diff options
| author | Arnd Bergmann <arnd@arndb.de> | 2008-07-10 16:08:18 +0200 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2008-07-15 04:29:15 +0200 |
| commit | 01f4b8b8b8db09b88be7df7e51192e4e678b69d3 (patch) | |
| tree | b5ac9c9729182fc02ab5165c493d04ae3f67dcf9 /arch | |
| parent | powerpc: Remove unnecessary condition when sanity-checking WIMG bits (diff) | |
| download | linux-01f4b8b8b8db09b88be7df7e51192e4e678b69d3.tar.xz linux-01f4b8b8b8db09b88be7df7e51192e4e678b69d3.zip | |
powerpc: support for latencytop
Implement save_stack_trace_tsk on powerpc, so that we can run with
latencytop.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/Kconfig | 3 | ||||
| -rw-r--r-- | 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 <linux/module.h> #include <linux/sched.h> #include <linux/stacktrace.h> #include <asm/ptrace.h> +#include <asm/processor.h> /* * 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); |