path: root/mm/sparse-vmemmap.c
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authorCannon Matthews <>2018-08-17 15:49:17 -0700
committerLinus Torvalds <>2018-08-17 16:20:32 -0700
commit330d6e489a0ab49136561d7f792b1d81bcdbb83c (patch)
tree3e051312557b545b5b4483ae2f35589bc0271c27 /mm/sparse-vmemmap.c
parentd8a759b5703519d37fa5b752f825cbfc06b57906 (diff)
mm/hugetlb.c: don't zero 1GiB bootmem pages
When using 1GiB pages during early boot, use the new memblock_virt_alloc_try_nid_raw() to allocate memory without zeroing it. Zeroing out hundreds or thousands of GiB in a single core memset() call is very slow, and can make early boot last upwards of 20-30 minutes on multi TiB machines. The memory does not need to be zero'd as the hugetlb pages are always zero'd on page fault. Tested: Booted with ~3800 1G pages, and it booted successfully in roughly the same amount of time as with 0, as opposed to the 25+ minutes it would take before. Link: Signed-off-by: Cannon Matthews <> Acked-by: Mike Kravetz <> Acked-by: Michal Hocko <> Cc: Andres Lagar-Cavilla <> Cc: Peter Feiner <> Cc: David Matlack <> Cc: Greg Thelen <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'mm/sparse-vmemmap.c')
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