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Date: Thu, 1 Apr 2010 10:48:59 +0900 From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> To: Rik van Riel <riel@...hat.com> Cc: Larry Woodman <lwoodman@...hat.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>, "kamezawa.hiroyu@...fujitsu.com" <kamezawa.hiroyu@...fujitsu.com>, "nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>, "akpm@...ux-foundation.org" <akpm@...ux-foundation.org> Subject: Re: RFC [Patch] Remove "please try 'cgroup_disable=memory' option if you don't want memory cgroups" printk at boot time. On Wed, 31 Mar 2010 13:57:46 -0400 Rik van Riel <riel@...hat.com> wrote: > On 03/31/2010 11:54 AM, Larry Woodman wrote: > > On Wed, 2010-03-31 at 11:28 -0400, Larry Woodman wrote: > >> 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??? > > Yeah, that is a strange boot message... > > Acked-by: Rik van Riel <riel@...hat.com> > please CC linux-mm and maintainers. Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> It have been there for a year and I think memory usage by page_cgroup will not surprise linux kernel users, more. Assume x86-32. RHEL allows amount of memory up to 16G, right? without memcg: memmap uses 32bytes * 16G/4k = 128M. with memcg: memmap+page_cgroup uses (32+20) bytes * 16G/4k = 208M. I thought this may cause OOM in ZONE_NORMAL. Then, I added it when I wrote original patch. This kind of memory eater can cause trouble when it pops up suddenly. But I think 'one year' can be an excuse. Thanks, -Kame -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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