linux-kernel - Re: [PATCH 1/2] tracing: Fix function graph duration format for 7-digit number

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Date:	Thu, 16 Jul 2015 21:44:36 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Jungseok Lee <jungseoklee85@...il.com>
Cc:	mingo@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] tracing: Fix function graph duration format for
 7-digit number

On Sat, 11 Jul 2015 14:51:39 +0000
Jungseok Lee <jungseoklee85@...il.com> wrote:

> diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
> index 8968bf7..0bc16c4 100644
> --- a/kernel/trace/trace_functions_graph.c
> +++ b/kernel/trace/trace_functions_graph.c
> @@ -716,6 +716,8 @@ trace_print_graph_duration(unsigned long long duration, struct trace_seq *s)
>  		snprintf(nsecs_str, slen, "%03lu", nsecs_rem);
>  		trace_seq_printf(s, ".%s", nsecs_str);
>  		len += strlen(nsecs_str);
> +	} else if (len == 7) {
> +		len -= 1;

Don't you mean len--;

>  	}
>  
>  	trace_seq_puts(s, " us ");

I don't care much for an extra branch here. I'm going to go with the
following patch:

-- Steve

diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 8968bf720c12..ca98445782ac 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -715,13 +715,13 @@ trace_print_graph_duration(unsigned long long duration, struct trace_seq *s)
 
 		snprintf(nsecs_str, slen, "%03lu", nsecs_rem);
 		trace_seq_printf(s, ".%s", nsecs_str);
-		len += strlen(nsecs_str);
+		len += strlen(nsecs_str) + 1;
 	}
 
 	trace_seq_puts(s, " us ");
 
 	/* Print remaining spaces to fit the row's width */
-	for (i = len; i < 7; i++)
+	for (i = len; i < 8; i++)
 		trace_seq_putc(s, ' ');
 }
 
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