From: "H. Peter Anvin" <hpa@zytor.com>
To: "Luck, Tony" <tony.luck@intel.com>
Cc: 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>,
"mgorman@suse.de" <mgorman@suse.de>,
"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: Wed, 28 Nov 2012 13:38:47 -0800 [thread overview]
Message-ID: <50B68467.5020008@zytor.com> (raw)
In-Reply-To: <3908561D78D1C84285E8C5FCA982C28F1C95EDCE@ORSMSX108.amr.corp.intel.com>
On 11/28/2012 01:34 PM, Luck, Tony wrote:
>>
>> 2. use boot option
>> This is our proposal. New boot option can specify memory range to use
>> as movable memory.
>
> Isn't this just moving the work to the user? To pick good values for the
> movable areas, they need to know how the memory lines up across
> node boundaries ... because they need to make sure to allow some
> non-movable memory allocations on each node so that the kernel can
> take advantage of node locality.
>
> So the user would have to read at least the SRAT table, and perhaps
> more, to figure out what to provide as arguments.
>
> Since this is going to be used on a dynamic system where nodes might
> be added an removed - the right values for these arguments might
> change from one boot to the next. So even if the user gets them right
> on day 1, a month later when a new node has been added, or a broken
> node removed the values would be stale.
>
I gave this feedback in person at LCE: I consider the kernel
configuration option to be useless for anything other than debugging.
Trying to promote it as an actual solution, to be used by end users in
the field, is ridiculous at best.
-hpa
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next prev parent reply other threads:[~2012-11-28 21:39 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 [this message]
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
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 2:49 ` Wanpeng Li
2012-11-29 2:59 ` Jiang Liu
2012-11-30 22:27 ` Toshi Kani
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