From patchwork Mon Jun 12 09:07:47 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Zijlstra X-Patchwork-Id: 106427 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:994d:0:b0:3d9:f83d:47d9 with SMTP id k13csp2477085vqr; Mon, 12 Jun 2023 03:11:12 -0700 (PDT) X-Google-Smtp-Source: ACHHUZ5LNFJqfnyVDn1BgL8xoMM6P1y8Q17WUA9mjBJWcn0jBeK26R0FuD2wi32XidKrJLKd182k X-Received: by 2002:a17:90a:f312:b0:250:9e7b:2798 with SMTP id ca18-20020a17090af31200b002509e7b2798mr7834243pjb.18.1686564671717; Mon, 12 Jun 2023 03:11:11 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1686564671; cv=none; d=google.com; s=arc-20160816; b=k5O3zuHBojd3/b2bavYx2VuXB0vbhyJWHQdubeCIkGiNSzDIFsmFSt6ZCHztxfDue4 /GrzOkyXJSW2m7YlXypRSYw5ceoBb1rQefc6NCxGrjzXBhldrwi3vMLn9QAKS6teRX32 zP/WKa8XkfLLYupzrijC09ZLnU7tnmmHRIHezijmWg418ROFQ45Mu6Ls0MzRVOUhqBBC uFpe2x3V2Dm41RMEUFku19iDbxRFjMwhWlhf0uSkGmtSzrKv+2N1KfUmimbPV4Ax95g6 TlKtYR7ej4Zjuzu6MgCeYk1+/vS6VvZhJOnilud9/VhiBnr2Qc8BE9fWp5PRE1wZKEdh ONMw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:mime-version:references:subject:cc:to:from:date :user-agent:message-id:dkim-signature; bh=0Nln3H/TQf9zjJAhRuDD5Vdsf6AHs8EETAgdoNVjkyE=; b=AB5my9X/1Z9I10fVYJPx0DL70PH00DjfWj1TtPGzCR9C4YNU7xw4N0WK/Ij6jZwfiS OOWHwoV5r6BjMD98fx6qdHWCB3uQyi0l/mfXzrGudWHlUPwlexe34ySxRLoMLLQhkktn LHQr3DaSXsEbvHizzzTylW6+dxotriKvn9yScvV8qKi2znUoyawcb3A5k/z/u8IlXz5r 0aGIpngxrlepAal/GFi9MQkE0s3gQ4NBR9KcUwiy3gigNrdd5HfTA6ZyRbJEHI36UJ72 Z+R+BaSl7Qw41a8k1kvWVYLlIqBfffwgADoka3aBwZQiKD/jZxSD2A8rJEAFJ00o73vR Zh9Q== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=desiato.20200630 header.b=aLyzlCpj; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id a184-20020a6390c1000000b0052868a865d8si6631205pge.430.2023.06.12.03.10.59; Mon, 12 Jun 2023 03:11:11 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=desiato.20200630 header.b=aLyzlCpj; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236167AbjFLJ6m (ORCPT + 99 others); Mon, 12 Jun 2023 05:58:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60490 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229877AbjFLJyc (ORCPT ); Mon, 12 Jun 2023 05:54:32 -0400 Received: from desiato.infradead.org (desiato.infradead.org [IPv6:2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ABC9C6189; Mon, 12 Jun 2023 02:39:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Content-Type:MIME-Version:References: Subject:Cc:To:From:Date:Message-ID:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:In-Reply-To; bh=0Nln3H/TQf9zjJAhRuDD5Vdsf6AHs8EETAgdoNVjkyE=; b=aLyzlCpjSY84iDgpsEBBBGJX3P lK9yNsqeaoP3u7ZT5H3JL27+RTLru0GApQ5l1v5uV8i/wJIkHH27c0wmrJ/GCkYQ/G7TqE972r+Z4 olS6TpdyK9sVlqg98ePCC+diSOfoU1XnPSfTCvcxnVGIIzofX5B72ITAND3PEzyTDUpjkk1zcu8Ub PdMjf6R10+giGpo+mqNbqKy4UQa4reNeKvcpiwdZPnE+1yKAYR8IhUcKfW8HYKgRVSbmBWw9pmlCJ zqWAeUSmHhgSXgznUhoQ3Aaf3QwuEHOuaRjzBPrKSygfGuGbdsxJRVlJjK0e4SLbm0NNjGwLzFteH qxfDrnkg==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1q8e0m-008kQi-0Q; Mon, 12 Jun 2023 09:39:00 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 2EF723032BD; Mon, 12 Jun 2023 11:38:53 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 0) id B8BAA30A77B6C; Mon, 12 Jun 2023 11:38:48 +0200 (CEST) Message-ID: <20230612093539.966607037@infradead.org> User-Agent: quilt/0.66 Date: Mon, 12 Jun 2023 11:07:47 +0200 From: Peter Zijlstra To: torvalds@linux-foundation.org, keescook@chromium.org, gregkh@linuxfoundation.org, pbonzini@redhat.com Cc: masahiroy@kernel.org, nathan@kernel.org, ndesaulniers@google.com, nicolas@fjasle.eu, catalin.marinas@arm.com, will@kernel.org, vkoul@kernel.org, trix@redhat.com, ojeda@kernel.org, peterz@infradead.org, mingo@redhat.com, longman@redhat.com, boqun.feng@gmail.com, dennis@kernel.org, tj@kernel.org, cl@linux.com, acme@kernel.org, mark.rutland@arm.com, alexander.shishkin@linux.intel.com, jolsa@kernel.org, namhyung@kernel.org, irogers@google.com, adrian.hunter@intel.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com, paulmck@kernel.org, frederic@kernel.org, quic_neeraju@quicinc.com, joel@joelfernandes.org, josh@joshtriplett.org, mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com, rientjes@google.com, vbabka@suse.cz, roman.gushchin@linux.dev, 42.hyeyoo@gmail.com, apw@canonical.com, joe@perches.com, dwaipayanray1@gmail.com, lukas.bulwahn@gmail.com, john.johansen@canonical.com, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org, llvm@lists.linux.dev, linux-perf-users@vger.kernel.org, rcu@vger.kernel.org, linux-security-module@vger.kernel.org, tglx@linutronix.de, ravi.bangoria@amd.com, error27@gmail.com, luc.vanoostenryck@gmail.com Subject: [PATCH v3 34/57] perf: Simplify perf_event_*_on_exec() References: <20230612090713.652690195@infradead.org> MIME-Version: 1.0 X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,SPF_HELO_NONE, SPF_NONE,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1768491237217586146?= X-GMAIL-MSGID: =?utf-8?q?1768491237217586146?= Signed-off-by: Peter Zijlstra (Intel) --- kernel/events/core.c | 88 +++++++++++++++++++++++---------------------------- 1 file changed, 40 insertions(+), 48 deletions(-) --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -4318,39 +4318,36 @@ static void perf_event_enable_on_exec(st enum event_type_t event_type = 0; struct perf_cpu_context *cpuctx; struct perf_event *event; - unsigned long flags; int enabled = 0; - local_irq_save(flags); - if (WARN_ON_ONCE(current->perf_event_ctxp != ctx)) - goto out; - - if (!ctx->nr_events) - goto out; - - cpuctx = this_cpu_ptr(&perf_cpu_context); - perf_ctx_lock(cpuctx, ctx); - ctx_sched_out(ctx, EVENT_TIME); - - list_for_each_entry(event, &ctx->event_list, event_entry) { - enabled |= event_enable_on_exec(event, ctx); - event_type |= get_event_type(event); + scoped_guard (irqsave) { + if (WARN_ON_ONCE(current->perf_event_ctxp != ctx)) + return; + + if (!ctx->nr_events) + return; + + cpuctx = this_cpu_ptr(&perf_cpu_context); + guard(perf_ctx_lock)(cpuctx, ctx); + + ctx_sched_out(ctx, EVENT_TIME); + + list_for_each_entry(event, &ctx->event_list, event_entry) { + enabled |= event_enable_on_exec(event, ctx); + event_type |= get_event_type(event); + } + + /* + * Unclone and reschedule this context if we enabled any event. + */ + if (enabled) { + clone_ctx = unclone_ctx(ctx); + ctx_resched(cpuctx, ctx, event_type); + } else { + ctx_sched_in(ctx, EVENT_TIME); + } } - /* - * Unclone and reschedule this context if we enabled any event. - */ - if (enabled) { - clone_ctx = unclone_ctx(ctx); - ctx_resched(cpuctx, ctx, event_type); - } else { - ctx_sched_in(ctx, EVENT_TIME); - } - perf_ctx_unlock(cpuctx, ctx); - -out: - local_irq_restore(flags); - if (clone_ctx) put_ctx(clone_ctx); } @@ -4367,34 +4364,29 @@ static void perf_event_remove_on_exec(st { struct perf_event_context *clone_ctx = NULL; struct perf_event *event, *next; - unsigned long flags; bool modified = false; - mutex_lock(&ctx->mutex); + scoped_guard (mutex, &ctx->mutex) { + if (WARN_ON_ONCE(ctx->task != current)) + return; - if (WARN_ON_ONCE(ctx->task != current)) - goto unlock; + list_for_each_entry_safe(event, next, &ctx->event_list, event_entry) { + if (!event->attr.remove_on_exec) + continue; - list_for_each_entry_safe(event, next, &ctx->event_list, event_entry) { - if (!event->attr.remove_on_exec) - continue; + if (!is_kernel_event(event)) + perf_remove_from_owner(event); - if (!is_kernel_event(event)) - perf_remove_from_owner(event); + modified = true; - modified = true; + perf_event_exit_event(event, ctx); + } - perf_event_exit_event(event, ctx); + guard(raw_spinlock_irqsave)(&ctx->lock); + if (modified) + clone_ctx = unclone_ctx(ctx); } - raw_spin_lock_irqsave(&ctx->lock, flags); - if (modified) - clone_ctx = unclone_ctx(ctx); - raw_spin_unlock_irqrestore(&ctx->lock, flags); - -unlock: - mutex_unlock(&ctx->mutex); - if (clone_ctx) put_ctx(clone_ctx); }