From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161360Ab2JXWAw (ORCPT ); Wed, 24 Oct 2012 18:00:52 -0400 Received: from ogre.sisk.pl ([193.178.161.156]:35664 "EHLO ogre.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935420Ab2JXWAv (ORCPT ); Wed, 24 Oct 2012 18:00:51 -0400 From: "Rafael J. Wysocki" To: Andrew Morton Cc: Borislav Petkov , Dave Hansen , Michal Hocko , linux-mm@kvack.org, KAMEZAWA Hiroyuki , KOSAKI Motohiro , LKML Subject: Re: [PATCH] add some drop_caches documentation and info messsge Date: Thu, 25 Oct 2012 00:04:46 +0200 Message-ID: <1787395.7AzIesGUbB@vostro.rjw.lan> User-Agent: KMail/4.8.5 (Linux/3.6.2-6-desktop; KDE/4.8.5; x86_64; ; ) In-Reply-To: <20121024141303.0797d6a1.akpm@linux-foundation.org> References: <20121012125708.GJ10110@dhcp22.suse.cz> <20121024210600.GA17037@liondog.tnic> <20121024141303.0797d6a1.akpm@linux-foundation.org> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="utf-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wednesday 24 of October 2012 14:13:03 Andrew Morton wrote: > On Wed, 24 Oct 2012 23:06:00 +0200 > Borislav Petkov wrote: > > > On Wed, Oct 24, 2012 at 01:48:36PM -0700, Andrew Morton wrote: > > > Well who knows. Could be that people's vm *does* suck. Or they have > > > some particularly peculiar worklosd or requirement[*]. Or their VM > > > *used* to suck, and the drop_caches is not really needed any more but > > > it's there in vendor-provided code and they can't practically prevent > > > it. > > > > I have drop_caches in my suspend-to-disk script so that the hibernation > > image is kept at minimum and suspend times are as small as possible. > > hm, that sounds smart. > > > Would that be a valid use-case? > > I'd say so, unless we change the kernel to do that internally. We do > have the hibernation-specific shrink_all_memory() in the vmscan code. > We didn't see fit to document _why_ that exists, but IIRC it's there to > create enough free memory for hibernation to be able to successfully > complete, but no more. That's correct. > Who owns hibernaton nowadays? Rafael, I guess? I'm still maintaining it. Thanks, Rafael -- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center.