From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sebastian Andrzej Siewior Subject: Re: [PATCH RT 4/5] allow preemption in mem_cgroup_move_account_page_stat Date: Fri, 14 Feb 2014 14:19:59 +0100 Message-ID: <20140214131959.GG28438@linutronix.de> References: <20140210153933.GE20017@opentech.at> <20140214131705.GF28438@linutronix.de> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: linux-rt-users@vger.kernel.org, LKML , Steven Rostedt , Peter Zijlstra , Carsten Emde , Thomas Gleixner , Andreas Platschek To: Nicholas Mc Guire Return-path: Content-Disposition: inline In-Reply-To: <20140214131705.GF28438@linutronix.de> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-rt-users.vger.kernel.org * Sebastian Andrzej Siewior | 2014-02-14 14:17:05 [+0100]: >Now, that I look at it again. Isn't it more efficient to keep preempti= on >disabled for this very short time instead instead of invoking >migrate_disable() which includes preempt_disable()/enable() and a few >more opcodes=E2=80=A6 >Therefore, I drop it again. I think doing the same for the 1/5 of this series since it also disable= s migration for a handfull of asm opcodes. Sebastian