The support is pretty straightforward: issue print_preempt_trace() just after the call trace. Without CONFIG_PREEMPT_TRACE=y the print_preempt_trace() call turns into no-op. Signed-off-by: Anton Vorontsov <avorontsov@xxxxxxxxxxxxx> --- On Fri, Jan 30, 2009 at 12:57:01PM -0500, Steven Rostedt wrote: [...] > > > Turn on CONFIG_PREEMPT_TRACE (not TRACER) and it should show the > > > location that left preemption disabled. > > > > Thank you Steven, PREEMPT_TRACE is a great tool indeed (though on > > PowerPC it doesn't work out of the box, but easily fixable). > > Cool, I'd be interested in those fixes. Here it is. "ftrace: On PowerPC we don't need frame pointers for CALLER_ADDRs" patch (http://lkml.org/lkml/2009/1/31/141) is also needed for this to work. Thanks, arch/powerpc/kernel/process.c | 4 +++- 1 files changed, 3 insertions(+), 1 deletions(-) diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 957bded..b8642bf 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -1020,7 +1020,7 @@ void show_stack(struct task_struct *tsk, unsigned long *stack) printk("Call Trace:\n"); do { if (!validate_sp(sp, tsk, STACK_FRAME_OVERHEAD)) - return; + goto out; stack = (unsigned long *) sp; newsp = stack[0]; @@ -1049,6 +1049,8 @@ void show_stack(struct task_struct *tsk, unsigned long *stack) sp = newsp; } while (count++ < kstack_depth_to_print); +out: + print_preempt_trace(tsk); } void dump_stack(void) -- 1.5.6.5 -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
