Account for holes that are outside the range of physical memory
From: Mel Gorman <hidden>
Date: 2006-09-04 15:38:33
Also in:
linux-mm, lkml
absent_pages_in_range() made the assumption that users of the API would not care about holes beyound the end of physical memory. This was not the case. This patch will account for ranges outside of physical memory as holes correctly. diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.18-rc4-mm3-clean/arch/x86_64/mm/srat.c linux-2.6.18-rc4-mm3-001_account_holes_range/arch/x86_64/mm/srat.c
--- linux-2.6.18-rc4-mm3-clean/arch/x86_64/mm/srat.c 2006-08-28 15:05:28.000000000 +0100
+++ linux-2.6.18-rc4-mm3-001_account_holes_range/arch/x86_64/mm/srat.c 2006-09-01 13:29:25.000000000 +0100@@ -240,7 +240,9 @@ static int reserve_hotadd(int node, unsi /* This check might be a bit too strict, but I'm keeping it for now. */ if (absent_pages_in_range(s_pfn, e_pfn) != e_pfn - s_pfn) { - printk(KERN_ERR "SRAT: Hotplug area has existing memory\n"); + printk(KERN_ERR + "SRAT: Hotplug area %lu -> %lu has existing memory\n", + s_pfn, e_pfn); return -1; }
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.18-rc4-mm3-clean/mm/page_alloc.c linux-2.6.18-rc4-mm3-001_account_holes_range/mm/page_alloc.c
--- linux-2.6.18-rc4-mm3-clean/mm/page_alloc.c 2006-08-28 15:05:30.000000000 +0100
+++ linux-2.6.18-rc4-mm3-001_account_holes_range/mm/page_alloc.c 2006-09-01 13:29:25.000000000 +0100@@ -2259,6 +2259,10 @@ unsigned long __init __absent_pages_in_r if (i == -1) return 0; + /* Account for ranges before physical memory on this node */ + if (early_node_map[i].start_pfn > range_start_pfn) + hole_pages = early_node_map[i].start_pfn - range_start_pfn; + prev_end_pfn = early_node_map[i].start_pfn; /* Find all holes for the zone within the node */
@@ -2280,6 +2284,11 @@ unsigned long __init __absent_pages_in_r prev_end_pfn = early_node_map[i].end_pfn; } + /* Account for ranges past physical memory on this node */ + if (range_end_pfn > prev_end_pfn) + hole_pages = range_end_pfn - + max(range_start_pfn, prev_end_pfn); + return hole_pages; }
@@ -2301,9 +2310,16 @@ unsigned long __init zone_absent_pages_i unsigned long zone_type, unsigned long *ignored) { - return __absent_pages_in_range(nid, - arch_zone_lowest_possible_pfn[zone_type], - arch_zone_highest_possible_pfn[zone_type]); + unsigned long node_start_pfn, node_end_pfn; + unsigned long zone_start_pfn, zone_end_pfn; + + get_pfn_range_for_nid(nid, &node_start_pfn, &node_end_pfn); + zone_start_pfn = max(arch_zone_lowest_possible_pfn[zone_type], + node_start_pfn); + zone_end_pfn = min(arch_zone_highest_possible_pfn[zone_type], + node_end_pfn); + + return __absent_pages_in_range(nid, zone_start_pfn, zone_end_pfn); } /* Return the zone index a PFN is in */