diff options
Diffstat (limited to 'mm/filemap.c')
| -rw-r--r-- | mm/filemap.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index 0fbdc8e30dd2..23a051a7ef0f 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -1693,6 +1693,11 @@ EXPORT_SYMBOL(pagecache_get_page); * Any shadow entries of evicted pages, or swap entries from * shmem/tmpfs, are included in the returned array. * + * If it finds a Transparent Huge Page, head or tail, find_get_entries() + * stops at that page: the caller is likely to have a better way to handle + * the compound page as a whole, and then skip its extent, than repeatedly + * calling find_get_entries() to return all its tails. + * * Return: the number of pages and shadow entries which were found. */ unsigned find_get_entries(struct address_space *mapping, @@ -1724,8 +1729,15 @@ unsigned find_get_entries(struct address_space *mapping, /* Has the page moved or been split? */ if (unlikely(page != xas_reload(&xas))) goto put_page; - page = find_subpage(page, xas.xa_index); + /* + * Terminate early on finding a THP, to allow the caller to + * handle it all at once; but continue if this is hugetlbfs. + */ + if (PageTransHuge(page) && !PageHuge(page)) { + page = find_subpage(page, xas.xa_index); + nr_entries = ret + 1; + } export: indices[ret] = xas.xa_index; entries[ret] = page; |