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05158082f6
Backport a preliminary version of Yu Zhao's multi-generational LRU, for improved memory management. Refresh the patches while at it. Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
81 lines
2.4 KiB
Diff
81 lines
2.4 KiB
Diff
From 3008095eb835d207dd7e5b60899aad17f32aa9f7 Mon Sep 17 00:00:00 2001
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From: Yu Zhao <yuzhao@google.com>
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Date: Mon, 25 Jan 2021 21:47:24 -0700
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Subject: [PATCH 09/10] mm: multigenerational lru: Kconfig
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Add configuration options for the multigenerational lru.
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Signed-off-by: Yu Zhao <yuzhao@google.com>
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Tested-by: Konstantin Kharlamov <Hi-Angel@yandex.ru>
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Change-Id: Ic74ea07f8fb5f56e6904a1b80c3c286bc2911635
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---
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mm/Kconfig | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
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1 file changed, 59 insertions(+)
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--- a/mm/Kconfig
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+++ b/mm/Kconfig
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@@ -899,4 +899,63 @@ config SECRETMEM
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source "mm/damon/Kconfig"
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+# the multigenerational lru {
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+config LRU_GEN
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+ bool "Multigenerational LRU"
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+ depends on MMU
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+ # the following options may leave not enough spare bits in page->flags
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+ depends on !MAXSMP && (64BIT || !SPARSEMEM || SPARSEMEM_VMEMMAP)
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+ help
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+ A high performance LRU implementation to heavily overcommit workloads
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+ that are not IO bound. See Documentation/vm/multigen_lru.rst for
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+ details.
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+
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+ Warning: do not enable this option unless you plan to use it because
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+ it introduces a small per-process and per-memcg and per-node memory
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+ overhead.
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+
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+config LRU_GEN_ENABLED
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+ bool "Turn on by default"
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+ depends on LRU_GEN
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+ help
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+ The default value of /sys/kernel/mm/lru_gen/enabled is 0. This option
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+ changes it to 1.
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+
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+ Warning: the default value is the fast path. See
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+ Documentation/static-keys.txt for details.
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+
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+config LRU_GEN_STATS
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+ bool "Full stats for debugging"
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+ depends on LRU_GEN
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+ help
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+ This option keeps full stats for each generation, which can be read
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+ from /sys/kernel/debug/lru_gen_full.
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+
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+ Warning: do not enable this option unless you plan to use it because
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+ it introduces an additional small per-process and per-memcg and
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+ per-node memory overhead.
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+
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+config NR_LRU_GENS
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+ int "Max number of generations"
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+ depends on LRU_GEN
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+ range 4 31
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+ default 7
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+ help
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+ This will use order_base_2(N+1) spare bits from page flags.
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+
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+ Warning: do not use numbers larger than necessary because each
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+ generation introduces a small per-node and per-memcg memory overhead.
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+
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+config TIERS_PER_GEN
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+ int "Number of tiers per generation"
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+ depends on LRU_GEN
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+ range 2 5
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+ default 4
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+ help
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+ This will use N-2 spare bits from page flags.
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+
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+ Larger values generally offer better protection to active pages under
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+ heavy buffered I/O workloads.
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+# }
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+
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endmenu
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