From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with SMTP id 0CEA66B01F5 for ; Tue, 20 Apr 2010 20:29:04 -0400 (EDT) Received: from m1.gw.fujitsu.co.jp ([10.0.50.71]) by fgwmail6.fujitsu.co.jp (Fujitsu Gateway) with ESMTP id o3L0T2uA028066 for (envelope-from kamezawa.hiroyu@jp.fujitsu.com); Wed, 21 Apr 2010 09:29:02 +0900 Received: from smail (m1 [127.0.0.1]) by outgoing.m1.gw.fujitsu.co.jp (Postfix) with ESMTP id 758F045DE52 for ; Wed, 21 Apr 2010 09:29:01 +0900 (JST) Received: from s1.gw.fujitsu.co.jp (s1.gw.fujitsu.co.jp [10.0.50.91]) by m1.gw.fujitsu.co.jp (Postfix) with ESMTP id 93AC345DE4F for ; Wed, 21 Apr 2010 09:28:58 +0900 (JST) Received: from s1.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s1.gw.fujitsu.co.jp (Postfix) with ESMTP id 7C3AE1DB803A for ; Wed, 21 Apr 2010 09:28:58 +0900 (JST) Received: from m107.s.css.fujitsu.com (m107.s.css.fujitsu.com [10.249.87.107]) by s1.gw.fujitsu.co.jp (Postfix) with ESMTP id 2CA661DB804B for ; Wed, 21 Apr 2010 09:28:55 +0900 (JST) Date: Wed, 21 Apr 2010 09:25:02 +0900 From: KAMEZAWA Hiroyuki Subject: Re: repost - RFC [Patch] Remove "please try 'cgroup_disable=memory' option if you don't want memory cgroups" printk at boot time. Message-Id: <20100421092502.787371b5.kamezawa.hiroyu@jp.fujitsu.com> In-Reply-To: <1271773587.28748.134.camel@dhcp-100-19-198.bos.redhat.com> References: <1271773587.28748.134.camel@dhcp-100-19-198.bos.redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Larry Woodman Cc: "linux-kernel@vger.kernel.org" , linux-mm@kvack.org List-ID: On Tue, 20 Apr 2010 10:26:27 -0400 Larry Woodman wrote: > Re-posting, cc'ing linux-mm as requested: > > We are considering removing this printk at boot time from RHEL because > it will confuse customers, encourage them to change the boot parameters > and generate extraneous support calls. Its documented in > Documentation/kernel-parameters.txt anyway. Any thoughts??? > > Larry Woodman > For RHEL, I agree removing the message makes sense. But I'm unsure that small machine users, who never use memcg, can notice some amount of memory are eaten at boot time. Many distro tends to enable memcg by default and consume memory. printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage); - printk(KERN_INFO "please try 'cgroup_disable=memory' option if you" - " don't want memory cgroups\n"); Hmm. printk(KERN_INFO "If you don't want page_cgroup, you can disable this by boot option, cgroup_disable=memory".) My biggest concern is that we don't have man(5) cgroup as other file systems. If we have man(5), the best place for this kind of information will be it. I think most of users will never see kernel-parameter.txt .. If usual distros are shipped with man(5) cgroup, I agree removing this in upstream. (We have man pages for libcgroup but not man(5) for cgroup file system.) I'm sorry if I don't notice that the latest man package has cgroup section. Bye, -Kame -- 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