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Commit 1a93f8bd authored by Steven Rostedt (VMware)'s avatar Steven Rostedt (VMware)
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tracing: Have the snapshot trigger use the mapping helper functions 



As the data pointer for individual ips will soon be removed and no longer
passed to the callback function probe handlers, convert the snapshot
trigger counter over to the new ftrace_func_mapper helper functions.

Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent 41794f19

kernel/trace/trace.c

+44 −8
Original line number Diff line number Diff line
@@ -6745,13 +6745,19 @@ static void 
ftrace_count_snapshot(unsigned long ip, unsigned long parent_ip,

		      struct ftrace_probe_ops *ops, void **data)

{

	unsigned long *count = (long *)data;

	struct ftrace_func_mapper *mapper = ops->private_data;

	long *count = NULL;



	if (!*count)

	if (mapper)

		count = (long *)ftrace_func_mapper_find_ip(mapper, ip);



	if (count) {



		if (*count <= 0)

			return;



	if (*count != -1)

		(*count)--;

	}



	tracing_snapshot();

}
@@ -6760,20 +6766,42 @@ static int 
ftrace_snapshot_print(struct seq_file *m, unsigned long ip,

		      struct ftrace_probe_ops *ops, void *data)

{

	long count = (long)data;

	struct ftrace_func_mapper *mapper = ops->private_data;

	long *count = NULL;



	seq_printf(m, "%ps:", (void *)ip);



	seq_puts(m, "snapshot");



	if (count == -1)

		seq_puts(m, ":unlimited\n");

	if (mapper)

		count = (long *)ftrace_func_mapper_find_ip(mapper, ip);



	if (count)

		seq_printf(m, ":count=%ld\n", *count);

	else

		seq_printf(m, ":count=%ld\n", count);

		seq_puts(m, ":unlimited\n");



	return 0;

}



static int

ftrace_snapshot_init(struct ftrace_probe_ops *ops, unsigned long ip,

		     void **data)

{

	struct ftrace_func_mapper *mapper = ops->private_data;



	return ftrace_func_mapper_add_ip(mapper, ip, *data);

}



static void

ftrace_snapshot_free(struct ftrace_probe_ops *ops, unsigned long ip,

		     void **_data)

{

	struct ftrace_func_mapper *mapper = ops->private_data;



	ftrace_func_mapper_remove_ip(mapper, ip);

}



static struct ftrace_probe_ops snapshot_probe_ops = {

	.func			= ftrace_snapshot,

	.print			= ftrace_snapshot_print,
@@ -6782,6 +6810,8 @@ static struct ftrace_probe_ops snapshot_probe_ops = { 
static struct ftrace_probe_ops snapshot_count_probe_ops = {

	.func			= ftrace_count_snapshot,

	.print			= ftrace_snapshot_print,

	.init			= ftrace_snapshot_init,

	.free			= ftrace_snapshot_free,

};



static int
@@ -6812,6 +6842,12 @@ ftrace_trace_snapshot_callback(struct ftrace_hash *hash, 
	if (!strlen(number))

		goto out_reg;



	if (!ops->private_data) {

		ops->private_data = allocate_ftrace_func_mapper();

		if (!ops->private_data)

			return -ENOMEM;

	}



	/*

	 * We use the callback data field (which is a pointer)

	 * as our counter.