From 8d51735fcd2be1791c0bfe2d581d9063281fe7fb Mon Sep 17 00:00:00 2001 From: Jin Yao Date: Tue, 18 Jul 2017 20:13:12 +0800 Subject: [PATCH] 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: Yao Jin Acked-by: Jiri Olsa Cc: Alexander Shishkin Cc: Andi Kleen Cc: Kan Liang Cc: Michael Ellerman Cc: Peter Zijlstra 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: Arnaldo Carvalho de Melo --- tools/perf/util/callchain.c | 104 +++++++++++++++--------------------- 1 file changed, 43 insertions(+), 61 deletions(-) diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c index b4204b43ed58..917f4d6510ae 100644 --- a/tools/perf/util/callchain.c +++ b/tools/perf/util/callchain.c @@ -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)"); + if (predicted_count < branch_count) { + printed += count_float_printf(i++, "predicted", + predicted_count * 100.0 / branch_count, + bf + printed, bfsize - printed); + } + + 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 (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); + printed += count_pri64_printf(i++, "iterations", + iter_count / samples_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 (i) + return scnprintf(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 ((cycles > 0) || (istr != (char *)null_str)) - return scnprintf(bf, bfsize, - " (predicted:%.1f%% abort:%" PRId64 " %s%s)", - predicted_percent, abort_count, cstr, istr); - - 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,