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bh=7NAyhkfQbcxTPtt6Wuep4buJLBzXp37MO61JEyiUHsU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jVbA/nvADP0cj5hfiuCwC6TlLON6/t/yO31DIlKvYC1iFdH9LbvsxLk0sjAUDvqDG voTJWWNodHb86PVFPoavd1lCpIB0J7IMmdcHEsfShFogBolKJ1i8AbX8MAvxsJsgmI 3n6qC6Uhn5NllSe4LEWSJwdnlIsUiFGpyiTFOUsGnSDF/GpJUYMt5ZfyCW5p6ACa4s jBz7BYffQ4d7O4qC5bKvKEV8fey4j/onYserdl1kxQNlzAWwrfRH5h0HW6Ru6CEWhd hDLhNkwwuqd0e2rRonjmvZ4ACNbFK9rM+2nVRxadDRz5s55s3dAyMIrsaYYthhtK3L nePNsyWQz9rww== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 01/11] mm/damon/core: introduce [in]active memory ratio damos quota goal metric Date: Tue, 13 Jan 2026 07:27:06 -0800 Message-ID: <20260113152717.70459-2-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260113152717.70459-1-sj@kernel.org> References: <20260113152717.70459-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: urzfqt94gukfyxgn45xf7sy89ea5fp7d X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 5373480006 X-Rspam-User: X-HE-Tag: 1768318051-726497 X-HE-Meta: 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 dK0ZYNaO lZBr0OEfOeuyci3pDWb74pTYdGBZIDqCofolzg5HybyJJnoozhimk6vi5eRdBLr6oo7WOdA4qHrgEzy/Un6qF6eT1a70kuykoHKEyfq5cCLiLqjoqhTvHObGKkSNboykTq+Q766XW5vFOPiRC1go8K/0ayQ+Kq2LXlLnyJjHLhE1lEBZRf5YfZo1YIXu1R3Qo04pvy3S0NTPwcEw8uw4ZLnDaxRPw8VgTSX/1 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: List-Subscribe: List-Unsubscribe: DAMOS_LRU_[DE]PRIO are DAMOS actions for making balance of active and inactive memory size. There is no appropriate DAMOS quota auto-tuning target metric for the use case. Add two new DAMOS quota goal metrics for the purpose, namely DAMOS_QUOTA_[IN]ACTIVE_MEM_BP. Those will represent the ratio of [in]active memory to total (inactive + active) memory. Hence, users will be able to ask DAMON to, for example, "find hot and cold memory, and move pages of those to active and inactive LRU lists, adjusting the hot/cold thresholds aiming 50:50 active:inactive memory ratio." Signed-off-by: SeongJae Park --- include/linux/damon.h | 4 ++++ mm/damon/core.c | 22 ++++++++++++++++++++++ 2 files changed, 26 insertions(+) diff --git a/include/linux/damon.h b/include/linux/damon.h index 650e7ecfa32b..26fb8e90dff6 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -155,6 +155,8 @@ enum damos_action { * @DAMOS_QUOTA_NODE_MEM_FREE_BP: MemFree ratio of a node. * @DAMOS_QUOTA_NODE_MEMCG_USED_BP: MemUsed ratio of a node for a cgroup. * @DAMOS_QUOTA_NODE_MEMCG_FREE_BP: MemFree ratio of a node for a cgroup. + * @DAMOS_QUOTA_ACTIVE_MEM_BP: Active to total LRU memory ratio. + * @DAMOS_QUOTA_INACTIVE_MEM_BP: Inactive to total LRU memory ratio. * @NR_DAMOS_QUOTA_GOAL_METRICS: Number of DAMOS quota goal metrics. * * Metrics equal to larger than @NR_DAMOS_QUOTA_GOAL_METRICS are unsupported. @@ -166,6 +168,8 @@ enum damos_quota_goal_metric { DAMOS_QUOTA_NODE_MEM_FREE_BP, DAMOS_QUOTA_NODE_MEMCG_USED_BP, DAMOS_QUOTA_NODE_MEMCG_FREE_BP, + DAMOS_QUOTA_ACTIVE_MEM_BP, + DAMOS_QUOTA_INACTIVE_MEM_BP, NR_DAMOS_QUOTA_GOAL_METRICS, }; diff --git a/mm/damon/core.c b/mm/damon/core.c index abda850c28c0..d2ed75e521bd 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -2132,6 +2132,23 @@ static unsigned long damos_get_node_memcg_used_bp( } #endif +/* + * Returns LRU-active or inactive memory to total LRU memory size ratio. + */ +static unsigned int damos_get_in_active_mem_bp(bool active_ratio) +{ + unsigned long active, inactive, total; + + /* This should align with /proc/meminfo output */ + active = global_node_page_state(NR_LRU_BASE + LRU_ACTIVE_ANON) + + global_node_page_state(NR_LRU_BASE + LRU_ACTIVE_FILE); + inactive = global_node_page_state(NR_LRU_BASE + LRU_INACTIVE_ANON) + + global_node_page_state(NR_LRU_BASE + LRU_INACTIVE_FILE); + total = active + inactive; + if (active_ratio) + return active * 10000 / total; + return inactive * 10000 / total; +} static void damos_set_quota_goal_current_value(struct damos_quota_goal *goal) { @@ -2154,6 +2171,11 @@ static void damos_set_quota_goal_current_value(struct damos_quota_goal *goal) case DAMOS_QUOTA_NODE_MEMCG_FREE_BP: goal->current_value = damos_get_node_memcg_used_bp(goal); break; + case DAMOS_QUOTA_ACTIVE_MEM_BP: + case DAMOS_QUOTA_INACTIVE_MEM_BP: + goal->current_value = damos_get_in_active_mem_bp( + goal->metric == DAMOS_QUOTA_ACTIVE_MEM_BP); + break; default: break; } -- 2.47.3