From: Glauber Costa <glommer@parallels.com>
To: "Luck, Tony" <tony.luck@intel.com>
Cc: Mel Gorman <mgorman@suse.de>, "H. Peter Anvin" <hpa@zytor.com>,
Jiang Liu <jiang.liu@huawei.com>,
Tang Chen <tangchen@cn.fujitsu.com>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
"rob@landley.net" <rob@landley.net>,
"isimatu.yasuaki@jp.fujitsu.com" <isimatu.yasuaki@jp.fujitsu.com>,
"laijs@cn.fujitsu.com" <laijs@cn.fujitsu.com>,
"wency@cn.fujitsu.com" <wency@cn.fujitsu.com>,
"linfeng@cn.fujitsu.com" <linfeng@cn.fujitsu.com>,
"yinghai@kernel.org" <yinghai@kernel.org>,
"kosaki.motohiro@jp.fujitsu.com" <kosaki.motohiro@jp.fujitsu.com>,
"minchan.kim@gmail.com" <minchan.kim@gmail.com>,
"rientjes@google.com" <rientjes@google.com>,
"rusty@rustcorp.com.au" <rusty@rustcorp.com.au>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
Len Brown <lenb@kernel.org>, "Wang, Frank" <frank.wang@intel.com>
Subject: Re: [PATCH v2 0/5] Add movablecore_map boot option
Date: Fri, 30 Nov 2012 14:19:33 +0400 [thread overview]
Message-ID: <50B88835.80805@parallels.com> (raw)
In-Reply-To: <3908561D78D1C84285E8C5FCA982C28F1C95FF53@ORSMSX108.amr.corp.intel.com>
On 11/30/2012 06:58 AM, Luck, Tony wrote:
>> If any significant percentage of memory is in ZONE_MOVABLE then the memory
>> hotplug people will have to deal with all the lowmem/highmem problems
>> that used to be faced by 32-bit x86 with PAE enabled.
>
> While these problems may still exist on large systems - I think it becomes
> harder to construct workloads that run into problems. In those bad old days
> a significant fraction of lowmem was consumed by the kernel ... so it was
> pretty easy to find meta-data intensive workloads that would push it over
> a cliff. Here we are talking about systems with say 128GB per node divided
> into 64GB moveable and 64GB non-moveable (and I'd regard this as a rather
> low-end machine). Unless the workload consists of zillions of tiny processes
> all mapping shared memory blocks, the percentage of memory allocated to
> the kernel is going to be tiny compared with the old 4GB days.
>
Which is a perfectly common workload for containers, where you can have
hundreds of machines (per node) being sold out to third parties, a lot
of them consuming every single bit of metadata they can.
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next prev parent reply other threads:[~2012-11-30 10:19 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-23 10:44 [PATCH v2 0/5] Add movablecore_map boot option Tang Chen
2012-11-23 10:44 ` [PATCH v2 1/5] x86: get pg_data_t's memory from other node Tang Chen
2012-11-24 1:19 ` Jiang Liu
2012-11-26 1:19 ` Tang Chen
2012-12-02 15:11 ` Jiang Liu
2012-11-23 10:44 ` [PATCH v2 2/5] page_alloc: add movable_memmap kernel parameter Tang Chen
2012-11-23 10:44 ` [PATCH v2 3/5] page_alloc: Introduce zone_movable_limit[] to keep movable limit for nodes Tang Chen
2012-12-05 15:46 ` Jiang Liu
2012-12-06 1:20 ` Tang Chen
2012-11-23 10:44 ` [PATCH v2 4/5] page_alloc: Make movablecore_map has higher priority Tang Chen
2012-12-05 15:43 ` Jiang Liu
2012-12-06 1:26 ` Tang Chen
2012-12-06 2:26 ` Jiang Liu
2012-12-06 2:51 ` Jianguo Wu
2012-12-06 2:57 ` Tang Chen
2012-12-09 8:10 ` Tang Chen
2012-12-10 2:15 ` Jiang Liu
2012-11-23 10:44 ` [PATCH v2 5/5] page_alloc: Bootmem limit with movablecore_map Tang Chen
2012-11-26 12:22 ` wujianguo
2012-11-26 12:53 ` Tang Chen
2012-11-26 12:40 ` wujianguo
2012-11-26 13:15 ` Tang Chen
2012-11-26 15:48 ` H. Peter Anvin
2012-11-27 0:58 ` Jianguo Wu
2012-11-27 3:19 ` Wen Congyang
2012-11-27 3:22 ` Jianguo Wu
2012-11-27 3:34 ` Wen Congyang
2012-11-27 1:12 ` Jiang Liu
2012-11-27 1:20 ` H. Peter Anvin
2012-11-27 3:15 ` Wen Congyang
2012-11-27 5:31 ` H. Peter Anvin
2012-12-06 17:28 ` Jiang Liu
2012-12-06 17:41 ` H. Peter Anvin
2012-12-07 0:18 ` Jiang Liu
2012-12-19 9:17 ` Tang Chen
2012-11-27 3:10 ` [PATCH v2 0/5] Add movablecore_map boot option wujianguo
2012-11-27 5:43 ` Tang Chen
2012-11-27 6:20 ` H. Peter Anvin
2012-11-27 6:47 ` Jianguo Wu
2012-11-28 3:47 ` Tang Chen
2012-11-28 4:01 ` Jiang Liu
2012-11-28 5:21 ` Wen Congyang
2012-11-28 5:17 ` Jiang Liu
2012-11-28 4:53 ` Jianguo Wu
2012-11-27 8:00 ` Bob Liu
2012-11-27 8:29 ` Tang Chen
2012-11-27 8:49 ` H. Peter Anvin
2012-11-27 9:47 ` Wen Congyang
2012-11-27 9:53 ` H. Peter Anvin
2012-11-27 9:59 ` Yasuaki Ishimatsu
2012-11-27 12:09 ` Bob Liu
2012-11-27 12:49 ` Tang Chen
2012-11-28 3:24 ` Bob Liu
2012-11-28 4:08 ` Jiang Liu
2012-11-28 6:16 ` Tang Chen
2012-11-28 7:03 ` Jiang Liu
2012-11-28 8:29 ` Wen Congyang
2012-11-28 8:28 ` Jiang Liu
2012-11-28 8:38 ` Wen Congyang
2012-11-29 0:43 ` Jaegeuk Hanse
2012-11-29 1:24 ` Tang Chen
2012-11-30 9:20 ` Lai Jiangshan
2012-11-28 8:47 ` Jiang Liu
2012-11-28 21:34 ` Luck, Tony
2012-11-28 21:38 ` H. Peter Anvin
2012-11-29 11:00 ` Mel Gorman
2012-11-29 16:07 ` H. Peter Anvin
2012-11-29 22:41 ` Luck, Tony
2012-11-29 22:45 ` H. Peter Anvin
2012-11-30 2:56 ` Jiang Liu
2012-11-30 3:15 ` Yasuaki Ishimatsu
2012-11-30 15:36 ` Jiang Liu
2012-11-30 2:58 ` Luck, Tony
2012-11-30 3:28 ` H. Peter Anvin
2012-11-30 10:19 ` Glauber Costa [this message]
2012-11-30 10:52 ` Mel Gorman
2012-11-29 10:38 ` Yasuaki Ishimatsu
2012-11-29 11:05 ` Mel Gorman
2012-11-29 15:47 ` Jiang Liu
2012-11-29 15:53 ` Jiang Liu
2012-11-29 1:42 ` Jaegeuk Hanse
2012-11-29 2:25 ` Jiang Liu
2012-11-29 2:49 ` Wanpeng Li
2012-11-29 2:59 ` Jiang Liu
2012-11-29 2:49 ` Wanpeng Li
2012-11-30 22:27 ` Toshi Kani
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