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x86, mm: introduce vmem_altmap to augment vmemmap_populate()

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In support of providing struct page for large persistent memory
capacities, use struct vmem_altmap to change the default policy for
allocating memory for the memmap array.  The default vmemmap_populate()
allocates page table storage area from the page allocator.  Given
persistent memory capacities relative to DRAM it may not be feasible to
store the memmap in 'System Memory'.  Instead vmem_altmap represents
pre-allocated "device pages" to satisfy vmemmap_alloc_block_buf()
requests.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Reported-by: kbuild test robot <lkp@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dan Williams 2016-01-15 16:56:22 -08:00 • committed by Linus Torvalds
parent 9476df7d80
commit 4b94ffdc41
10 changed files with 282 additions and 42 deletions
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8
mm/sparse.c
View file

@ -748,7 +748,7 @@ static void clear_hwpoisoned_pages(struct page *memmap, int nr_pages)
if (!memmap)
return;
for (i = 0; i < PAGES_PER_SECTION; i++) {
for (i = 0; i < nr_pages; i++) {
if (PageHWPoison(&memmap[i])) {
atomic_long_sub(1, &num_poisoned_pages);
ClearPageHWPoison(&memmap[i]);
@ -788,7 +788,8 @@ static void free_section_usemap(struct page *memmap, unsigned long *usemap)
free_map_bootmem(memmap);
}
void sparse_remove_one_section(struct zone *zone, struct mem_section *ms)
void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
unsigned long map_offset)
{
struct page *memmap = NULL;
unsigned long *usemap = NULL, flags;
@ -804,7 +805,8 @@ void sparse_remove_one_section(struct zone *zone, struct mem_section *ms)
}
pgdat_resize_unlock(pgdat, &flags);
clear_hwpoisoned_pages(memmap, PAGES_PER_SECTION);
clear_hwpoisoned_pages(memmap + map_offset,
PAGES_PER_SECTION - map_offset);
free_section_usemap(memmap, usemap);
}
#endif /* CONFIG_MEMORY_HOTREMOVE */