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x86, numa, 32-bit: use find_e820_area() to find KVA RAM on node

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don't assume we can use RAM near the end of every node.
Esp systems that have few memory and they could have
kva address and kva RAM all below max_low_pfn.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu 2008-06-06 18:53:33 -07:00 committed by Ingo Molnar
parent cc1a9d86ce
commit 9043f00796
1 changed files with 31 additions and 24 deletions
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55
arch/x86/mm/discontig_32.c
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@ -228,17 +228,21 @@ static unsigned long calculate_numa_remap_pages(void)
{
int nid;
unsigned long size, reserve_pages = 0;
unsigned long pfn;
for_each_online_node(nid) {
unsigned old_end_pfn = node_end_pfn[nid];
u64 node_end_target;
u64 node_end_final;
/*
* The acpi/srat node info can show hot-add memroy zones
* where memory could be added but not currently present.
*/
printk("node %d pfn: [%lx - %lx]\n",
nid, node_start_pfn[nid], node_end_pfn[nid]);
if (node_start_pfn[nid] > max_pfn)
continue;
if (!node_end_pfn[nid])
continue;
if (node_end_pfn[nid] > max_pfn)
node_end_pfn[nid] = max_pfn;
@ -250,37 +254,40 @@ static unsigned long calculate_numa_remap_pages(void)
/* now the roundup is correct, convert to PAGE_SIZE pages */
size = size * PTRS_PER_PTE;
/*
* Validate the region we are allocating only contains valid
* pages.
*/
for (pfn = node_end_pfn[nid] - size;
pfn < node_end_pfn[nid]; pfn++)
if (!page_is_ram(pfn))
break;
node_end_target = round_down(node_end_pfn[nid] - size,
PTRS_PER_PTE);
node_end_target <<= PAGE_SHIFT;
do {
node_end_final = find_e820_area(node_end_target,
((u64)node_end_pfn[nid])<<PAGE_SHIFT,
((u64)size)<<PAGE_SHIFT,
LARGE_PAGE_BYTES);
node_end_target -= LARGE_PAGE_BYTES;
} while (node_end_final == -1ULL &&
(node_end_target>>PAGE_SHIFT) > (node_start_pfn[nid]));
if (pfn != node_end_pfn[nid])
size = 0;
if (node_end_final == -1ULL)
panic("Can not get kva ram\n");
printk("Reserving %ld pages of KVA for lmem_map of node %d\n",
size, nid);
node_remap_size[nid] = size;
node_remap_offset[nid] = reserve_pages;
reserve_pages += size;
printk("Shrinking node %d from %ld pages to %ld pages\n",
nid, node_end_pfn[nid], node_end_pfn[nid] - size);
printk("Shrinking node %d from %ld pages to %lld pages\n",
nid, node_end_pfn[nid], node_end_final>>PAGE_SHIFT);
if (node_end_pfn[nid] & (PTRS_PER_PTE-1)) {
/*
* Align node_end_pfn[] and node_remap_start_pfn[] to
* pmd boundary. remap_numa_kva will barf otherwise.
*/
printk("Shrinking node %d further by %ld pages for proper alignment\n",
nid, node_end_pfn[nid] & (PTRS_PER_PTE-1));
size += node_end_pfn[nid] & (PTRS_PER_PTE-1);
}
/*
* prevent kva address below max_low_pfn want it on system
* with less memory later.
* layout will be: KVA address , KVA RAM
*/
if ((node_end_final>>PAGE_SHIFT) < max_low_pfn)
reserve_early(node_end_final,
node_end_final+(((u64)size)<<PAGE_SHIFT),
"KVA RAM");
node_end_pfn[nid] -= size;
node_end_pfn[nid] = node_end_final>>PAGE_SHIFT;
node_remap_start_pfn[nid] = node_end_pfn[nid];
shrink_active_range(nid, node_end_pfn[nid]);
}