linux-kernel - Re: [PATCH v9 01/12] user_events: Add minimal support for trace

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Message-Id: <20220118004517.b9dda3d98d6c5d6233ac8886@kernel.org>
Date:   Tue, 18 Jan 2022 00:45:17 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Beau Belgrave <beaub@...ux.microsoft.com>
Cc:     rostedt@...dmis.org, linux-trace-devel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 01/12] user_events: Add minimal support for
 trace_event into ftrace

Hi Beau,

On Tue, 11 Jan 2022 09:25:51 -0800
Beau Belgrave <beaub@...ux.microsoft.com> wrote:

> +static int user_event_show(struct seq_file *m, struct dyn_event *ev)
> +{
> +	struct user_event *user = container_of(ev, struct user_event, devent);
> +	struct ftrace_event_field *field, *next;
> +	struct list_head *head;
> +	int depth = 0;
> +
> +	seq_printf(m, "%s%s", USER_EVENTS_PREFIX, EVENT_NAME(user));
> +
> +	head = trace_get_fields(&user->call);
> +
> +	list_for_each_entry_safe_reverse(field, next, head, link) {
> +		if (depth == 0)
> +			seq_puts(m, " ");
> +		else
> +			seq_puts(m, "; ");
> +		seq_printf(m, "%s %s", field->type, field->name);
> +		depth++;
> +	}
> +
> +	seq_puts(m, "\n");
> +
> +	return 0;
> +}

Let me confirm just one point. Your syntax supports

[__data_loc|__rel_loc] [unsigned] TYPE[\[LEN\]] NAME

or

struct TYPE NAME SIZE

for the fields, right? In that case, above seq_printf() seems not enough.

Thank you,


-- 
Masami Hiramatsu <mhiramat@...nel.org>