Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753899AbbBKTBm (ORCPT ); Wed, 11 Feb 2015 14:01:42 -0500 Received: from mail-qc0-f169.google.com ([209.85.216.169]:36016 "EHLO mail-qc0-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753050AbbBKTBk (ORCPT ); Wed, 11 Feb 2015 14:01:40 -0500 From: Vince Weaver X-Google-Original-From: Vince Weaver Date: Wed, 11 Feb 2015 14:04:53 -0500 (EST) To: "Michael Kerrisk (man-pages)" cc: linux-man@vger.kernel.org, linux-kernel@vger.kernel.org, Peter Zijlstra , Paul Mackerras , Ingo Molnar , Arnaldo Carvalho de Melo Subject: [patch] perf_event_open.2: Exclude_hv clarification Message-ID: User-Agent: Alpine 2.11 (DEB 23 2013-08-11) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1751 Lines: 47 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. -- 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/