From fa94c36c29ed8bb4749b5fd7ea51a593f673dcef Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Wed, 12 Nov 2014 18:05:22 -0800 Subject: [PATCH] perf report: Add --branch-history option Add a --branch-history option to perf report that changes all the settings necessary for using the branches in callstacks. This is just a short cut to make this nicer to use, it does not enable any functionality by itself. v2: Change sort order. Rename option to --branch-history to be less confusing. v3: Updates v4: Fix conflict with newer perf base v5: Port to latest tip v6: Add more comments. Remove CCKEY_ADDRESS setting. Remove unnecessary branch_mode setting. Use a boolean. Signed-off-by: Andi Kleen Cc: Jiri Olsa Cc: Namhyung Kim Link: http://lkml.kernel.org/r/1415844328-4884-5-git-send-email-andi@firstfloor.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/Documentation/perf-report.txt | 5 +++++ tools/perf/builtin-report.c | 26 ++++++++++++++++++++---- 2 files changed, 27 insertions(+), 4 deletions(-) diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt index 22706beffabc..dd7cccdde498 100644 --- a/tools/perf/Documentation/perf-report.txt +++ b/tools/perf/Documentation/perf-report.txt @@ -271,6 +271,11 @@ OPTIONS branch stacks and it will automatically switch to the branch view mode, unless --no-branch-stack is used. +--branch-history:: + Add the addresses of sampled taken branches to the callstack. + This allows to examine the path the program took to each sample. + The data collection must have used -b (or -j) and -g. + --objdump=:: Path to objdump binary. diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c index 410d44fac64f..fb272ff435c9 100644 --- a/tools/perf/builtin-report.c +++ b/tools/perf/builtin-report.c @@ -226,8 +226,9 @@ static int report__setup_sample_type(struct report *rep) return -EINVAL; } if (symbol_conf.use_callchain) { - ui__error("Selected -g but no callchain data. Did " - "you call 'perf record' without -g?\n"); + ui__error("Selected -g or --branch-history but no " + "callchain data. Did\n" + "you call 'perf record' without -g?\n"); return -1; } } else if (!rep->dont_use_callchains && @@ -575,6 +576,7 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused) struct stat st; bool has_br_stack = false; int branch_mode = -1; + bool branch_call_mode = false; char callchain_default_opt[] = "fractal,0.5,callee"; const char * const report_usage[] = { "perf report []", @@ -684,7 +686,10 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused) OPT_BOOLEAN(0, "group", &symbol_conf.event_group, "Show event group information together"), OPT_CALLBACK_NOOPT('b', "branch-stack", &branch_mode, "", - "use branch records for histogram filling", parse_branch_mode), + "use branch records for per branch histogram filling", + parse_branch_mode), + OPT_BOOLEAN(0, "branch-history", &branch_call_mode, + "add last branch records to call history"), OPT_STRING(0, "objdump", &objdump_path, "path", "objdump binary to use for disassembly and annotations"), OPT_BOOLEAN(0, "demangle", &symbol_conf.demangle, @@ -745,10 +750,23 @@ repeat: has_br_stack = perf_header__has_feat(&session->header, HEADER_BRANCH_STACK); - if ((branch_mode == -1 && has_br_stack) || branch_mode == 1) { + /* + * Branch mode is a tristate: + * -1 means default, so decide based on the file having branch data. + * 0/1 means the user chose a mode. + */ + if (((branch_mode == -1 && has_br_stack) || branch_mode == 1) && + branch_call_mode == -1) { sort__mode = SORT_MODE__BRANCH; symbol_conf.cumulate_callchain = false; } + if (branch_call_mode) { + callchain_param.branch_callstack = 1; + symbol_conf.use_callchain = true; + callchain_register_param(&callchain_param); + if (sort_order == NULL) + sort_order = "srcline,symbol,dso"; + } if (report.mem_mode) { if (sort__mode == SORT_MODE__BRANCH) { -- 2.20.1