The patch titled
Subject: mm/hotplug: prepare shrink_{zone, pgdat}_span for sub-section removal
has been added to the -mm tree. Its filename is
mm-hotplug-prepare-shrink_zone-pgdat_span-for-sub-section-removal.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-hotplug-prepare-shrink_zone-pgdat_span-for-sub-section-removal.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-hotplug-prepare-shrink_zone-pgdat_span-for-sub-section-removal.patch
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------------------------------------------------------
From: Dan Williams <dan.j.williams@xxxxxxxxx>
Subject: mm/hotplug: prepare shrink_{zone, pgdat}_span for sub-section removal
Sub-section hotplug support reduces the unit of operation of hotplug from
section-sized-units (PAGES_PER_SECTION) to sub-section-sized units
(PAGES_PER_SUBSECTION). Teach shrink_{zone,pgdat}_span() to consider
PAGES_PER_SUBSECTION boundaries as the points where pfn_valid(), not
valid_section(), can toggle.
Link: http://lkml.kernel.org/r/155552635609.2015392.6246305135559796835.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Jeff Moyer <jmoyer@xxxxxxxxxx>
Cc: Jérôme Glisse <jglisse@xxxxxxxxxx>
Cc: Toshi Kani <toshi.kani@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mmzone.h | 2 ++
mm/memory_hotplug.c | 16 ++++++++--------
2 files changed, 10 insertions(+), 8 deletions(-)
--- a/include/linux/mmzone.h~mm-hotplug-prepare-shrink_zone-pgdat_span-for-sub-section-removal
+++ a/include/linux/mmzone.h
@@ -1106,6 +1106,8 @@ static inline unsigned long section_nr_t
#define SECTION_ACTIVE_SIZE ((1UL << SECTION_SIZE_BITS) / BITS_PER_LONG)
#define SECTION_ACTIVE_MASK (~(SECTION_ACTIVE_SIZE - 1))
+#define PAGES_PER_SUB_SECTION (SECTION_ACTIVE_SIZE / PAGE_SIZE)
+#define PAGE_SUB_SECTION_MASK (~(PAGES_PER_SUB_SECTION-1))
struct mem_section_usage {
/*
--- a/mm/memory_hotplug.c~mm-hotplug-prepare-shrink_zone-pgdat_span-for-sub-section-removal
+++ a/mm/memory_hotplug.c
@@ -326,10 +326,10 @@ static unsigned long find_smallest_secti
{
struct mem_section *ms;
- for (; start_pfn < end_pfn; start_pfn += PAGES_PER_SECTION) {
+ for (; start_pfn < end_pfn; start_pfn += PAGES_PER_SUB_SECTION) {
ms = __pfn_to_section(start_pfn);
- if (unlikely(!valid_section(ms)))
+ if (unlikely(!pfn_valid(start_pfn)))
continue;
if (unlikely(pfn_to_nid(start_pfn) != nid))
@@ -354,10 +354,10 @@ static unsigned long find_biggest_sectio
/* pfn is the end pfn of a memory section. */
pfn = end_pfn - 1;
- for (; pfn >= start_pfn; pfn -= PAGES_PER_SECTION) {
+ for (; pfn >= start_pfn; pfn -= PAGES_PER_SUB_SECTION) {
ms = __pfn_to_section(pfn);
- if (unlikely(!valid_section(ms)))
+ if (unlikely(!pfn_valid(pfn)))
continue;
if (unlikely(pfn_to_nid(pfn) != nid))
@@ -416,10 +416,10 @@ static void shrink_zone_span(struct zone
* it check the zone has only hole or not.
*/
pfn = zone_start_pfn;
- for (; pfn < zone_end_pfn; pfn += PAGES_PER_SECTION) {
+ for (; pfn < zone_end_pfn; pfn += PAGES_PER_SUB_SECTION) {
ms = __pfn_to_section(pfn);
- if (unlikely(!valid_section(ms)))
+ if (unlikely(!pfn_valid(pfn)))
continue;
if (page_zone(pfn_to_page(pfn)) != zone)
@@ -484,10 +484,10 @@ static void shrink_pgdat_span(struct pgl
* has only hole or not.
*/
pfn = pgdat_start_pfn;
- for (; pfn < pgdat_end_pfn; pfn += PAGES_PER_SECTION) {
+ for (; pfn < pgdat_end_pfn; pfn += PAGES_PER_SUB_SECTION) {
ms = __pfn_to_section(pfn);
- if (unlikely(!valid_section(ms)))
+ if (unlikely(!pfn_valid(pfn)))
continue;
if (pfn_to_nid(pfn) != nid)
_
Patches currently in -mm which might be from dan.j.williams@xxxxxxxxx are
init-initialize-jump-labels-before-command-line-option-parsing.patch
mm-sparsemem-introduce-struct-mem_section_usage.patch
mm-sparsemem-introduce-common-definitions-for-the-size-and-mask-of-a-section.patch
mm-sparsemem-add-helpers-track-active-portions-of-a-section-at-boot.patch
mm-hotplug-prepare-shrink_zone-pgdat_span-for-sub-section-removal.patch
mm-sparsemem-convert-kmalloc_section_memmap-to-populate_section_memmap.patch
mm-hotplug-add-mem-hotplug-restrictions-for-remove_memory.patch
mm-kill-is_dev_zone-helper.patch
mm-sparsemem-prepare-for-sub-section-ranges.patch
mm-sparsemem-support-sub-section-hotplug.patch
mm-devm_memremap_pages-enable-sub-section-remap.patch
libnvdimm-pfn-fix-fsdax-mode-namespace-info-block-zero-fields.patch
libnvdimm-pfn-stop-padding-pmem-namespaces-to-section-alignment.patch
mm-shuffle-initial-free-memory-to-improve-memory-side-cache-utilization.patch
mm-shuffle-initial-free-memory-to-improve-memory-side-cache-utilization-fix.patch
mm-move-buddy-list-manipulations-into-helpers.patch
mm-move-buddy-list-manipulations-into-helpers-fix.patch
mm-maintain-randomization-of-page-free-lists.patch
