The patch titled
Subject: mm/swap_state: skip meaningless swap cache readahead when ra_info.win == 0
has been removed from the -mm tree. Its filename was
mm-swap_state-skip-meaningless-swap-cache-readahead-when-ra_infowin-==-0.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Subject: mm/swap_state: skip meaningless swap cache readahead when ra_info.win == 0
swap_ra_info() may leave ra_info untouched in non_swap_entry() case as
page table lock is not held. In this case, we have ra_info.nr_pte == 0
and it is meaningless to continue with swap cache readahead. Skip such
ops by init ra_info.win = 1.
[akpm@xxxxxxxxxxxxxxxxxxxx: clean up struct init]
Link: https://lkml.kernel.org/r/20201009133059.58407-1-linmiaohe@xxxxxxxxxx
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/swap_state.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/mm/swap_state.c~mm-swap_state-skip-meaningless-swap-cache-readahead-when-ra_infowin-==-0
+++ a/mm/swap_state.c
@@ -839,7 +839,9 @@ static struct page *swap_vma_readahead(s
swp_entry_t entry;
unsigned int i;
bool page_allocated;
- struct vma_swap_readahead ra_info = {0,};
+ struct vma_swap_readahead ra_info = {
+ .win = 1,
+ };
swap_ra_info(vmf, &ra_info);
if (ra_info.win == 1)
_
Patches currently in -mm which might be from linmiaohe@xxxxxxxxxx are
