linux-kernel - [PATCH 11/12] perf, tools: Print probe warnings for binaries only once per binary

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Date:   Mon, 27 Nov 2017 16:23:20 -0800
From:   Andi Kleen <andi@...stfloor.org>
To:     acme@...nel.org
Cc:     jolsa@...nel.org, mhiramat@...nel.org, adrian.hunter@...el.com,
        linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 11/12] perf, tools: Print probe warnings for binaries only once per binary

From: Andi Kleen <ak@...ux.intel.com>

When the perf probe code is called from perf script we may end up
with a flood of bad binary errors with -v. Only print the error message
once in this case.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 tools/perf/util/probe-event.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index fb5031ac24a2..85fbeeb364bf 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -492,12 +492,16 @@ static struct debuginfo *open_debuginfo(const char *module, struct nsinfo *nsi,
 	nsinfo__mountns_enter(nsi, &nsc);
 	ret = debuginfo__new(path);
 	if (!ret && (!silent || verbose)) {
-		pr_warning("The %s file has no debug information.\n", path);
-		if (!module || !strtailcmp(path, ".ko"))
-			pr_warning("Rebuild with CONFIG_DEBUG_INFO=y, ");
-		else
-			pr_warning("Rebuild with -g, ");
-		pr_warning("or install an appropriate debuginfo package.\n");
+		static char printed[1024];
+		if (strcmp(path, printed)) {
+			snprintf(printed, sizeof printed, "%s", path);
+			pr_warning("The %s file has no debug information.\n", path);
+			if (!module || !strtailcmp(path, ".ko"))
+				pr_warning("Rebuild with CONFIG_DEBUG_INFO=y, ");
+			else
+				pr_warning("Rebuild with -g, ");
+			pr_warning("or install an appropriate debuginfo package.\n");
+		}
 	}
 	nsinfo__mountns_exit(&nsc);
 	return ret;
-- 
2.13.6