From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail144.messagelabs.com (mail144.messagelabs.com [216.82.254.51]) by kanga.kvack.org (Postfix) with SMTP id 18A226B004D for ; Fri, 10 Jul 2009 10:50:55 -0400 (EDT) Date: Fri, 10 Jul 2009 17:16:10 +0200 From: Andrea Arcangeli Subject: Re: [RFC][PATCH 0/4] ZERO PAGE again v2 Message-ID: <20090710151610.GB356@random.random> References: <20090707165101.8c14b5ac.kamezawa.hiroyu@jp.fujitsu.com> <20090707084750.GX2714@wotan.suse.de> <20090707180629.cd3ac4b6.kamezawa.hiroyu@jp.fujitsu.com> <20090708173206.GN356@random.random> <20090710134228.GX356@random.random> <9f3ffbd617047982a7aed71548a34f13.squirrel@webmail-b.css.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <9f3ffbd617047982a7aed71548a34f13.squirrel@webmail-b.css.fujitsu.com> Sender: owner-linux-mm@kvack.org To: KAMEZAWA Hiroyuki Cc: Hugh Dickins , Nick Piggin , "linux-mm@kvack.org" , avi@redhat.com, akpm@linux-foundation.org, torvalds@linux-foundation.org List-ID: On Fri, Jul 10, 2009 at 11:12:38PM +0900, KAMEZAWA Hiroyuki wrote: > BTW, ksm has no refcnt pingpong problem ? Well sure it has, the refcount has to be increased when pages are shared, just like for regular fork() on anonymous memory, but the point is that you pay for it only when you're saving ram, so the probability that is just pure overhead is lower than for the zero page... it always depend on the app. I simply suggest in trying it... perhaps zero page is way to go for your users.. they should tell, not us... -- 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