diff options
Diffstat (limited to 'target/linux/generic/backport-5.15/020-v6.3-28-mm-multi-gen-LRU-simplify-arch_has_hw_pte_young-chec.patch')
| -rw-r--r-- | target/linux/generic/backport-5.15/020-v6.3-28-mm-multi-gen-LRU-simplify-arch_has_hw_pte_young-chec.patch | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.15/020-v6.3-28-mm-multi-gen-LRU-simplify-arch_has_hw_pte_young-chec.patch b/target/linux/generic/backport-5.15/020-v6.3-28-mm-multi-gen-LRU-simplify-arch_has_hw_pte_young-chec.patch new file mode 100644 index 0000000000..a6c7b019ce --- /dev/null +++ b/target/linux/generic/backport-5.15/020-v6.3-28-mm-multi-gen-LRU-simplify-arch_has_hw_pte_young-chec.patch @@ -0,0 +1,39 @@ +From cf3297e4c7a928da8b2b2f0baff2f9c69ea57952 Mon Sep 17 00:00:00 2001 +From: Yu Zhao <yuzhao@google.com> +Date: Wed, 21 Dec 2022 21:19:06 -0700 +Subject: [PATCH 28/29] 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> +--- + mm/vmscan.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +diff --git a/mm/vmscan.c b/mm/vmscan.c +index 4bcb93df316c..3f6874a69886 100644 +--- a/mm/vmscan.c ++++ b/mm/vmscan.c +@@ -4144,7 +4144,7 @@ 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; + } +-- +2.40.0 + |