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Date: Wed, 14 Aug 2013 22:46:29 -0700
From: Yinghai Lu <yinghai@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>,
Tejun Heo <tj@...nel.org>
Cc: Russ Anderson <rja@....com>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH] memblock, numa: Binary search node id
Current early_pfn_to_nid() on arch that support memblock go
over memblock.memory one by one, so will take too many try
near the end.
We can use existing memblock_search to find the node id for
given pfn, that could save some time on bigger system that
have many entries memblock.memory array.
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
include/linux/memblock.h | 2 ++
mm/memblock.c | 18 ++++++++++++++++++
mm/page_alloc.c | 19 +++++++++----------
3 files changed, 29 insertions(+), 10 deletions(-)
Index: linux-2.6/include/linux/memblock.h
===================================================================
--- linux-2.6.orig/include/linux/memblock.h
+++ linux-2.6/include/linux/memblock.h
@@ -60,6 +60,8 @@ int memblock_reserve(phys_addr_t base, p
void memblock_trim_memory(phys_addr_t align);
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
+int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn,
+ unsigned long *end_pfn);
void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
unsigned long *out_end_pfn, int *out_nid);
Index: linux-2.6/mm/memblock.c
===================================================================
--- linux-2.6.orig/mm/memblock.c
+++ linux-2.6/mm/memblock.c
@@ -914,6 +914,24 @@ int __init_memblock memblock_is_memory(p
return memblock_search(&memblock.memory, addr) != -1;
}
+#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
+int __init_memblock memblock_search_pfn_nid(unsigned long pfn,
+ unsigned long *start_pfn, unsigned long *end_pfn)
+{
+ struct memblock_type *type = &memblock.memory;
+ int mid = memblock_search(type, (phys_addr_t)pfn << PAGE_SHIFT);
+
+ if (mid == -1)
+ return -1;
+
+ *start_pfn = type->regions[mid].base >> PAGE_SHIFT;
+ *end_pfn = (type->regions[mid].base + type->regions[mid].size)
+ >> PAGE_SHIFT;
+
+ return type->regions[mid].nid;
+}
+#endif
+
/**
* memblock_is_region_memory - check if a region is a subset of memory
* @base: base of region to check
Index: linux-2.6/mm/page_alloc.c
===================================================================
--- linux-2.6.orig/mm/page_alloc.c
+++ linux-2.6/mm/page_alloc.c
@@ -4186,7 +4186,7 @@ int __meminit init_currently_empty_zone(
int __meminit __early_pfn_to_nid(unsigned long pfn)
{
unsigned long start_pfn, end_pfn;
- int i, nid;
+ int nid;
/*
* NOTE: The following SMP-unsafe globals are only used early in boot
* when the kernel is running single-threaded.
@@ -4197,15 +4197,14 @@ int __meminit __early_pfn_to_nid(unsigne
if (last_start_pfn <= pfn && pfn < last_end_pfn)
return last_nid;
- for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid)
- if (start_pfn <= pfn && pfn < end_pfn) {
- last_start_pfn = start_pfn;
- last_end_pfn = end_pfn;
- last_nid = nid;
- return nid;
- }
- /* This is a memory hole */
- return -1;
+ nid = memblock_search_pfn_nid(pfn, &start_pfn, &end_pfn);
+ if (nid != -1) {
+ last_start_pfn = start_pfn;
+ last_end_pfn = end_pfn;
+ last_nid = nid;
+ }
+
+ return nid;
}
#endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */
--
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