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>
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@ -298,7 +298,22 @@ static struct syscall *trace__syscall_info(struct trace *trace,
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int id = perf_evsel__intval(evsel, sample, "id");
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if (id < 0) {
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fprintf(trace->output, "Invalid syscall %d id, skipping...\n", id);
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/*
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* XXX: Noticed on x86_64, reproduced as far back as 3.0.36, haven't tried
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* before that, leaving at a higher verbosity level till that is
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* explained. Reproduced with plain ftrace with:
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*
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* echo 1 > /t/events/raw_syscalls/sys_exit/enable
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* grep "NR -1 " /t/trace_pipe
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*
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* After generating some load on the machine.
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*/
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if (verbose > 1) {
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static u64 n;
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fprintf(trace->output, "Invalid syscall %d id, skipping (%s, %" PRIu64 ") ...\n",
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id, perf_evsel__name(evsel), ++n);
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}
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return NULL;
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}
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