From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CEB9AC433DB for ; Wed, 10 Mar 2021 16:51:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9E1F064FBB for ; Wed, 10 Mar 2021 16:51:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233378AbhCJQue (ORCPT ); Wed, 10 Mar 2021 11:50:34 -0500 Received: from mga04.intel.com ([192.55.52.120]:42702 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233135AbhCJQuP (ORCPT ); Wed, 10 Mar 2021 11:50:15 -0500 IronPort-SDR: COY+D1jAQ23QKAABkPhF5T26ytySGhXXv8ScVtG/ofQUnqNCJoYoa/NK0MOn2vQ2AszUujeI7u 2g49MJLKvCUQ== X-IronPort-AV: E=McAfee;i="6000,8403,9919"; a="186132288" X-IronPort-AV: E=Sophos;i="5.81,237,1610438400"; d="scan'208";a="186132288" Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Mar 2021 08:50:08 -0800 IronPort-SDR: Mrbw2ibK0dfP+/9hNkJEaFNeK5ajW8dmrFCGWLi9Pb1OxZTKy4J7zSIrXmZSNy5L/FDta8p8nl TGETxF8Ul22A== X-IronPort-AV: E=Sophos;i="5.81,237,1610438400"; d="scan'208";a="431280369" Received: from umalluga-mobl.amr.corp.intel.com (HELO [10.209.90.191]) ([10.209.90.191]) by fmsmga004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Mar 2021 08:50:07 -0800 Subject: Re: [PATCH V2 16/25] perf/x86: Register hybrid PMUs To: kan.liang@linux.intel.com, peterz@infradead.org, mingo@kernel.org, linux-kernel@vger.kernel.org Cc: acme@kernel.org, tglx@linutronix.de, bp@alien8.de, namhyung@kernel.org, jolsa@redhat.com, ak@linux.intel.com, yao.jin@linux.intel.com, alexander.shishkin@linux.intel.com, adrian.hunter@intel.com References: <1615394281-68214-1-git-send-email-kan.liang@linux.intel.com> <1615394281-68214-17-git-send-email-kan.liang@linux.intel.com> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <1615394281-68214-17-git-send-email-kan.liang@linux.intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 3/10/21 8:37 AM, kan.liang@linux.intel.com wrote: > - err = perf_pmu_register(&pmu, "cpu", PERF_TYPE_RAW); > - if (err) > - goto out2; > + if (!is_hybrid()) { > + err = perf_pmu_register(&pmu, "cpu", PERF_TYPE_RAW); > + if (err) > + goto out2; > + } else { > + u8 cpu_type = get_hybrid_cpu_type(smp_processor_id()); > + struct x86_hybrid_pmu *hybrid_pmu; > + int i; Where's the preempt_disable()? > +static void init_hybrid_pmu(int cpu) > +{ > + unsigned int fixed_mask, unused_eax, unused_ebx, unused_edx; > + struct cpu_hw_events *cpuc = &per_cpu(cpu_hw_events, cpu); > + u8 cpu_type = get_hybrid_cpu_type(cpu); > + struct x86_hybrid_pmu *pmu = NULL; > + struct perf_cpu_context *cpuctx; > + int i; Ditto. Are we really sure the IPIs are worth the trouble? Why don't we just cache the leaf when we bring the CPU up like just about every other thing we read from CPUID?