The patch titled
Subject: mm: multi-gen LRU: simplify arch_has_hw_pte_young() check
has been added to the -mm mm-unstable branch. Its filename is
mm-multi-gen-lru-simplify-arch_has_hw_pte_young-check.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-multi-gen-lru-simplify-arch_has_hw_pte_young-check.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: Yu Zhao <yuzhao@xxxxxxxxxx>
Subject: mm: multi-gen LRU: simplify arch_has_hw_pte_young() check
Date: Wed, 21 Dec 2022 21:19:06 -0700
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@xxxxxxxxxx
Signed-off-by: Yu Zhao <yuzhao@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Michael Larabel <Michael@xxxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxx>
Cc: Roman Gushchin <roman.gushchin@xxxxxxxxx>
Cc: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
--- a/mm/vmscan.c~mm-multi-gen-lru-simplify-arch_has_hw_pte_young-check
+++ a/mm/vmscan.c
@@ -4428,7 +4428,7 @@ static bool try_to_inc_max_seq(struct lr
* 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;
}
_
Patches currently in -mm which might be from yuzhao@xxxxxxxxxx are
mm-multi-gen-lru-rename-lru_gen_struct-to-lru_gen_folio.patch
mm-multi-gen-lru-rename-lrugen-lists-to-lrugen-folios.patch
mm-multi-gen-lru-remove-eviction-fairness-safeguard.patch
mm-multi-gen-lru-remove-aging-fairness-safeguard.patch
mm-multi-gen-lru-shuffle-should_run_aging.patch
mm-multi-gen-lru-per-node-lru_gen_folio-lists.patch
mm-multi-gen-lru-clarify-scan_control-flags.patch
mm-multi-gen-lru-simplify-arch_has_hw_pte_young-check.patch
