From patchwork Mon Jun 12 09:07:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Zijlstra X-Patchwork-Id: 13276180 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 A7B8AC7EE43 for ; Mon, 12 Jun 2023 09:58:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236060AbjFLJ6S (ORCPT ); Mon, 12 Jun 2023 05:58:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33802 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234600AbjFLJy5 (ORCPT ); Mon, 12 Jun 2023 05:54:57 -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 6E20E619A; Mon, 12 Jun 2023 02:39:35 -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=TIflEc6HK/22xB9+LAc8fdYfMJHSxjY/dB735CDFq7w=; b=OzxWN5L/KzC4VUo/iTYaWameCX hrbwrk3ixeRH23F57jlIRFGWnlTcHuMcV7kLy7osS01tgjphDYs7mWn2JZfDkZ1+rR6EcEvrBxrNq zuW6xChuJcvp8qwBU8di5iOmYh8pWWaTGqRRp0lXV86E7IzjUkmvM0B0kyib/7YaiFdsFaLUU6kzN jRUGUTzf6TM4YMKKaPBC+AkGNgv4QE6GBnrVTUB+3uvTZYeky0QKBbK68+lbLkHSUur0WJ5xngoPZ gJIK2g+KtjpXKF0kOxEZS0dUHbQ0CQVAE0El1MhQ7ke9TlaJD5eefsKkFJQO3sIV0cBEXmZEPvZrb 0kCDB3Ig==; 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 1q8e0l-008kQb-39; Mon, 12 Jun 2023 09:39:30 +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 2813A30325F; Mon, 12 Jun 2023 11:38:53 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 0) id 9735A30A77B62; Mon, 12 Jun 2023 11:38:48 +0200 (CEST) Message-ID: <20230612093539.537454913@infradead.org> User-Agent: quilt/0.66 Date: Mon, 12 Jun 2023 11:07:41 +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 28/57] perf; Simplify event_sched_in() References: <20230612090713.652690195@infradead.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org Use guards to reduce gotos and simplify control flow. Signed-off-by: Peter Zijlstra (Intel) --- kernel/events/core.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -1153,6 +1153,8 @@ void perf_pmu_enable(struct pmu *pmu) pmu->pmu_enable(pmu); } +DEFINE_GUARD(perf_pmu_disable, struct pmu *, perf_pmu_disable(_T), perf_pmu_enable(_T)) + static void perf_assert_pmu_disabled(struct pmu *pmu) { WARN_ON_ONCE(*this_cpu_ptr(pmu->pmu_disable_count) == 0); @@ -2489,7 +2491,6 @@ event_sched_in(struct perf_event *event, { struct perf_event_pmu_context *epc = event->pmu_ctx; struct perf_cpu_pmu_context *cpc = this_cpu_ptr(epc->pmu->cpu_pmu_context); - int ret = 0; WARN_ON_ONCE(event->ctx != ctx); @@ -2517,15 +2518,14 @@ event_sched_in(struct perf_event *event, event->hw.interrupts = 0; } - perf_pmu_disable(event->pmu); + guard(perf_pmu_disable)(event->pmu); perf_log_itrace_start(event); if (event->pmu->add(event, PERF_EF_START)) { perf_event_set_state(event, PERF_EVENT_STATE_INACTIVE); event->oncpu = -1; - ret = -EAGAIN; - goto out; + return -EAGAIN; } if (!is_software_event(event)) @@ -2536,10 +2536,7 @@ event_sched_in(struct perf_event *event, if (event->attr.exclusive) cpc->exclusive = 1; -out: - perf_pmu_enable(event->pmu); - - return ret; + return 0; } static int