perf report: Allow user to specify path to kallsyms file
This is useful for analyzing a perf data file on a different system than
the one data was collected on and still include symbols from loaded
kernel modules in the output.
Commiter note: Updated the man page accordingly.
LKML-Reference: <1291775986-16475-1-git-send-email-daahern@cisco.com>
Signed-off-by: David Ahern <daahern@cisco.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
index 59a1f57..fefea77 100644
--- a/tools/perf/Documentation/perf-report.txt
+++ b/tools/perf/Documentation/perf-report.txt
@@ -104,6 +104,9 @@
--vmlinux=<file>::
vmlinux pathname
+--kallsyms=<file>::
+ kallsyms pathname
+
-m::
--modules::
Load module symbols. WARNING: This should only be used with -k and
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 904519f..b6a2a899 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -443,6 +443,8 @@
"dump raw trace in ASCII"),
OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
"file", "vmlinux pathname"),
+ OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
+ "file", "kallsyms pathname"),
OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
"load module symbols - WARNING: use only with -k and LIVE kernel"),
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index a348906..f40c076 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1830,8 +1830,8 @@
const char *kallsyms_filename = NULL;
char *kallsyms_allocated_filename = NULL;
/*
- * Step 1: if the user specified a vmlinux filename, use it and only
- * it, reporting errors to the user if it cannot be used.
+ * Step 1: if the user specified a kallsyms or vmlinux filename, use
+ * it and only it, reporting errors to the user if it cannot be used.
*
* For instance, try to analyse an ARM perf.data file _without_ a
* build-id, or if the user specifies the wrong path to the right
@@ -1844,6 +1844,11 @@
* validation in dso__load_vmlinux and will bail out if they don't
* match.
*/
+ if (symbol_conf.kallsyms_name != NULL) {
+ kallsyms_filename = symbol_conf.kallsyms_name;
+ goto do_kallsyms;
+ }
+
if (symbol_conf.vmlinux_name != NULL) {
err = dso__load_vmlinux(self, map,
symbol_conf.vmlinux_name, filter);
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index 038f220..12defbe 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -72,6 +72,7 @@
show_cpu_utilization,
initialized;
const char *vmlinux_name,
+ *kallsyms_name,
*source_prefix,
*field_sep;
const char *default_guest_vmlinux_name,