perf tools: Allow handling a NULL cpu_map as meaning "all cpus"

Or one with cpu_map->map[0] == -1.

Reducing the boilerplate in setting up an evlist by nor requiring a
cpu_map to be created at all.

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: Namhyung Kim <namhyung@gmail.com>
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-rnaqn3dtnsfo1wlbbf3fhx00@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 17 insertions, 6 deletions

diff --git a/tools/perf/util/cpumap.h b/tools/perf/util/cpumap.h
index 17b5264f6436..2f68a3b8c285 100644
--- a/tools/perf/util/cpumap.h
+++ b/tools/perf/util/cpumap.h
@@ -2,6 +2,7 @@
 #define __PERF_CPUMAP_H
 
 #include <stdio.h>
+#include <stdbool.h>
 
 struct cpu_map {
         int nr;
@@ -14,4 +15,14 @@ void cpu_map__delete(struct cpu_map *map);
 struct cpu_map *cpu_map__read(FILE *file);
 size_t cpu_map__fprintf(struct cpu_map *map, FILE *fp);
 
+static inline int cpu_map__nr(const struct cpu_map *map)
+{
+        return map ? map->nr : 1;
+}
+
+static inline bool cpu_map__all(const struct cpu_map *map)
+{
+        return map ? map->map[0] == -1 : true;
+}
+
 #endif /* __PERF_CPUMAP_H */
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 892353729c7a..27f6de3aab16 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -304,7 +304,7 @@ void perf_evlist__enable(struct perf_evlist *evlist)
         int cpu, thread;
         struct perf_evsel *pos;
 
-        for (cpu = 0; cpu < evlist->cpus->nr; cpu++) {
+        for (cpu = 0; cpu < cpu_map__nr(evlist->cpus); cpu++) {
                 list_for_each_entry(pos, &evlist->entries, node) {
                         for (thread = 0; thread < evlist->threads->nr; thread++)
                                 ioctl(FD(pos, cpu, thread),
@@ -315,7 +315,7 @@ void perf_evlist__enable(struct perf_evlist *evlist)
 
 static int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
 {
-        int nfds = evlist->cpus->nr * evlist->threads->nr * evlist->nr_entries;
+        int nfds = cpu_map__nr(evlist->cpus) * evlist->threads->nr * evlist->nr_entries;
         evlist->pollfd = malloc(sizeof(struct pollfd) * nfds);
         return evlist->pollfd != NULL ? 0 : -ENOMEM;
 }
@@ -475,8 +475,8 @@ void perf_evlist__munmap(struct perf_evlist *evlist)
 
 static int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
 {
-        evlist->nr_mmaps = evlist->cpus->nr;
-        if (evlist->cpus->map[0] == -1)
+        evlist->nr_mmaps = cpu_map__nr(evlist->cpus);
+        if (cpu_map__all(evlist->cpus))
                 evlist->nr_mmaps = evlist->threads->nr;
         evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
         return evlist->mmap != NULL ? 0 : -ENOMEM;
@@ -622,11 +622,11 @@ int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
         list_for_each_entry(evsel, &evlist->entries, node) {
                 if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
                     evsel->sample_id == NULL &&
-                    perf_evsel__alloc_id(evsel, cpus->nr, threads->nr) < 0)
+                    perf_evsel__alloc_id(evsel, cpu_map__nr(cpus), threads->nr) < 0)
                         return -ENOMEM;
         }
 
-        if (evlist->cpus->map[0] == -1)
+        if (cpu_map__all(cpus))
                 return perf_evlist__mmap_per_thread(evlist, prot, mask);
 
         return perf_evlist__mmap_per_cpu(evlist, prot, mask);