Commit 2e1c49db authored by Zou Nan hai's avatar Zou Nan hai Committed by Linus Torvalds
Browse files

x86_64: allocate sparsemem memmap above 4G 



On systems with huge amount of physical memory, VFS cache and memory memmap
may eat all available system memory under 4G, then the system may fail to
allocate swiotlb bounce buffer.

There was a fix for this issue in arch/x86_64/mm/numa.c, but that fix dose
not cover sparsemem model.

This patch add fix to sparsemem model by first try to allocate memmap above
4G.

Signed-off-by: default avatarZou Nan hai <nanhai.zou@intel.com>
Acked-by: default avatarSuresh Siddha <suresh.b.siddha@intel.com>
Cc: Andi Kleen <ak@suse.de>
Cc: <stable@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent fa0aa866

arch/x86_64/mm/init.c

+6 −0
Original line number Diff line number Diff line
@@ -761,3 +761,9 @@ int in_gate_area_no_task(unsigned long addr) 
{

	return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END);

}



void *alloc_bootmem_high_node(pg_data_t *pgdat, unsigned long size)

{

	return __alloc_bootmem_core(pgdat->bdata, size,

			SMP_CACHE_BYTES, (4UL*1024*1024*1024), 0);

}

include/linux/bootmem.h

+1 −0
Original line number Diff line number Diff line
@@ -59,6 +59,7 @@ extern void *__alloc_bootmem_core(struct bootmem_data *bdata, 
				  unsigned long align,

				  unsigned long goal,

				  unsigned long limit);

extern void *alloc_bootmem_high_node(pg_data_t *pgdat, unsigned long size);



#ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE

extern void reserve_bootmem(unsigned long addr, unsigned long size);

mm/sparse.c

+11 −0
Original line number Diff line number Diff line
@@ -209,6 +209,12 @@ static int __meminit sparse_init_one_section(struct mem_section *ms, 
	return 1;

}



__attribute__((weak))

void *alloc_bootmem_high_node(pg_data_t *pgdat, unsigned long size)

{

	return NULL;

}



static struct page __init *sparse_early_mem_map_alloc(unsigned long pnum)

{

	struct page *map;
@@ -219,6 +225,11 @@ static struct page __init *sparse_early_mem_map_alloc(unsigned long pnum) 
	if (map)

		return map;



  	map = alloc_bootmem_high_node(NODE_DATA(nid),

                       sizeof(struct page) * PAGES_PER_SECTION);

	if (map)

		return map;



	map = alloc_bootmem_node(NODE_DATA(nid),

			sizeof(struct page) * PAGES_PER_SECTION);

	if (map)

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