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mm/memory_hotplug: memory group aware "auto-movable" online policy

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Use memory groups to improve our "auto-movable" onlining policy:

1. For static memory groups (e.g., a DIMM), online a memory block MOVABLE
   only if all other memory blocks in the group are either MOVABLE or could
   be onlined MOVABLE. A DIMM will either be MOVABLE or not, not a mixture.

2. For dynamic memory groups (e.g., a virtio-mem device), online a
   memory block MOVABLE only if all other memory blocks inside the
   current unit are either MOVABLE or could be onlined MOVABLE. For a
   virtio-mem device with a device block size with 512 MiB, all 128 MiB
   memory blocks wihin a 512 MiB unit will either be MOVABLE or not, not
   a mixture.

We have to pass the memory group to zone_for_pfn_range() to take the
memory group into account.

Note: for now, there seems to be no compelling reason to make this
behavior configurable.

Link: https://lkml.kernel.org/r/20210806124715.17090-9-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Hui Zhu <teawater@gmail.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Len Brown <lenb@kernel.org>
Cc: Marek Kedzierski <mkedzier@redhat.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Wei Yang <richard.weiyang@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Hildenbrand 2021-09-07 19:55:45 -07:00 committed by Linus Torvalds
parent ffaa6ce835
commit 445fcf7c72
3 changed files with 57 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/base/memory.c
View File

@ -182,7 +182,8 @@ static int memory_block_online(struct memory_block *mem)
struct zone *zone;
int ret;
zone = zone_for_pfn_range(mem->online_type, mem->nid, start_pfn, nr_pages);
zone = zone_for_pfn_range(mem->online_type, mem->nid, mem->group,
start_pfn, nr_pages);
/*
* Although vmemmap pages have a different lifecycle than the pages
@ -379,12 +380,13 @@ static ssize_t phys_device_show(struct device *dev,
#ifdef CONFIG_MEMORY_HOTREMOVE
static int print_allowed_zone(char *buf, int len, int nid,
struct memory_group *group,
unsigned long start_pfn, unsigned long nr_pages,
int online_type, struct zone *default_zone)
{
struct zone *zone;
zone = zone_for_pfn_range(online_type, nid, start_pfn, nr_pages);
zone = zone_for_pfn_range(online_type, nid, group, start_pfn, nr_pages);
if (zone == default_zone)
return 0;
@ -397,9 +399,10 @@ static ssize_t valid_zones_show(struct device *dev,
struct memory_block *mem = to_memory_block(dev);
unsigned long start_pfn = section_nr_to_pfn(mem->start_section_nr);
unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block;
struct memory_group *group = mem->group;
struct zone *default_zone;
int nid = mem->nid;
int len = 0;
int nid;
/*
* Check the existing zone. Make sure that we do that only on the
@ -418,14 +421,13 @@ static ssize_t valid_zones_show(struct device *dev,
goto out;
}
nid = mem->nid;
default_zone = zone_for_pfn_range(MMOP_ONLINE, nid, start_pfn,
nr_pages);
default_zone = zone_for_pfn_range(MMOP_ONLINE, nid, group,
start_pfn, nr_pages);
len += sysfs_emit_at(buf, len, "%s", default_zone->name);
len += print_allowed_zone(buf, len, nid, start_pfn, nr_pages,
len += print_allowed_zone(buf, len, nid, group, start_pfn, nr_pages,
MMOP_ONLINE_KERNEL, default_zone);
len += print_allowed_zone(buf, len, nid, start_pfn, nr_pages,
len += print_allowed_zone(buf, len, nid, group, start_pfn, nr_pages,
MMOP_ONLINE_MOVABLE, default_zone);
out:
len += sysfs_emit_at(buf, len, "\n");

3
include/linux/memory_hotplug.h
View File

@ -349,7 +349,8 @@ extern void sparse_remove_section(struct mem_section *ms,
extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
unsigned long pnum);
extern struct zone *zone_for_pfn_range(int online_type, int nid,
unsigned long start_pfn, unsigned long nr_pages);
struct memory_group *group, unsigned long start_pfn,
unsigned long nr_pages);
extern int arch_create_linear_mapping(int nid, u64 start, u64 size,
struct mhp_params *params);
void arch_remove_linear_mapping(u64 start, u64 size);

48
mm/memory_hotplug.c
View File

@ -852,12 +852,53 @@ static struct zone *default_kernel_zone_for_pfn(int nid, unsigned long start_pfn
* "present pages" is an upper limit that can get reached at runtime. As
* we base our calculations on KERNEL_EARLY, this is not an issue.
*/
static struct zone *auto_movable_zone_for_pfn(int nid, unsigned long pfn,
static struct zone *auto_movable_zone_for_pfn(int nid,
struct memory_group *group,
unsigned long pfn,
unsigned long nr_pages)
{
unsigned long online_pages = 0, max_pages, end_pfn;
struct page *page;
if (!auto_movable_ratio)
goto kernel_zone;
if (group && !group->is_dynamic) {
max_pages = group->s.max_pages;
online_pages = group->present_movable_pages;
/* If anything is !MOVABLE online the rest !MOVABLE. */
if (group->present_kernel_pages)
goto kernel_zone;
} else if (!group || group->d.unit_pages == nr_pages) {
max_pages = nr_pages;
} else {
max_pages = group->d.unit_pages;
/*
* Take a look at all online sections in the current unit.
* We can safely assume that all pages within a section belong
* to the same zone, because dynamic memory groups only deal
* with hotplugged memory.
*/
pfn = ALIGN_DOWN(pfn, group->d.unit_pages);
end_pfn = pfn + group->d.unit_pages;
for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
page = pfn_to_online_page(pfn);
if (!page)
continue;
/* If anything is !MOVABLE online the rest !MOVABLE. */
if (page_zonenum(page) != ZONE_MOVABLE)
goto kernel_zone;
online_pages += PAGES_PER_SECTION;
}
}
/*
* Online MOVABLE if we could *currently* online all remaining parts
* MOVABLE. We expect to (add+) online them immediately next, so if
* nobody interferes, all will be MOVABLE if possible.
*/
nr_pages = max_pages - online_pages;
if (!auto_movable_can_online_movable(NUMA_NO_NODE, nr_pages))
goto kernel_zone;
@ -897,7 +938,8 @@ static inline struct zone *default_zone_for_pfn(int nid, unsigned long start_pfn
}
struct zone *zone_for_pfn_range(int online_type, int nid,
unsigned long start_pfn, unsigned long nr_pages)
struct memory_group *group, unsigned long start_pfn,
unsigned long nr_pages)
{
if (online_type == MMOP_ONLINE_KERNEL)
return default_kernel_zone_for_pfn(nid, start_pfn, nr_pages);
@ -906,7 +948,7 @@ struct zone *zone_for_pfn_range(int online_type, int nid,
return &NODE_DATA(nid)->node_zones[ZONE_MOVABLE];
if (online_policy == ONLINE_POLICY_AUTO_MOVABLE)
return auto_movable_zone_for_pfn(nid, start_pfn, nr_pages);
return auto_movable_zone_for_pfn(nid, group, start_pfn, nr_pages);
return default_zone_for_pfn(nid, start_pfn, nr_pages);
}