The patch titled
Subject: mm-dont-be-stuck-to-rmap-lock-on-reclaim-path-fix
has been added to the -mm mm-unstable branch. Its filename is
mm-dont-be-stuck-to-rmap-lock-on-reclaim-path-fix.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-dont-be-stuck-to-rmap-lock-on-reclaim-path-fix.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Minchan Kim <minchan@xxxxxxxxxx>
Subject: mm-dont-be-stuck-to-rmap-lock-on-reclaim-path-fix
Date: Wed, 4 May 2022 23:11:04 -0700
add comment, per Matthew
Link: https://lkml.kernel.org/r/YnNqeB5tUf6LZ57b@xxxxxxxxxx
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: John Dias <joaodias@xxxxxxxxxx>
Cc: Tim Murray <timmurray@xxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Vladimir Davydov <vdavydov.dev@xxxxxxxxx>
Cc: Martin Liu <liumartin@xxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_idle.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/mm/page_idle.c~mm-dont-be-stuck-to-rmap-lock-on-reclaim-path-fix
+++ a/mm/page_idle.c
@@ -87,6 +87,10 @@ static void page_idle_clear_pte_refs(str
{
struct folio *folio = page_folio(page);
+ /*
+ * Since rwc.try_lock is unused, rwc is effectively immutable, so we
+ * can make it static to save some cycles and stack.
+ */
static struct rmap_walk_control rwc = {
.rmap_one = page_idle_clear_pte_refs_one,
.anon_lock = folio_lock_anon_vma_read,
_
Patches currently in -mm which might be from minchan@xxxxxxxxxx are
mm-dont-be-stuck-to-rmap-lock-on-reclaim-path.patch
mm-dont-be-stuck-to-rmap-lock-on-reclaim-path-fix.patch
