[PATCH 0/2] Optimize the code of mem_map allocation in

[Baoquan He]

In 5-level paging mode, allocating memory with the size of NR_MEM_SECTIONS
is a bad idea. So in this patchset, trying to optimize to save memory.
Othersise kdump kernel can't boot up with normal crashkernel reservation
setting. And for normal kernel, the 512M consumption is not also not
wise, though it's a temporary allocation. 

Baoquan He (2):
  mm/sparsemem: Defer the ms->section_mem_map clearing a little later
  mm/sparse.c: Add nr_present_sections to change the mem_map allocation

 mm/sparse-vmemmap.c |  9 +++++----
 mm/sparse.c         | 54 ++++++++++++++++++++++++++++++++++++-----------------
 2 files changed, 42 insertions(+), 21 deletions(-)

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2.13.6