Messages in this thread | | | Date | Mon, 16 May 2005 12:43:17 -0700 (PDT) | From | christoph <> | Subject | Re: [PATCH] Factor in buddy allocator alignment requirements in node memory alignment |
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On Mon, 16 May 2005, Dave Hansen wrote:
> On Mon, 2005-05-16 at 12:05 -0700, christoph wrote: > > Memory for nodes on i386 is currently aligned on 2 MB boundaries. > > However, the buddy allocator needs pages to be aligned on > > PAGE_SIZE << MAX_ORDER which is 8MB if MAX_ORDER = 11. > > Why do you need this? Are you planning on allowing NUMA KVA remap pages > to be handed over to the buddy allocator? That would be a major > departure from what we do now, and I'd be very interested in seeing how > that is implemented before a infrastructure for it goes in.
Because the buddy allocator is complaining about wrongly allocated zones!
in page_alloc.c:
static void __init free_area_init_core(struct pglist_data *pgdat, unsigned long *zones_size, unsigned long *zholes_size) { ...
const unsigned long zone_required_alignment = 1UL << (MAX_ORDER-1);
...
if ((zone_start_pfn) & (zone_required_alignment-1)) printk(KERN_CRIT "BUG: wrong zone alignment, it will crash\n");
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