Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752884AbbBQFcl (ORCPT ); Tue, 17 Feb 2015 00:32:41 -0500 Received: from mail-wg0-f42.google.com ([74.125.82.42]:43089 "EHLO mail-wg0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751598AbbBQFck (ORCPT ); Tue, 17 Feb 2015 00:32:40 -0500 Message-ID: <54E2D272.1080607@gmail.com> Date: Tue, 17 Feb 2015 06:32:34 +0100 From: "Michael Kerrisk (man-pages)" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0 MIME-Version: 1.0 To: Vince Weaver CC: mtk.manpages@gmail.com, linux-man@vger.kernel.org, linux-kernel@vger.kernel.org, Peter Zijlstra , Paul Mackerras , Ingo Molnar , Arnaldo Carvalho de Melo Subject: Re: [patch] perf_event_open.2: Exclude_hv clarification References: In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2139 Lines: 63 Hi Paul Mackerass, Would you be willing to review/comment on Vince's patch, please. Cheers, Michael On 02/11/2015 08:04 PM, Vince Weaver wrote: > > This manpage patch relates to the exclude_hv bit added to the kernel > in the following commit: > > exclude_hv; Linux 2.6.31 > commit 0475f9ea8e2cc030298908949e0d5da9f2fc2cfe > Author: Paul Mackerras > > perf_counters: allow users to count user, kernel and/or hypervisor events > > Signed-off-by: Paul Mackerras > > The updated manpage text points out that the exclude_hv > "exclude hypervisor" bit only applies on hardware that > supports this feature (such as PowerPC) > and is silently ignored on other platforms such as x86. > > This is a resend of the patch; the previous time I sent it > (http://thread.gmane.org/gmane.linux.man/7500) it did not > receive any comments. > > > Signed-off-by: Vince Weaver > > diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2 > index 39c8d8c..665aa31 100644 > --- a/man2/perf_event_open.2 > +++ b/man2/perf_event_open.2 > @@ -856,10 +856,9 @@ If this bit is set, the count excludes events that happen in kernel-space. > .IR "exclude_hv" > If this bit is set, the count excludes events that happen in the > hypervisor. > -This is mainly for PMUs that have built-in support for handling this > -(such as POWER). > -Extra support is needed for handling hypervisor measurements on most > -machines. > +This is mainly for PMUs that have built-in hardware support > +for this feature (such as POWER; this setting is silently > +ignored on x86). > .TP > .IR "exclude_idle" > If set, don't count when the CPU is idle. > -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/