Commit-ID: 647bcd03d5b2fb44fd9c9ef1a4f50c2eee8f779a
Gitweb: http://git.kernel.org/tip/647bcd03d5b2fb44fd9c9ef1a4f50c2eee8f779a
Author: Steven Rostedt <srostedt@xxxxxxxxxx>
AuthorDate: Tue, 3 May 2011 14:39:21 -0400
Committer: Steven Rostedt <rostedt@xxxxxxxxxxx>
CommitDate: Wed, 18 May 2011 15:29:47 -0400
ftrace: Add enabled_functions file
Add the enabled_functions file that is used to show all the
functions that have been enabled for tracing as well as their
ref counts. This helps seeing if any function has been registered
and what functions are being traced.
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
kernel/trace/ftrace.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 49 insertions(+), 2 deletions(-)
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 5dd332c..065f1e6 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -1703,6 +1703,7 @@ enum {
FTRACE_ITER_NOTRACE = (1 << 1),
FTRACE_ITER_PRINTALL = (1 << 2),
FTRACE_ITER_HASH = (1 << 3),
+ FTRACE_ITER_ENABLED = (1 << 4),
};
#define FTRACE_BUFF_MAX (KSYM_SYMBOL_LEN+4) /* room for wildcards */
@@ -1842,7 +1843,11 @@ t_next(struct seq_file *m, void *v, loff_t *pos)
!(ftrace_lookup_ip(ops->filter_hash, rec->ip))) ||
((iter->flags & FTRACE_ITER_NOTRACE) &&
- !ftrace_lookup_ip(ops->notrace_hash, rec->ip))) {
+ !ftrace_lookup_ip(ops->notrace_hash, rec->ip)) ||
+
+ ((iter->flags & FTRACE_ITER_ENABLED) &&
+ !(rec->flags & ~FTRACE_FL_MASK))) {
+
rec = NULL;
goto retry;
}
@@ -1944,7 +1949,11 @@ static int t_show(struct seq_file *m, void *v)
if (!rec)
return 0;
- seq_printf(m, "%ps\n", (void *)rec->ip);
+ seq_printf(m, "%ps", (void *)rec->ip);
+ if (iter->flags & FTRACE_ITER_ENABLED)
+ seq_printf(m, " (%ld)",
+ rec->flags & ~FTRACE_FL_MASK);
+ seq_printf(m, "\n");
return 0;
}
@@ -1983,6 +1992,34 @@ ftrace_avail_open(struct inode *inode, struct file *file)
return ret;
}
+static int
+ftrace_enabled_open(struct inode *inode, struct file *file)
+{
+ struct ftrace_iterator *iter;
+ int ret;
+
+ if (unlikely(ftrace_disabled))
+ return -ENODEV;
+
+ iter = kzalloc(sizeof(*iter), GFP_KERNEL);
+ if (!iter)
+ return -ENOMEM;
+
+ iter->pg = ftrace_pages_start;
+ iter->flags = FTRACE_ITER_ENABLED;
+
+ ret = seq_open(file, &show_ftrace_seq_ops);
+ if (!ret) {
+ struct seq_file *m = file->private_data;
+
+ m->private = iter;
+ } else {
+ kfree(iter);
+ }
+
+ return ret;
+}
+
static void ftrace_filter_reset(struct ftrace_hash *hash)
{
mutex_lock(&ftrace_lock);
@@ -2838,6 +2875,13 @@ static const struct file_operations ftrace_avail_fops = {
.release = seq_release_private,
};
+static const struct file_operations ftrace_enabled_fops = {
+ .open = ftrace_enabled_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release_private,
+};
+
static const struct file_operations ftrace_filter_fops = {
.open = ftrace_filter_open,
.read = seq_read,
@@ -3069,6 +3113,9 @@ static __init int ftrace_init_dyn_debugfs(struct dentry *d_tracer)
trace_create_file("available_filter_functions", 0444,
d_tracer, NULL, &ftrace_avail_fops);
+ trace_create_file("enabled_functions", 0444,
+ d_tracer, NULL, &ftrace_enabled_fops);
+
trace_create_file("set_ftrace_filter", 0644, d_tracer,
NULL, &ftrace_filter_fops);
--
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