Commit 8d51735f authored by Jin Yao's avatar Jin Yao Committed by Arnaldo Carvalho de Melo
Browse files

perf report: Refactor the branch info printing code 



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:

v6: 1. Put the multiline condition code into {} brackets in
       counts_str_build()

    2. Keep the original display order, that is:
       predicted, abort, cycles, iterations

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

Signed-off-by: default avatarYao Jin <yao.jin@linux.intel.com>
Acked-by: default avatarJiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1500379995-6449-5-git-send-email-yao.jin@linux.intel.com


[ Don't use 'index' as a name for a variable, it shadows a globa decl in older distros ]
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 60f83fa6

tools/perf/util/callchain.c

+41 −59
Original line number Diff line number Diff line
@@ -1214,83 +1214,65 @@ int callchain_branch_counts(struct callchain_root *root, 
						  cycles_count);

}



static int count_pri64_printf(int idx, const char *str, u64 value, char *bf, int bfsize)

{

	int printed;



	printed = scnprintf(bf, bfsize, "%s%s:%" PRId64 "", (idx) ? " " : " (", str, value);



	return printed;

}



static int count_float_printf(int idx, const char *str, float value, char *bf, int bfsize)

{

	int printed;



	printed = scnprintf(bf, bfsize, "%s%s:%.1f%%", (idx) ? " " : " (", 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 (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;



	predicted_percent = predicted_count * 100.0 / branch_count;



	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) {

		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,

				" (predicted:%.1f%% %s%s)",

				predicted_percent, cstr, istr);

		else {

			return scnprintf(bf, bfsize,

				" (predicted:%.1f%%)",

				predicted_percent);

	if (abort_count) {

		printed += count_float_printf(i++, "abort",

				abort_count * 100.0 / branch_count,

				bf + printed, bfsize - printed);

	}



	cycles = cycles_count / branch_count;

	if (cycles) {

		printed += count_pri64_printf(i++, "cycles",

				cycles,

				bf + printed, bfsize - printed);

	}



	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 (iter_count && samples_count) {

		printed += count_pri64_printf(i++, "iterations",

				iter_count / samples_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,

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