linux-kernel - Re: [PATCH v12 2/4] trace/objtrace: Get the value of the object

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Date:   Sun, 26 Jun 2022 00:58:24 +0900
From:   Masami Hiramatsu (Google) <mhiramat@...nel.org>
To:     Jeff Xie <xiehuan09@...il.com>
Cc:     rostedt@...dmis.org, mingo@...hat.com, mhiramat@...nel.org,
        zanussi@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v12 2/4] trace/objtrace: Get the value of the object

Hi,

On Tue,  7 Jun 2022 00:09:41 +0800
Jeff Xie <xiehuan09@...il.com> wrote:

> @@ -176,9 +275,27 @@ trace_object_trigger(struct event_trigger_data *data,
>  
>  	field = obj_data->field;
>  	memcpy(&obj, rec + field->offset, sizeof(obj));
> -	set_trace_object(obj, tr);
> +	/* set the offset from the special object and the type size of the value*/
> +	set_trace_object(obj, obj_data->obj_offset,
> +			obj_data->obj_value_type_size, tr);
>  }
>  
> +static const struct objtrace_fetch_type objtrace_fetch_types[] = {
> +	{"u8", 1},
> +	{"s8", 1},
> +	{"x8", 1},
> +	{"u16", 2},
> +	{"s16", 2},
> +	{"x16", 2},
> +	{"u32", 4},
> +	{"s32", 4},
> +	{"x32", 4},
> +	{"u64", 8},
> +	{"s64", 8},
> +	{"x64", 8},
> +	{NULL, 0},
> +};

As I said before, please use only 'uX' types at this moment,
since the objtrace event doesn't show the value with sign.
This means it only supports 'uX'. 

Thank you,


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>