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authorSteven Rostedt (Red Hat) <rostedt@goodmis.org>2013-03-13 21:25:35 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-05-07 19:57:23 -0700
commit53318264d21af2445edd1eb47b4189717d53f288 (patch)
treebe97a1acdd5edceef24506dcae2126ca540c0521
parentf42aa66c19796fd453f434be29a039707aec435f (diff)
tracing: Fix stack tracer with fentry use
commit d4ecbfc49b4b1d4b597fb5ba9e4fa25d62f105c5 upstream. When gcc 4.6 on x86 is used, the function tracer will use the new option -mfentry which does a call to "fentry" at every function instead of "mcount". The significance of this is that fentry is called as the first operation of the function instead of the mcount usage of being called after the stack. This causes the stack tracer to show some bogus results for the size of the last function traced, as well as showing "ftrace_call" instead of the function. This is due to the stack frame not being set up by the function that is about to be traced. # cat stack_trace Depth Size Location (48 entries) ----- ---- -------- 0) 4824 216 ftrace_call+0x5/0x2f 1) 4608 112 ____cache_alloc+0xb7/0x22d 2) 4496 80 kmem_cache_alloc+0x63/0x12f The 216 size for ftrace_call includes both the ftrace_call stack (which includes the saving of registers it does), as well as the stack size of the parent. To fix this, if CC_USING_FENTRY is defined, then the stack_tracer will reserve the first item in stack_dump_trace[] array when calling save_stack_trace(), and it will fill it in with the parent ip. Then the code will look for the parent pointer on the stack and give the real size of the parent's stack pointer: # cat stack_trace Depth Size Location (14 entries) ----- ---- -------- 0) 2640 48 update_group_power+0x26/0x187 1) 2592 224 update_sd_lb_stats+0x2a5/0x4ac 2) 2368 160 find_busiest_group+0x31/0x1f1 3) 2208 256 load_balance+0xd9/0x662 I'm Cc'ing stable, although it's not urgent, as it only shows bogus size for item #0, the rest of the trace is legit. It should still be corrected in previous stable releases. Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--kernel/trace/trace_stack.c33
1 files changed, 29 insertions, 4 deletions
diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index d21f8440e032..f8bf3df8e4bb 100644
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -17,13 +17,27 @@
#define STACK_TRACE_ENTRIES 500
+/*
+ * If fentry is used, then the function being traced will
+ * jump to fentry directly before it sets up its stack frame.
+ * We need to ignore that one and record the parent. Since
+ * the stack frame for the traced function wasn't set up yet,
+ * the stack_trace wont see the parent. That needs to be added
+ * manually to stack_dump_trace[] as the first element.
+ */
+#ifdef CC_USING_FENTRY
+# define add_func 1
+#else
+# define add_func 0
+#endif
+
static unsigned long stack_dump_trace[STACK_TRACE_ENTRIES+1] =
{ [0 ... (STACK_TRACE_ENTRIES)] = ULONG_MAX };
static unsigned stack_dump_index[STACK_TRACE_ENTRIES];
static struct stack_trace max_stack_trace = {
- .max_entries = STACK_TRACE_ENTRIES,
- .entries = stack_dump_trace,
+ .max_entries = STACK_TRACE_ENTRIES - add_func,
+ .entries = &stack_dump_trace[add_func],
};
static unsigned long max_stack_size;
@@ -38,7 +52,7 @@ int stack_tracer_enabled;
static int last_stack_tracer_enabled;
static inline void
-check_stack(unsigned long *stack)
+check_stack(unsigned long ip, unsigned long *stack)
{
unsigned long this_size, flags;
unsigned long *p, *top, *start;
@@ -69,6 +83,17 @@ check_stack(unsigned long *stack)
save_stack_trace(&max_stack_trace);
/*
+ * When fentry is used, the traced function does not get
+ * its stack frame set up, and we lose the parent.
+ * Add that one in manally. We set up save_stack_trace()
+ * to not touch the first element in this case.
+ */
+ if (add_func) {
+ stack_dump_trace[0] = ip;
+ max_stack_trace.nr_entries++;
+ }
+
+ /*
* Now find where in the stack these are.
*/
i = 0;
@@ -124,7 +149,7 @@ stack_trace_call(unsigned long ip, unsigned long parent_ip)
if (per_cpu(trace_active, cpu)++ != 0)
goto out;
- check_stack(&stack);
+ check_stack(parent_ip, &stack);
out:
per_cpu(trace_active, cpu)--;