diff mbox series

[v3,1/1] perf cs-etm: Add warnings for missing DSOs

Message ID 20210805130354.878120-2-james.clark@arm.com (mailing list archive)
State New, archived
Headers show
Series perf tools: Warning fixes | expand

Commit Message

James Clark Aug. 5, 2021, 1:03 p.m. UTC 
Currently decode will silently fail if no binary data is available for
the decode. This is made worse if only partial data is available because
the decode will appear to work, but any trace from that missing DSO will
silently not be generated.

Add a UI popup once if there is any data missing, and then warn in the
bottom left for each individual DSO that's missing.

Reviewed-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: James Clark <james.clark@arm.com>
---
 tools/perf/util/cs-etm.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

Comments

Arnaldo Carvalho de Melo Aug. 6, 2021, 6:39 p.m. UTC | #1 
Em Thu, Aug 05, 2021 at 02:03:54PM +0100, James Clark escreveu:
> Currently decode will silently fail if no binary data is available for
> the decode. This is made worse if only partial data is available because
> the decode will appear to work, but any trace from that missing DSO will
> silently not be generated.
> 
> Add a UI popup once if there is any data missing, and then warn in the
> bottom left for each individual DSO that's missing.
> 
> Reviewed-by: Leo Yan <leo.yan@linaro.org>
> Signed-off-by: James Clark <james.clark@arm.com>

Thanks, applied.

- Arnaldo
diff mbox series

Patch

diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
index f4b2bff533f3..b59d234e437d 100644
--- a/tools/perf/util/cs-etm.c
+++ b/tools/perf/util/cs-etm.c
@@ -716,8 +716,17 @@  static u32 cs_etm__mem_access(struct cs_etm_queue *etmq, u8 trace_chan_id,
 
 	len = dso__data_read_offset(al.map->dso, machine, offset, buffer, size);
 
-	if (len <= 0)
+	if (len <= 0) {
+		ui__warning_once("CS ETM Trace: Missing DSO. Use 'perf archive' or debuginfod to export data from the traced system.\n"
+				 "              Enable CONFIG_PROC_KCORE or use option '-k /path/to/vmlinux' for kernel symbols.\n");
+		if (!al.map->dso->auxtrace_warned) {
+			pr_err("CS ETM Trace: Debug data not found for address %#"PRIx64" in %s\n",
+				    address,
+				    al.map->dso->long_name ? al.map->dso->long_name : "Unknown");
+			al.map->dso->auxtrace_warned = true;
+		}
 		return 0;
+	}
 
 	return len;
 }