perf evlist: Switch to libperf's mmap interface

Switch to the libperf mmap interface by calling directly
perf_evlist__mmap_ops() and removing perf's evlist__mmap_per_*
functions.

By switching to libperf perf_evlist__mmap() we need to operate over
'struct perf_mmap' in evlist__add_pollfd, so make the related changes
there.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20191007125344.14268-22-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index d57b684..3f4f11f 100644 (file)
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -431,10 +431,10 @@ int evlist__add_pollfd(struct evlist *evlist, int fd)
 static void perf_evlist__munmap_filtered(struct fdarray *fda, int fd,
                                         void *arg __maybe_unused)
 {
-       struct mmap *map = fda->priv[fd].ptr;
+       struct perf_mmap *map = fda->priv[fd].ptr;
 
        if (map)
-               perf_mmap__put(&map->core);
+               perf_mmap__put(map);
 }
 
 int evlist__filter_pollfd(struct evlist *evlist, short revents_and_mask)
@@ -448,22 +448,6 @@ int evlist__poll(struct evlist *evlist, int timeout)
        return perf_evlist__poll(&evlist->core, timeout);
 }
 
-static void perf_evlist__set_sid_idx(struct evlist *evlist,
-                                    struct evsel *evsel, int idx, int cpu,
-                                    int thread)
-{
-       struct perf_sample_id *sid = SID(evsel, cpu, thread);
-       sid->idx = idx;
-       if (evlist->core.cpus && cpu >= 0)
-               sid->cpu = evlist->core.cpus->map[cpu];
-       else
-               sid->cpu = -1;
-       if (!evsel->core.system_wide && evlist->core.threads && thread >= 0)
-               sid->tid = perf_thread_map__pid(evlist->core.threads, thread);
-       else
-               sid->tid = -1;
-}
-
 struct perf_sample_id *perf_evlist__id2sid(struct evlist *evlist, u64 id)
 {
        struct hlist_head *head;
@@ -652,93 +636,6 @@ static struct mmap *evlist__alloc_mmap(struct evlist *evlist,
        return map;
 }
 
-static bool
-perf_evlist__should_poll(struct evlist *evlist __maybe_unused,
-                        struct evsel *evsel)
-{
-       if (evsel->core.attr.write_backward)
-               return false;
-       return true;
-}
-
-static int evlist__mmap_per_evsel(struct evlist *evlist, int idx,
-                                      struct mmap_params *mp, int cpu_idx,
-                                      int thread, int *_output, int *_output_overwrite)
-{
-       struct evsel *evsel;
-       int revent;
-       int evlist_cpu = cpu_map__cpu(evlist->core.cpus, cpu_idx);
-
-       evlist__for_each_entry(evlist, evsel) {
-               struct mmap *maps = evlist->mmap;
-               int *output = _output;
-               int fd;
-               int cpu;
-
-               mp->core.prot = PROT_READ | PROT_WRITE;
-               if (evsel->core.attr.write_backward) {
-                       output = _output_overwrite;
-                       maps = evlist->overwrite_mmap;
-
-                       if (!maps) {
-                               maps = evlist__alloc_mmap(evlist, true);
-                               if (!maps)
-                                       return -1;
-                               evlist->overwrite_mmap = maps;
-                               if (evlist->bkw_mmap_state == BKW_MMAP_NOTREADY)
-                                       perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_RUNNING);
-                       }
-                       mp->core.prot &= ~PROT_WRITE;
-               }
-
-               if (evsel->core.system_wide && thread)
-                       continue;
-
-               cpu = perf_cpu_map__idx(evsel->core.cpus, evlist_cpu);
-               if (cpu == -1)
-                       continue;
-
-               fd = FD(evsel, cpu, thread);
-
-               if (*output == -1) {
-                       *output = fd;
-
-                       if (mmap__mmap(&maps[idx], mp, *output, evlist_cpu) < 0)
-                               return -1;
-               } else {
-                       if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0)
-                               return -1;
-
-                       perf_mmap__get(&maps[idx].core);
-               }
-
-               revent = perf_evlist__should_poll(evlist, evsel) ? POLLIN : 0;
-
-               /*
-                * The system_wide flag causes a selected event to be opened
-                * always without a pid.  Consequently it will never get a
-                * POLLHUP, but it is used for tracking in combination with
-                * other events, so it should not need to be polled anyway.
-                * Therefore don't add it for polling.
-                */
-               if (!evsel->core.system_wide &&
-                    perf_evlist__add_pollfd(&evlist->core, fd, &maps[idx], revent) < 0) {
-                       perf_mmap__put(&maps[idx].core);
-                       return -1;
-               }
-
-               if (evsel->core.attr.read_format & PERF_FORMAT_ID) {
-                       if (perf_evlist__id_add_fd(&evlist->core, &evsel->core, cpu, thread,
-                                                  fd) < 0)
-                               return -1;
-                       perf_evlist__set_sid_idx(evlist, evsel, idx, cpu,
-                                                thread);
-               }
-       }
-
-       return 0;
-}
-
 static void
 perf_evlist__mmap_cb_idx(struct perf_evlist *_evlist,
                         struct perf_mmap_param *_mp,
@@ -783,61 +680,6 @@ perf_evlist__mmap_cb_mmap(struct perf_mmap *_map, struct perf_mmap_param *_mp,
        return mmap__mmap(map, mp, output, cpu);
 }
 
-static int evlist__mmap_per_cpu(struct evlist *evlist,
-                                    struct mmap_params *mp)
-{
-       int cpu, thread;
-       int nr_cpus = perf_cpu_map__nr(evlist->core.cpus);
-       int nr_threads = perf_thread_map__nr(evlist->core.threads);
-
-       pr_debug2("perf event ring buffer mmapped per cpu\n");
-       for (cpu = 0; cpu < nr_cpus; cpu++) {
-               int output = -1;
-               int output_overwrite = -1;
-
-               auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, cpu,
-                                             true);
-
-               for (thread = 0; thread < nr_threads; thread++) {
-                       if (evlist__mmap_per_evsel(evlist, cpu, mp, cpu,
-                                                       thread, &output, &output_overwrite))
-                               goto out_unmap;
-               }
-       }
-
-       return 0;
-
-out_unmap:
-       evlist__munmap_nofree(evlist);
-       return -1;
-}
-
-static int evlist__mmap_per_thread(struct evlist *evlist,
-                                       struct mmap_params *mp)
-{
-       int thread;
-       int nr_threads = perf_thread_map__nr(evlist->core.threads);
-
-       pr_debug2("perf event ring buffer mmapped per thread\n");
-       for (thread = 0; thread < nr_threads; thread++) {
-               int output = -1;
-               int output_overwrite = -1;
-
-               auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, thread,
-                                             false);
-
-               if (evlist__mmap_per_evsel(evlist, thread, mp, 0, thread,
-                                               &output, &output_overwrite))
-                       goto out_unmap;
-       }
-
-       return 0;
-
-out_unmap:
-       evlist__munmap_nofree(evlist);
-       return -1;
-}
-
 unsigned long perf_event_mlock_kb_in_pages(void)
 {
        unsigned long pages;
@@ -965,9 +807,6 @@ int evlist__mmap_ex(struct evlist *evlist, unsigned int pages,
                         bool auxtrace_overwrite, int nr_cblocks, int affinity, int flush,
                         int comp_level)
 {
-       struct evsel *evsel;
-       const struct perf_cpu_map *cpus = evlist->core.cpus;
-       const struct perf_thread_map *threads = evlist->core.threads;
        /*
         * Delay setting mp.prot: set it before calling perf_mmap__mmap.
         * Its value is decided by evsel's write_backward.
@@ -979,7 +818,7 @@ int evlist__mmap_ex(struct evlist *evlist, unsigned int pages,
                .flush          = flush,
                .comp_level     = comp_level
        };
-       struct perf_evlist_mmap_ops ops __maybe_unused = {
+       struct perf_evlist_mmap_ops ops = {
                .idx  = perf_evlist__mmap_cb_idx,
                .get  = perf_evlist__mmap_cb_get,
                .mmap = perf_evlist__mmap_cb_mmap,
@@ -1000,17 +839,7 @@ int evlist__mmap_ex(struct evlist *evlist, unsigned int pages,
        auxtrace_mmap_params__init(&mp.auxtrace_mp, evlist->core.mmap_len,
                                   auxtrace_pages, auxtrace_overwrite);
 
-       evlist__for_each_entry(evlist, evsel) {
-               if ((evsel->core.attr.read_format & PERF_FORMAT_ID) &&
-                   evsel->core.sample_id == NULL &&
-                   perf_evsel__alloc_id(&evsel->core, perf_cpu_map__nr(cpus), threads->nr) < 0)
-                       return -ENOMEM;
-       }
-
-       if (perf_cpu_map__empty(cpus))
-               return evlist__mmap_per_thread(evlist, &mp);
-
-       return evlist__mmap_per_cpu(evlist, &mp);
+       return perf_evlist__mmap_ops(&evlist->core, &ops, &mp.core);
 }
 
 int evlist__mmap(struct evlist *evlist, unsigned int pages)