The patch titled
Subject: mm/hugetlb.c: don't zero 1GiB bootmem pages
has been added to the -mm tree. Its filename is
mm-hugetlb-dont-zero-1gib-bootmem-pages.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-hugetlb-dont-zero-1gib-bootmem-pages.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-hugetlb-dont-zero-1gib-bootmem-pages.patch
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------------------------------------------------------
From: Cannon Matthews <cannonmatthews@xxxxxxxxxx>
Subject: 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: http://lkml.kernel.org/r/20180711213313.92481-1-cannonmatthews@xxxxxxxxxx
Signed-off-by: Cannon Matthews <cannonmatthews@xxxxxxxxxx>
Acked-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Andres Lagar-Cavilla <andreslc@xxxxxxxxxx>
Cc: Peter Feiner <pfeiner@xxxxxxxxxx>
Cc: David Matlack <dmatlack@xxxxxxxxxx>
Cc: Greg Thelen <gthelen@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/hugetlb.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff -puN mm/hugetlb.c~mm-hugetlb-dont-zero-1gib-bootmem-pages mm/hugetlb.c
--- a/mm/hugetlb.c~mm-hugetlb-dont-zero-1gib-bootmem-pages
+++ a/mm/hugetlb.c
@@ -2101,7 +2101,7 @@ int __alloc_bootmem_huge_page(struct hst
for_each_node_mask_to_alloc(h, nr_nodes, node, &node_states[N_MEMORY]) {
void *addr;
- addr = memblock_virt_alloc_try_nid_nopanic(
+ addr = memblock_virt_alloc_try_nid_raw(
huge_page_size(h), huge_page_size(h),
0, BOOTMEM_ALLOC_ACCESSIBLE, node);
if (addr) {
@@ -2119,6 +2119,7 @@ int __alloc_bootmem_huge_page(struct hst
found:
BUG_ON(!IS_ALIGNED(virt_to_phys(m), huge_page_size(h)));
/* Put them into a private list first because mem_map is not up yet */
+ INIT_LIST_HEAD(&m->list);
list_add(&m->list, &huge_boot_pages);
m->hstate = h;
return 1;
_
Patches currently in -mm which might be from cannonmatthews@xxxxxxxxxx are
mm-hugetlb-dont-zero-1gib-bootmem-pages.patch
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