From: Wang Nan Date: Thu, 14 Jul 2016 08:34:40 +0000 (+0000) Subject: perf evlist: Map backward events to backward_mmap X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=078c33862e042b3778dce3bcc8eaef84ab40715c;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git perf evlist: Map backward events to backward_mmap In perf_evlist__mmap_per_evsel(), select backward_mmap for backward events. Utilize new perf_mmap APIs. Dynamically alloc backward_mmap. Remove useless functions. Signed-off-by: Wang Nan Acked-by: Jiri Olsa Cc: He Kuang Cc: Masami Hiramatsu Cc: Namhyung Kim Cc: Nilay Vaish Cc: Zefan Li Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1468485287-33422-9-git-send-email-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo --- diff --git a/tools/perf/tests/backward-ring-buffer.c b/tools/perf/tests/backward-ring-buffer.c index 5cee3873f2b5..b2c634815f6b 100644 --- a/tools/perf/tests/backward-ring-buffer.c +++ b/tools/perf/tests/backward-ring-buffer.c @@ -31,8 +31,8 @@ static int count_samples(struct perf_evlist *evlist, int *sample_count, for (i = 0; i < evlist->nr_mmaps; i++) { union perf_event *event; - perf_evlist__mmap_read_catchup(evlist, i); - while ((event = perf_evlist__mmap_read_backward(evlist, i)) != NULL) { + perf_mmap__read_catchup(&evlist->backward_mmap[i]); + while ((event = perf_mmap__read_backward(&evlist->backward_mmap[i])) != NULL) { const u32 type = event->header.type; switch (type) { diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index 24927e111d17..7570f903200e 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -27,7 +27,6 @@ #include #include -static void perf_evlist__mmap_put(struct perf_evlist *evlist, int idx); static void perf_mmap__munmap(struct perf_mmap *map); static void perf_mmap__put(struct perf_mmap *map); @@ -692,8 +691,11 @@ static int perf_evlist__set_paused(struct perf_evlist *evlist, bool value) { int i; + if (!evlist->backward_mmap) + return 0; + for (i = 0; i < evlist->nr_mmaps; i++) { - int fd = evlist->mmap[i].fd; + int fd = evlist->backward_mmap[i].fd; int err; if (fd < 0) @@ -904,16 +906,6 @@ static void perf_mmap__put(struct perf_mmap *md) perf_mmap__munmap(md); } -static void perf_evlist__mmap_get(struct perf_evlist *evlist, int idx) -{ - perf_mmap__get(&evlist->mmap[idx]); -} - -static void perf_evlist__mmap_put(struct perf_evlist *evlist, int idx) -{ - perf_mmap__put(&evlist->mmap[idx]); -} - void perf_mmap__consume(struct perf_mmap *md, bool overwrite) { if (!overwrite) { @@ -1049,12 +1041,6 @@ static int perf_mmap__mmap(struct perf_mmap *map, return 0; } -static int __perf_evlist__mmap(struct perf_evlist *evlist, int idx, - struct mmap_params *mp, int fd) -{ - return perf_mmap__mmap(&evlist->mmap[idx], mp, fd); -} - static bool perf_evlist__should_poll(struct perf_evlist *evlist __maybe_unused, struct perf_evsel *evsel) @@ -1066,16 +1052,27 @@ perf_evlist__should_poll(struct perf_evlist *evlist __maybe_unused, static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx, struct mmap_params *mp, int cpu, - int thread, int *output) + int thread, int *_output, int *_output_backward) { struct perf_evsel *evsel; int revent; evlist__for_each_entry(evlist, evsel) { + struct perf_mmap *maps = evlist->mmap; + int *output = _output; int fd; - if (!!evsel->attr.write_backward != (evlist->overwrite && evlist->backward)) - continue; + if (evsel->attr.write_backward) { + output = _output_backward; + maps = evlist->backward_mmap; + + if (!maps) { + maps = perf_evlist__alloc_mmap(evlist); + if (!maps) + return -1; + evlist->backward_mmap = maps; + } + } if (evsel->system_wide && thread) continue; @@ -1084,13 +1081,14 @@ static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx, if (*output == -1) { *output = fd; - if (__perf_evlist__mmap(evlist, idx, mp, *output) < 0) + + if (perf_mmap__mmap(&maps[idx], mp, *output) < 0) return -1; } else { if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0) return -1; - perf_evlist__mmap_get(evlist, idx); + perf_mmap__get(&maps[idx]); } revent = perf_evlist__should_poll(evlist, evsel) ? POLLIN : 0; @@ -1103,8 +1101,8 @@ static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx, * Therefore don't add it for polling. */ if (!evsel->system_wide && - __perf_evlist__add_pollfd(evlist, fd, &evlist->mmap[idx], revent) < 0) { - perf_evlist__mmap_put(evlist, idx); + __perf_evlist__add_pollfd(evlist, fd, &maps[idx], revent) < 0) { + perf_mmap__put(&maps[idx]); return -1; } @@ -1130,13 +1128,14 @@ static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, pr_debug2("perf event ring buffer mmapped per cpu\n"); for (cpu = 0; cpu < nr_cpus; cpu++) { int output = -1; + int output_backward = -1; auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, cpu, true); for (thread = 0; thread < nr_threads; thread++) { if (perf_evlist__mmap_per_evsel(evlist, cpu, mp, cpu, - thread, &output)) + thread, &output, &output_backward)) goto out_unmap; } } @@ -1157,12 +1156,13 @@ static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, pr_debug2("perf event ring buffer mmapped per thread\n"); for (thread = 0; thread < nr_threads; thread++) { int output = -1; + int output_backward = -1; auxtrace_mmap_params__set_idx(&mp->auxtrace_mp, evlist, thread, false); if (perf_evlist__mmap_per_evsel(evlist, thread, mp, 0, thread, - &output)) + &output, &output_backward)) goto out_unmap; }