perf trace: Support ! in -e expressions
So that we can ask for all but a set of syscalls to be traced. 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-9j6hvap23qanyl96wx4mrj9k@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -30,6 +30,8 @@ OPTIONS
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-e::
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--expr::
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List of events to show, currently only syscall names.
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Prefixing with ! shows all syscalls but the ones specified. You may
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need to escape it.
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-o::
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--output=::
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@ -114,8 +114,9 @@ struct trace {
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struct machine host;
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u64 base_time;
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FILE *output;
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struct strlist *ev_qualifier;
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unsigned long nr_events;
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struct strlist *ev_qualifier;
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bool not_ev_qualifier;
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bool sched;
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bool multiple_threads;
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double duration_filter;
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@ -234,13 +235,17 @@ static int trace__read_syscall_info(struct trace *trace, int id)
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sc = trace->syscalls.table + id;
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sc->name = name;
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if (trace->ev_qualifier && !strlist__find(trace->ev_qualifier, name)) {
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sc->filtered = true;
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/*
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* No need to do read tracepoint information since this will be
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* filtered out.
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*/
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return 0;
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if (trace->ev_qualifier) {
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bool in = strlist__find(trace->ev_qualifier, name) != NULL;
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if (!(in ^ trace->not_ev_qualifier)) {
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sc->filtered = true;
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/*
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* No need to do read tracepoint information since this will be
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* filtered out.
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*/
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return 0;
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}
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}
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sc->fmt = syscall_fmt__find(sc->name);
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@ -725,7 +730,12 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
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}
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if (ev_qualifier_str != NULL) {
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trace.ev_qualifier = strlist__new(true, ev_qualifier_str);
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const char *s = ev_qualifier_str;
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trace.not_ev_qualifier = *s == '!';
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if (trace.not_ev_qualifier)
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++s;
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trace.ev_qualifier = strlist__new(true, s);
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if (trace.ev_qualifier == NULL) {
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fputs("Not enough memory to parse event qualifier",
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trace.output);
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