Allow sub-section sized ranges to be added to the memmap.
populate_section_memmap() takes an explict pfn range rather than
assuming a full section, and those parameters are plumbed all the way
through to vmmemap_populate(). There should be no sub-section in
current code. New warnings are added to clarify which memmap allocation
paths are sub-section capable.
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Stephen Bates <stephen.bates@xxxxxxxxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
arch/x86/mm/init_64.c | 4 ++-
include/linux/mm.h | 3 ++
mm/sparse-vmemmap.c | 24 ++++++++++++++------
mm/sparse.c | 60 ++++++++++++++++++++++++++++++++-----------------
4 files changed, 61 insertions(+), 30 deletions(-)
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index af85b686a7b0..3d719d48f11d 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -1220,7 +1220,9 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
struct vmem_altmap *altmap = to_vmem_altmap(start);
int err;
- if (boot_cpu_has(X86_FEATURE_PSE))
+ if (end - start < PAGES_PER_SECTION * sizeof(struct page))
+ err = vmemmap_populate_basepages(start, end, node);
+ else if (boot_cpu_has(X86_FEATURE_PSE))
err = vmemmap_populate_hugepages(start, end, node, altmap);
else if (altmap) {
pr_err_once("%s: no cpu support for altmap allocations\n",
diff --git a/include/linux/mm.h b/include/linux/mm.h
index b84615b0f64c..3a555c420f66 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2313,7 +2313,8 @@ void sparse_mem_maps_populate_node(struct page **map_map,
unsigned long map_count,
int nodeid);
-struct page *sparse_mem_map_populate(unsigned long pnum, int nid);
+struct page *__populate_section_memmap(unsigned long pfn,
+ unsigned long nr_pages, int nid);
pgd_t *vmemmap_pgd_populate(unsigned long addr, int node);
pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node);
pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node);
diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c
index 574c67b663fe..8679d4a81b98 100644
--- a/mm/sparse-vmemmap.c
+++ b/mm/sparse-vmemmap.c
@@ -248,20 +248,28 @@ int __meminit vmemmap_populate_basepages(unsigned long start,
return 0;
}
-struct page * __meminit sparse_mem_map_populate(unsigned long pnum, int nid)
+struct page * __meminit __populate_section_memmap(unsigned long pfn,
+ unsigned long nr_pages, int nid)
{
unsigned long start;
unsigned long end;
- struct page *map;
- map = pfn_to_page(pnum * PAGES_PER_SECTION);
- start = (unsigned long)map;
- end = (unsigned long)(map + PAGES_PER_SECTION);
+ /*
+ * The minimum granularity of memmap extensions is
+ * SECTION_ACTIVE_SIZE as allocations are tracked in the
+ * 'map_active' bitmap of the section.
+ */
+ end = ALIGN(pfn + nr_pages, PHYS_PFN(SECTION_ACTIVE_SIZE));
+ pfn &= PHYS_PFN(SECTION_ACTIVE_MASK);
+ nr_pages = end - pfn;
+
+ start = (unsigned long) pfn_to_page(pfn);
+ end = start + nr_pages * sizeof(struct page);
if (vmemmap_populate(start, end, nid))
return NULL;
- return map;
+ return pfn_to_page(pfn);
}
void __init sparse_mem_maps_populate_node(struct page **map_map,
@@ -284,11 +292,13 @@ void __init sparse_mem_maps_populate_node(struct page **map_map,
for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
struct mem_section *ms;
+ unsigned long pfn = section_nr_to_pfn(pnum);
if (!present_section_nr(pnum))
continue;
- map_map[pnum] = sparse_mem_map_populate(pnum, nodeid);
+ map_map[pnum] = __populate_section_memmap(pfn,
+ PAGES_PER_SECTION, nodeid);
if (map_map[pnum])
continue;
ms = __nr_to_section(pnum);
diff --git a/mm/sparse.c b/mm/sparse.c
index 00fdb5d04680..97f91770e3d0 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -423,7 +423,8 @@ static void __init sparse_early_usemaps_alloc_node(void *data,
}
#ifndef CONFIG_SPARSEMEM_VMEMMAP
-struct page __init *sparse_mem_map_populate(unsigned long pnum, int nid)
+struct page __init *__populate_section_memmap(unsigned long pfn,
+ unsigned long nr_pages, int nid)
{
struct page *map;
unsigned long size;
@@ -475,10 +476,12 @@ void __init sparse_mem_maps_populate_node(struct page **map_map,
/* fallback */
for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
struct mem_section *ms;
+ unsigned long pfn = section_nr_to_pfn(pnum);
if (!present_section_nr(pnum))
continue;
- map_map[pnum] = sparse_mem_map_populate(pnum, nodeid);
+ map_map[pnum] = __populate_section_memmap(pfn,
+ PAGES_PER_SECTION, nodeid);
if (map_map[pnum])
continue;
ms = __nr_to_section(pnum);
@@ -506,7 +509,8 @@ static struct page __init *sparse_early_mem_map_alloc(unsigned long pnum)
struct mem_section *ms = __nr_to_section(pnum);
int nid = sparse_early_nid(ms);
- map = sparse_mem_map_populate(pnum, nid);
+ map = __populate_section_memmap(section_nr_to_pfn(pnum),
+ PAGES_PER_SECTION, nid);
if (map)
return map;
@@ -648,15 +652,16 @@ void __init sparse_init(void)
#ifdef CONFIG_MEMORY_HOTPLUG
#ifdef CONFIG_SPARSEMEM_VMEMMAP
-static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid)
+static struct page *populate_section_memmap(unsigned long pfn,
+ unsigned long nr_pages, int nid)
{
- /* This will make the necessary allocations eventually. */
- return sparse_mem_map_populate(pnum, nid);
+ return __populate_section_memmap(pfn, nr_pages, nid);
}
-static void __kfree_section_memmap(struct page *memmap)
+
+static void depopulate_section_memmap(unsigned long pfn, unsigned long nr_pages)
{
- unsigned long start = (unsigned long)memmap;
- unsigned long end = (unsigned long)(memmap + PAGES_PER_SECTION);
+ unsigned long start = (unsigned long) pfn_to_page(pfn);
+ unsigned long end = start + nr_pages * sizeof(struct page);
vmemmap_free(start, end);
}
@@ -670,11 +675,18 @@ static void free_map_bootmem(struct page *memmap)
}
#endif /* CONFIG_MEMORY_HOTREMOVE */
#else
-static struct page *__kmalloc_section_memmap(void)
+struct page *populate_section_memmap(unsigned long pfn,
+ unsigned long nr_pages, int nid)
{
struct page *page, *ret;
unsigned long memmap_size = sizeof(struct page) * PAGES_PER_SECTION;
+ if ((pfn & ~PAGE_SECTION_MASK) || nr_pages != PAGES_PER_SECTION) {
+ WARN(1, "%s: called with section unaligned parameters\n",
+ __func__);
+ return NULL;
+ }
+
page = alloc_pages(GFP_KERNEL|__GFP_NOWARN, get_order(memmap_size));
if (page)
goto got_map_page;
@@ -691,13 +703,16 @@ static struct page *__kmalloc_section_memmap(void)
return ret;
}
-static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid)
+static void depopulate_section_memmap(unsigned long pfn, unsigned long nr_pages)
{
- return __kmalloc_section_memmap();
-}
+ struct page *memmap = pfn_to_page(pfn);
+
+ if ((pfn & ~PAGE_SECTION_MASK) || nr_pages != PAGES_PER_SECTION) {
+ WARN(1, "%s: called with section unaligned parameters\n",
+ __func__);
+ return;
+ }
-static void __kfree_section_memmap(struct page *memmap)
-{
if (is_vmalloc_addr(memmap))
vfree(memmap);
else
@@ -755,12 +770,13 @@ int __meminit sparse_add_one_section(struct zone *zone, unsigned long start_pfn)
ret = sparse_index_init(section_nr, pgdat->node_id);
if (ret < 0 && ret != -EEXIST)
return ret;
- memmap = kmalloc_section_memmap(section_nr, pgdat->node_id);
+ memmap = populate_section_memmap(start_pfn, PAGES_PER_SECTION,
+ pgdat->node_id);
if (!memmap)
return -ENOMEM;
usage = __alloc_section_usage();
if (!usage) {
- __kfree_section_memmap(memmap);
+ depopulate_section_memmap(start_pfn, PAGES_PER_SECTION);
return -ENOMEM;
}
@@ -782,7 +798,7 @@ int __meminit sparse_add_one_section(struct zone *zone, unsigned long start_pfn)
pgdat_resize_unlock(pgdat, &flags);
if (ret < 0 && ret != -EEXIST) {
kfree(usage);
- __kfree_section_memmap(memmap);
+ depopulate_section_memmap(start_pfn, PAGES_PER_SECTION);
return ret;
}
return 0;
@@ -811,7 +827,8 @@ static inline void clear_hwpoisoned_pages(struct page *memmap, int nr_pages)
#endif
static void free_section_usage(struct page *memmap,
- struct mem_section_usage *usage)
+ struct mem_section_usage *usage, unsigned long pfn,
+ unsigned long nr_pages)
{
struct page *usemap_page;
@@ -825,7 +842,7 @@ static void free_section_usage(struct page *memmap,
if (PageSlab(usemap_page) || PageCompound(usemap_page)) {
kfree(usage);
if (memmap)
- __kfree_section_memmap(memmap);
+ depopulate_section_memmap(pfn, nr_pages);
return;
}
@@ -858,7 +875,8 @@ void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
clear_hwpoisoned_pages(memmap + map_offset,
PAGES_PER_SECTION - map_offset);
- free_section_usage(memmap, usage);
+ free_section_usage(memmap, usage, section_nr_to_pfn(__section_nr(ms)),
+ PAGES_PER_SECTION);
}
#endif /* CONFIG_MEMORY_HOTREMOVE */
#endif /* CONFIG_MEMORY_HOTPLUG */
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxx. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>