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Message-ID: <508EA207.2060205@gmail.com>
Date: Mon, 29 Oct 2012 23:34:31 +0800
From: Jianguo Wu <wujianguo106@...il.com>
To: wency@...fujitsu.com
CC: x86@...nel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
linuxppc-dev@...ts.ozlabs.org, linux-acpi@...r.kernel.org,
linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
linux-ia64@...r.kernel.org, cmetcalf@...era.com,
sparclinux@...r.kernel.org, rientjes@...gle.com, liuj97@...il.com,
len.brown@...el.com, benh@...nel.crashing.org, paulus@...ba.org,
cl@...ux.com, minchan.kim@...il.com, akpm@...ux-foundation.org,
kosaki.motohiro@...fujitsu.com, isimatu.yasuaki@...fujitsu.com
Subject: Re: [PATCH v2 10/12] memory-hotplug: memory_hotplug: clear zone when
removing the memory
On 2012/10/23 18:30, wency@...fujitsu.com wrote:
> From: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
>
> 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 <rientjes@...gle.com>
> CC: Jiang Liu <liuj97@...il.com>
> CC: Len Brown <len.brown@...el.com>
> CC: Christoph Lameter <cl@...ux.com>
> Cc: Minchan Kim <minchan.kim@...il.com>
> CC: Andrew Morton <akpm@...ux-foundation.org>
> CC: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
> Signed-off-by: Wen Congyang <wency@...fujitsu.com>
> ---
> 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);
>
--
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