From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx154.postini.com [74.125.245.154]) by kanga.kvack.org (Postfix) with SMTP id 7A5BA8D0001 for ; Fri, 11 May 2012 04:38:26 -0400 (EDT) Message-ID: <4FACD00D.4060003@kernel.org> Date: Fri, 11 May 2012 17:38:37 +0900 From: Minchan Kim MIME-Version: 1.0 Subject: Re: [PATCH] mm: raise MemFree by reverting percpu_pagelist_fraction to 0 References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Sasha Levin Cc: Hugh Dickins , Linus Torvalds , Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org On 05/11/2012 05:30 PM, Sasha Levin wrote: > On Fri, May 11, 2012 at 10:00 AM, Hugh Dickins wrote: >> Commit 93278814d359 "mm: fix division by 0 in percpu_pagelist_fraction()" >> mistakenly initialized percpu_pagelist_fraction to the sysctl's minimum 8, >> which leaves 1/8th of memory on percpu lists (on each cpu??); but most of >> us expect it to be left unset at 0 (and it's not then used as a divisor). > > I'm a bit confused about this, does it mean that once you set > percpu_pagelist_fraction to a value above the minimum, you can no > longer set it back to being 0? Unfortunately, Yes. :( It's rather awkward and need fix. -- Kind regards, Minchan Kim -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org