perf tools: Support callchain sorting based on addresses

With programs with very large functions it can be useful to distinguish
the callgraph nodes on more than just function names. So for example if
you have multiple calls to the same function, it ends up being separate
nodes in the chain.

This patch adds a new key field to the callgraph options, that allows
comparing nodes on functions (as today, default) and addresses.

Longer term it would be nice to also handle src lines, but that would
need more changes and address is a reasonable proxy for it today.

I right now reference the global params, as there was no simple way to
register a params pointer.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/n/tip-0uskktybf0e7wrnoi5e9b9it@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 15 insertions, 4 deletions

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index a34c587900c7..d785d89ed226 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -667,12 +667,23 @@ parse_callchain_opt(const struct option *opt, const char *arg, int unset)
 	}
 
 	/* get the call chain order */
-	if (!strcmp(tok2, "caller"))
+	if (!strncmp(tok2, "caller", strlen("caller")))
 		callchain_param.order = ORDER_CALLER;
-	else if (!strcmp(tok2, "callee"))
+	else if (!strncmp(tok2, "callee", strlen("callee")))
 		callchain_param.order = ORDER_CALLEE;
 	else
 		return -1;
+
+	/* Get the sort key */
+	tok2 = strtok(NULL, ",");
+	if (!tok2)
+		goto setup;
+	if (!strncmp(tok2, "function", strlen("function")))
+		callchain_param.key = CCKEY_FUNCTION;
+	else if (!strncmp(tok2, "address", strlen("address")))
+		callchain_param.key = CCKEY_ADDRESS;
+	else
+		return -1;
 setup:
 	if (callchain_register_param(&callchain_param) < 0) {
 		fprintf(stderr, "Can't register callchain params\n");
@@ -784,8 +795,8 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused)
 	OPT_BOOLEAN('x', "exclude-other", &symbol_conf.exclude_other,
 		    "Only display entries with parent-match"),
 	OPT_CALLBACK_DEFAULT('g', "call-graph", &report, "output_type,min_percent[,print_limit],call_order",
-		     "Display callchains using output_type (graph, flat, fractal, or none) , min percent threshold, optional print limit and callchain order. "
-		     "Default: fractal,0.5,callee", &parse_callchain_opt, callchain_default_opt),
+		     "Display callchains using output_type (graph, flat, fractal, or none) , min percent threshold, optional print limit, callchain order, key (function or address). "
+		     "Default: fractal,0.5,callee,function", &parse_callchain_opt, callchain_default_opt),
 	OPT_BOOLEAN('G', "inverted", &report.inverted_callchain,
 		    "alias for inverted call graph"),
 	OPT_CALLBACK(0, "ignore-callees", NULL, "regex",