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Subject[PATCH] x86: replace shrink pages with remove_active_ranges v2
Date

in case we have kva before ramdisk on node, we still need to use
those ranges.

v2: reserve_early kva ram area, in case there are holes in highmem, to avoid
those area could be treat as free high pages.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>

Index: linux-2.6/arch/x86/mm/discontig_32.c
===================================================================
--- linux-2.6.orig/arch/x86/mm/discontig_32.c
+++ linux-2.6/arch/x86/mm/discontig_32.c
@@ -227,8 +227,8 @@ static unsigned long calculate_numa_rema
unsigned long size, reserve_pages = 0;

for_each_online_node(nid) {
- u64 node_end_target;
- u64 node_end_final;
+ u64 node_kva_target;
+ u64 node_kva_final;

/*
* The acpi/srat node info can show hot-add memroy zones
@@ -251,42 +251,45 @@ static unsigned long calculate_numa_rema
/* now the roundup is correct, convert to PAGE_SIZE pages */
size = size * PTRS_PER_PTE;

- node_end_target = round_down(node_end_pfn[nid] - size,
+ node_kva_target = round_down(node_end_pfn[nid] - size,
PTRS_PER_PTE);
- node_end_target <<= PAGE_SHIFT;
+ node_kva_target <<= PAGE_SHIFT;
do {
- node_end_final = find_e820_area(node_end_target,
+ node_kva_final = find_e820_area(node_kva_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]));
+ node_kva_target -= LARGE_PAGE_BYTES;
+ } while (node_kva_final == -1ULL &&
+ (node_kva_target>>PAGE_SHIFT) > (node_start_pfn[nid]));

- if (node_end_final == -1ULL)
+ if (node_kva_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 %lld pages\n",
- nid, node_end_pfn[nid], node_end_final>>PAGE_SHIFT);
+ printk("Reserving %ld pages of KVA for lmem_map of node %d at %llx\n",
+ size, nid, node_kva_final>>PAGE_SHIFT);

/*
* prevent kva address below max_low_pfn want it on system
* with less memory later.
* layout will be: KVA address , KVA RAM
+ *
+ * we are supposed to only record the one less then max_low_pfn
+ * but we could have some hole in high memory, and it will only
+ * check page_is_ram(pfn) && !page_is_reserved_early(pfn) to decide
+ * to use it as free.
+ * So reserve_early here, hope we don't run out of that array
*/
- 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] = node_end_final>>PAGE_SHIFT;
- node_remap_start_pfn[nid] = node_end_pfn[nid];
- shrink_active_range(nid, node_end_pfn[nid]);
+ reserve_early(node_kva_final,
+ node_kva_final+(((u64)size)<<PAGE_SHIFT),
+ "KVA RAM");
+
+ node_remap_start_pfn[nid] = node_kva_final>>PAGE_SHIFT;
+ remove_active_range(nid, node_remap_start_pfn[nid],
+ node_remap_start_pfn[nid] + size);
}
printk("Reserving total of %ld pages for numa KVA remap\n",
reserve_pages);
Index: linux-2.6/include/linux/mm.h
===================================================================
--- linux-2.6.orig/include/linux/mm.h
+++ linux-2.6/include/linux/mm.h
@@ -998,7 +998,8 @@ extern void free_area_init_node(int nid,
extern void free_area_init_nodes(unsigned long *max_zone_pfn);
extern void add_active_range(unsigned int nid, unsigned long start_pfn,
unsigned long end_pfn);
-extern void shrink_active_range(unsigned int nid, unsigned long new_end_pfn);
+extern void remove_active_range(unsigned int nid, unsigned long start_pfn,
+ unsigned long end_pfn);
extern void push_node_boundaries(unsigned int nid, unsigned long start_pfn,
unsigned long end_pfn);
extern void remove_all_active_ranges(void);
Index: linux-2.6/mm/page_alloc.c
===================================================================
--- linux-2.6.orig/mm/page_alloc.c
+++ linux-2.6/mm/page_alloc.c
@@ -3562,30 +3562,47 @@ void __init add_active_range(unsigned in
}

/**
- * shrink_active_range - Shrink an existing registered range of PFNs
+ * remove_active_range - Shrink an existing registered range of PFNs
* @nid: The node id the range is on that should be shrunk
- * @new_end_pfn: The new PFN of the range
+ * @start_pfn: The new PFN of the range
+ * @end_pfn: The new PFN of the range
*
* i386 with NUMA use alloc_remap() to store a node_mem_map on a local node.
* The map is kept near the end physical page range that has already been
* registered. This function allows an arch to shrink an existing registered
* range.
*/
-void __init shrink_active_range(unsigned int nid, unsigned long new_end_pfn)
+void __init remove_active_range(unsigned int nid, unsigned long start_pfn,
+ unsigned long end_pfn)
{
int i, j;
int removed = 0;

+ printk(KERN_DEBUG "remove_active_range (%d, %lu, %lu)\n",
+ nid, start_pfn, end_pfn);
+
/* Find the old active region end and shrink */
for_each_active_range_index_in_nid(i, nid) {
- if (early_node_map[i].start_pfn >= new_end_pfn) {
+ if (early_node_map[i].start_pfn >= start_pfn &&
+ early_node_map[i].end_pfn <= end_pfn) {
/* clear it */
+ early_node_map[i].start_pfn = 0;
early_node_map[i].end_pfn = 0;
removed = 1;
continue;
}
- if (early_node_map[i].end_pfn > new_end_pfn) {
- early_node_map[i].end_pfn = new_end_pfn;
+ if (early_node_map[i].start_pfn < start_pfn &&
+ early_node_map[i].end_pfn > start_pfn) {
+ unsigned long temp_end_pfn = early_node_map[i].end_pfn;
+ early_node_map[i].end_pfn = start_pfn;
+ if (temp_end_pfn > end_pfn)
+ add_active_range(nid, end_pfn, temp_end_pfn);
+ continue;
+ }
+ if (early_node_map[i].start_pfn >= start_pfn &&
+ early_node_map[i].end_pfn > end_pfn &&
+ early_node_map[i].start_pfn < end_pfn) {
+ early_node_map[i].start_pfn = end_pfn;
continue;
}
}

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