From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C9B6018AF0 for ; Mon, 12 Jun 2023 09:45:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; 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=vBUL+P10jAOvg5j6kSlF2qo+oprvGK1yGYCCYSiAqlM=; b=NFuacbXRk1gej6UwVgLc5tNbL/ Rg3HhKBUmBwl5eLO+25JusMfSuIbyFVR/iUbv784FGfrgacXrn7NqDLzDE0FRvICex1OyPQ1v6sir 2XfS9G9NRaxckYmtb2iC8wKstPTcK7x76yeCDSmRMdFkjrgTu/V1PBFcOb8PR+SJS4k4G3LaUbuug aLZU4s0ZG5xxXzMb3tMoJAIyEzjBHzcirZvJrDNWxTDRGx2uI+jItcz4dFj/bh+yWpfl6YNw2dwMf dkRpxXp9x4mnWBxHUfuIuRlkVIDAL6TszLM10QD9hqFaG724GHiWCbVaBNkbUXvGCxbDmMTuu5725 3aUtil+g==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1q8e0m-002NBt-Dt; Mon, 12 Jun 2023 09:38:56 +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 27D323031CC; Mon, 12 Jun 2023 11:38:53 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 0) id 9C85030A77B66; Mon, 12 Jun 2023 11:38:48 +0200 (CEST) Message-ID: <20230612093539.611540686@infradead.org> User-Agent: quilt/0.66 Date: Mon, 12 Jun 2023 11:07:42 +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 29/57] perf: Simplify: __perf_install_in_context() References: <20230612090713.652690195@infradead.org> Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Signed-off-by: Peter Zijlstra (Intel) --- kernel/events/core.c | 21 +++++++-------------- 1 file changed, 7 insertions(+), 14 deletions(-) --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -2732,13 +2732,13 @@ static int __perf_install_in_context(vo struct perf_cpu_context *cpuctx = this_cpu_ptr(&perf_cpu_context); struct perf_event_context *task_ctx = cpuctx->task_ctx; bool reprogram = true; - int ret = 0; - raw_spin_lock(&cpuctx->ctx.lock); - if (ctx->task) { - raw_spin_lock(&ctx->lock); + if (ctx->task) task_ctx = ctx; + guard(perf_ctx_lock)(cpuctx, task_ctx); + + if (ctx->task) { reprogram = (ctx->task == current); /* @@ -2748,14 +2748,10 @@ static int __perf_install_in_context(vo * If its not running, we don't care, ctx->lock will * serialize against it becoming runnable. */ - if (task_curr(ctx->task) && !reprogram) { - ret = -ESRCH; - goto unlock; - } + if (task_curr(ctx->task) && !reprogram) + return -ESRCH; WARN_ON_ONCE(reprogram && cpuctx->task_ctx && cpuctx->task_ctx != ctx); - } else if (task_ctx) { - raw_spin_lock(&task_ctx->lock); } #ifdef CONFIG_CGROUP_PERF @@ -2778,10 +2774,7 @@ static int __perf_install_in_context(vo add_event_to_ctx(event, ctx); } -unlock: - perf_ctx_unlock(cpuctx, task_ctx); - - return ret; + return 0; } static bool exclusive_event_installable(struct perf_event *event,