The patch titled
Subject: mm/memblock: reduce overhead in binary search
has been added to the -mm tree. Its filename is
mm-memblock-reduce-overhead-in-binary-search.patch
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------------------------------------------------------
From: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx>
Subject: mm/memblock: reduce overhead in binary search
When checking that the indicated address belongs to the memory region, the
memory regions are checked one by one through a binary search, which will
be time consuming.
If the indicated address isn't in the memory region, then we needn't do
the time-consuming search. Add a check on the indicated address for that
purpose.
Signed-off-by: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Gavin Shan <shangw@xxxxxxxxxxxxxxxxxx>
Cc: Yinghai Lu <yinghai@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memblock.c | 5 +++++
1 file changed, 5 insertions(+)
diff -puN mm/memblock.c~mm-memblock-reduce-overhead-in-binary-search mm/memblock.c
--- a/mm/memblock.c~mm-memblock-reduce-overhead-in-binary-search
+++ a/mm/memblock.c
@@ -888,6 +888,11 @@ int __init memblock_is_reserved(phys_add
int __init_memblock memblock_is_memory(phys_addr_t addr)
{
+
+ if (unlikely(addr < memblock_start_of_DRAM() ||
+ addr >= memblock_end_of_DRAM()))
+ return 0;
+
return memblock_search(&memblock.memory, addr) != -1;
}
_
Patches currently in -mm which might be from liwanp@xxxxxxxxxxxxxxxxxx are
mm-mmu_notifier-init-notifier-if-necessary.patch
mm-vmscan-fix-error-number-for-failed-kthread.patch
mm-memblock-reduce-overhead-in-binary-search.patch
mm-memblock-rename-get_allocated_memblock_reserved_regions_info.patch
mm-memblock-use-existing-interface-to-set-nid.patch
mm-memblock-cleanup-early_node_map-related-comments.patch
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