From 01f4b8b8b8db09b88be7df7e51192e4e678b69d3 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Fri, 11 Jul 2008 00:08:18 +1000 Subject: powerpc: support for latencytop Implement save_stack_trace_tsk on powerpc, so that we can run with latencytop. Signed-off-by: Arnd Bergmann Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/Kconfig | 3 +++ arch/powerpc/kernel/stacktrace.c | 37 +++++++++++++++++++++++++++---------- 2 files changed, 30 insertions(+), 10 deletions(-) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index aaf99892d1b3..5e2185432ad3 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -53,6 +53,9 @@ config STACKTRACE_SUPPORT bool default y +config HAVE_LATENCYTOP_SUPPORT + def_bool y + config TRACE_IRQFLAGS_SUPPORT bool depends on PPC64 diff --git a/arch/powerpc/kernel/stacktrace.c b/arch/powerpc/kernel/stacktrace.c index 962944038430..6a4fb003fa54 100644 --- a/arch/powerpc/kernel/stacktrace.c +++ b/arch/powerpc/kernel/stacktrace.c @@ -10,33 +10,34 @@ * 2 of the License, or (at your option) any later version. */ +#include #include #include #include +#include /* * Save stack-backtrace addresses into a stack_trace buffer. */ -void save_stack_trace(struct stack_trace *trace) +static void save_context_stack(struct stack_trace *trace, unsigned long sp, + struct task_struct *tsk, int savesched) { - unsigned long sp; - - asm("mr %0,1" : "=r" (sp)); - for (;;) { unsigned long *stack = (unsigned long *) sp; unsigned long newsp, ip; - if (!validate_sp(sp, current, STACK_FRAME_OVERHEAD)) + if (!validate_sp(sp, tsk, STACK_FRAME_OVERHEAD)) return; newsp = stack[0]; ip = stack[STACK_FRAME_LR_SAVE]; - if (!trace->skip) - trace->entries[trace->nr_entries++] = ip; - else - trace->skip--; + if (savesched || !in_sched_functions(ip)) { + if (!trace->skip) + trace->entries[trace->nr_entries++] = ip; + else + trace->skip--; + } if (trace->nr_entries >= trace->max_entries) return; @@ -44,3 +45,19 @@ void save_stack_trace(struct stack_trace *trace) sp = newsp; } } + +void save_stack_trace(struct stack_trace *trace) +{ + unsigned long sp; + + asm("mr %0,1" : "=r" (sp)); + + save_context_stack(trace, sp, current, 1); +} +EXPORT_SYMBOL_GPL(save_stack_trace); + +void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) +{ + save_context_stack(trace, tsk->thread.regs->gpr[1], tsk, 0); +} +EXPORT_SYMBOL_GPL(save_stack_trace_tsk); -- cgit v1.2.3