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memory hotplug: Hot-add with sparsemem-vmemmap

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This patch is to avoid panic when memory hot-add is executed with
sparsemem-vmemmap.  Current vmemmap-sparsemem code doesn't support memory
hot-add.  Vmemmap must be populated when hot-add.  This is for
2.6.23-rc2-mm2.

Todo: # Even if this patch is applied, the message "[xxxx-xxxx] potential
        offnode page_structs" is displayed. To allocate memmap on its node,
        memmap (and pgdat) must be initialized itself like chicken and
        egg relationship.

      # vmemmap_unpopulate will be necessary for followings.
         - For cancel hot-add due to error.
         - For unplug.

Signed-off-by: Yasunori Goto <[email protected]>
Cc: Andy Whitcroft <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Mel Gorman <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Yasunori Goto 2007-10-16 01:26:14 -07:00 • committed by Linus Torvalds
commit 98f3cfc1dc
3 changed files with 24 additions and 5 deletions
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25
mm/sparse.c
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@ -259,7 +259,7 @@ static unsigned long *sparse_early_usemap_alloc(unsigned long pnum)
}
#ifndef CONFIG_SPARSEMEM_VMEMMAP
struct page __init *sparse_early_mem_map_populate(unsigned long pnum, int nid)
struct page __init *sparse_mem_map_populate(unsigned long pnum, int nid)
{
struct page *map;
@ -284,7 +284,7 @@ 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_early_mem_map_populate(pnum, nid);
map = sparse_mem_map_populate(pnum, nid);
if (map)
return map;
@ -322,6 +322,18 @@ 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,
unsigned long nr_pages)
{
/* This will make the necessary allocations eventually. */
return sparse_mem_map_populate(pnum, nid);
}
static void __kfree_section_memmap(struct page *memmap, unsigned long nr_pages)
{
return; /* XXX: Not implemented yet */
}
#else
static struct page *__kmalloc_section_memmap(unsigned long nr_pages)
{
struct page *page, *ret;
@ -344,6 +356,12 @@ got_map_ptr:
return ret;
}
static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid,
unsigned long nr_pages)
{
return __kmalloc_section_memmap(nr_pages);
}
static int vaddr_in_vmalloc_area(void *addr)
{
if (addr >= (void *)VMALLOC_START &&
@ -360,6 +378,7 @@ static void __kfree_section_memmap(struct page *memmap, unsigned long nr_pages)
free_pages((unsigned long)memmap,
get_order(sizeof(struct page) * nr_pages));
}
#endif /* CONFIG_SPARSEMEM_VMEMMAP */
/*
* returns the number of sections whose mem_maps were properly
@ -382,7 +401,7 @@ int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
* plus, it does a kmalloc
*/
sparse_index_init(section_nr, pgdat->node_id);
memmap = __kmalloc_section_memmap(nr_pages);
memmap = kmalloc_section_memmap(section_nr, pgdat->node_id, nr_pages);
usemap = __kmalloc_section_usemap();
pgdat_resize_lock(pgdat, &flags);