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authorDavid Hildenbrand <david@redhat.com>2021-09-07 19:55:45 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-09-08 11:50:23 -0700
commit445fcf7c721450dd1d4ec6c217b3c6a932602a44 (patch)
treeab1a3b85c247af26ad0f524ff314739bfcbbbb1d /mm
parentffaa6ce835eaf0fe3eb05ff931de3c1134b07f35 (diff)
downloadlinux-445fcf7c721450dd1d4ec6c217b3c6a932602a44.tar.bz2
mm/memory_hotplug: memory group aware "auto-movable" online policy
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>
Diffstat (limited to 'mm')
-rw-r--r--mm/memory_hotplug.c48
1 files changed, 45 insertions, 3 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 8199a4f98b2b..248e2ba4ac59 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -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);
}