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perf report: Add --branch-history option

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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 <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/1415844328-4884-5-git-send-email-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Andi Kleen 2014-11-12 18:05:22 -08:00 committed by Arnaldo Carvalho de Melo
parent 8b7bad58ef
commit fa94c36c29
2 changed files with 27 additions and 4 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

5
tools/perf/Documentation/perf-report.txt
View file

@ -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>::
Path to objdump binary.

24
tools/perf/builtin-report.c
View file

@ -226,7 +226,8 @@ 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 "
ui__error("Selected -g or --branch-history but no "
"callchain data. Did\n"
"you call 'perf record' without -g?\n");
return -1;
}
@ -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 [<options>]",
@ -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 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused)
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) {