From patchwork Fri Apr 22 05:34:00 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Namhyung Kim X-Patchwork-Id: 12822751 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 00E7FC433EF for ; Fri, 22 Apr 2022 05:37:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232438AbiDVFkA (ORCPT ); Fri, 22 Apr 2022 01:40:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57894 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1444172AbiDVFhA (ORCPT ); Fri, 22 Apr 2022 01:37:00 -0400 Received: from mail-pl1-x62c.google.com (mail-pl1-x62c.google.com [IPv6:2607:f8b0:4864:20::62c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AEACE4F448; Thu, 21 Apr 2022 22:34:08 -0700 (PDT) Received: by mail-pl1-x62c.google.com with SMTP id u15so5115687ple.4; Thu, 21 Apr 2022 22:34:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=em5/zodA7layme8bSqQKMP2f6/tfNS7ip5sBkTMrN9A=; b=KHZZ22qesd+CEISUYdFzi/FRutHa+q7TOp4ZVXeLvsIlanz8UcRxkz155LV4hu4BPH Bh4yu0QLs20Z31QlvRc9CiswHI9xIQ8kujCXzcNmRuqFNUCoFNdTCoEDSNBS3cVUGXJV r9gZmPrLoecxN3TjRrF6Cf/LcuYw55cRxLvhK1rnHAreb6E0NrUi4ht2JpCxRHKBriyh mDRBE70pOeSd8WvXKJhxLJAaisb/MEO/PJu65Q5dYDTBebmXr1YQ0IXYRmVZ02u/RTWr VmRInTKR9xndu4YulM+vyKdBOKwxFeKtvIhmD3PP/BzqxpYGU4rWC3srJ7VnzSAAPvgU BPwQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :in-reply-to:references:mime-version:content-transfer-encoding; bh=em5/zodA7layme8bSqQKMP2f6/tfNS7ip5sBkTMrN9A=; b=TXQsmN7wycrFhmgKE91SVXSn1akczCYuXPcNYPVutKyEcXWGZaIWPpPnyzByGx/gL5 nGjLbQt7LPwwGZ28tPAZKK+BiorfGwnZsejs0cxzRHFhPcx9WzhknsQOugVagbPMUyYY FI58TlKZm3gddnok6UWOSLM6gqJbsemobz66M+SfaJq3nq2XLw/EpRDTrT1Xe4MW92Gr TS9rp1uD77U1EtDaHNH/+uyY7DEbMJFYL4ldLX4/Ad9WHP0zRoekoVaWy8o+d67v2ZkP 9ivzKbg5Rrh7FM7u2MrO3De1AUNl2w/+9rqFKzAlqZ3cLumFPJz8nih8ZmASsnJaPmkK Ve9Q== X-Gm-Message-State: AOAM5330MHUQZHVGBjuJtdjW0wEzERQGezlLBtxILhM/yL4u0R7ykqI2 EEl4UFTt/NnUepm2yLx3LDg= X-Google-Smtp-Source: ABdhPJzbOYKR6l9hGWbRogqQB/Harv/b9Lyt2KCiBOt6R93CV7V+sDrAIl70df7Bs3CDdP2hKFd+IQ== X-Received: by 2002:a17:903:28d:b0:158:ee84:e588 with SMTP id j13-20020a170903028d00b00158ee84e588mr2820672plr.60.1650605648233; Thu, 21 Apr 2022 22:34:08 -0700 (PDT) Received: from balhae.hsd1.ca.comcast.net ([2601:647:4f00:3590:32e3:a023:46c1:80cd]) by smtp.gmail.com with ESMTPSA id 204-20020a6302d5000000b00385f29b02b2sm886519pgc.50.2022.04.21.22.34.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Apr 2022 22:34:07 -0700 (PDT) Sender: Namhyung Kim From: Namhyung Kim To: Arnaldo Carvalho de Melo , Jiri Olsa Cc: Ingo Molnar , Peter Zijlstra , LKML , Andi Kleen , Ian Rogers , Song Liu , Hao Luo , bpf@vger.kernel.org, linux-perf-users@vger.kernel.org, Blake Jones Subject: [PATCH 3/4] perf record: Implement basic filtering for off-cpu Date: Thu, 21 Apr 2022 22:34:00 -0700 Message-Id: <20220422053401.208207-4-namhyung@kernel.org> X-Mailer: git-send-email 2.36.0.rc2.479.g8af0fa9b8e-goog In-Reply-To: <20220422053401.208207-1-namhyung@kernel.org> References: <20220422053401.208207-1-namhyung@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org It should honor cpu and task filtering with -a, -C or -p, -t options. Signed-off-by: Namhyung Kim --- tools/perf/builtin-record.c | 2 +- tools/perf/util/bpf_off_cpu.c | 78 +++++++++++++++++++++++--- tools/perf/util/bpf_skel/off_cpu.bpf.c | 52 +++++++++++++++-- 3 files changed, 119 insertions(+), 13 deletions(-) diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 3d24d528ba8e..592384e058c3 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -907,7 +907,7 @@ static int record__config_text_poke(struct evlist *evlist) static int record__config_off_cpu(struct record *rec) { - return off_cpu_prepare(rec->evlist); + return off_cpu_prepare(rec->evlist, &rec->opts.target); } static bool record__kcore_readable(struct machine *machine) diff --git a/tools/perf/util/bpf_off_cpu.c b/tools/perf/util/bpf_off_cpu.c index 1f87d2a9b86d..89f36229041d 100644 --- a/tools/perf/util/bpf_off_cpu.c +++ b/tools/perf/util/bpf_off_cpu.c @@ -6,6 +6,9 @@ #include "util/off_cpu.h" #include "util/perf-hooks.h" #include "util/session.h" +#include "util/target.h" +#include "util/cpumap.h" +#include "util/thread_map.h" #include #include "bpf_skel/off_cpu.skel.h" @@ -57,8 +60,23 @@ static int off_cpu_config(struct evlist *evlist) return 0; } -static void off_cpu_start(void *arg __maybe_unused) +static void off_cpu_start(void *arg) { + struct evlist *evlist = arg; + + /* update task filter for the given workload */ + if (!skel->bss->has_cpu && !skel->bss->has_task && + perf_thread_map__pid(evlist->core.threads, 0) != -1) { + int fd; + u32 pid; + u8 val = 1; + + skel->bss->has_task = 1; + fd = bpf_map__fd(skel->maps.task_filter); + pid = perf_thread_map__pid(evlist->core.threads, 0); + bpf_map_update_elem(fd, &pid, &val, BPF_ANY); + } + skel->bss->enabled = 1; } @@ -68,31 +86,75 @@ static void off_cpu_finish(void *arg __maybe_unused) off_cpu_bpf__destroy(skel); } -int off_cpu_prepare(struct evlist *evlist) +int off_cpu_prepare(struct evlist *evlist, struct target *target) { - int err; + int err, fd, i; + int ncpus = 1, ntasks = 1; if (off_cpu_config(evlist) < 0) { pr_err("Failed to config off-cpu BPF event\n"); return -1; } - set_max_rlimit(); - - skel = off_cpu_bpf__open_and_load(); + skel = off_cpu_bpf__open(); if (!skel) { pr_err("Failed to open off-cpu skeleton\n"); return -1; } + /* don't need to set cpu filter for system-wide mode */ + if (target->cpu_list) { + ncpus = perf_cpu_map__nr(evlist->core.user_requested_cpus); + bpf_map__set_max_entries(skel->maps.cpu_filter, ncpus); + } + + if (target__has_task(target)) { + ncpus = perf_thread_map__nr(evlist->core.threads); + bpf_map__set_max_entries(skel->maps.task_filter, ntasks); + } + + set_max_rlimit(); + + err = off_cpu_bpf__load(skel); + if (err) { + pr_err("Failed to load off-cpu skeleton\n"); + goto out; + } + + if (target->cpu_list) { + u32 cpu; + u8 val = 1; + + skel->bss->has_cpu = 1; + fd = bpf_map__fd(skel->maps.cpu_filter); + + for (i = 0; i < ncpus; i++) { + cpu = perf_cpu_map__cpu(evlist->core.user_requested_cpus, i).cpu; + bpf_map_update_elem(fd, &cpu, &val, BPF_ANY); + } + } + + if (target__has_task(target)) { + u32 pid; + u8 val = 1; + + skel->bss->has_task = 1; + fd = bpf_map__fd(skel->maps.task_filter); + + for (i = 0; i < ntasks; i++) { + pid = perf_thread_map__pid(evlist->core.threads, i); + bpf_map_update_elem(fd, &pid, &val, BPF_ANY); + } + } + err = off_cpu_bpf__attach(skel); if (err) { pr_err("Failed to attach off-cpu skeleton\n"); goto out; } - if (perf_hooks__set_hook("record_start", off_cpu_start, NULL) || - perf_hooks__set_hook("record_end", off_cpu_finish, NULL)) { + if (perf_hooks__set_hook("record_start", off_cpu_start, evlist) || + perf_hooks__set_hook("record_end", off_cpu_finish, evlist)) { pr_err("Failed to attach off-cpu skeleton\n"); goto out; } diff --git a/tools/perf/util/bpf_skel/off_cpu.bpf.c b/tools/perf/util/bpf_skel/off_cpu.bpf.c index 2bc6f7cc59ea..27425fe361e2 100644 --- a/tools/perf/util/bpf_skel/off_cpu.bpf.c +++ b/tools/perf/util/bpf_skel/off_cpu.bpf.c @@ -49,12 +49,28 @@ struct { __uint(max_entries, MAX_ENTRIES); } off_cpu SEC(".maps"); +struct { + __uint(type, BPF_MAP_TYPE_HASH); + __uint(key_size, sizeof(__u32)); + __uint(value_size, sizeof(__u8)); + __uint(max_entries, 1); +} cpu_filter SEC(".maps"); + +struct { + __uint(type, BPF_MAP_TYPE_HASH); + __uint(key_size, sizeof(__u32)); + __uint(value_size, sizeof(__u8)); + __uint(max_entries, 1); +} task_filter SEC(".maps"); + /* old kernel task_struct definition */ struct task_struct___old { long state; } __attribute__((preserve_access_index)); int enabled = 0; +int has_cpu = 0; +int has_task = 0; /* * recently task_struct->state renamed to __state so it made an incompatible @@ -74,6 +90,37 @@ static inline int get_task_state(struct task_struct *t) return BPF_CORE_READ(t_old, state); } +static inline int can_record(struct task_struct *t, int state) +{ + if (has_cpu) { + __u32 cpu = bpf_get_smp_processor_id(); + __u8 *ok; + + ok = bpf_map_lookup_elem(&cpu_filter, &cpu); + if (!ok) + return 0; + } + + if (has_task) { + __u8 *ok; + __u32 pid = t->pid; + + ok = bpf_map_lookup_elem(&task_filter, &pid); + if (!ok) + return 0; + } + + /* kernel threads don't have user stack */ + if (t->flags & PF_KTHREAD) + return 0; + + if (state != TASK_INTERRUPTIBLE && + state != TASK_UNINTERRUPTIBLE) + return 0; + + return 1; +} + SEC("tp_btf/sched_switch") int on_switch(u64 *ctx) { @@ -92,10 +139,7 @@ int on_switch(u64 *ctx) ts = bpf_ktime_get_ns(); - if (prev->flags & PF_KTHREAD) - goto next; - if (state != TASK_INTERRUPTIBLE && - state != TASK_UNINTERRUPTIBLE) + if (!can_record(prev, state)) goto next; stack_id = bpf_get_stackid(ctx, &stacks,