The quilt patch titled
Subject: buffer: use bdev_getblk() to avoid memory reclaim in readahead path
has been removed from the -mm tree. Its filename was
buffer-use-bdev_getblk-to-avoid-memory-reclaim-in-readahead-path.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: buffer: use bdev_getblk() to avoid memory reclaim in readahead path
Date: Thu, 14 Sep 2023 16:00:07 +0100
__getblk() adds __GFP_NOFAIL, which is unnecessary for readahead; we're
quite comfortable with the possibility that we may not get a bh back.
Switch to bdev_getblk() which does not include __GFP_NOFAIL.
Link: https://lkml.kernel.org/r/20230914150011.843330-5-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Hui Zhu <teawater@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/buffer.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/fs/buffer.c~buffer-use-bdev_getblk-to-avoid-memory-reclaim-in-readahead-path
+++ a/fs/buffer.c
@@ -1465,7 +1465,9 @@ EXPORT_SYMBOL(__getblk_gfp);
*/
void __breadahead(struct block_device *bdev, sector_t block, unsigned size)
{
- struct buffer_head *bh = __getblk(bdev, block, size);
+ struct buffer_head *bh = bdev_getblk(bdev, block, size,
+ GFP_NOWAIT | __GFP_MOVABLE);
+
if (likely(bh)) {
bh_readahead(bh, REQ_RAHEAD);
brelse(bh);
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
mm-make-lock_folio_maybe_drop_mmap-vma-lock-aware.patch
mm-call-wp_page_copy-under-the-vma-lock.patch
mm-handle-shared-faults-under-the-vma-lock.patch
mm-handle-cow-faults-under-the-vma-lock.patch
mm-handle-read-faults-under-the-vma-lock.patch
mm-handle-write-faults-to-ro-pages-under-the-vma-lock.patch
