This is a note to let you know that I've just added the patch titled
mm: madvise: fix MADV_WILLNEED on shmem swapouts
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mm-madvise-fix-madv_willneed-on-shmem-swapouts.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 55231e5c898c5c03c14194001e349f40f59bd300 Mon Sep 17 00:00:00 2001
From: Johannes Weiner <[email protected]>
Date: Thu, 22 May 2014 11:54:17 -0700
Subject: mm: madvise: fix MADV_WILLNEED on shmem swapouts
From: Johannes Weiner <[email protected]>
commit 55231e5c898c5c03c14194001e349f40f59bd300 upstream.
MADV_WILLNEED currently does not read swapped out shmem pages back in.
Commit 0cd6144aadd2 ("mm + fs: prepare for non-page entries in page
cache radix trees") made find_get_page() filter exceptional radix tree
entries but failed to convert all find_get_page() callers that WANT
exceptional entries over to find_get_entry(). One of them is shmem swap
readahead in madvise, which now skips over any swap-out records.
Convert it to find_get_entry().
Fixes: 0cd6144aadd2 ("mm + fs: prepare for non-page entries in page cache radix
trees")
Signed-off-by: Johannes Weiner <[email protected]>
Reported-by: Hugh Dickins <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Mel Gorman <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
mm/madvise.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -195,7 +195,7 @@ static void force_shm_swapin_readahead(s
for (; start < end; start += PAGE_SIZE) {
index = ((start - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
- page = find_get_page(mapping, index);
+ page = find_get_entry(mapping, index);
if (!radix_tree_exceptional_entry(page)) {
if (page)
page_cache_release(page);
Patches currently in stable-queue which might be from [email protected] are
queue-3.14/mm-filemap-move-radix-tree-hole-searching-here.patch
queue-3.14/lib-radix-tree-add-radix_tree_delete_item.patch
queue-3.14/mm-fs-prepare-for-non-page-entries-in-page-cache-radix-trees.patch
queue-3.14/mm-shmem-save-one-radix-tree-lookup-when-truncating-swapped-pages.patch
queue-3.14/mm-madvise-fix-madv_willneed-on-shmem-swapouts.patch
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