From patchwork Wed Feb 22 23:01:36 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Namhyung Kim X-Patchwork-Id: 13149650 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4542AC678D5 for ; Wed, 22 Feb 2023 23:02:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233084AbjBVXCB (ORCPT ); Wed, 22 Feb 2023 18:02:01 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51360 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232761AbjBVXBv (ORCPT ); Wed, 22 Feb 2023 18:01:51 -0500 Received: from mail-pl1-x62d.google.com (mail-pl1-x62d.google.com [IPv6:2607:f8b0:4864:20::62d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CE1CD474E6; Wed, 22 Feb 2023 15:01:49 -0800 (PST) Received: by mail-pl1-x62d.google.com with SMTP id e5so11780575plg.8; Wed, 22 Feb 2023 15:01:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:sender:from:to:cc:subject:date :message-id:reply-to; bh=+Iwb9Aa3ByH4TCoLetqiEgGUNoqBaXWFpj4ZItRy1eI=; b=ErL0aFbjcmChMGzMHuyfTdxag32KLm5XFWxjPK9u5oh0KMgOVDSsbvbeX6OSLcYARn QYC4j+FAX5t+MUcNB4y8NJQZsISByhbrO5p0jp/duq893mquPd7LvSlTe52cl9FieoVV O6e4qLBUSva83MabT67mbeTaUXOK9mt73YyAlNZkM/7sD57ud3aQQtZ+1BUHTLFNalWj 7YtklDsMuBfi0SRCseLpbeOpbGwEEvZ2SGDrSzFYkzcPSoprITOOY/rwBGlrG4ixUUfv hfrmgTbW4hcwRqQwdpT5+RgUSRZAcVzu3o3CumSuZ7sFe3QA7JmDSUe8lz8QNQsWW1Dm c49w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:sender:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=+Iwb9Aa3ByH4TCoLetqiEgGUNoqBaXWFpj4ZItRy1eI=; b=GNZ7Z/ZiJssCncFwiyHCAS3xzstzuVxhFBN34J6ol42rQ77LvXITfLdDWm3nl8bRm4 UmEDy633DD0XoqJsFHAjrKJoi54DztBsXQS7IG3DsCFnUZiCzetZ3Y/M8p10TMNqy07x kakCYDPrPZxyTvhaIgmxYWhFiwnN8q+7vP3/FYOmuLBst0xrEKgzCOEmrxLAMbG/cO7o 4mTsrBykgxAN+KQBTMbrzr9ofO1+zKMsloUmjzGltR3nGsRtWGMCtGeWj8VW2iUMkvFv 0tHvZgmI3GQH+stZRmVWCn45nkzAukOoGvca6go0g2LvSD7DMKf1g3J1zH/E9F5i6xfq Lv7g== X-Gm-Message-State: AO0yUKX7Uvq5mueY+RdyJ+nEK4D/hE4HJT8pHlPJas5fvaHb05nRUCkw g8D0fDIfIYWyVH4K+fEro24= X-Google-Smtp-Source: AK7set+WUuxXOMQ444j/aDZCSvuKHR/QzmKw5JqI+wirxe+4SyoLmqviVwZZpHalrRBelZbiELXiXQ== X-Received: by 2002:a05:6a20:a027:b0:be:da1c:df7a with SMTP id p39-20020a056a20a02700b000beda1cdf7amr2774710pzj.40.1677106909177; Wed, 22 Feb 2023 15:01:49 -0800 (PST) Received: from moohyul.svl.corp.google.com ([2620:15c:2d4:203:8f76:587d:f250:fecf]) by smtp.gmail.com with ESMTPSA id s1-20020aa78281000000b005ccbe5346ebsm3895127pfm.163.2023.02.22.15.01.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 22 Feb 2023 15:01:48 -0800 (PST) Sender: Namhyung Kim From: Namhyung Kim To: Arnaldo Carvalho de Melo , Jiri Olsa Cc: Peter Zijlstra , Ingo Molnar , Ian Rogers , Adrian Hunter , Andi Kleen , Kan Liang , Song Liu , Stephane Eranian , Ravi Bangoria , Leo Yan , James Clark , Hao Luo , LKML , linux-perf-users@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH 3/8] perf record: Add BPF event filter support Date: Wed, 22 Feb 2023 15:01:36 -0800 Message-Id: <20230222230141.1729048-4-namhyung@kernel.org> X-Mailer: git-send-email 2.39.2.637.g21b0678d19-goog In-Reply-To: <20230222230141.1729048-1-namhyung@kernel.org> References: <20230222230141.1729048-1-namhyung@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Use --filter option to set BPF filter for generic events other than the tracepoints or Intel PT. The BPF program will check the sample data and filter according to the expression. For example, the below is the typical perf record for frequency mode. The sample period started from 1 and increased gradually. $ sudo ./perf record -e cycles true $ sudo ./perf script perf-exec 2272336 546683.916875: 1 cycles: ffffffff828499b8 perf_event_exec+0x298 ([kernel.kallsyms]) perf-exec 2272336 546683.916892: 1 cycles: ffffffff828499b8 perf_event_exec+0x298 ([kernel.kallsyms]) perf-exec 2272336 546683.916899: 3 cycles: ffffffff828499b8 perf_event_exec+0x298 ([kernel.kallsyms]) perf-exec 2272336 546683.916905: 17 cycles: ffffffff828499b8 perf_event_exec+0x298 ([kernel.kallsyms]) perf-exec 2272336 546683.916911: 100 cycles: ffffffff828499b8 perf_event_exec+0x298 ([kernel.kallsyms]) perf-exec 2272336 546683.916917: 589 cycles: ffffffff828499b8 perf_event_exec+0x298 ([kernel.kallsyms]) perf-exec 2272336 546683.916924: 3470 cycles: ffffffff828499b8 perf_event_exec+0x298 ([kernel.kallsyms]) perf-exec 2272336 546683.916930: 20465 cycles: ffffffff828499b8 perf_event_exec+0x298 ([kernel.kallsyms]) true 2272336 546683.916940: 119873 cycles: ffffffff8283afdd perf_iterate_ctx+0x2d ([kernel.kallsyms]) true 2272336 546683.917003: 461349 cycles: ffffffff82892517 vma_interval_tree_insert+0x37 ([kernel.kallsyms]) true 2272336 546683.917237: 635778 cycles: ffffffff82a11400 security_mmap_file+0x20 ([kernel.kallsyms]) When you add a BPF filter to get samples having periods greater than 1000, the output would look like below: $ sudo ./perf record -e cycles --filter 'period > 1000' true $ sudo ./perf script perf-exec 2273949 546850.708501: 5029 cycles: ffffffff826f9e25 finish_wait+0x5 ([kernel.kallsyms]) perf-exec 2273949 546850.708508: 32409 cycles: ffffffff826f9e25 finish_wait+0x5 ([kernel.kallsyms]) perf-exec 2273949 546850.708526: 143369 cycles: ffffffff82b4cdbf xas_start+0x5f ([kernel.kallsyms]) perf-exec 2273949 546850.708600: 372650 cycles: ffffffff8286b8f7 __pagevec_lru_add+0x117 ([kernel.kallsyms]) perf-exec 2273949 546850.708791: 482953 cycles: ffffffff829190de __mod_memcg_lruvec_state+0x4e ([kernel.kallsyms]) true 2273949 546850.709036: 501985 cycles: ffffffff828add7c tlb_gather_mmu+0x4c ([kernel.kallsyms]) true 2273949 546850.709292: 503065 cycles: 7f2446d97c03 _dl_map_object_deps+0x973 (/usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2) Signed-off-by: Namhyung Kim --- tools/perf/Documentation/perf-record.txt | 15 +++++++++++--- tools/perf/util/bpf_counter.c | 3 +-- tools/perf/util/evlist.c | 25 +++++++++++++++++------- tools/perf/util/evsel.c | 2 ++ tools/perf/util/parse-events.c | 8 +++----- 5 files changed, 36 insertions(+), 17 deletions(-) diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt index ff815c2f67e8..9f4e1337e6dc 100644 --- a/tools/perf/Documentation/perf-record.txt +++ b/tools/perf/Documentation/perf-record.txt @@ -119,9 +119,12 @@ OPTIONS "perf report" to view group events together. --filter=:: - Event filter. This option should follow an event selector (-e) which - selects either tracepoint event(s) or a hardware trace PMU - (e.g. Intel PT or CoreSight). + Event filter. This option should follow an event selector (-e). + If the event is a tracepoint, the filter string will be parsed by + the kernel. If the event is a hardware trace PMU (e.g. Intel PT + or CoreSight), it'll be processed as an address filter. Otherwise + it means a general filter using BPF which can be applied for any + kind of events. - tracepoint filters @@ -174,6 +177,12 @@ OPTIONS within a single mapping. MMAP events (or /proc//maps) can be examined to determine if that is a possibility. + - bpf filters + + BPF filter can access the sample data and make a decision based on the + data. Users need to set the appropriate sample type to use the BPF + filter. + Multiple filters can be separated with space or comma. --exclude-perf:: diff --git a/tools/perf/util/bpf_counter.c b/tools/perf/util/bpf_counter.c index eeee899fcf34..0414385794ee 100644 --- a/tools/perf/util/bpf_counter.c +++ b/tools/perf/util/bpf_counter.c @@ -781,8 +781,7 @@ extern struct bpf_counter_ops bperf_cgrp_ops; static inline bool bpf_counter_skip(struct evsel *evsel) { - return list_empty(&evsel->bpf_counter_list) && - evsel->follower_skel == NULL; + return evsel->bpf_counter_ops == NULL; } int bpf_counter__install_pe(struct evsel *evsel, int cpu_map_idx, int fd) diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index 817df2504a1e..1ae047b24c89 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -31,6 +31,7 @@ #include "util/evlist-hybrid.h" #include "util/pmu.h" #include "util/sample.h" +#include "util/bpf-filter.h" #include #include #include @@ -1086,17 +1087,27 @@ int evlist__apply_filters(struct evlist *evlist, struct evsel **err_evsel) int err = 0; evlist__for_each_entry(evlist, evsel) { - if (evsel->filter == NULL) - continue; - /* * filters only work for tracepoint event, which doesn't have cpu limit. * So evlist and evsel should always be same. */ - err = perf_evsel__apply_filter(&evsel->core, evsel->filter); - if (err) { - *err_evsel = evsel; - break; + if (evsel->filter) { + err = perf_evsel__apply_filter(&evsel->core, evsel->filter); + if (err) { + *err_evsel = evsel; + break; + } + } + + /* + * non-tracepoint events can have BPF filters. + */ + if (!list_empty(&evsel->bpf_filters)) { + err = perf_bpf_filter__prepare(evsel); + if (err) { + *err_evsel = evsel; + break; + } } } diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index 51e8ce6edddc..cae624fde026 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -50,6 +50,7 @@ #include "off_cpu.h" #include "../perf-sys.h" #include "util/parse-branch-options.h" +#include "util/bpf-filter.h" #include #include #include @@ -1494,6 +1495,7 @@ void evsel__exit(struct evsel *evsel) assert(list_empty(&evsel->core.node)); assert(evsel->evlist == NULL); bpf_counter__destroy(evsel); + perf_bpf_filter__destroy(evsel); evsel__free_counts(evsel); perf_evsel__free_fd(&evsel->core); perf_evsel__free_id(&evsel->core); diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c index 0336ff27c15f..4371a2bb2564 100644 --- a/tools/perf/util/parse-events.c +++ b/tools/perf/util/parse-events.c @@ -27,6 +27,7 @@ #include "perf.h" #include "util/parse-events-hybrid.h" #include "util/pmu-hybrid.h" +#include "util/bpf-filter.h" #include "tracepoint.h" #include "thread_map.h" @@ -2537,11 +2538,8 @@ static int set_filter(struct evsel *evsel, const void *arg) perf_pmu__scan_file(pmu, "nr_addr_filters", "%d", &nr_addr_filters); - if (!nr_addr_filters) { - fprintf(stderr, - "This CPU does not support address filtering\n"); - return -1; - } + if (!nr_addr_filters) + return perf_bpf_filter__parse(&evsel->bpf_filters, str); if (evsel__append_addr_filter(evsel, str) < 0) { fprintf(stderr,