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Commit 5d3d0f77 authored by Andi Kleen's avatar Andi Kleen Committed by Linus Torvalds
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[PATCH] x86-64: Reverse order of bootmem lists 



This leads to bootmem allocating first from node 0 instead
of from the last node.  This avoids swiotlb allocating on the last node, which
doesn't really work on a machine with >4GB.

Note: there is a better patch around from someone else that gets
rid of the pgdat list completely.

Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 6142891a

mm/bootmem.c

+11 −3
Original line number Diff line number Diff line
@@ -61,9 +61,17 @@ static unsigned long __init init_bootmem_core (pg_data_t *pgdat, 
{

	bootmem_data_t *bdata = pgdat->bdata;

	unsigned long mapsize = ((end - start)+7)/8;



	pgdat->pgdat_next = pgdat_list;

	static struct pglist_data *pgdat_last;



	pgdat->pgdat_next = NULL;

	/* Add new nodes last so that bootmem always starts

	   searching in the first nodes, not the last ones */

	if (pgdat_last)

		pgdat_last->pgdat_next = pgdat;

	else {

		pgdat_list = pgdat; 	

		pgdat_last = pgdat;

	}



	mapsize = ALIGN(mapsize, sizeof(long));

	bdata->node_bootmem_map = phys_to_virt(mapstart << PAGE_SHIFT);