From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932662AbcGHT0d (ORCPT ); Fri, 8 Jul 2016 15:26:33 -0400 Received: from www.sr71.net ([198.145.64.142]:49118 "EHLO blackbird.sr71.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752537AbcGHT0T (ORCPT ); Fri, 8 Jul 2016 15:26:19 -0400 Subject: Re: [PATCH 6/9] x86, pkeys: add pkey set/get syscalls To: Ingo Molnar References: <20160707124719.3F04C882@viggo.jf.intel.com> <20160707124728.C1116BB1@viggo.jf.intel.com> <20160707144508.GZ11498@techsingularity.net> <577E924C.6010406@sr71.net> <20160708071810.GA27457@gmail.com> Cc: Mel Gorman , linux-kernel@vger.kernel.org, x86@kernel.org, linux-api@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, torvalds@linux-foundation.org, akpm@linux-foundation.org, dave.hansen@linux.intel.com, arnd@arndb.de, hughd@google.com, viro@zeniv.linux.org.uk From: Dave Hansen Message-ID: <577FFE55.7040209@sr71.net> Date: Fri, 8 Jul 2016 12:26:13 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0 MIME-Version: 1.0 In-Reply-To: <20160708071810.GA27457@gmail.com> 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 On 07/08/2016 12:18 AM, Ingo Molnar wrote: > So my hope was that we'd also grow some debugging features: such as a periodic > watchdog timer clearing all non-allocated pkeys of a task and re-setting them to > their (kernel-)known values and thus forcing user-space to coordinate key > allocation/freeing. I'm glad you mentioned this. I've explicitly called out this behavior in the manpages now, or at least called out the fact that the kernel will not preserve PKRU contents for unallocated keys.