From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756672AbbAHN52 (ORCPT ); Thu, 8 Jan 2015 08:57:28 -0500 Received: from mail.skyhub.de ([78.46.96.112]:59914 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753683AbbAHN51 (ORCPT ); Thu, 8 Jan 2015 08:57:27 -0500 Date: Thu, 8 Jan 2015 14:57:24 +0100 From: Borislav Petkov To: Andy Lutomirski Cc: x86@kernel.org, linux-kernel@vger.kernel.org, =?utf-8?B?RnLDqWTDqXJpYw==?= Weisbecker , Oleg Nesterov , kvm list Subject: Re: [PATCH 2/3] x86_64,entry: Use sysret to return to userspace when possible Message-ID: <20150108135724.GC20632@pd.tnic> References: <49394403b8b12486a6b9c9c70b72bd9f5dce7364.1415403984.git.luto@amacapital.net> <20150108122928.GB20632@pd.tnic> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20150108122928.GB20632@pd.tnic> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jan 08, 2015 at 01:29:28PM +0100, Borislav Petkov wrote: > Ok, dammit, it happened again: Running -rc+ 2without your first two patches doesn't trigger it. Well, I don't know what workload even triggered it, it used to happen during system upgrade. I left the box without your patches to build the kernel in a loop and went to lunch. Now I'm back and it all still looks good. I'll try running only with this second patch, i.e. the ret-to-user SYSRET speedup thing. See what happens. -- Regards/Gruss, Boris. Sent from a fat crate under my desk. Formatting is fine. --