linux-kernel - Re: [ACPIHP PATCH part1 0/4] introduce a framework for ACPI based system device hotplug

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Date:	Mon, 19 Nov 2012 14:19:19 -0700
From:	Toshi Kani <toshi.kani@...com>
To:	Jiang Liu <liuj97@...il.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Yinghai Lu <yinghai@...nel.org>,
	Tony Luck <tony.luck@...el.com>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Wen Congyang <wency@...fujitsu.com>,
	Tang Chen <tangchen@...fujitsu.com>,
	Taku Izumi <izumi.taku@...fujitsu.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Jiang Liu <jiang.liu@...wei.com>,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Huang Ying <ying.huang@...el.com>,
	Bob Moore <robert.moore@...el.com>,
	Len Brown <lenb@...nel.org>,
	"Srivatsa S . Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Yijing Wang <wangyijing@...wei.com>,
	Hanjun Guo <guohanjun@...wei.com>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-mm@...ck.org,
	"Wang, Frank" <frank.wang@...el.com>
Subject: Re: [ACPIHP PATCH part1 0/4] introduce a framework for ACPI based
 system device hotplug

> But for the ACPI part for CPU and memory hotplug enhancements recently posted to
> the community, I think they are different solutions with the new framework. I feel
> they are lightweight enhancements to existing code with some limitations, but the
> new framework is a heavyweight solution with full functionalities and improved
> usability. So we may need discussions about the different solutions here:)

Hi Gerry,

Thanks for working on the framework enhancement.  I am still new to
Linux (and learning :), but have extensive background in hot-plug
features on other OS for CPU, Memory, Node, RP and PCI hot-plug support.
So, I basically agree with you that we do need framework enhancement.
However, I think we need phased approach here.  First, we need to make
CPU and Memory hot-plug work under the current framework.  Once we
settle on the basic features, we can then make framework enhancements
without breaking the features.  For CPU hotplug, I also intentionally
minimized the code changes so that the changes could be back-ported to
older kernels being used by distributions.

I will send you more comments after I reviewed your patches (which may
take some time :).

Thanks,
-Toshi

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