From 0ac398b171aacd0f0c132d989ec4efb5de94f34a Mon Sep 17 00:00:00 2001 From: Yunfeng Ye Date: Sat, 30 Nov 2019 17:56:27 -0800 Subject: mm: support memblock alloc on the exact node for sparse_buffer_init() sparse_buffer_init() use memblock_alloc_try_nid_raw() to allocate memory for page management structure, if memory allocation fails from specified node, it will fall back to allocate from other nodes. Normally, the page management structure will not exceed 2% of the total memory, but a large continuous block of allocation is needed. In most cases, memory allocation from the specified node will succeed, but a node memory become highly fragmented will fail. we expect to allocate memory base section rather than by allocating a large block of memory from other NUMA nodes Add memblock_alloc_exact_nid_raw() for this situation, which allocate boot memory block on the exact node. If a large contiguous block memory allocate fail in sparse_buffer_init(), it will fall back to allocate small block memory base section. Link: http://lkml.kernel.org/r/66755ea7-ab10-8882-36fd-3e02b03775d5@huawei.com Signed-off-by: Yunfeng Ye Reviewed-by: Mike Rapoport Cc: Wei Yang Cc: Oscar Salvador Cc: Dan Williams Cc: David Hildenbrand Cc: Qian Cai Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/sparse.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'mm/sparse.c') diff --git a/mm/sparse.c b/mm/sparse.c index 8526d3bf1e4e..b20ab7cdac86 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -486,7 +486,7 @@ static void __init sparse_buffer_init(unsigned long size, int nid) * and we want it to be properly aligned to the section size - this is * especially the case for VMEMMAP which maps memmap to PMDs */ - sparsemap_buf = memblock_alloc_try_nid_raw(size, section_map_size(), + sparsemap_buf = memblock_alloc_exact_nid_raw(size, section_map_size(), addr, MEMBLOCK_ALLOC_ACCESSIBLE, nid); sparsemap_buf_end = sparsemap_buf + size; } -- cgit