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Date: Wed, 11 Aug 2010 08:18:52 -0700 From: Dave Hansen <dave@...ux.vnet.ibm.com> To: Nathan Fontenot <nfont@...tin.ibm.com> Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, linuxppc-dev@...abs.org, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>, Greg KH <greg@...ah.com> Subject: Re: [PATCH 0/8] v5 De-couple sysfs memory directories from memory sections On Mon, 2010-08-09 at 12:53 -0500, Nathan Fontenot wrote: > This set of patches de-couples the idea that there is a single > directory in sysfs for each memory section. The intent of the > patches is to reduce the number of sysfs directories created to > resolve a boot-time performance issue. On very large systems > boot time are getting very long (as seen on powerpc hardware) > due to the enormous number of sysfs directories being created. > On a system with 1 TB of memory we create ~63,000 directories. > For even larger systems boot times are being measured in hours. Hi Nathan, The set is looking pretty good to me. We _might_ want to up the ante in the future and allow it to be even more dynamic than this, but this looks like a good start to me. BTW, have you taken a look at what the hotplug events look like if only a single section (not filling up a whole block) is added? Feel free to add my: Acked-by: Dave Hansen <dave@...ux.vnet.ibm.com> -- Dave -- 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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