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authorAndi Kleen <ak@linux.intel.com>2014-11-12 18:05:22 -0800
committerArnaldo Carvalho de Melo <acme@redhat.com>2014-12-01 20:00:31 -0300
commitfa94c36c29ed8bb4749b5fd7ea51a593f673dcef (patch)
treec8e546dc28a20521f02d63e420bd858d98965b52
parent8b7bad58efb7e3aaff60f7c1fa4361fb8c23181d (diff)
downloadop-kernel-dev-fa94c36c29ed8bb4749b5fd7ea51a593f673dcef.zip
op-kernel-dev-fa94c36c29ed8bb4749b5fd7ea51a593f673dcef.tar.gz
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 <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>
-rw-r--r--tools/perf/Documentation/perf-report.txt5
-rw-r--r--tools/perf/builtin-report.c26
2 files changed, 27 insertions, 4 deletions
diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
index 22706be..dd7cccd 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>::
Path to objdump binary.
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 410d44f..fb272ff 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 [<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 @@ 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) {
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