linux-kernel - Re: [PATCH 2/3] memory-hotplug: more general validation of zone during online

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Date:	Fri, 13 May 2016 10:24:52 -0700 (PDT)
From:	Yasuaki Ishimatsu <yasu.isimatu@...il.com>
To:	Reza Arbab <arbab@...ux.vnet.ibm.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Kiper <daniel.kiper@...cle.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Tang Chen <tangchen@...fujitsu.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	David Vrabel <david.vrabel@...rix.com>,
	Vitaly Kuznetsov <vkuznets@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Andrew Banman <abanman@....com>,
	Chen Yucong <slaoub@...il.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
Subject: Re: [PATCH 2/3] memory-hotplug: more general validation of zone
 during online


On Wed, 11 May 2016 14:23:26 -0500
Reza Arbab <arbab@...ux.vnet.ibm.com> wrote:

> On Wed, May 11, 2016 at 08:17:41AM -0700, Yasuaki Ishimatsu wrote:
> >On Tue, 10 May 2016 15:39:43 -0500
> >Reza Arbab <arbab@...ux.vnet.ibm.com> wrote:
> ><snip>
> >> +	if (idx < target) {
> >> +		/* pages must be at end of current zone */
> >> +		if (pfn + nr_pages != zone_end_pfn(zone))
> >> +			return 0;
> ><snip>
> >> +	if (target < idx) {
> >> +		/* pages must be at beginning of current zone */
> >> +		if (pfn != zone->zone_start_pfn)
> >> +			return 0;
> >
> >According your patch, memory address must be continuous for changing zone.
> >So if memory address is uncontinuous as follows, memory address 0x180000000-0x1FFFFFFFF
> >can be changed from ZONE_NORMAL to ZONE_MOVABLE. But memory address 0x80000000-0xFFFFFFFF
> >can not be changed from ZONE_NORMAL to ZONE_MOVABLE since it does not meet
> >above condition.
> >
> >Memory address
> >  0x80000000 -  0xFFFFFFFF
> > 0x180000000 - 0x1FFFFFFFF
> 
> Ah, I see. What do you think of this instead?
> 
> <snip>
> +	if (idx < target) {
> +		/* must be the last pages present in current zone */
> +		for (i = pfn + nr_pages; i < zone_end_pfn(zone); i++)
> +			if (pfn_present(i))
> +				return 0;
> <snip>
> +	if (target < idx) {
> +		/* must be the first pages present in current zone */
> +		for (i = zone->zone_start_pfn; i < pfn; i++)
> +			if (pfn_present(i))
> +				return 0;
> 
> -- 

Ahh, sorry. I completely misread your patch. And I understood that
you don't need to change your first patch.

Thank,
Yasuaki Ishimatsu

> Reza Arbab
> 
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