linux-kernel - Re: [PATCH] add some drop_caches documentation and info messsge

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Message-ID: <20121029095819.GA4326@liondog.tnic>
Date:	Mon, 29 Oct 2012 10:58:19 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Michal Hocko <mhocko@...e.cz>, linux-mm@...ck.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] add some drop_caches documentation and info messsge

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.
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