From d21fc5f077f7760bbae5742e185691718518f255 Mon Sep 17 00:00:00 2001 From: Riccardo Mancini Date: Sat, 21 Aug 2021 11:19:25 +0200 Subject: [PATCH] perf evsel: Separate missing feature detection from evsel__open_cpu() This is a preparatory patch for the workqueue patches with the goal to separate in evlist__open_cpu() the actual opening, which could be performed in parallel, from the existing fallback mechanisms, which should be handled sequentially. This patch separates the missing feature detection in evsel__open_cpu() into a new evsel__detect_missing_features() function. Signed-off-by: Riccardo Mancini Cc: Ian Rogers Cc: Jiri Olsa Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lore.kernel.org/lkml/cba0b7d939862473662adeedb0f9c9b69566ee9a.1629490974.git.rickyman7@gmail.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/evsel.c | 174 +++++++++++++++++++++------------------- tools/perf/util/evsel.h | 1 + 2 files changed, 92 insertions(+), 83 deletions(-) diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index 45d778f063d47..943ddea9b1f4b 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -1841,6 +1841,96 @@ int evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus, return err; } +bool evsel__detect_missing_features(struct evsel *evsel) +{ + /* + * Must probe features in the order they were added to the + * perf_event_attr interface. + */ + if (!perf_missing_features.weight_struct && + (evsel->core.attr.sample_type & PERF_SAMPLE_WEIGHT_STRUCT)) { + perf_missing_features.weight_struct = true; + pr_debug2("switching off weight struct support\n"); + return true; + } else if (!perf_missing_features.code_page_size && + (evsel->core.attr.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE)) { + perf_missing_features.code_page_size = true; + pr_debug2_peo("Kernel has no PERF_SAMPLE_CODE_PAGE_SIZE support, bailing out\n"); + return false; + } else if (!perf_missing_features.data_page_size && + (evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE)) { + perf_missing_features.data_page_size = true; + pr_debug2_peo("Kernel has no PERF_SAMPLE_DATA_PAGE_SIZE support, bailing out\n"); + return false; + } else if (!perf_missing_features.cgroup && evsel->core.attr.cgroup) { + perf_missing_features.cgroup = true; + pr_debug2_peo("Kernel has no cgroup sampling support, bailing out\n"); + return false; + } else if (!perf_missing_features.branch_hw_idx && + (evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_HW_INDEX)) { + perf_missing_features.branch_hw_idx = true; + pr_debug2("switching off branch HW index support\n"); + return true; + } else if (!perf_missing_features.aux_output && evsel->core.attr.aux_output) { + perf_missing_features.aux_output = true; + pr_debug2_peo("Kernel has no attr.aux_output support, bailing out\n"); + return false; + } else if (!perf_missing_features.bpf && evsel->core.attr.bpf_event) { + perf_missing_features.bpf = true; + pr_debug2_peo("switching off bpf_event\n"); + return true; + } else if (!perf_missing_features.ksymbol && evsel->core.attr.ksymbol) { + perf_missing_features.ksymbol = true; + pr_debug2_peo("switching off ksymbol\n"); + return true; + } else if (!perf_missing_features.write_backward && evsel->core.attr.write_backward) { + perf_missing_features.write_backward = true; + pr_debug2_peo("switching off write_backward\n"); + return false; + } else if (!perf_missing_features.clockid_wrong && evsel->core.attr.use_clockid) { + perf_missing_features.clockid_wrong = true; + pr_debug2_peo("switching off clockid\n"); + return true; + } else if (!perf_missing_features.clockid && evsel->core.attr.use_clockid) { + perf_missing_features.clockid = true; + pr_debug2_peo("switching off use_clockid\n"); + return true; + } else if (!perf_missing_features.cloexec && (evsel->open_flags & PERF_FLAG_FD_CLOEXEC)) { + perf_missing_features.cloexec = true; + pr_debug2_peo("switching off cloexec flag\n"); + return true; + } else if (!perf_missing_features.mmap2 && evsel->core.attr.mmap2) { + perf_missing_features.mmap2 = true; + pr_debug2_peo("switching off mmap2\n"); + return true; + } else if (!perf_missing_features.exclude_guest && + (evsel->core.attr.exclude_guest || evsel->core.attr.exclude_host)) { + perf_missing_features.exclude_guest = true; + pr_debug2_peo("switching off exclude_guest, exclude_host\n"); + return true; + } else if (!perf_missing_features.sample_id_all) { + perf_missing_features.sample_id_all = true; + pr_debug2_peo("switching off sample_id_all\n"); + return true; + } else if (!perf_missing_features.lbr_flags && + (evsel->core.attr.branch_sample_type & + (PERF_SAMPLE_BRANCH_NO_CYCLES | + PERF_SAMPLE_BRANCH_NO_FLAGS))) { + perf_missing_features.lbr_flags = true; + pr_debug2_peo("switching off branch sample type no (cycles/flags)\n"); + return true; + } else if (!perf_missing_features.group_read && + evsel->core.attr.inherit && + (evsel->core.attr.read_format & PERF_FORMAT_GROUP) && + evsel__is_group_leader(evsel)) { + perf_missing_features.group_read = true; + pr_debug2_peo("switching off group read\n"); + return true; + } else { + return false; + } +} + static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, struct perf_thread_map *threads, int start_cpu, int end_cpu) @@ -1979,90 +2069,8 @@ try_fallback: if (err != -EINVAL || cpu > 0 || thread > 0) goto out_close; - /* - * Must probe features in the order they were added to the - * perf_event_attr interface. - */ - if (!perf_missing_features.weight_struct && - (evsel->core.attr.sample_type & PERF_SAMPLE_WEIGHT_STRUCT)) { - perf_missing_features.weight_struct = true; - pr_debug2("switching off weight struct support\n"); + if (evsel__detect_missing_features(evsel)) goto fallback_missing_features; - } else if (!perf_missing_features.code_page_size && - (evsel->core.attr.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE)) { - perf_missing_features.code_page_size = true; - pr_debug2_peo("Kernel has no PERF_SAMPLE_CODE_PAGE_SIZE support, bailing out\n"); - goto out_close; - } else if (!perf_missing_features.data_page_size && - (evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE)) { - perf_missing_features.data_page_size = true; - pr_debug2_peo("Kernel has no PERF_SAMPLE_DATA_PAGE_SIZE support, bailing out\n"); - goto out_close; - } else if (!perf_missing_features.cgroup && evsel->core.attr.cgroup) { - perf_missing_features.cgroup = true; - pr_debug2_peo("Kernel has no cgroup sampling support, bailing out\n"); - goto out_close; - } else if (!perf_missing_features.branch_hw_idx && - (evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_HW_INDEX)) { - perf_missing_features.branch_hw_idx = true; - pr_debug2("switching off branch HW index support\n"); - goto fallback_missing_features; - } else if (!perf_missing_features.aux_output && evsel->core.attr.aux_output) { - perf_missing_features.aux_output = true; - pr_debug2_peo("Kernel has no attr.aux_output support, bailing out\n"); - goto out_close; - } else if (!perf_missing_features.bpf && evsel->core.attr.bpf_event) { - perf_missing_features.bpf = true; - pr_debug2_peo("switching off bpf_event\n"); - goto fallback_missing_features; - } else if (!perf_missing_features.ksymbol && evsel->core.attr.ksymbol) { - perf_missing_features.ksymbol = true; - pr_debug2_peo("switching off ksymbol\n"); - goto fallback_missing_features; - } else if (!perf_missing_features.write_backward && evsel->core.attr.write_backward) { - perf_missing_features.write_backward = true; - pr_debug2_peo("switching off write_backward\n"); - goto out_close; - } else if (!perf_missing_features.clockid_wrong && evsel->core.attr.use_clockid) { - perf_missing_features.clockid_wrong = true; - pr_debug2_peo("switching off clockid\n"); - goto fallback_missing_features; - } else if (!perf_missing_features.clockid && evsel->core.attr.use_clockid) { - perf_missing_features.clockid = true; - pr_debug2_peo("switching off use_clockid\n"); - goto fallback_missing_features; - } else if (!perf_missing_features.cloexec && (evsel->open_flags & PERF_FLAG_FD_CLOEXEC)) { - perf_missing_features.cloexec = true; - pr_debug2_peo("switching off cloexec flag\n"); - goto fallback_missing_features; - } else if (!perf_missing_features.mmap2 && evsel->core.attr.mmap2) { - perf_missing_features.mmap2 = true; - pr_debug2_peo("switching off mmap2\n"); - goto fallback_missing_features; - } else if (!perf_missing_features.exclude_guest && - (evsel->core.attr.exclude_guest || evsel->core.attr.exclude_host)) { - perf_missing_features.exclude_guest = true; - pr_debug2_peo("switching off exclude_guest, exclude_host\n"); - goto fallback_missing_features; - } else if (!perf_missing_features.sample_id_all) { - perf_missing_features.sample_id_all = true; - pr_debug2_peo("switching off sample_id_all\n"); - goto fallback_missing_features; - } else if (!perf_missing_features.lbr_flags && - (evsel->core.attr.branch_sample_type & - (PERF_SAMPLE_BRANCH_NO_CYCLES | - PERF_SAMPLE_BRANCH_NO_FLAGS))) { - perf_missing_features.lbr_flags = true; - pr_debug2_peo("switching off branch sample type no (cycles/flags)\n"); - goto fallback_missing_features; - } else if (!perf_missing_features.group_read && - evsel->core.attr.inherit && - (evsel->core.attr.read_format & PERF_FORMAT_GROUP) && - evsel__is_group_leader(evsel)) { - perf_missing_features.group_read = true; - pr_debug2_peo("switching off group read\n"); - goto fallback_missing_features; - } out_close: if (err) threads->err_thread = thread; diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h index b173700db8af6..e683f4a36e1a8 100644 --- a/tools/perf/util/evsel.h +++ b/tools/perf/util/evsel.h @@ -289,6 +289,7 @@ int evsel__open(struct evsel *evsel, struct perf_cpu_map *cpus, void evsel__close(struct evsel *evsel); int evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus, struct perf_thread_map *threads); +bool evsel__detect_missing_features(struct evsel *evsel); struct perf_sample; -- 2.30.2