From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758418Ab2J2KCJ (ORCPT ); Mon, 29 Oct 2012 06:02:09 -0400 Received: from cantor2.suse.de ([195.135.220.15]:49554 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758169Ab2J2KCI (ORCPT ); Mon, 29 Oct 2012 06:02:08 -0400 Date: Mon, 29 Oct 2012 11:01:59 +0100 (CET) From: Jiri Kosina To: Borislav Petkov Cc: Andrew Morton , "Rafael J. Wysocki" , Dave Hansen , Michal Hocko , linux-mm@kvack.org, KAMEZAWA Hiroyuki , KOSAKI Motohiro , LKML Subject: Re: [PATCH] add some drop_caches documentation and info messsge In-Reply-To: <20121029095819.GA4326@liondog.tnic> Message-ID: References: <20121012125708.GJ10110@dhcp22.suse.cz> <20121024210600.GA17037@liondog.tnic> <20121024141303.0797d6a1.akpm@linux-foundation.org> <1787395.7AzIesGUbB@vostro.rjw.lan> <20121024181752.de011615.akpm@linux-foundation.org> <20121029095819.GA4326@liondog.tnic> User-Agent: Alpine 2.00 (LNX 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 29 Oct 2012, Borislav Petkov wrote: > > You might or might not want to do that. Dropping caches around suspend > > makes the hibernation process itself faster, but the realtime response > > of the applications afterwards is worse, as everything touched by user > > has to be paged in again. > > Right, do you know of a real use-case where people hibernate, then > resume and still care about applications response time right afterwards? Well if the point of dropping caches is lowering the resume time, then the point is rendered moot as soon as you switch to your browser and have to wait noticeable amount of time until it starts reacting. -- Jiri Kosina SUSE Labs