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authorArnaldo Carvalho de Melo <acme@redhat.com>2013-08-22 17:55:25 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2013-08-26 17:25:45 -0300
commitadaa18bf5d9128c4a34f5350b1d46555a949ebc4 (patch)
treee696206f823898094ed4cfde15140217d915899e /tools
parent7c304ee0fc66b4c21282e1cce32631c263f8c481 (diff)
downloadlinux-adaa18bf5d9128c4a34f5350b1d46555a949ebc4.tar.bz2
perf trace: Hide sys_exit messages about syscall id = -1
That was reproduced via ftrace as described in this cset comment log, need to investigate further. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-n1i3m0vo6mgq3ddjj95sls2s@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/builtin-trace.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index c907e7e41a74..c3caabbe18fa 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -298,7 +298,22 @@ static struct syscall *trace__syscall_info(struct trace *trace,
int id = perf_evsel__intval(evsel, sample, "id");
if (id < 0) {
- fprintf(trace->output, "Invalid syscall %d id, skipping...\n", id);
+
+ /*
+ * XXX: Noticed on x86_64, reproduced as far back as 3.0.36, haven't tried
+ * before that, leaving at a higher verbosity level till that is
+ * explained. Reproduced with plain ftrace with:
+ *
+ * echo 1 > /t/events/raw_syscalls/sys_exit/enable
+ * grep "NR -1 " /t/trace_pipe
+ *
+ * After generating some load on the machine.
+ */
+ if (verbose > 1) {
+ static u64 n;
+ fprintf(trace->output, "Invalid syscall %d id, skipping (%s, %" PRIu64 ") ...\n",
+ id, perf_evsel__name(evsel), ++n);
+ }
return NULL;
}