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-rw-r--r--tools/perf/util/event.c18
1 files changed, 15 insertions, 3 deletions
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 1fc1c2f04772..17476df5c7b2 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -470,6 +470,17 @@ static int find_symbol_cb(void *arg, const char *name, char type,
return 1;
}
+u64 kallsyms__get_function_start(const char *kallsyms_filename,
+ const char *symbol_name)
+{
+ struct process_symbol_args args = { .name = symbol_name, };
+
+ if (kallsyms__parse(kallsyms_filename, &args, find_symbol_cb) <= 0)
+ return 0;
+
+ return args.start;
+}
+
int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
perf_event__handler_t process,
struct machine *machine,
@@ -480,13 +491,13 @@ int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
char path[PATH_MAX];
char name_buff[PATH_MAX];
struct map *map;
+ u64 start;
int err;
/*
* We should get this from /sys/kernel/sections/.text, but till that is
* available use this, and after it is use this as a fallback for older
* kernels.
*/
- struct process_symbol_args args = { .name = symbol_name, };
union perf_event *event = zalloc((sizeof(event->mmap) +
machine->id_hdr_size));
if (event == NULL) {
@@ -513,7 +524,8 @@ int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
}
}
- if (kallsyms__parse(filename, &args, find_symbol_cb) <= 0) {
+ start = kallsyms__get_function_start(filename, symbol_name);
+ if (!start) {
free(event);
return -ENOENT;
}
@@ -525,7 +537,7 @@ int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
event->mmap.header.type = PERF_RECORD_MMAP;
event->mmap.header.size = (sizeof(event->mmap) -
(sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
- event->mmap.pgoff = args.start;
+ event->mmap.pgoff = start;
event->mmap.start = map->start;
event->mmap.len = map->end - event->mmap.start;
event->mmap.pid = machine->pid;