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.
Here are the timing differences for several machines. In each case with
the patch less time was spent in __early_pfn_to_nid().
3.11-rc5 with patch difference (%)
-------- ---------- --------------
UV1: 256 nodes 9TB: 411.66 402.47 -9.19 (2.23%)
UV2: 255 nodes 16TB: 1141.02 1138.12 -2.90 (0.25%)
UV2: 64 nodes 2TB: 128.15 126.53 -1.62 (1.26%)
UV2: 32 nodes 2TB: 121.87 121.07 -0.80 (0.66%)
Time in seconds.
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Acked-by: Russ Anderson <rja@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
void memblock_trim_memory(phys_addr_t align);
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
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);
void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
unsigned long *out_end_pfn, int *out_nid);
return memblock_search(&memblock.memory, addr) != -1;
}
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
/**
* memblock_is_region_memory - check if a region is a subset of memory
* @base: base of region to check
int __meminit __early_pfn_to_nid(unsigned long pfn)
{
unsigned long start_pfn, end_pfn;
int __meminit __early_pfn_to_nid(unsigned long pfn)
{
unsigned long start_pfn, end_pfn;
/*
* NOTE: The following SMP-unsafe globals are only used early in boot
* when the kernel is running single-threaded.
/*
* NOTE: The following SMP-unsafe globals are only used early in boot
* when the kernel is running single-threaded.
if (last_start_pfn <= pfn && pfn < last_end_pfn)
return last_nid;
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 */
}
#endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */