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Date: Wed, 16 Jan 2013 17:01:23 -0500 From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> To: akpm@...ux-foundation.org CC: isimatu.yasuaki@...fujitsu.com, tony.luck@...el.com, hpa@...or.com, tangchen@...fujitsu.com, jiang.liu@...wei.com, wujianguo@...wei.com, wency@...fujitsu.com, laijs@...fujitsu.com, linfeng@...fujitsu.com, yinghai@...nel.org, rob@...dley.net, kosaki.motohiro@...fujitsu.com, minchan.kim@...il.com, mgorman@...e.de, rientjes@...gle.com, guz.fnst@...fujitsu.com, rusty@...tcorp.com.au, lliubbo@...il.com, jaegeuk.hanse@...il.com, glommer@...allels.com, linux-kernel@...r.kernel.org, linux-mm@...ck.org Subject: Re: [PATCH v5 0/5] Add movablecore_map boot option On 1/16/2013 4:29 PM, Andrew Morton wrote: > On Wed, 16 Jan 2013 15:25:44 +0900 > Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com> wrote: > >>> >>> Things I'm wondering: >>> >>> - is there *really* a case for retaining the boot option if/when >>> SRAT support is available? >> >> Yes. If SRAT support is available, all memory which enabled hotpluggable >> bit are managed by ZONEMOVABLE. But performance degradation may >> occur by NUMA because we can only allocate anonymous page and page-cache >> from these memory. >> >> In this case, if user cannot change SRAT information, user needs a way to >> select/set removable memory manually. > > If I understand this correctly you mean that once SRAT parsing is > implemented, the user can use movablecore_map to override that SRAT > parsing, yes? That movablecore_map will take precedence over SRAT? I think movablecore_map (I prefer movablemem than it, btw) should behave so. because of, for past three years, almost all memory hotplug bug was handled only I and kamezawa-san and, afaik, both don't have hotremove aware specific hardware. So, if the new feature require specific hardware, we can't maintain this area any more. -- 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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