@@ -43,8 +44,21 @@ void save_stack_trace(struct stack_trace *trace)
if (trace->skip > 0)
trace->skip--;
- else
+ else if (!skip_sched || !in_sched_functions(pc))
trace->entries[trace->nr_entries++] = pc;
} while (trace->nr_entries < trace->max_entries);
}
+
+void save_stack_trace(struct stack_trace *trace)
+{
+ __save_stack_trace(current_thread_info(), trace, false);
+}
EXPORT_SYMBOL_GPL(save_stack_trace);
+
+void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
+{
+ struct thread_info *tp = task_thread_info(tsk);
+
+ __save_stack_trace(tp, trace, true);
+}
+EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
--
1.5.6.5
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