The patch titled
Subject: mm: fix madvise WILLNEED performance problem
has been removed from the -mm tree. Its filename was
mm-fix-madvise-willneed-performance-problem.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: mm: fix madvise WILLNEED performance problem
The calculation of the end page index was incorrect, leading to a
regression of 70% when running stress-ng. With this fix, we instead
see a performance improvement of 3%.
Link: https://lkml.kernel.org/r/20201109134851.29692-1-willy@xxxxxxxxxxxxx
Fixes: e6e88712e43b ("mm: optimise madvise WILLNEED")
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Reported-by: kernel test robot <rong.a.chen@xxxxxxxxx>
Tested-by: Xing Zhengjun <zhengjun.xing@xxxxxxxxxxxxxxx>
Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: William Kucharski <william.kucharski@xxxxxxxxxx>
Cc: Feng Tang <feng.tang@xxxxxxxxx>
Cc: "Chen, Rong A" <rong.a.chen@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/madvise.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/madvise.c~mm-fix-madvise-willneed-performance-problem
+++ a/mm/madvise.c
@@ -226,7 +226,7 @@ static void force_shm_swapin_readahead(s
struct address_space *mapping)
{
XA_STATE(xas, &mapping->i_pages, linear_page_index(vma, start));
- pgoff_t end_index = end / PAGE_SIZE;
+ pgoff_t end_index = linear_page_index(vma, end + PAGE_SIZE - 1);
struct page *page;
rcu_read_lock();
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
sparc-fix-handling-of-page-table-constructor-failure.patch
mm-move-free_unref_page-to-mm-internalh.patch
mm-page-flags-fix-comment.patch
mm-page_alloc-add-__free_pages-documentation.patch
mm-support-thps-in-zero_user_segments.patch
mm-support-thps-in-zero_user_segments-fix.patch
mm-make-pagecache-tagged-lookups-return-only-head-pages.patch
mm-shmem-use-pagevec_lookup-in-shmem_unlock_mapping.patch
mm-swap-optimise-get_shadow_from_swap_cache.patch
mm-add-fgp_entry.patch
mm-filemap-rename-find_get_entry-to-mapping_get_entry.patch
mm-filemap-add-helper-for-finding-pages.patch
mm-filemap-add-helper-for-finding-pages-fix.patch
mm-filemap-add-mapping_seek_hole_data.patch
mm-filemap-add-mapping_seek_hole_data-fix.patch
iomap-use-mapping_seek_hole_data.patch
mm-add-and-use-find_lock_entries.patch
mm-add-and-use-find_lock_entries-fix.patch
mm-add-an-end-parameter-to-find_get_entries.patch
mm-add-an-end-parameter-to-pagevec_lookup_entries.patch
mm-remove-nr_entries-parameter-from-pagevec_lookup_entries.patch
mm-pass-pvec-directly-to-find_get_entries.patch
mm-remove-pagevec_lookup_entries.patch
mm-truncateshmem-handle-truncates-that-split-thps.patch
mm-truncateshmem-handle-truncates-that-split-thps-fix.patch
mm-filemap-return-only-head-pages-from-find_get_entries.patch
