From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx189.postini.com [74.125.245.189]) by kanga.kvack.org (Postfix) with SMTP id A0C546B0068 for ; Wed, 24 Oct 2012 18:00:51 -0400 (EDT) From: "Rafael J. Wysocki" 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> 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: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: Borislav Petkov , Dave Hansen , Michal Hocko , linux-mm@kvack.org, KAMEZAWA Hiroyuki , KOSAKI Motohiro , LKML 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. -- 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