kernel: 6.1: Synchronize MGLRU patches with upstream

[openwrt/openwrt.git] / target / linux / generic / backport-6.1 / 020-v6.3-08-UPSTREAM-mm-multi-gen-LRU-simplify-arch_has_hw_pte_y.patch

diff --git a/target/linux/generic/backport-6.1/020-v6.3-08-UPSTREAM-mm-multi-gen-LRU-simplify-arch_has_hw_pte_y.patch b/target/linux/generic/backport-6.1/020-v6.3-08-UPSTREAM-mm-multi-gen-LRU-simplify-arch_has_hw_pte_y.patch
new file mode 100644 (file)
index 0000000..adf85b6
--- /dev/null
+++ b/target/linux/generic/backport-6.1/020-v6.3-08-UPSTREAM-mm-multi-gen-LRU-simplify-arch_has_hw_pte_y.patch
@@ -0,0 +1,43 @@
+From 25887d48dff860751a06caa4188bfaf6bfb6e4b2 Mon Sep 17 00:00:00 2001
+From: Yu Zhao <yuzhao@google.com>
+Date: Wed, 21 Dec 2022 21:19:06 -0700
+Subject: [PATCH 08/19] UPSTREAM: mm: multi-gen LRU: simplify
+ arch_has_hw_pte_young() check
+
+Scanning page tables when hardware does not set the accessed bit has
+no real use cases.
+
+Link: https://lkml.kernel.org/r/20221222041905.2431096-9-yuzhao@google.com
+Signed-off-by: Yu Zhao <yuzhao@google.com>
+Cc: Johannes Weiner <hannes@cmpxchg.org>
+Cc: Jonathan Corbet <corbet@lwn.net>
+Cc: Michael Larabel <Michael@MichaelLarabel.com>
+Cc: Michal Hocko <mhocko@kernel.org>
+Cc: Mike Rapoport <rppt@kernel.org>
+Cc: Roman Gushchin <roman.gushchin@linux.dev>
+Cc: Suren Baghdasaryan <surenb@google.com>
+Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
+Bug: 274865848
+(cherry picked from commit f386e9314025ea99dae639ed2032560a92081430)
+Change-Id: I84d97ab665b4e3bb862a9bc7d72f50dea7191a6b
+Signed-off-by: T.J. Mercier <tjmercier@google.com>
+---
+ mm/vmscan.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/mm/vmscan.c b/mm/vmscan.c
+index 0a0e1250ffc87..aa9746f2bc80b 100644
+--- a/mm/vmscan.c
++++ b/mm/vmscan.c
+@@ -4415,7 +4415,7 @@ static bool try_to_inc_max_seq(struct lruvec *lruvec, unsigned long max_seq,
+        * handful of PTEs. Spreading the work out over a period of time usually
+        * is less efficient, but it avoids bursty page faults.
+        */
+-      if (!force_scan && !(arch_has_hw_pte_young() && get_cap(LRU_GEN_MM_WALK))) {
++      if (!arch_has_hw_pte_young() || !get_cap(LRU_GEN_MM_WALK)) {
+               success = iterate_mm_list_nowalk(lruvec, max_seq);
+               goto done;
+       }
+-- 
+2.40.1
+