diff options
| author | Muchun Song <songmuchun@bytedance.com> | 2021-07-01 04:48:25 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-07-01 06:47:26 +0300 |
| commit | 2d7a21715f25122779e2bed17db8c57aa01e922f (patch) | |
| tree | cc7a4a04819e442b0a59c5f55098d09802665216 /Documentation/admin-guide | |
| parent | 3bc2b6a725963bb1b441356873da890e397c1a3f (diff) | |
| download | linux-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.txt | 7 |
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. Format: { on | off (default) } on: enable the feature |