From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pekka Enberg Subject: Re: [PATCH] mm: kill kmemcheck Date: Thu, 12 Mar 2015 09:07:36 +0200 Message-ID: <55013B38.6040100@iki.fi> References: <1426074547-21888-1-git-send-email-sasha.levin@oracle.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8"; Format="flowed" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <1426074547-21888-1-git-send-email-sasha.levin@oracle.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linuxppc-dev-bounces+glppe-linuxppc-embedded-2=m.gmane.org@lists.ozlabs.org Sender: "Linuxppc-dev" To: Sasha Levin , linux-kernel@vger.kernel.org Cc: Vladimir Davydov , Geert Uytterhoeven , SUPERH , Catalin Marinas , Will Deacon , Jianyu Zhan , Paul Mackerras , Pavel Machek , Miklos Szeredi , Christoph Lameter , Marek Szyprowski , "open list:GENERIC INCLUDE/A..." , Andi Kleen , Russell King , Jingoo Han , James Morris , Chris Bainbridge , Antti Palosaari , Mel Gorman , Ritesh Harjani , Shaohua Li , Alexander Duyck , Wang Nan , Jiri List-Id: linux-arch.vger.kernel.org SGkgU2FzaGEsCgpPbiAzLzExLzE1IDE6NDMgUE0sIFNhc2hhIExldmluIHdyb3RlOgo+IEFzIGRp c2N1c3NlZCBvbiBMU0YvTU0sIGtpbGwga21lbWNoZWNrLgo+Cj4gS0FTYW4gaXMgYSByZXBsYWNl bWVudCB0aGF0IGlzIGFibGUgdG8gd29yayB3aXRob3V0IHRoZSBsaW1pdGF0aW9uIG9mCj4ga21l bWNoZWNrIChzaW5nbGUgQ1BVLCBzbG93KS4gS0FTYW4gaXMgYWxyZWFkeSB1cHN0cmVhbS4KPgo+ IFdlIGFyZSBhbHNvIG5vdCBhd2FyZSBvZiBhbnkgdXNlcnMgb2Yga21lbWNoZWNrIChvciB1c2Vy cyB3aG8gZG9uJ3QgY29uc2lkZXIKPiBLQVNhbiBhcyBhIHN1aXRhYmxlIHJlcGxhY2VtZW50KS4K Pgo+IEkndmUgYnVpbGQgdGVzdGVkIGl0IHVzaW5nIGFsbFt5ZXMsbm8sbW9kXWNvbmZpZyBhbmQg ZnV6emVkIGEgYml0IHdpdGggdGhpcwo+IHBhdGNoIGFwcGxpZWQsIGRpZG4ndCBub3RpY2UgYW55 IGJhZCBiZWhhdmlvdXIuCj4KPiBTaWduZWQtb2ZmLWJ5OiBTYXNoYSBMZXZpbiA8c2FzaGEubGV2 aW5Ab3JhY2xlLmNvbT4KCkNhbiB5b3UgZWxhYm9yYXRlIG9uIHdoYXQgZXhhY3RseSB3YXMgZGlz Y3Vzc2VkIGF0IExTRi9NTT8gUHJlZmVyYWJseSBpbiAKdGhlIGNvbW1pdCBsb2cuIDstKQoKLSBQ ZWtrYQpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpMaW51 eHBwYy1kZXYgbWFpbGluZyBsaXN0CkxpbnV4cHBjLWRldkBsaXN0cy5vemxhYnMub3JnCmh0dHBz Oi8vbGlzdHMub3psYWJzLm9yZy9saXN0aW5mby9saW51eHBwYy1kZXY= From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from out2-smtp.messagingengine.com (out2-smtp.messagingengine.com [66.111.4.26]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id AD90E1A018B for ; Thu, 12 Mar 2015 18:18:03 +1100 (AEDT) Received: from compute4.internal (compute4.nyi.internal [10.202.2.44]) by mailout.nyi.internal (Postfix) with ESMTP id 3035020486 for ; Thu, 12 Mar 2015 03:07:59 -0400 (EDT) Message-ID: <55013B38.6040100@iki.fi> Date: Thu, 12 Mar 2015 09:07:36 +0200 From: Pekka Enberg MIME-Version: 1.0 To: Sasha Levin , linux-kernel@vger.kernel.org Subject: Re: [PATCH] mm: kill kmemcheck References: <1426074547-21888-1-git-send-email-sasha.levin@oracle.com> In-Reply-To: <1426074547-21888-1-git-send-email-sasha.levin@oracle.com> Content-Type: text/plain; charset=windows-1252; format=flowed Cc: Vladimir Davydov , Geert Uytterhoeven , SUPERH , Catalin Marinas , Will Deacon , Jianyu Zhan , Paul Mackerras , Pavel Machek , Miklos Szeredi , Christoph Lameter , Marek Szyprowski , "open list:GENERIC INCLUDE/A..." , Andi Kleen , Russell King , Jingoo Han , James Morris , Chris Bainbridge , Antti Palosaari , Mel Gorman , Ritesh Harjani , Shaohua Li , Alexander Duyck , Wang Nan , Jiri Pirko , Daniel J Blueman , Rusty Russell , Jens Axboe , Alexander Viro , Thomas Gleixner , Konstantin Khlebnikov , Willem de Bruijn , Greg Kroah-Hartman , Randy Dunlap , "Rafael J. Wysocki" , Rabin Vincent , "Aneesh Kumar K.V" , Jiri Kosina , Tejun Heo , Andrew Morton , Patrick McHardy , Christoffer Dall , Mark Rutland , DOCUMENTATION , Dave Hansen , Eric Dumazet , Jungseung Lee , Masami Hiramatsu , Stephen Rothwell , Qiaowei Ren , Prarit Bhargava , bob picco , Sungjinn Chung , Quentin Lambert , Hugh Dickins , Yasuaki Ishimatsu , Kukjin Kim , Pranith Kumar , Tom Herbert , CRYPTO API , Rik van Riel , Johannes Berg , Mauro Carvalho Chehab , Eyal Perry , Joe Perches , chishanmingshen , Cyrill Gorcunov , Boris Ostrovsky , Yinghai Lu , Steven Honeyman , ARM PORT , Theodore Ts'o , Pekka Enberg , David Vrabel , David Rientjes , Joonsoo Kim , Michal Hocko , Paul Gortmaker , Jan Beulich , "moderated list:OPENRISC ARCHITEC..." , Guan Xuetao , Sam Ravnborg , Jonathan Corbet , Andrey Ryabinin , Dexuan Cui , Vegard Nossum , Alexey Kuznetsov , "Paul E. McKenney" , Fenghua Yu , Kees Cook , Arnd Bergmann , Suresh Siddha , Josh Triplett , Steven Rostedt , Borislav Petkov , Andrey Konovalov , Scott Wood , Bryan O'Donoghue , Dan Streetman , Oleg Nesterov , Andy Lutomirski , Hannes Frederic Sowa , linux-fsdevel@vger.kernel.org, "David S. Miller" , "Kirill A. Shutemov" , "Michael S. Tsirkin" , Peter Zijlstra , MEMORY MANAGEMENT , Davidlohr Bueso , Paul Cassella , "H. Peter Anvin" , "open list:SPARC + UltraSPAR..." , Xishi Qiu , Alexei Starovoitov , Jonas Bonn , Herbert Xu , Richard Weinberger , "maintainer:X86 ARCHITECTURE..." , Ingo Molnar , Aaron Tomlin , Greg Thelen , "Eric W. Biederman" , Konrad Rzeszutek Wilk , Fabian Frederick , Michal Marek , Jungseok Lee , Dave Jones , Andy Shevchenko , Vlastimil Babka , Juergen Gross , Hideaki YOSHIFUJI , "open list:NETWORKING \[GENERAL\]" , Daniel Borkmann , Horia Geanta , Johannes Weiner , "open list:LINUX FOR POWERPC..." , Anton Blanchard List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Hi Sasha, On 3/11/15 1:43 PM, Sasha Levin wrote: > As discussed on LSF/MM, kill kmemcheck. > > KASan is a replacement that is able to work without the limitation of > kmemcheck (single CPU, slow). KASan is already upstream. > > We are also not aware of any users of kmemcheck (or users who don't consider > KASan as a suitable replacement). > > I've build tested it using all[yes,no,mod]config and fuzzed a bit with this > patch applied, didn't notice any bad behaviour. > > Signed-off-by: Sasha Levin Can you elaborate on what exactly was discussed at LSF/MM? Preferably in the commit log. ;-) - Pekka