Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754228Ab1ECRR5 (ORCPT ); Tue, 3 May 2011 13:17:57 -0400 Received: from mga02.intel.com ([134.134.136.20]:54134 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754130Ab1ECRR4 convert rfc822-to-8bit (ORCPT ); Tue, 3 May 2011 13:17:56 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.64,310,1301900400"; d="scan'208";a="637287485" From: "Luck, Tony" To: Borislav Petkov , Ingo Molnar CC: Peter Zijlstra , Arnaldo Carvalho de Melo , Steven Rostedt , Frederic Weisbecker , Mauro Carvalho Chehab , EDAC devel , LKML , "Petkov, Borislav" Date: Tue, 3 May 2011 10:17:50 -0700 Subject: RE: [PATCH 4/4] x86, mce: Have MCE persistent event off by default for now Thread-Topic: [PATCH 4/4] x86, mce: Have MCE persistent event off by default for now Thread-Index: AcwJYwQ5zzi0x4R8QjSENsTdfI1XIwAUjDag Message-ID: <987664A83D2D224EAE907B061CE93D5301C53670E0@orsmsx505.amr.corp.intel.com> References: <1304357691-14354-1-git-send-email-bp@amd64.org> <1304357691-14354-5-git-send-email-bp@amd64.org> <20110503064505.GF7751@elte.hu> <20110503072302.GC18979@aftab> In-Reply-To: <20110503072302.GC18979@aftab> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 944 Lines: 21 > Ok, the problem I see with it is that people without a RAS daemon > running will have the mechanism collecting MCEs in the background, using > up resources (4 pages per CPU is the buffer) and not doing anything (in > the best case that is, when we're not broken otherwise). Can the kernel detect whether anyone is listening to the persistent MCE event? If so, then the kernel could printk() something to let the user with no RAS daemon (or a dead daemon) that stuff is happening that they might like to know about. Probably make some sense to delay such a message (so that in the boot case we give the daemon a chance to get started before complaining that it hasn't shown up for work). -Tony -- 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/