linux-kernel - [tip:tracing/core] tracing: Simplify print_graph

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Message-ID: <tip-40699ef64a3203a79d0873da678d0423aa10ae3a@git.kernel.org>
Date:	Sun, 2 Aug 2009 19:39:33 GMT
From:	tip-bot for Lai Jiangshan <laijs@...fujitsu.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	fweisbec@...il.com, rostedt@...dmis.org, tglx@...utronix.de,
	laijs@...fujitsu.com
Subject: [tip:tracing/core] tracing: Simplify print_graph_cpu()

Commit-ID:  40699ef64a3203a79d0873da678d0423aa10ae3a
Gitweb:     http://git.kernel.org/tip/40699ef64a3203a79d0873da678d0423aa10ae3a
Author:     Lai Jiangshan <laijs@...fujitsu.com>
AuthorDate: Tue, 28 Jul 2009 20:26:06 +0800
Committer:  Frederic Weisbecker <fweisbec@...il.com>
CommitDate: Wed, 29 Jul 2009 01:04:32 +0200

tracing: Simplify print_graph_cpu()

print_graph_cpu() is little over-designed.

And "log10_all" may be wrong when there are holes in cpu_online_mask:
the max online cpu id > cpumask_weight(cpu_online_mask)

So change it by using a static column length for the cpu matching
nr_cpu_ids number of decimal characters.

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
LKML-Reference: <4A6EEE5E.2000001@...fujitsu.com>
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>


---
 kernel/trace/trace_functions_graph.c |   30 ++++--------------------------
 1 files changed, 4 insertions(+), 26 deletions(-)

diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index abf7c4a..e30472d 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -183,43 +183,19 @@ static void graph_trace_reset(struct trace_array *tr)
 	unregister_ftrace_graph();
 }
 
-static inline int log10_cpu(int nb)
-{
-	if (nb / 100)
-		return 3;
-	if (nb / 10)
-		return 2;
-	return 1;
-}
+static int max_bytes_for_cpu;
 
 static enum print_line_t
 print_graph_cpu(struct trace_seq *s, int cpu)
 {
-	int i;
 	int ret;
-	int log10_this = log10_cpu(cpu);
-	int log10_all = log10_cpu(cpumask_weight(cpu_online_mask));
-
 
 	/*
 	 * Start with a space character - to make it stand out
 	 * to the right a bit when trace output is pasted into
 	 * email:
 	 */
-	ret = trace_seq_printf(s, " ");
-
-	/*
-	 * Tricky - we space the CPU field according to the max
-	 * number of online CPUs. On a 2-cpu system it would take
-	 * a maximum of 1 digit - on a 128 cpu system it would
-	 * take up to 3 digits:
-	 */
-	for (i = 0; i < log10_all - log10_this; i++) {
-		ret = trace_seq_printf(s, " ");
-		if (!ret)
-			return TRACE_TYPE_PARTIAL_LINE;
-	}
-	ret = trace_seq_printf(s, "%d) ", cpu);
+	ret = trace_seq_printf(s, " %*d) ", max_bytes_for_cpu, cpu);
 	if (!ret)
 		return TRACE_TYPE_PARTIAL_LINE;
 
@@ -919,6 +895,8 @@ static struct tracer graph_trace __read_mostly = {
 
 static __init int init_graph_trace(void)
 {
+	max_bytes_for_cpu = snprintf(NULL, 0, "%d", nr_cpu_ids - 1);
+
 	return register_tracer(&graph_trace);
 }
 
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