Subject: Re: [PATCH v2 10/12] memory-hotplug: memory_hotplug: clear zone when removing the memory

From: Jianguo Wu <[email-masked]>
Date: Mon, 29 Oct 2012 23:34:31 +0800

On 2012/10/23 18:30, [email-masked] wrote:
> From: Yasuaki Ishimatsu <[email-masked]>
> 
> When a memory is added, we update zone's and pgdat's start_pfn and
> spanned_pages in the function __add_zone(). So we should revert them
> when the memory is removed.
> 
> The patch adds a new function __remove_zone() to do this.
> 
> CC: David Rientjes <[email-masked]>
> CC: Jiang Liu <[email-masked]>
> CC: Len Brown <[email-masked]>
> CC: Christoph Lameter <[email-masked]>
> Cc: Minchan Kim <[email-masked]>
> CC: Andrew Morton <[email-masked]>
> CC: KOSAKI Motohiro <[email-masked]>
> Signed-off-by: Yasuaki Ishimatsu <[email-masked]>
> Signed-off-by: Wen Congyang <[email-masked]>
> ---
>  mm/memory_hotplug.c |  207 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 files changed, 207 insertions(+), 0 deletions(-)
> 
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index 03153cf..55a228d 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -312,10 +312,213 @@ static int __meminit __add_section(int nid, struct zone *zone,
>  	return register_new_memory(nid, __pfn_to_section(phys_start_pfn));
>  }
>  
> +/* find the smallest valid pfn in the range [start_pfn, end_pfn) */
> +static int find_smallest_section_pfn(int nid, struct zone *zone,
> +				     unsigned long start_pfn,
> +				     unsigned long end_pfn)
> +{
> +	struct mem_section *ms;
> +
> +	for (; start_pfn < end_pfn; start_pfn += PAGES_PER_SECTION) {
> +		ms = __pfn_to_section(start_pfn);
> +
> +		if (unlikely(!valid_section(ms)))
> +			continue;
> +
> +		if (unlikely(pfn_to_nid(start_pfn)) != nid)

if (unlikely(pfn_to_nid(start_pfn) != nid))

> +			continue;
> +
> +		if (zone && zone != page_zone(pfn_to_page(start_pfn)))
> +			continue;
> +
> +		return start_pfn;
> +	}
> +
> +	return 0;
> +}
> +
> +/* find the biggest valid pfn in the range [start_pfn, end_pfn). */
> +static int find_biggest_section_pfn(int nid, struct zone *zone,
> +				    unsigned long start_pfn,
> +				    unsigned long end_pfn)
> +{
> +	struct mem_section *ms;
> +	unsigned long pfn;
> +
> +	/* pfn is the end pfn of a memory section. */
> +	pfn = end_pfn - 1;
> +	for (; pfn >= start_pfn; pfn -= PAGES_PER_SECTION) {
> +		ms = __pfn_to_section(pfn);
> +
> +		if (unlikely(!valid_section(ms)))
> +			continue;
> +
> +		if (unlikely(pfn_to_nid(pfn)) != nid)

if (unlikely(pfn_to_nid(pfn) != nid))

> +			continue;
> +
> +		if (zone && zone != page_zone(pfn_to_page(pfn)))
> +			continue;
> +
> +		return pfn;
> +	}
> +
> +	return 0;
> +}
> +
> +static void shrink_zone_span(struct zone *zone, unsigned long start_pfn,
> +			     unsigned long end_pfn)
> +{
> +	unsigned long zone_start_pfn =  zone->zone_start_pfn;
> +	unsigned long zone_end_pfn = zone->zone_start_pfn + zone->spanned_pages;
> +	unsigned long pfn;
> +	struct mem_section *ms;
> +	int nid = zone_to_nid(zone);
> +
> +	zone_span_writelock(zone);
> +	if (zone_start_pfn == start_pfn) {
> +		/*
> +		 * If the section is smallest section in the zone, it need
> +		 * shrink zone->zone_start_pfn and zone->zone_spanned_pages.
> +		 * In this case, we find second smallest valid mem_section
> +		 * for shrinking zone.
> +		 */
> +		pfn = find_smallest_section_pfn(nid, zone, end_pfn,
> +						zone_end_pfn);
> +		if (pfn) {
> +			zone->zone_start_pfn = pfn;
> +			zone->spanned_pages = zone_end_pfn - pfn;
> +		}
> +	} else if (zone_end_pfn == end_pfn) {
> +		/*
> +		 * If the section is biggest section in the zone, it need
> +		 * shrink zone->spanned_pages.
> +		 * In this case, we find second biggest valid mem_section for
> +		 * shrinking zone.
> +		 */
> +		pfn = find_biggest_section_pfn(nid, zone, zone_start_pfn,
> +					       start_pfn);
> +		if (pfn)
> +			zone->spanned_pages = pfn - zone_start_pfn + 1;
> +	}
> +
> +	/*
> +	 * The section is not biggest or smallest mem_section in the zone, it
> +	 * only creates a hole in the zone. So in this case, we need not
> +	 * change the zone. But perhaps, the zone has only hole data. Thus
> +	 * it check the zone has only hole or not.
> +	 */
> +	pfn = zone_start_pfn;
> +	for (; pfn < zone_end_pfn; pfn += PAGES_PER_SECTION) {
> +		ms = __pfn_to_section(pfn);
> +
> +		if (unlikely(!valid_section(ms)))
> +			continue;
> +
> +		if (page_zone(pfn_to_page(pfn)) != zone)
> +			continue;
> +
> +		 /* If the section is current section, it continues the loop */
> +		if (start_pfn == pfn)
> +			continue;
> +
> +		/* If we find valid section, we have nothing to do */
> +		zone_span_writeunlock(zone);
> +		return;
> +	}
> +
> +	/* The zone has no valid section */
> +	zone->zone_start_pfn = 0;
> +	zone->spanned_pages = 0;
> +	zone_span_writeunlock(zone);
> +}
> +
> +static void shrink_pgdat_span(struct pglist_data *pgdat,
> +			      unsigned long start_pfn, unsigned long end_pfn)
> +{
> +	unsigned long pgdat_start_pfn =  pgdat->node_start_pfn;
> +	unsigned long pgdat_end_pfn =
> +		pgdat->node_start_pfn + pgdat->node_spanned_pages;
> +	unsigned long pfn;
> +	struct mem_section *ms;
> +	int nid = pgdat->node_id;
> +
> +	if (pgdat_start_pfn == start_pfn) {
> +		/*
> +		 * If the section is smallest section in the pgdat, it need
> +		 * shrink pgdat->node_start_pfn and pgdat->node_spanned_pages.
> +		 * In this case, we find second smallest valid mem_section
> +		 * for shrinking zone.
> +		 */
> +		pfn = find_smallest_section_pfn(nid, NULL, end_pfn,
> +						pgdat_end_pfn);
> +		if (pfn) {
> +			pgdat->node_start_pfn = pfn;
> +			pgdat->node_spanned_pages = pgdat_end_pfn - pfn;
> +		}
> +	} else if (pgdat_end_pfn == end_pfn) {
> +		/*
> +		 * If the section is biggest section in the pgdat, it need
> +		 * shrink pgdat->node_spanned_pages.
> +		 * In this case, we find second biggest valid mem_section for
> +		 * shrinking zone.
> +		 */
> +		pfn = find_biggest_section_pfn(nid, NULL, pgdat_start_pfn,
> +					       start_pfn);
> +		if (pfn)
> +			pgdat->node_spanned_pages = pfn - pgdat_start_pfn + 1;
> +	}
> +
> +	/*
> +	 * If the section is not biggest or smallest mem_section in the pgdat,
> +	 * it only creates a hole in the pgdat. So in this case, we need not
> +	 * change the pgdat.
> +	 * But perhaps, the pgdat has only hole data. Thus it check the pgdat
> +	 * has only hole or not.
> +	 */
> +	pfn = pgdat_start_pfn;
> +	for (; pfn < pgdat_end_pfn; pfn += PAGES_PER_SECTION) {
> +		ms = __pfn_to_section(pfn);
> +
> +		if (unlikely(!valid_section(ms)))
> +			continue;
> +
> +		if (pfn_to_nid(pfn) != nid)
> +			continue;
> +
> +		 /* If the section is current section, it continues the loop */
> +		if (start_pfn == pfn)
> +			continue;
> +
> +		/* If we find valid section, we have nothing to do */
> +		return;
> +	}
> +
> +	/* The pgdat has no valid section */
> +	pgdat->node_start_pfn = 0;
> +	pgdat->node_spanned_pages = 0;
> +}
> +
> +static void __remove_zone(struct zone *zone, unsigned long start_pfn)
> +{
> +	struct pglist_data *pgdat = zone->zone_pgdat;
> +	int nr_pages = PAGES_PER_SECTION;
> +	int zone_type;
> +	unsigned long flags;
> +
> +	zone_type = zone - pgdat->node_zones;
> +
> +	pgdat_resize_lock(zone->zone_pgdat, &flags);
> +	shrink_zone_span(zone, start_pfn, start_pfn + nr_pages);
> +	shrink_pgdat_span(pgdat, start_pfn, start_pfn + nr_pages);
> +	pgdat_resize_unlock(zone->zone_pgdat, &flags);
> +}
> +
>  static int __remove_section(struct zone *zone, struct mem_section *ms)
>  {
>  	unsigned long flags;
>  	struct pglist_data *pgdat = zone->zone_pgdat;
> +	unsigned long start_pfn;
> +	int scn_nr;
>  	int ret = -EINVAL;
>  
>  	if (!valid_section(ms))
> @@ -325,6 +528,10 @@ static int __remove_section(struct zone *zone, struct mem_section *ms)
>  	if (ret)
>  		return ret;
>  
> +	scn_nr = __section_nr(ms);
> +	start_pfn = section_nr_to_pfn(scn_nr);
> +	__remove_zone(zone, start_pfn);
> +
>  	pgdat_resize_lock(pgdat, &flags);
>  	sparse_remove_one_section(zone, ms);
>  	pgdat_resize_unlock(pgdat, &flags);
>