From 2d78b18952a1bdf125d13fa6bb68fbc5c1b0aed9 Mon Sep 17 00:00:00 2001 From: Jin Yao Date: Tue, 18 Jul 2017 20:13:14 +0800 Subject: [PATCH] perf report: Show branch type statistics for stdio mode Show the branch type statistics at the end of perf report --stdio. For example: perf report --stdio COND_FWD: 28.5% COND_BWD: 9.4% CROSS_4K: 0.7% CROSS_2M: 14.1% COND: 37.9% UNCOND: 0.2% IND: 6.7% CALL: 26.5% RET: 28.7% SYSRET: 0.0% The branch types are: COND_FWD: conditional forward COND_BWD: conditional backward COND: conditional branch UNCOND: unconditional branch IND: indirect CALL: function call IND_CALL: indirect function call RET: function return SYSCALL: syscall SYSRET: syscall return COND_CALL: conditional function call COND_RET: conditional function return CROSS_4K and CROSS_2M: They are the metrics checking for branches cross 4K or 2MB pages. It's an approximate computing. We don't know if the area is 4K or 2MB, so always compute both. To make the output simple, if a branch crosses 2M area, CROSS_4K will not be incremented. Change log v7: Since the common branch type definitions are changed, some tags/strings are updated accordingly. v6: Remove branch_type_stat_display() since it's moved to branch.c. v5: Remove the unnecessary sort__mode checking in hist_iter__branch_callback(). v4: Comparing to previous version, the major changes are: Add the computing of JCC forward/JCC backward and cross page checking by using the from and to addresses. 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/1500379995-6449-7-git-send-email-yao.jin@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-report.c | 25 +++++++++++++++++++++++++ tools/perf/util/hist.c | 5 +---- 2 files changed, 26 insertions(+), 4 deletions(-) diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c index 8e752ba5e887..cea25d03f4dd 100644 --- a/tools/perf/builtin-report.c +++ b/tools/perf/builtin-report.c @@ -38,6 +38,7 @@ #include "util/time-utils.h" #include "util/auxtrace.h" #include "util/units.h" +#include "util/branch.h" #include #include @@ -73,6 +74,7 @@ struct report { u64 queue_size; int socket_filter; DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS); + struct branch_type_stat brtype_stat; }; static int report__config(const char *var, const char *value, void *cb) @@ -150,6 +152,22 @@ out: return err; } +static int hist_iter__branch_callback(struct hist_entry_iter *iter, + struct addr_location *al __maybe_unused, + bool single __maybe_unused, + void *arg) +{ + struct hist_entry *he = iter->he; + struct report *rep = arg; + struct branch_info *bi; + + bi = he->branch_info; + branch_type_count(&rep->brtype_stat, &bi->flags, + bi->from.addr, bi->to.addr); + + return 0; +} + static int process_sample_event(struct perf_tool *tool, union perf_event *event, struct perf_sample *sample, @@ -188,6 +206,8 @@ static int process_sample_event(struct perf_tool *tool, */ if (!sample->branch_stack) goto out_put; + + iter.add_entry_cb = hist_iter__branch_callback; iter.ops = &hist_iter_branch; } else if (rep->mem_mode) { iter.ops = &hist_iter_mem; @@ -410,6 +430,9 @@ static int perf_evlist__tty_browse_hists(struct perf_evlist *evlist, perf_read_values_destroy(&rep->show_threads_values); } + if (sort__mode == SORT_MODE__BRANCH) + branch_type_stat_display(stdout, &rep->brtype_stat); + return 0; } @@ -944,6 +967,8 @@ repeat: if (has_br_stack && branch_call_mode) symbol_conf.show_branchflag_count = true; + memset(&report.brtype_stat, 0, sizeof(struct branch_type_stat)); + /* * Branch mode is a tristate: * -1 means default, so decide based on the file having branch data. diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c index cf0186a088c1..2f6c5e6c16f9 100644 --- a/tools/perf/util/hist.c +++ b/tools/perf/util/hist.c @@ -749,12 +749,9 @@ iter_prepare_branch_entry(struct hist_entry_iter *iter, struct addr_location *al } static int -iter_add_single_branch_entry(struct hist_entry_iter *iter, +iter_add_single_branch_entry(struct hist_entry_iter *iter __maybe_unused, struct addr_location *al __maybe_unused) { - /* to avoid calling callback function */ - iter->he = NULL; - return 0; } -- 2.30.2