[tip:perfcounters/core] perf report: Print more expressive message in case of file open error

[tip-bot for Ingo Molnar]

Commit-ID:  a14832ff977e78d1982cdf78cdabb1f2320d9ac8
Gitweb:     http://git.kernel.org/tip/a14832ff977e78d1982cdf78cdabb1f2320d9ac8
Author:     Ingo Molnar <mingo@xxxxxxx>
AuthorDate: Sun, 7 Jun 2009 17:58:23 +0200
Committer:  Ingo Molnar <mingo@xxxxxxx>
CommitDate: Sun, 7 Jun 2009 17:58:23 +0200

perf report: Print more expressive message in case of file open error

Before:

 $ perf report
 failed to open file: No such file or directory

After:

 $ perf report
  failed to open file: perf.data  (try 'perf record' first)

Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>


---
 tools/perf/builtin-report.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 242e09f..f053a74 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -1120,7 +1120,10 @@ static int __cmd_report(void)
 
 	input = open(input_name, O_RDONLY);
 	if (input < 0) {
-		perror("failed to open file");
+		fprintf(stderr, " failed to open file: %s", input_name);
+		if (!strcmp(input_name, "perf.data"))
+			fprintf(stderr, "  (try 'perf record' first)");
+		fprintf(stderr, "\n");
 		exit(-1);
 	}
 
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