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authorFrederic Weisbecker <fweisbec@gmail.com>2008-11-23 06:22:56 +0100
committerIngo Molnar <mingo@elte.hu>2008-11-23 09:17:26 +0100
commitf201ae2356c74bcae130b2177b3dca903ea98071 (patch)
treec4b1b43fbe0a4594cb86749b2e7098fe15eb86ba /arch/x86/include/asm/thread_info.h
parenta0a70c735ef714fe1b6777b571630c3d50c7b008 (diff)
tracing/function-return-tracer: store return stack into task_struct and allocate it dynamically
Impact: use deeper function tracing depth safely Some tests showed that function return tracing needed a more deeper depth of function calls. But it could be unsafe to store these return addresses to the stack. So these arrays will now be allocated dynamically into task_struct of current only when the tracer is activated. Typical scheme when tracer is activated: - allocate a return stack for each task in global list. - fork: allocate the return stack for the newly created task - exit: free return stack of current - idle init: same as fork I chose a default depth of 50. I don't have overruns anymore. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/include/asm/thread_info.h')
-rw-r--r--arch/x86/include/asm/thread_info.h29
1 files changed, 0 insertions, 29 deletions
diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h
index e90e81ef6ab..0921b4018c1 100644
--- a/arch/x86/include/asm/thread_info.h
+++ b/arch/x86/include/asm/thread_info.h
@@ -40,36 +40,8 @@ struct thread_info {
*/
__u8 supervisor_stack[0];
#endif
-
-#ifdef CONFIG_FUNCTION_RET_TRACER
- /* Index of current stored adress in ret_stack */
- int curr_ret_stack;
- /* Stack of return addresses for return function tracing */
- struct ftrace_ret_stack ret_stack[FTRACE_RET_STACK_SIZE];
- /*
- * Number of functions that haven't been traced
- * because of depth overrun.
- */
- atomic_t trace_overrun;
-#endif
};
-#ifdef CONFIG_FUNCTION_RET_TRACER
-#define INIT_THREAD_INFO(tsk) \
-{ \
- .task = &tsk, \
- .exec_domain = &default_exec_domain, \
- .flags = 0, \
- .cpu = 0, \
- .preempt_count = 1, \
- .addr_limit = KERNEL_DS, \
- .restart_block = { \
- .fn = do_no_restart_syscall, \
- }, \
- .curr_ret_stack = -1,\
- .trace_overrun = ATOMIC_INIT(0) \
-}
-#else
#define INIT_THREAD_INFO(tsk) \
{ \
.task = &tsk, \
@@ -82,7 +54,6 @@ struct thread_info {
.fn = do_no_restart_syscall, \
}, \
}
-#endif
#define init_thread_info (init_thread_union.thread_info)
#define init_stack (init_thread_union.stack)