Commit-ID: d2d45c7a03a2b1a14159cbb665e9dd60991a7d4f
Gitweb: http://git.kernel.org/tip/d2d45c7a03a2b1a14159cbb665e9dd60991a7d4f
Author: Steven Rostedt <srostedt@xxxxxxxxxx>
AuthorDate: Mon, 19 Dec 2011 14:44:09 -0500
Committer: Steven Rostedt <rostedt@xxxxxxxxxxx>
CommitDate: Wed, 21 Dec 2011 07:25:57 -0500
tracing: Have stack_tracer use a separate list of functions
The stack_tracer is used to look at every function and check
if the current stack is bigger than the last recorded max stack size.
When a new max is found, then it saves that stack off.
Currently the stack tracer is limited by the global_ops of
the function tracer. As the stack tracer has nothing to do with
the ftrace function tracer, except that it uses it as its internal
engine, the stack tracer should have its own list.
A new file is added to the tracing debugfs directory called:
stack_trace_filter
that can be used to select which functions you want to check the stack
on.
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
kernel/trace/trace_stack.c | 19 ++++++++++++++++++-
1 files changed, 18 insertions(+), 1 deletions(-)
diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index 77575b3..0398b7c 100644
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -133,7 +133,6 @@ stack_trace_call(unsigned long ip, unsigned long parent_ip)
static struct ftrace_ops trace_ops __read_mostly =
{
.func = stack_trace_call,
- .flags = FTRACE_OPS_FL_GLOBAL,
};
static ssize_t
@@ -311,6 +310,21 @@ static const struct file_operations stack_trace_fops = {
.release = seq_release,
};
+static int
+stack_trace_filter_open(struct inode *inode, struct file *file)
+{
+ return ftrace_regex_open(&trace_ops, FTRACE_ITER_FILTER,
+ inode, file);
+}
+
+static const struct file_operations stack_trace_filter_fops = {
+ .open = stack_trace_filter_open,
+ .read = seq_read,
+ .write = ftrace_filter_write,
+ .llseek = ftrace_regex_lseek,
+ .release = ftrace_regex_release,
+};
+
int
stack_trace_sysctl(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp,
@@ -358,6 +372,9 @@ static __init int stack_trace_init(void)
trace_create_file("stack_trace", 0444, d_tracer,
NULL, &stack_trace_fops);
+ trace_create_file("stack_trace_filter", 0444, d_tracer,
+ NULL, &stack_trace_filter_fops);
+
if (stack_tracer_enabled)
register_ftrace_function(&trace_ops);
--
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