linux-kernel - Re: [PATCH v3 1/2] tracing: support "bool" type in synthetic trace events

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Date:   Mon, 12 Oct 2020 10:15:27 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Axel Rasmussen <axelrasmussen@...gle.com>,
        Tom Zanussi <zanussi@...nel.org>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michel Lespinasse <walken@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        Jann Horn <jannh@...gle.com>,
        Chinwen Chang <chinwen.chang@...iatek.com>,
        Yafang Shao <laoar.shao@...il.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v3 1/2] tracing: support "bool" type in synthetic trace
 events


Tom,

Can you ack this patch for me?

-- Steve


On Fri,  9 Oct 2020 15:05:23 -0700
Axel Rasmussen <axelrasmussen@...gle.com> wrote:

> It's common [1] to define tracepoint fields as "bool" when they contain
> a true / false value. Currently, defining a synthetic event with a
> "bool" field yields EINVAL. It's possible to work around this by using
> e.g. u8 (assuming sizeof(bool) is 1, and bool is unsigned; if either of
> these properties don't match, you get EINVAL [2]).
> 
> Supporting "bool" explicitly makes hooking this up easier and more
> portable for userspace.
> 
> [1]: grep -r "bool" include/trace/events/
> [2]: check_synth_field() in kernel/trace/trace_events_hist.c
> 
> Acked-by: Michel Lespinasse <walken@...gle.com>
> Signed-off-by: Axel Rasmussen <axelrasmussen@...gle.com>
> ---
>  kernel/trace/trace_events_synth.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/kernel/trace/trace_events_synth.c b/kernel/trace/trace_events_synth.c
> index 8e1974fbad0e..8f94c84349a6 100644
> --- a/kernel/trace/trace_events_synth.c
> +++ b/kernel/trace/trace_events_synth.c
> @@ -234,6 +234,8 @@ static int synth_field_size(char *type)
>  		size = sizeof(long);
>  	else if (strcmp(type, "unsigned long") == 0)
>  		size = sizeof(unsigned long);
> +	else if (strcmp(type, "bool") == 0)
> +		size = sizeof(bool);
>  	else if (strcmp(type, "pid_t") == 0)
>  		size = sizeof(pid_t);
>  	else if (strcmp(type, "gfp_t") == 0)
> @@ -276,6 +278,8 @@ static const char *synth_field_fmt(char *type)
>  		fmt = "%ld";
>  	else if (strcmp(type, "unsigned long") == 0)
>  		fmt = "%lu";
> +	else if (strcmp(type, "bool") == 0)
> +		fmt = "%d";
>  	else if (strcmp(type, "pid_t") == 0)
>  		fmt = "%d";
>  	else if (strcmp(type, "gfp_t") == 0)
> --
> 2.28.0.1011.ga647a8990f-goog