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| author | Jan Kara <jack@suse.cz> | 2017-11-15 17:37:22 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-11-15 18:21:06 -0800 |
| commit | 76253fbc8fbf6018401755fc5c07814a837cc832 (patch) | |
| tree | 49f17d79cfea0a286ae131e1cee6decf794be693 /mm/filemap.c | |
| parent | 59c66c5f8c4fb823240d70553c1686ce4e4dd331 (diff) | |
| download | lwn-76253fbc8fbf6018401755fc5c07814a837cc832.tar.gz lwn-76253fbc8fbf6018401755fc5c07814a837cc832.zip | |
mm: move accounting updates before page_cache_tree_delete()
Move updates of various counters before page_cache_tree_delete() call.
It will be easier to batch things this way and there is no difference
whether the counters get updated before or after removal from the radix
tree.
Link: http://lkml.kernel.org/r/20171010151937.26984-5-jack@suse.cz
Signed-off-by: Jan Kara <jack@suse.cz>
Acked-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/filemap.c')
| -rw-r--r-- | mm/filemap.c | 49 |
1 files changed, 25 insertions, 24 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index ecf7565ff435..014109e66e4a 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -224,34 +224,35 @@ void __delete_from_page_cache(struct page *page, void *shadow) } } - page_cache_tree_delete(mapping, page, shadow); - - page->mapping = NULL; - /* Leave page->index set: truncation lookup relies upon it */ - /* hugetlb pages do not participate in page cache accounting. */ - if (PageHuge(page)) - return; + if (!PageHuge(page)) { + __mod_node_page_state(page_pgdat(page), NR_FILE_PAGES, -nr); + if (PageSwapBacked(page)) { + __mod_node_page_state(page_pgdat(page), NR_SHMEM, -nr); + if (PageTransHuge(page)) + __dec_node_page_state(page, NR_SHMEM_THPS); + } else { + VM_BUG_ON_PAGE(PageTransHuge(page), page); + } - __mod_node_page_state(page_pgdat(page), NR_FILE_PAGES, -nr); - if (PageSwapBacked(page)) { - __mod_node_page_state(page_pgdat(page), NR_SHMEM, -nr); - if (PageTransHuge(page)) - __dec_node_page_state(page, NR_SHMEM_THPS); - } else { - VM_BUG_ON_PAGE(PageTransHuge(page), page); + /* + * At this point page must be either written or cleaned by + * truncate. Dirty page here signals a bug and loss of + * unwritten data. + * + * This fixes dirty accounting after removing the page entirely + * but leaves PageDirty set: it has no effect for truncated + * page and anyway will be cleared before returning page into + * buddy allocator. + */ + if (WARN_ON_ONCE(PageDirty(page))) + account_page_cleaned(page, mapping, + inode_to_wb(mapping->host)); } + page_cache_tree_delete(mapping, page, shadow); - /* - * At this point page must be either written or cleaned by truncate. - * Dirty page here signals a bug and loss of unwritten data. - * - * This fixes dirty accounting after removing the page entirely but - * leaves PageDirty set: it has no effect for truncated page and - * anyway will be cleared before returning page into buddy allocator. - */ - if (WARN_ON_ONCE(PageDirty(page))) - account_page_cleaned(page, mapping, inode_to_wb(mapping->host)); + page->mapping = NULL; + /* Leave page->index set: truncation lookup relies upon it */ } static void page_cache_free_page(struct address_space *mapping, |