linux-kernel - [tip:perf/core] perf symbols: Allow loading kallsyms without considering kcore files

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Date:	Sat, 23 Apr 2016 06:04:57 -0700
From:	tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	adrian.hunter@...el.com, namhyung@...nel.org, tglx@...utronix.de,
	mingo@...nel.org, acme@...hat.com, dsahern@...il.com,
	linux-kernel@...r.kernel.org, wangnan0@...wei.com, hpa@...or.com,
	jolsa@...nel.org
Subject: [tip:perf/core] perf symbols: Allow loading kallsyms without
 considering kcore files

Commit-ID:  e02092b9a922f17e951b2df5f12f4aafe7383a21
Gitweb:     http://git.kernel.org/tip/e02092b9a922f17e951b2df5f12f4aafe7383a21
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Tue, 19 Apr 2016 12:12:49 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Tue, 19 Apr 2016 12:38:56 -0300

perf symbols: Allow loading kallsyms without considering kcore files

Before the support for using /proc/kcore was introduced, the kallsyms
routines used /proc/modules and the first 'perf test' entry expected
finding maps for each module in the system, which is not the case with
the kcore code. Provide a way to ignore kcore files so that the test can
have its expectations met.

Improving the test to cover kcore files as well needs to be done.

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Wang Nan <wangnan0@...wei.com>
Link: http://lkml.kernel.org/n/tip-ek5urnu103dlhfk4l6pcw041@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/machine.c | 12 +++++++++---
 tools/perf/util/machine.h |  2 ++
 tools/perf/util/symbol.c  | 12 +++++++++---
 tools/perf/util/symbol.h  |  2 ++
 4 files changed, 22 insertions(+), 6 deletions(-)

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 52b51e0..656c1d7 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -908,11 +908,11 @@ int machines__create_kernel_maps(struct machines *machines, pid_t pid)
 	return machine__create_kernel_maps(machine);
 }
 
-int machine__load_kallsyms(struct machine *machine, const char *filename,
-			   enum map_type type, symbol_filter_t filter)
+int __machine__load_kallsyms(struct machine *machine, const char *filename,
+			     enum map_type type, bool no_kcore, symbol_filter_t filter)
 {
 	struct map *map = machine__kernel_map(machine);
-	int ret = dso__load_kallsyms(map->dso, filename, map, filter);
+	int ret = __dso__load_kallsyms(map->dso, filename, map, no_kcore, filter);
 
 	if (ret > 0) {
 		dso__set_loaded(map->dso, type);
@@ -927,6 +927,12 @@ int machine__load_kallsyms(struct machine *machine, const char *filename,
 	return ret;
 }
 
+int machine__load_kallsyms(struct machine *machine, const char *filename,
+			   enum map_type type, symbol_filter_t filter)
+{
+	return __machine__load_kallsyms(machine, filename, type, false, filter);
+}
+
 int machine__load_vmlinux_path(struct machine *machine, enum map_type type,
 			       symbol_filter_t filter)
 {
diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h
index 382873b..4822de5 100644
--- a/tools/perf/util/machine.h
+++ b/tools/perf/util/machine.h
@@ -215,6 +215,8 @@ struct symbol *machine__find_kernel_function_by_name(struct machine *machine,
 struct map *machine__findnew_module_map(struct machine *machine, u64 start,
 					const char *filename);
 
+int __machine__load_kallsyms(struct machine *machine, const char *filename,
+			     enum map_type type, bool no_kcore, symbol_filter_t filter);
 int machine__load_kallsyms(struct machine *machine, const char *filename,
 			   enum map_type type, symbol_filter_t filter);
 int machine__load_vmlinux_path(struct machine *machine, enum map_type type,
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index a36823c..415c4f6 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1208,8 +1208,8 @@ static int kallsyms__delta(struct map *map, const char *filename, u64 *delta)
 	return 0;
 }
 
-int dso__load_kallsyms(struct dso *dso, const char *filename,
-		       struct map *map, symbol_filter_t filter)
+int __dso__load_kallsyms(struct dso *dso, const char *filename,
+			 struct map *map, bool no_kcore, symbol_filter_t filter)
 {
 	u64 delta = 0;
 
@@ -1230,12 +1230,18 @@ int dso__load_kallsyms(struct dso *dso, const char *filename,
 	else
 		dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
 
-	if (!dso__load_kcore(dso, map, filename))
+	if (!no_kcore && !dso__load_kcore(dso, map, filename))
 		return dso__split_kallsyms_for_kcore(dso, map, filter);
 	else
 		return dso__split_kallsyms(dso, map, delta, filter);
 }
 
+int dso__load_kallsyms(struct dso *dso, const char *filename,
+		       struct map *map, symbol_filter_t filter)
+{
+	return __dso__load_kallsyms(dso, filename, map, false, filter);
+}
+
 static int dso__load_perf_map(struct dso *dso, struct map *map,
 			      symbol_filter_t filter)
 {
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index 1da7b10..c8e4397 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -240,6 +240,8 @@ int dso__load_vmlinux(struct dso *dso, struct map *map,
 		      symbol_filter_t filter);
 int dso__load_vmlinux_path(struct dso *dso, struct map *map,
 			   symbol_filter_t filter);
+int __dso__load_kallsyms(struct dso *dso, const char *filename, struct map *map,
+			 bool no_kcore, symbol_filter_t filter);
 int dso__load_kallsyms(struct dso *dso, const char *filename, struct map *map,
 		       symbol_filter_t filter);