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=-5.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=ham 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 9D590C43381 for ; Thu, 14 Feb 2019 16:26:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6F17B222DE for ; Thu, 14 Feb 2019 16:26:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2502723AbfBNQ0O (ORCPT ); Thu, 14 Feb 2019 11:26:14 -0500 Received: from mga04.intel.com ([192.55.52.120]:2216 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388556AbfBNQ0O (ORCPT ); Thu, 14 Feb 2019 11:26:14 -0500 X-Amp-Result: UNKNOWN X-Amp-Original-Verdict: FILE UNKNOWN X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 14 Feb 2019 08:26:14 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.58,369,1544515200"; d="scan'208";a="124496687" Received: from tassilo.jf.intel.com (HELO tassilo.localdomain) ([10.7.201.137]) by fmsmga008.fm.intel.com with ESMTP; 14 Feb 2019 08:26:13 -0800 Received: by tassilo.localdomain (Postfix, from userid 1000) id 7EFBB301247; Thu, 14 Feb 2019 08:26:13 -0800 (PST) Date: Thu, 14 Feb 2019 08:26:13 -0800 From: Andi Kleen To: Wei Wang Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, pbonzini@redhat.com, peterz@infradead.org, kan.liang@intel.com, mingo@redhat.com, rkrcmar@redhat.com, like.xu@intel.com, jannh@google.com, arei.gonglei@huawei.com, jmattson@google.com Subject: Re: [PATCH v5 07/12] perf/x86: no counter allocation support Message-ID: <20190214162613.GK16922@tassilo.jf.intel.com> References: <1550135174-5423-1-git-send-email-wei.w.wang@intel.com> <1550135174-5423-8-git-send-email-wei.w.wang@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1550135174-5423-8-git-send-email-wei.w.wang@intel.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h > index 9de8780..ec97a70 100644 > --- a/include/uapi/linux/perf_event.h > +++ b/include/uapi/linux/perf_event.h > @@ -372,7 +372,8 @@ struct perf_event_attr { > context_switch : 1, /* context switch data */ > write_backward : 1, /* Write ring buffer from end to beginning */ > namespaces : 1, /* include namespaces data */ > - __reserved_1 : 35; > + no_counter : 1, /* no counter allocation */ Not sure we really want to expose this in the user ABI. Perhaps make it a feature of the in kernel API only? -Andi