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| author | Matthew Wilcox <willy@infradead.org> | 2017-11-21 09:17:59 -0500 |
|---|---|---|
| committer | Matthew Wilcox <willy@infradead.org> | 2018-10-21 10:46:34 -0400 |
| commit | 5c024e6a4ebc1740db9f0f075aaa476210108a97 (patch) | |
| tree | b307dce267f93c3ff7306ce39e9196e3fbc217ef | |
| parent | 74d609585d8bd6083bd9d75bc1fd2c0d3851bcc5 (diff) | |
| download | linux-5c024e6a4ebc1740db9f0f075aaa476210108a97.tar.gz linux-5c024e6a4ebc1740db9f0f075aaa476210108a97.tar.bz2 linux-5c024e6a4ebc1740db9f0f075aaa476210108a97.zip | |
page cache: Convert page deletion to XArray
The code is slightly shorter and simpler.
Signed-off-by: Matthew Wilcox <willy@infradead.org>
| -rw-r--r-- | mm/filemap.c | 31 |
1 files changed, 13 insertions, 18 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index b63caebd1367..414efbdc95df 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -111,31 +111,26 @@ * ->tasklist_lock (memory_failure, collect_procs_ao) */ -static void page_cache_tree_delete(struct address_space *mapping, +static void page_cache_delete(struct address_space *mapping, struct page *page, void *shadow) { - int i, nr; + XA_STATE(xas, &mapping->i_pages, page->index); + unsigned int nr = 1; - /* hugetlb pages are represented by one entry in the radix tree */ - nr = PageHuge(page) ? 1 : hpage_nr_pages(page); + mapping_set_update(&xas, mapping); + + /* hugetlb pages are represented by a single entry in the xarray */ + if (!PageHuge(page)) { + xas_set_order(&xas, page->index, compound_order(page)); + nr = 1U << compound_order(page); + } VM_BUG_ON_PAGE(!PageLocked(page), page); VM_BUG_ON_PAGE(PageTail(page), page); VM_BUG_ON_PAGE(nr != 1 && shadow, page); - for (i = 0; i < nr; i++) { - struct radix_tree_node *node; - void **slot; - - __radix_tree_lookup(&mapping->i_pages, page->index + i, - &node, &slot); - - VM_BUG_ON_PAGE(!node && nr != 1, page); - - radix_tree_clear_tags(&mapping->i_pages, node, slot); - __radix_tree_replace(&mapping->i_pages, node, slot, shadow, - workingset_lookup_update(mapping)); - } + xas_store(&xas, shadow); + xas_init_marks(&xas); page->mapping = NULL; /* Leave page->index set: truncation lookup relies upon it */ @@ -234,7 +229,7 @@ void __delete_from_page_cache(struct page *page, void *shadow) trace_mm_filemap_delete_from_page_cache(page); unaccount_page_cache_page(mapping, page); - page_cache_tree_delete(mapping, page, shadow); + page_cache_delete(mapping, page, shadow); } static void page_cache_free_page(struct address_space *mapping, |