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authorSteven Rostedt <srostedt@redhat.com>2011-07-14 16:36:53 -0400
committerSteven Rostedt <rostedt@goodmis.org>2011-07-14 16:36:53 -0400
commit4a9bd3f134decd6d16ead8d288342d57aad486be (patch)
treeca9eca5fcbe93dc8a433d839221505ad8fba5296 /kernel/trace/trace_entries.h
parent259032bfe379281bf7cba512b7705bdb4ce41db5 (diff)
tracing: Have dynamic size event stack traces
Currently the stack trace per event in ftace is only 8 frames. This can be quite limiting and sometimes useless. Especially when the "ignore frames" is wrong and we also use up stack frames for the event processing itself. Change this to be dynamic by adding a percpu buffer that we can write a large stack frame into and then copy into the ring buffer. For interrupts and NMIs that come in while another event is being process, will only get to use the 8 frame stack. That should be enough as the task that it interrupted will have the full stack frame anyway. Requested-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace_entries.h')
-rw-r--r--kernel/trace/trace_entries.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/trace/trace_entries.h b/kernel/trace/trace_entries.h
index e32744c84d9..93365907f21 100644
--- a/kernel/trace/trace_entries.h
+++ b/kernel/trace/trace_entries.h
@@ -161,7 +161,8 @@ FTRACE_ENTRY(kernel_stack, stack_entry,
TRACE_STACK,
F_STRUCT(
- __array( unsigned long, caller, FTRACE_STACK_ENTRIES )
+ __field( int, size )
+ __dynamic_array(unsigned long, caller )
),
F_printk("\t=> (%08lx)\n\t=> (%08lx)\n\t=> (%08lx)\n\t=> (%08lx)\n"