Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752247AbbKPPhW (ORCPT ); Mon, 16 Nov 2015 10:37:22 -0500 Received: from bombadil.infradead.org ([198.137.202.9]:58253 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751687AbbKPPhS (ORCPT ); Mon, 16 Nov 2015 10:37:18 -0500 Date: Mon, 16 Nov 2015 16:37:11 +0100 From: Peter Zijlstra To: Marcelo Tosatti Cc: Luiz Capitulino , Thomas Gleixner , Vikas Shivappa , Tejun Heo , Yu Fenghua , linux-kernel@vger.kernel.org Subject: Re: [PATCH RFC] ioctl based CAT interface Message-ID: <20151116153711.GV17308@twins.programming.kicks-ass.net> References: <20151113163933.GA10222@amt.cnet> <20151113165100.GI17308@twins.programming.kicks-ass.net> <20151113173303.GB13490@amt.cnet> <20151116090756.GM17308@twins.programming.kicks-ass.net> <20151116143708.GA26877@amt.cnet> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20151116143708.GA26877@amt.cnet> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 759 Lines: 19 On Mon, Nov 16, 2015 at 12:37:08PM -0200, Marcelo Tosatti wrote: > - position in bitmask represents nothing other than identification of > reservation and size, so: > > group-A = 0x3F, group-B = 0xFF > is the same as > group-A = 0xFC, group-B = 0xFF No, the position very much matters; maybe not in this example, but it does the moment you get overlapping bitmaps. Picking which bits overlap determines which other groups are affected. This is why a bitmap is more expressive than a single percentage. -- 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/