perf machine: Introduce synthesize_threads method out of open coded equivalent

Further simplifications to be done on following patch, as most tools
don't use the callback, using instead just the canned
machine__process_event one.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.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-r1m0vuuj3cat4bampno9yc8d@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-kvm.c

@@ -1544,18 +1544,9 @@ static int kvm_events_live(struct perf_kvm_stat *kvm,
 	}
 	kvm->session->evlist = kvm->evlist;
 	perf_session__set_id_hdr_size(kvm->session);
-
+	machine__synthesize_threads(&kvm->session->machines.host, &kvm->tool,
-
+				    &kvm->opts.target, kvm->evlist->threads,
-	if (perf_target__has_task(&kvm->opts.target))
+				    perf_event__process, false);
-		perf_event__synthesize_thread_map(&kvm->tool,
-						  kvm->evlist->threads,
-						  perf_event__process,
-						  &kvm->session->machines.host, false);
-	else
-		perf_event__synthesize_threads(&kvm->tool, perf_event__process,
-					       &kvm->session->machines.host, false);
-
-
 	err = kvm_live_open_events(kvm);
 	if (err)
 		goto out;

tools/perf/builtin-record.c

@@ -480,16 +480,8 @@ static int __cmd_record(struct perf_record *rec, int argc, const char **argv)
 					 perf_event__synthesize_guest_os, tool);
 	}
 
-	if (perf_target__has_task(&opts->target))
+	err = machine__synthesize_threads(machine, tool, &opts->target, evsel_list->threads,
-		err = perf_event__synthesize_thread_map(tool, evsel_list->threads,
+					  process_synthesized_event, opts->sample_address);
-							process_synthesized_event,
-							machine, opts->sample_address);
-	else if (perf_target__has_cpu(&opts->target))
-		err = perf_event__synthesize_threads(tool, process_synthesized_event,
-						     machine, opts->sample_address);
-	else /* command specified */
-		err = 0;
-
 	if (err != 0)
 		goto out_delete_session;
 

tools/perf/builtin-top.c

@@ -950,14 +950,9 @@ static int __cmd_top(struct perf_top *top)
 	if (ret)
 		goto out_delete;
 
-	if (perf_target__has_task(&opts->target))
+	machine__synthesize_threads(&top->session->machines.host, &top->tool,
-		perf_event__synthesize_thread_map(&top->tool, top->evlist->threads,
+				    &opts->target, top->evlist->threads,
-						  perf_event__process,
+				    perf_event__process, false);
-						  &top->session->machines.host, false);
-	else
-		perf_event__synthesize_threads(&top->tool, perf_event__process,
-					       &top->session->machines.host, false);
-
 	ret = perf_top__start_counters(top);
 	if (ret)
 		goto out_delete;

tools/perf/builtin-trace.c

@@ -1340,15 +1340,8 @@ static int trace__symbols_init(struct trace *trace, struct perf_evlist *evlist)
 	if (trace->host == NULL)
 		return -ENOMEM;
 
-	if (perf_target__has_task(&trace->opts.target)) {
+	err = machine__synthesize_threads(trace->host, &trace->tool, &trace->opts.target,
-		err = perf_event__synthesize_thread_map(&trace->tool, evlist->threads,
+					  evlist->threads, trace__tool_process, false);
-							trace__tool_process,
-							trace->host, false);
-	} else {
-		err = perf_event__synthesize_threads(&trace->tool, trace__tool_process,
-						     trace->host, false);
-	}
-
 	if (err)
 		symbol__exit();
 

tools/perf/util/machine.c

@@ -1394,3 +1394,15 @@ int machine__for_each_thread(struct machine *machine,
 	}
 	return rc;
 }
+
+int machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
+				struct perf_target *target, struct thread_map *threads,
+				perf_event__handler_t process, bool data_mmap)
+{
+	if (perf_target__has_task(target))
+		return perf_event__synthesize_thread_map(tool, threads, process, machine, data_mmap);
+	else if (perf_target__has_cpu(target))
+		return perf_event__synthesize_threads(tool, process, machine, data_mmap);
+	/* command specified */
+	return 0;
+}

tools/perf/util/machine.h

@@ -4,6 +4,7 @@
 #include <sys/types.h>
 #include <linux/rbtree.h>
 #include "map.h"
+#include "event.h"
 
 struct addr_location;
 struct branch_stack;
@@ -178,4 +179,7 @@ int machine__for_each_thread(struct machine *machine,
 			     int (*fn)(struct thread *thread, void *p),
 			     void *priv);
 
+int machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
+				struct perf_target *target, struct thread_map *threads,
+				perf_event__handler_t process, bool data_mmap);
 #endif /* __PERF_MACHINE_H */