178 lines
7.5 KiB
Diff
178 lines
7.5 KiB
Diff
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r19mr5173987ybs.290.1621493661349; Wed, 19 May 2021 23:54:21 -0700 (PDT)
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Date: Thu, 20 May 2021 00:53:54 -0600
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In-Reply-To: <20210520065355.2736558-1-yuzhao@google.com>
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Message-Id: <20210520065355.2736558-14-yuzhao@google.com>
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Subject: [PATCH v3 13/14] mm: multigenerational lru: Kconfig
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From: Yu Zhao <yuzhao@google.com>
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To: linux-mm@kvack.org
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Cc: Alex Shi <alexs@kernel.org>, Andi Kleen <ak@linux.intel.com>,
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Andrew Morton <akpm@linux-foundation.org>,
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Dave Chinner <david@fromorbit.com>,
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Dave Hansen <dave.hansen@linux.intel.com>,
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Donald Carr <sirspudd@gmail.com>,
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Hillf Danton <hdanton@sina.com>, Jens Axboe <axboe@kernel.dk>,
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Johannes Weiner <hannes@cmpxchg.org>,
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Jonathan Corbet <corbet@lwn.net>,
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Joonsoo Kim <iamjoonsoo.kim@lge.com>,
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Konstantin Kharlamov <hi-angel@yandex.ru>,
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Marcus Seyfarth <m.seyfarth@gmail.com>,
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Matthew Wilcox <willy@infradead.org>,
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Mel Gorman <mgorman@suse.de>,
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Miaohe Lin <linmiaohe@huawei.com>,
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Michael Larabel <michael@michaellarabel.com>,
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Michal Hocko <mhocko@suse.com>,
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Michel Lespinasse <michel@lespinasse.org>,
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Rik van Riel <riel@surriel.com>,
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Roman Gushchin <guro@fb.com>,
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Tim Chen <tim.c.chen@linux.intel.com>,
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Vlastimil Babka <vbabka@suse.cz>,
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Yang Shi <shy828301@gmail.com>,
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Ying Huang <ying.huang@intel.com>, Zi Yan <ziy@nvidia.com>,
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linux-kernel@vger.kernel.org, lkp@lists.01.org,
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page-reclaim@google.com, Yu Zhao <yuzhao@google.com>,
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Konstantin Kharlamov <Hi-Angel@yandex.ru>
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Content-Type: text/plain; charset="UTF-8"
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Precedence: bulk
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List-ID: <linux-kernel.vger.kernel.org>
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List-Archive: <https://lore.kernel.org/lkml/>
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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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---
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mm/Kconfig | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
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1 file changed, 58 insertions(+)
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diff --git a/mm/Kconfig b/mm/Kconfig
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index 02d44e3420f5..da125f145bc4 100644
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--- a/mm/Kconfig
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+++ b/mm/Kconfig
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@@ -901,4 +901,62 @@ config KMAP_LOCAL
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# struct io_mapping based helper. Selected by drivers that need them
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config IO_MAPPING
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bool
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+
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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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+ 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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--
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2.31.1.751.gd2f1c929bd-goog
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