patch-2.4.20 linux-2.4.20/arch/x86_64/mm/numa.c

• Lines: 195
• Date: Thu Nov 28 15:53:12 2002
• Orig file: linux-2.4.19/arch/x86_64/mm/numa.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.19/arch/x86_64/mm/numa.c linux-2.4.20/arch/x86_64/mm/numa.c
@@ -0,0 +1,194 @@
+/* 
+ * Generic VM initialization for x86-64 NUMA setups.
+ * Copyright 2002 Andi Kleen, SuSE Labs.
+ * $Id: numa.c,v 1.4 2002/09/05 15:28:12 ak Exp $
+ */ 
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/bootmem.h>
+#include <linux/mmzone.h>
+#include <linux/blk.h>
+#include <asm/e820.h>
+#include <asm/proto.h>
+#include <asm/dma.h>
+
+#undef Dprintk
+#define Dprintk(...) 
+
+plat_pg_data_t *plat_node_data[MAXNODE];
+bootmem_data_t plat_node_bdata[MAX_NUMNODES];
+
+#define ZONE_ALIGN (1UL << (MAX_ORDER+PAGE_SHIFT))
+
+static int numa_off __initdata; 
+
+unsigned long nodes_present; 
+int maxnode;
+
+/* Initialize bootmem allocator for a node */
+void __init setup_node_bootmem(int nodeid, unsigned long start, unsigned long end)
+{ 
+	unsigned long start_pfn, end_pfn, bootmap_pages, bootmap_size, bootmap_start; 
+	unsigned long nodedata_phys;
+	const int pgdat_size = round_up(sizeof(plat_pg_data_t), PAGE_SIZE);
+
+	start = round_up(start, ZONE_ALIGN); 
+
+	printk("Bootmem setup node %d %016lx-%016lx\n", nodeid, start, end);
+
+	start_pfn = start >> PAGE_SHIFT;
+	end_pfn = end >> PAGE_SHIFT;
+
+	nodedata_phys = find_e820_area(start, end, pgdat_size); 
+	if (nodedata_phys == -1L) 
+		panic("Cannot find memory pgdat in node %d\n", nodeid);
+
+	Dprintk("nodedata_phys %lx\n", nodedata_phys); 
+
+	PLAT_NODE_DATA(nodeid) = phys_to_virt(nodedata_phys);
+	memset(PLAT_NODE_DATA(nodeid), 0, sizeof(plat_pg_data_t));
+	NODE_DATA(nodeid)->bdata = &plat_node_bdata[nodeid];
+
+	/* Find a place for the bootmem map */
+	bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn); 
+	bootmap_start = round_up(nodedata_phys + pgdat_size, PAGE_SIZE);
+	bootmap_start = find_e820_area(bootmap_start, end, bootmap_pages<<PAGE_SHIFT);
+	if (bootmap_start == -1L) 
+		panic("Not enough continuous space for bootmap on node %d", nodeid); 
+	Dprintk("bootmap start %lu pages %lu\n", bootmap_start, bootmap_pages); 
+	
+	bootmap_size = init_bootmem_node(NODE_DATA(nodeid),
+					 bootmap_start >> PAGE_SHIFT, 
+					 start_pfn, end_pfn); 
+
+	e820_bootmem_free(NODE_DATA(nodeid), start, end);
+
+	reserve_bootmem_node(NODE_DATA(nodeid), nodedata_phys, pgdat_size); 
+	reserve_bootmem_node(NODE_DATA(nodeid), bootmap_start, bootmap_pages<<PAGE_SHIFT);
+
+	PLAT_NODE_DATA(nodeid)->start_pfn = start_pfn;
+	PLAT_NODE_DATA(nodeid)->end_pfn = end_pfn;
+
+	if (nodeid > maxnode) 
+		maxnode = nodeid;
+	nodes_present |= (1UL << nodeid); 
+} 
+
+/* Initialize final allocator for a zone */
+void __init setup_node_zones(int nodeid)
+{ 
+	unsigned long start_pfn, end_pfn; 
+	unsigned long zones[MAX_NR_ZONES];
+	unsigned long dma_end_pfn;
+	unsigned long lmax_mapnr;
+
+	memset(zones, 0, sizeof(unsigned long) * MAX_NR_ZONES); 
+
+	start_pfn = PLAT_NODE_DATA(nodeid)->start_pfn; 
+	end_pfn = PLAT_NODE_DATA(nodeid)->end_pfn; 
+
+	printk("setting up node %d %lx-%lx\n", nodeid, start_pfn, end_pfn); 
+	
+	/* All nodes > 0 have a zero length zone DMA */ 
+	dma_end_pfn = __pa(MAX_DMA_ADDRESS) >> PAGE_SHIFT; 
+	if (start_pfn < dma_end_pfn) { 
+		zones[ZONE_DMA] = dma_end_pfn - start_pfn;
+		zones[ZONE_NORMAL] = end_pfn - dma_end_pfn; 
+	} else { 
+		zones[ZONE_NORMAL] = end_pfn - start_pfn; 
+	} 
+    
+	free_area_init_node(nodeid, NODE_DATA(nodeid), NULL, zones, 
+			    start_pfn<<PAGE_SHIFT, NULL); 
+	lmax_mapnr = PLAT_NODE_DATA_STARTNR(nodeid) + PLAT_NODE_DATA_SIZE(nodeid);
+	if (lmax_mapnr > max_mapnr)
+		max_mapnr = lmax_mapnr;
+} 
+
+int fake_node;
+
+int __init numa_initmem_init(unsigned long start_pfn, unsigned long end_pfn)
+{ 
+#ifdef CONFIG_K8_NUMA
+	if (!numa_off && !k8_scan_nodes(start_pfn<<PAGE_SHIFT, end_pfn<<PAGE_SHIFT))
+		return 0; 
+#endif
+	printk(KERN_INFO "%s\n",
+	       numa_off ? "NUMA turned off" : "No NUMA configuration found");
+		   
+	printk(KERN_INFO "Faking a node at %016lx-%016lx\n", 
+	       start_pfn << PAGE_SHIFT,
+	       end_pfn << PAGE_SHIFT); 
+	/* setup dummy node covering all memory */ 
+	fake_node = 1; 	
+	memnode_shift = 63; 
+	memnodemap[0] = 0;
+	setup_node_bootmem(0, start_pfn<<PAGE_SHIFT, end_pfn<<PAGE_SHIFT);
+	return -1; 
+} 
+
+#define for_all_nodes(x) for ((x) = 0; (x) <= maxnode; (x)++) \
+				if ((1UL << (x)) & nodes_present)
+
+unsigned long __init numa_free_all_bootmem(void) 
+{ 
+	int i;
+	unsigned long pages = 0;
+	for_all_nodes(i) {
+		pages += free_all_bootmem_node(NODE_DATA(i));
+	}
+	return pages;
+} 
+
+void __init paging_init(void)
+{ 
+	int i;
+	for_all_nodes(i) { 
+		setup_node_zones(i); 
+	}
+} 
+
+void show_mem(void)
+{
+	long i,free = 0,total = 0,reserved = 0;
+	long shared = 0, cached = 0;
+	int nid;
+
+	printk("\nMem-info:\n");
+	show_free_areas();
+	printk("Free swap:       %6dkB\n",nr_swap_pages<<(PAGE_SHIFT-10));
+	for_all_nodes (nid) { 
+		mem_map_t * lmem_map = NODE_MEM_MAP(nid);
+		i = PLAT_NODE_DATA_SIZE(nid);
+		while (i-- > 0) {
+			total++;
+			if (PageReserved(lmem_map+i))
+				reserved++;
+			else if (PageSwapCache(lmem_map+i))
+				cached++;
+			else if (!page_count(lmem_map+i))
+				free++;
+			else
+				shared += atomic_read(&lmem_map[i].count) - 1;
+		}
+	}
+	printk("%ld pages of RAM\n",total);
+	printk("%ld free pages\n",free);
+	printk("%ld reserved pages\n",reserved);
+	printk("%ld pages shared\n",shared);
+	printk("%ld pages swap cached\n",cached);
+	show_buffers();
+}
+
+/* [numa=off] */
+static __init int numa_setup(char *opt) 
+{ 
+	if (!strcmp(opt,"off"))
+		numa_off = 1;
+	return 1;
+} 
+
+__setup("numa=", numa_setup); 
+