From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758049Ab2BCW2Z (ORCPT ); Fri, 3 Feb 2012 17:28:25 -0500 Received: from mail-iy0-f174.google.com ([209.85.210.174]:44865 "EHLO mail-iy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753614Ab2BCW2X (ORCPT ); Fri, 3 Feb 2012 17:28:23 -0500 Date: Fri, 3 Feb 2012 14:28:18 -0800 From: Tejun Heo To: Vivek Goyal Cc: axboe@kernel.dk, ctalbott@google.com, rni@google.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH UPDATED 11/11] blkcg: unify blkg's for blkcg policies Message-ID: <20120203222818.GG14209@google.com> References: <1328131156-13290-1-git-send-email-tj@kernel.org> <1328131156-13290-12-git-send-email-tj@kernel.org> <20120202003730.GC19837@google.com> <20120203194105.GA12616@redhat.com> <20120203205910.GB14209@google.com> <20120203214435.GC12616@redhat.com> <20120203214719.GE14209@google.com> <20120203215349.GF9683@redhat.com> <20120203221409.GF14209@google.com> <20120203222329.GG9683@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120203222329.GG9683@redhat.com> User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Feb 03, 2012 at 05:23:29PM -0500, Vivek Goyal wrote: > Personally I consider it to be a debugging aid. User space applications > should do what you suggested and that is take delta between certain > periods. > > Frankly speaking I have found it useful though. If I am debugging something, > I don't have to reboot the system to reset the stats and calculating the > difference from zero is easier for humans. There are many things different people may find useful but we shouldn't add userland visible interface with marginal usefulness like this one. Seriously, you can write up a ten line python script to achieve what you want. It's just sad. :( -- tejun