On 4/15/21 1:40 AM, Muchun Song wrote: > Add a kernel parameter hugetlb_free_vmemmap to enable the feature of > freeing unused vmemmap pages associated with each hugetlb page on boot. > > We disables PMD mapping of vmemmap pages for x86-64 arch when this > feature is enabled. Because vmemmap_remap_free() depends on vmemmap > being base page mapped. > > Signed-off-by: Muchun Song <songmuc...@bytedance.com> > Reviewed-by: Oscar Salvador <osalva...@suse.de> > Reviewed-by: Barry Song <song.bao....@hisilicon.com> > Reviewed-by: Miaohe Lin <linmia...@huawei.com> > Tested-by: Chen Huang <chenhua...@huawei.com> > Tested-by: Bodeddula Balasubramaniam <boded...@amazon.com> > --- > Documentation/admin-guide/kernel-parameters.txt | 17 +++++++++++++++++ > Documentation/admin-guide/mm/hugetlbpage.rst | 3 +++ > arch/x86/mm/init_64.c | 8 ++++++-- > include/linux/hugetlb.h | 19 +++++++++++++++++++ > mm/hugetlb_vmemmap.c | 24 ++++++++++++++++++++++++ > 5 files changed, 69 insertions(+), 2 deletions(-)
Thanks, Reviewed-by: Mike Kravetz <mike.krav...@oracle.com> -- Mike Kravetz
