ftrace: Add enabled_functions file (647bcd03) · Commits · 戴 / test

kernel/trace/ftrace.c

+49 −2

Original line number	Diff line number	Diff line
		@@ -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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