Messages in this thread | | | Date | Wed, 15 Jan 2014 15:44:42 +0100 | From | Jiri Olsa <> | Subject | Re: [PATCH 3/6] perf, tools: Add --branch-history option to report v2 |
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On Mon, Jan 13, 2014 at 05:04:18PM -0800, Andi Kleen wrote: > From: Andi Kleen <ak@linux.intel.com> > > 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. > Signed-off-by: Andi Kleen <ak@linux.intel.com> > ---
SNIP
> @@ -729,7 +739,7 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused) > struct perf_session *session; > struct stat st; > bool has_br_stack = false; > - int branch_mode = -1; > + int branch_mode = -1, branch_call_mode = -1; > int ret = -1; > char callchain_default_opt[] = "fractal,0.5,callee"; > const char * const report_usage[] = { > @@ -838,7 +848,10 @@ 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_CALLBACK_NOOPT(0, "branch-history", &branch_call_mode, "", > + "add last branch records to call history", > + parse_branch_call_mode), > OPT_STRING(0, "objdump", &objdump_path, "path", > "objdump binary to use for disassembly and annotations"), > OPT_BOOLEAN(0, "demangle", &symbol_conf.demangle, > @@ -886,8 +899,16 @@ repeat: > has_br_stack = perf_header__has_feat(&session->header, > HEADER_BRANCH_STACK); > > - if (branch_mode == -1 && has_br_stack) > + if (branch_mode == -1 && has_br_stack && branch_call_mode == -1) > sort__mode = SORT_MODE__BRANCH; > + if (branch_call_mode != -1) { > + callchain_param.branch_callstack = 1; > + callchain_param.key = CCKEY_ADDRESS; > + symbol_conf.use_callchain = true; > + callchain_register_param(&callchain_param); > + if (sort_order == default_sort_order) > + sort_order = "srcline,symbol,dso"; > + }
this sort of settings needs to be in for the previous patch, to make the following command work:
$ perf report --call-graph=fractal,0.5,callee,function,branch
will just set symbol_conf.use_callchain, but the sorting stays as SORT_MODE__BRANCH.. and callchains are invisible
as you said in the changelog, this should be 'short cut to make this nicer to use', but it's actually currently the only way..
jirka
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