> On Jul 18, 2023, at 08:49, Mike Kravetz <mike.kravetz@xxxxxxxxxx> wrote: > > update_and_free_pages_bulk is designed to free a list of hugetlb pages > back to their associated lower level allocators. This may require > allocating vmemmmap pages associated with each hugetlb page. The > hugetlb page destructor must be changed before pages are freed to lower > level allocators. However, the destructor must be changed under the > hugetlb lock. This means there is potentially one lock cycle per page. > > Minimize the number of lock cycles in update_and_free_pages_bulk by: > 1) allocating necessary vmemmap for all hugetlb pages on the list > 2) take hugetlb lock and clear destructor for all pages on the list > 3) free all pages on list back to low level allocators > > Signed-off-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx> Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx> Thanks.
