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Subject[PATCH] Allow user to specify path to kallsyms file
Date
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.

Signed-off-by: David Ahern <daahern@cisco.com>
---
tools/perf/builtin-report.c | 2 ++
tools/perf/util/symbol.c | 9 +++++++--
tools/perf/util/symbol.h | 1 +
3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 5de405d..b0c6995 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -442,6 +442,8 @@ static const struct option options[] = {
"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 @@ static int dso__load_kernel_sym(struct dso *self, struct map *map,
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 @@ static int dso__load_kernel_sym(struct dso *self, struct map *map,
* 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 @@ struct symbol_conf {
show_cpu_utilization,
initialized;
const char *vmlinux_name,
+ *kallsyms_name,
*source_prefix,
*field_sep;
const char *default_guest_vmlinux_name,
--
1.7.2.3


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