[PATCH 15/24] perf tools: Synthesize build id for kernel/modules/tasks

[Jiri Olsa]

Adding build id to synthesized mmap2 events for
everything - kernel/modules/tasks.

Signed-off-by: Jiri Olsa <jo...@kernel.org>
---
 tools/perf/util/synthetic-events.c | 32 ++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/tools/perf/util/synthetic-events.c 
b/tools/perf/util/synthetic-events.c
index a18ae502d765..91b1962d399c 100644
--- a/tools/perf/util/synthetic-events.c
+++ b/tools/perf/util/synthetic-events.c
@@ -347,6 +347,31 @@ static bool read_proc_maps_line(struct io *io, __u64 
*start, __u64 *end,
        }
 }
 
+static void perf_record_mmap2__read_build_id(struct perf_record_mmap2 *event,
+                                            bool is_kernel)
+{
+       struct build_id bid;
+       int rc;
+
+       if (is_kernel)
+               rc = sysfs__read_build_id("/sys/kernel/notes", &bid);
+       else
+               rc = filename__read_build_id(event->filename, &bid) > 0 ? 0 : 
-1;
+
+       if (rc == 0) {
+               memcpy(event->build_id, bid.data, sizeof(bid.data));
+               event->build_id_size = (u8) bid.size;
+               event->header.misc |= PERF_RECORD_MISC_MMAP_BUILD_ID;
+               event->__reserved_1 = 0;
+               event->__reserved_2 = 0;
+       } else {
+               if (event->filename[0] == '/') {
+                       pr_debug2("Failed to read build ID for %s\n",
+                                 event->filename);
+               }
+       }
+}
+
 int perf_event__synthesize_mmap_events(struct perf_tool *tool,
                                       union perf_event *event,
                                       pid_t pid, pid_t tgid,
@@ -453,6 +478,9 @@ int perf_event__synthesize_mmap_events(struct perf_tool 
*tool,
                event->mmap2.pid = tgid;
                event->mmap2.tid = pid;
 
+               if (symbol_conf.buildid_mmap2)
+                       perf_record_mmap2__read_build_id(&event->mmap2, false);
+
                if (perf_tool__process_synth_event(tool, event, machine, 
process) != 0) {
                        rc = -1;
                        break;
@@ -630,6 +658,8 @@ int perf_event__synthesize_modules(struct perf_tool *tool, 
perf_event__handler_t
 
                        memcpy(event->mmap2.filename, pos->dso->long_name,
                               pos->dso->long_name_len + 1);
+
+                       perf_record_mmap2__read_build_id(&event->mmap2, false);
                } else {
                        size = PERF_ALIGN(pos->dso->long_name_len + 1, 
sizeof(u64));
                        event->mmap.header.type = PERF_RECORD_MMAP;
@@ -1050,6 +1080,8 @@ static int __perf_event__synthesize_kernel_mmap(struct 
perf_tool *tool,
                event->mmap2.start = map->start;
                event->mmap2.len   = map->end - event->mmap.start;
                event->mmap2.pid   = machine->pid;
+
+               perf_record_mmap2__read_build_id(&event->mmap2, true);
        } else {
                size = snprintf(event->mmap.filename, 
sizeof(event->mmap.filename),
                                "%s%s", machine->mmap_name, 
kmap->ref_reloc_sym->name) + 1;
-- 
2.26.2