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[PATCH] lockdep: stacktrace subsystem, core

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Framework to generate and save stacktraces quickly, without printing anything
to the console.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ingo Molnar 2006-07-03 00:24:38 -07:00 committed by Linus Torvalds
parent f0a5c315eb
commit 8637c09901
4 changed files with 50 additions and 1 deletions
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20
include/linux/stacktrace.h Normal file
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@ -0,0 +1,20 @@
#ifndef __LINUX_STACKTRACE_H
#define __LINUX_STACKTRACE_H
#ifdef CONFIG_STACKTRACE
struct stack_trace {
unsigned int nr_entries, max_entries;
unsigned long *entries;
};
extern void save_stack_trace(struct stack_trace *trace,
struct task_struct *task, int all_contexts,
unsigned int skip);
extern void print_stack_trace(struct stack_trace *trace, int spaces);
#else
# define save_stack_trace(trace, task, all, skip) do { } while (0)
# define print_stack_trace(trace) do { } while (0)
#endif
#endif

1
kernel/Makefile
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@ -10,6 +10,7 @@ obj-y = sched.o fork.o exec_domain.o panic.o printk.o profile.o \
kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o mutex.o \
hrtimer.o
obj-$(CONFIG_STACKTRACE) += stacktrace.o
obj-y += time/
obj-$(CONFIG_DEBUG_MUTEXES) += mutex-debug.o
obj-$(CONFIG_FUTEX) += futex.o

24
kernel/stacktrace.c Normal file
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@ -0,0 +1,24 @@
/*
* kernel/stacktrace.c
*
* Stack trace management functions
*
* Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
*/
#include <linux/sched.h>
#include <linux/kallsyms.h>
#include <linux/stacktrace.h>
void print_stack_trace(struct stack_trace *trace, int spaces)
{
int i, j;
for (i = 0; i < trace->nr_entries; i++) {
unsigned long ip = trace->entries[i];
for (j = 0; j < spaces + 1; j++)
printk(" ");
print_ip_sym(ip);
}
}

6
lib/Kconfig.debug
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@ -107,7 +107,7 @@ config DEBUG_SLAB_LEAK
config DEBUG_PREEMPT
bool "Debug preemptible kernel"
depends on DEBUG_KERNEL && PREEMPT
depends on DEBUG_KERNEL && PREEMPT && TRACE_IRQFLAGS_SUPPORT
default y
help
If you say Y here then the kernel will use a debug variant of the
@ -149,6 +149,10 @@ config DEBUG_SPINLOCK_SLEEP
If you say Y here, various routines which may sleep will become very
noisy if they are called with a spinlock held.
config STACKTRACE
bool
depends on STACKTRACE_SUPPORT
config DEBUG_KOBJECT
bool "kobject debugging"
depends on DEBUG_KERNEL