diff mbox

[v5,4/7] perf report: Refactor the branch info printing code

Message ID 1492616894-3635-5-git-send-email-yao.jin@linux.intel.com (mailing list archive)
State Not Applicable
Headers show

Commit Message

Jin, Yao April 19, 2017, 3:48 p.m. UTC 
The branch info such as predicted/cycles/... are printed at the
callchain entries.

For example: perf report --branch-history --no-children --stdio

    --1.07%--main div.c:39 (predicted:52.4% cycles:1 iterations:17)
              main div.c:44 (predicted:52.4% cycles:1)
              main div.c:42 (cycles:2)
              compute_flag div.c:28 (cycles:2)
              compute_flag div.c:27 (cycles:1)
              rand rand.c:28 (cycles:1)
              rand rand.c:28 (cycles:1)
              __random random.c:298 (cycles:1)
              __random random.c:297 (cycles:1)
              __random random.c:295 (cycles:1)
              __random random.c:295 (cycles:1)
              __random random.c:295 (cycles:1)

But the current code is difficult to maintain and extend. This patch
refactors the code for easy maintenance.

Change log
----------

v5: It's a new patch in v5 patch series.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
---
 tools/perf/util/callchain.c | 106 +++++++++++++++++++-------------------------
 1 file changed, 45 insertions(+), 61 deletions(-)

Comments

Jiri Olsa April 19, 2017, 2:15 p.m. UTC | #1 
On Wed, Apr 19, 2017 at 11:48:11PM +0800, Jin Yao wrote:

SNIP

> +
>  static int counts_str_build(char *bf, int bfsize,
>  			     u64 branch_count, u64 predicted_count,
>  			     u64 abort_count, u64 cycles_count,
>  			     u64 iter_count, u64 samples_count)
>  {
> -	double predicted_percent = 0.0;
> -	const char *null_str = "";
> -	char iter_str[32];
> -	char cycle_str[32];
> -	char *istr, *cstr;
>  	u64 cycles;
> +	int printed = 0, i = 0;

I like it, but it looks like the previous code displayed those
bits in another order.. I managed to catch this one:

  1337c1337
  <              --0.53%--menu_select menu.c:218 (iterations:6 predicted:0.0%)
  ---
  >              --0.53%--menu_select menu.c:218 (predicted:0.0% iterations:6)

I think we better keep the current order, which seems
to be the goal of the original code as well

this function is perfect candidate for automated test ;-)
(something like we did in tests/kmod-path.c)

thanks,
jirka
Jiri Olsa April 19, 2017, 2:15 p.m. UTC | #2 
On Wed, Apr 19, 2017 at 11:48:11PM +0800, Jin Yao wrote:

SNIP

>  static int counts_str_build(char *bf, int bfsize,
>  			     u64 branch_count, u64 predicted_count,
>  			     u64 abort_count, u64 cycles_count,
>  			     u64 iter_count, u64 samples_count)
>  {
> -	double predicted_percent = 0.0;
> -	const char *null_str = "";
> -	char iter_str[32];
> -	char cycle_str[32];
> -	char *istr, *cstr;
>  	u64 cycles;
> +	int printed = 0, i = 0;
>  
>  	if (branch_count == 0)
>  		return scnprintf(bf, bfsize, " (calltrace)");
>  
>  	cycles = cycles_count / branch_count;
> +	if (cycles)
> +		printed += count_pri64_printf(i++, "cycles",
> +				cycles,
> +				bf + printed, bfsize - printed);
>  
> -	if (iter_count && samples_count) {
> -		if (cycles > 0)
> -			scnprintf(iter_str, sizeof(iter_str),
> -				 " iterations:%" PRId64 "",
> -				 iter_count / samples_count);
> -		else
> -			scnprintf(iter_str, sizeof(iter_str),
> -				 "iterations:%" PRId64 "",
> -				 iter_count / samples_count);
> -		istr = iter_str;
> -	} else
> -		istr = (char *)null_str;
> -
> -	if (cycles > 0) {
> -		scnprintf(cycle_str, sizeof(cycle_str),
> -			  "cycles:%" PRId64 "", cycles);
> -		cstr = cycle_str;
> -	} else
> -		cstr = (char *)null_str;
> +	if (iter_count && samples_count)
> +		printed += count_pri64_printf(i++, "iterations",
> +				iter_count / samples_count,
> +				bf + printed, bfsize - printed);

please put the multiline condition code into {} brackets
for all of the cases in this function

thanks,
jirka
diff mbox

Patch

diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
index 2e5eff5..8cae8a6 100644
--- a/tools/perf/util/callchain.c
+++ b/tools/perf/util/callchain.c
@@ -1105,83 +1105,67 @@  int callchain_branch_counts(struct callchain_root *root,
 						  cycles_count);
 }
 
+static int count_pri64_printf(int index, const char *str, u64 value,
+	char *bf, int bfsize)
+{
+	int printed;
+
+	printed = scnprintf(bf, bfsize,
+		"%s%s:%" PRId64 "",
+		(index) ? " " : " (", str, value);
+
+	return printed;
+}
+
+static int count_float_printf(int index, const char *str, float value,
+	char *bf, int bfsize)
+{
+	int printed;
+
+	printed = scnprintf(bf, bfsize,
+		"%s%s:%.1f%%",
+		(index) ? " " : " (", str, value);
+
+	return printed;
+}
+
 static int counts_str_build(char *bf, int bfsize,
 			     u64 branch_count, u64 predicted_count,
 			     u64 abort_count, u64 cycles_count,
 			     u64 iter_count, u64 samples_count)
 {
-	double predicted_percent = 0.0;
-	const char *null_str = "";
-	char iter_str[32];
-	char cycle_str[32];
-	char *istr, *cstr;
 	u64 cycles;
+	int printed = 0, i = 0;
 
 	if (branch_count == 0)
 		return scnprintf(bf, bfsize, " (calltrace)");
 
 	cycles = cycles_count / branch_count;
+	if (cycles)
+		printed += count_pri64_printf(i++, "cycles",
+				cycles,
+				bf + printed, bfsize - printed);
 
-	if (iter_count && samples_count) {
-		if (cycles > 0)
-			scnprintf(iter_str, sizeof(iter_str),
-				 " iterations:%" PRId64 "",
-				 iter_count / samples_count);
-		else
-			scnprintf(iter_str, sizeof(iter_str),
-				 "iterations:%" PRId64 "",
-				 iter_count / samples_count);
-		istr = iter_str;
-	} else
-		istr = (char *)null_str;
-
-	if (cycles > 0) {
-		scnprintf(cycle_str, sizeof(cycle_str),
-			  "cycles:%" PRId64 "", cycles);
-		cstr = cycle_str;
-	} else
-		cstr = (char *)null_str;
+	if (iter_count && samples_count)
+		printed += count_pri64_printf(i++, "iterations",
+				iter_count / samples_count,
+				bf + printed, bfsize - printed);
 
-	predicted_percent = predicted_count * 100.0 / branch_count;
+	if (predicted_count < branch_count)
+		printed += count_float_printf(i++, "predicted",
+				predicted_count * 100.0 / branch_count,
+				bf + printed, bfsize - printed);
 
-	if ((predicted_count == branch_count) && (abort_count == 0)) {
-		if ((cycles > 0) || (istr != (char *)null_str))
-			return scnprintf(bf, bfsize, " (%s%s)", cstr, istr);
-		else
-			return scnprintf(bf, bfsize, "%s", (char *)null_str);
-	}
-
-	if ((predicted_count < branch_count) && (abort_count == 0)) {
-		if ((cycles > 0) || (istr != (char *)null_str))
-			return scnprintf(bf, bfsize,
-				" (predicted:%.1f%% %s%s)",
-				predicted_percent, cstr, istr);
-		else {
-			return scnprintf(bf, bfsize,
-				" (predicted:%.1f%%)",
-				predicted_percent);
-		}
-	}
-
-	if ((predicted_count == branch_count) && (abort_count > 0)) {
-		if ((cycles > 0) || (istr != (char *)null_str))
-			return scnprintf(bf, bfsize,
-				" (abort:%" PRId64 " %s%s)",
-				abort_count, cstr, istr);
-		else
-			return scnprintf(bf, bfsize,
-				" (abort:%" PRId64 ")",
-				abort_count);
-	}
+	if (abort_count)
+		printed += count_float_printf(i++, "abort",
+				abort_count * 100.0 / branch_count,
+				bf + printed, bfsize - printed);
 
-	if ((cycles > 0) || (istr != (char *)null_str))
-		return scnprintf(bf, bfsize,
-			" (predicted:%.1f%% abort:%" PRId64 " %s%s)",
-			predicted_percent, abort_count, cstr, istr);
+	if (i)
+		return scnprintf(bf + printed, bfsize - printed, ")");
 
-	return scnprintf(bf, bfsize,
-			" (predicted:%.1f%% abort:%" PRId64 ")",
-			predicted_percent, abort_count);
+	bf[0] = 0;
+	return 0;
 }
 
 static int callchain_counts_printf(FILE *fp, char *bf, int bfsize,