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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 3AB37C432C3 for ; Fri, 15 Nov 2019 08:38:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 10EFD2072D for ; Fri, 15 Nov 2019 08:38:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727001AbfKOIiM (ORCPT ); Fri, 15 Nov 2019 03:38:12 -0500 Received: from mga05.intel.com ([192.55.52.43]:39049 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725829AbfKOIiL (ORCPT ); Fri, 15 Nov 2019 03:38:11 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga105.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 15 Nov 2019 00:38:11 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.68,307,1569308400"; d="scan'208";a="230391002" Received: from um.fi.intel.com (HELO um) ([10.237.72.57]) by fmsmga004.fm.intel.com with ESMTP; 15 Nov 2019 00:38:09 -0800 From: Alexander Shishkin To: Luwei Kang , kvm-pmu@eclists.intel.com Cc: ak@linux.intel.com, kan.liang@linux.intel.com, Luwei Kang , peterz@infradead.org, linux-kernel@vger.kernel.org, alexander.shishkin@linux.intel.com Subject: Re: [PATCH v1 0/4] Enable PEBS when only have PEBS via PT w/o DS In-Reply-To: <1573672574-25247-1-git-send-email-luwei.kang@intel.com> References: <1573672574-25247-1-git-send-email-luwei.kang@intel.com> Date: Fri, 15 Nov 2019 10:38:08 +0200 Message-ID: <87h835edqn.fsf@ashishki-desk.ger.corp.intel.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org You forgot to CC Peter and LKML. Luwei Kang writes: > This patchset is purely perf event system changes that to enable the > PEBS when the system only supports PEBS via Intel PT w/o DS. Currently, > there don't have such hardware which only supports PEBS via PT w/o DS > but it is possible in KVM guest. In Tremont Atom platforms, PEBS via > PT is the only way to enabled PEBS in KVM guest. I don't understand what this says. If PEBS-via-PT is available and DS is not available, what happens and why? Regards, -- Alex