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Tue, 17 Aug 2021 23:31:25 -0700 (PDT) Date: Wed, 18 Aug 2021 00:31:06 -0600 In-Reply-To: <20210818063107.2696454-1-yuzhao@google.com> Message-Id: <20210818063107.2696454-11-yuzhao@google.com> Mime-Version: 1.0 References: <20210818063107.2696454-1-yuzhao@google.com> X-Mailer: git-send-email 2.33.0.rc1.237.g0d66db33f3-goog Subject: [PATCH v4 10/11] mm: multigenerational lru: Kconfig From: Yu Zhao To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, Hillf Danton , page-reclaim@google.com, Yu Zhao , Konstantin Kharlamov Content-Type: text/plain; charset="UTF-8" Authentication-Results: imf11.hostedemail.com; dkim=pass header.d=google.com header.s=20161025 header.b=Jtstdp0V; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf11.hostedemail.com: domain of 3PakcYQYKCBIGCHzs6y66y3w.u64305CF-442Dsu2.69y@flex--yuzhao.bounces.google.com designates 209.85.219.202 as permitted sender) smtp.mailfrom=3PakcYQYKCBIGCHzs6y66y3w.u64305CF-442Dsu2.69y@flex--yuzhao.bounces.google.com X-Stat-Signature: wbnonwezckp6pkry7sy33qudztsfo9q4 X-Rspamd-Queue-Id: C16AFF0058AD X-Rspamd-Server: rspam05 X-HE-Tag: 1629268285-115850 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Add configuration options for the multigenerational lru. Signed-off-by: Yu Zhao Tested-by: Konstantin Kharlamov --- mm/Kconfig | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) diff --git a/mm/Kconfig b/mm/Kconfig index 40a9bfcd5062..4cd257cfdf84 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -889,4 +889,63 @@ config IO_MAPPING config SECRETMEM def_bool ARCH_HAS_SET_DIRECT_MAP && !EMBEDDED +# the multigenerational lru { +config LRU_GEN + bool "Multigenerational LRU" + depends on MMU + # the following options may leave not enough spare bits in page->flags + depends on !MAXSMP && (64BIT || !SPARSEMEM || SPARSEMEM_VMEMMAP) + help + A high performance LRU implementation to heavily overcommit workloads + that are not IO bound. See Documentation/vm/multigen_lru.rst for + details. + + Warning: do not enable this option unless you plan to use it because + it introduces a small per-process and per-memcg and per-node memory + overhead. + +config LRU_GEN_ENABLED + bool "Turn on by default" + depends on LRU_GEN + help + The default value of /sys/kernel/mm/lru_gen/enabled is 0. This option + changes it to 1. + + Warning: the default value is the fast path. See + Documentation/static-keys.txt for details. + +config LRU_GEN_STATS + bool "Full stats for debugging" + depends on LRU_GEN + help + This option keeps full stats for each generation, which can be read + from /sys/kernel/debug/lru_gen_full. + + Warning: do not enable this option unless you plan to use it because + it introduces an additional small per-process and per-memcg and + per-node memory overhead. + +config NR_LRU_GENS + int "Max number of generations" + depends on LRU_GEN + range 4 31 + default 7 + help + This will use order_base_2(N+1) spare bits from page flags. + + Warning: do not use numbers larger than necessary because each + generation introduces a small per-node and per-memcg memory overhead. + +config TIERS_PER_GEN + int "Number of tiers per generation" + depends on LRU_GEN + range 2 5 + default 4 + help + This will use N-2 spare bits from page flags. + + Larger values generally offer better protection to active pages under + heavy buffered I/O workloads. +# } + endmenu -- 2.33.0.rc1.237.g0d66db33f3-goog