Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1400917 > unrolled thread

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

Back to article view | Back to linux.kernel

This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by below is the oldest one visible, not the original post.

Contents

  Re: [PATCH 2/3] memory-hotplug: more general validation of zone  during online Yasuaki Ishimatsu <yasu.isimatu@gmail.com> - 2016-05-13 19:30 +0200

#1400917 — 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@linux.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@linux.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
> 
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> the body to majordomo@kvack.org.  For more info on Linux MM,
> see: http://www.linux-mm.org/ .
> Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>

[toc] | [standalone]

Back to top | Article view | linux.kernel

csiph-web