From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx167.postini.com [74.125.245.167]) by kanga.kvack.org (Postfix) with SMTP id 9E1C96B006C for ; Mon, 29 Oct 2012 05:58:22 -0400 (EDT) Date: Mon, 29 Oct 2012 10:58:19 +0100 From: Borislav Petkov Subject: Re: [PATCH] add some drop_caches documentation and info messsge Message-ID: <20121029095819.GA4326@liondog.tnic> 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> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org List-ID: To: Jiri Kosina Cc: Andrew Morton , "Rafael J. Wysocki" , Dave Hansen , Michal Hocko , linux-mm@kvack.org, KAMEZAWA Hiroyuki , KOSAKI Motohiro , LKML On Mon, Oct 29, 2012 at 09:59:59AM +0100, Jiri Kosina 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? Besides, once everything is swapped back in, perf. is back to normal, i.e. like before suspending. Thanks. -- Regards/Gruss, Boris. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758380Ab2J2J6Z (ORCPT ); Mon, 29 Oct 2012 05:58:25 -0400 Received: from mail.skyhub.de ([78.46.96.112]:50044 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758123Ab2J2J6X (ORCPT ); Mon, 29 Oct 2012 05:58:23 -0400 Date: Mon, 29 Oct 2012 10:58:19 +0100 From: Borislav Petkov To: Jiri Kosina 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 Message-ID: <20121029095819.GA4326@liondog.tnic> Mail-Followup-To: Borislav Petkov , Jiri Kosina , Andrew Morton , "Rafael J. Wysocki" , Dave Hansen , Michal Hocko , linux-mm@kvack.org, KAMEZAWA Hiroyuki , KOSAKI Motohiro , LKML 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> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Oct 29, 2012 at 09:59:59AM +0100, Jiri Kosina 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? Besides, once everything is swapped back in, perf. is back to normal, i.e. like before suspending. Thanks. -- Regards/Gruss, Boris.