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authorMuchun Song <songmuchun@bytedance.com>2021-07-01 04:48:25 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-07-01 06:47:26 +0300
commit2d7a21715f25122779e2bed17db8c57aa01e922f (patch)
treecc7a4a04819e442b0a59c5f55098d09802665216 /Documentation/admin-guide
parent3bc2b6a725963bb1b441356873da890e397c1a3f (diff)
downloadlinux-2d7a21715f25122779e2bed17db8c57aa01e922f.tar.xz
mm: sparsemem: use huge PMD mapping for vmemmap pages
The preparation of splitting huge PMD mapping of vmemmap pages is ready, so switch the mapping from PTE to PMD. Link: https://lkml.kernel.org/r/20210616094915.34432-3-songmuchun@bytedance.com Signed-off-by: Muchun Song <songmuchun@bytedance.com> Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com> Cc: Chen Huang <chenhuang5@huawei.com> Cc: David Hildenbrand <david@redhat.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Michal Hocko <mhocko@suse.com> Cc: Oscar Salvador <osalvador@suse.de> Cc: Xiongchun Duan <duanxiongchun@bytedance.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/admin-guide')
-rw-r--r--Documentation/admin-guide/kernel-parameters.txt7
1 files changed, 0 insertions, 7 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 597572ceb8ba..7a7da02b3bc6 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -1572,13 +1572,6 @@
enabled.
Allows heavy hugetlb users to free up some more
memory (6 * PAGE_SIZE for each 2MB hugetlb page).
- This feauture is not free though. Large page
- tables are not used to back vmemmap pages which
- can lead to a performance degradation for some
- workloads. Also there will be memory allocation
- required when hugetlb pages are freed from the
- pool which can lead to corner cases under heavy
- memory pressure.
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