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b=MbPlCZKpIa9lOj8AUJONXGdiS2aKBOANl+x8LvCD7wN/3tBH/k1xZ21qPaPOTgd1/ JQ6KtXiAKUbQtF/268czWsrcAIKAMqWUEOd5YMI2HaveSZkVKBOQEKI+R1GrfEDrOz L9n/QK7uEmuy03W2+7Yc3lG1HjtzKD4RXxfhSMaZjkbSkEpyWBPz1fvlvNNGboeBOi KRemgqA15qfU3IjPJtr2AHIP1eAYyb6+R0Nh7yCUD+2ZKh7wqUawGcv3Oyj4LlEVx8 joZHlZo2O1H5B+yqoalAjodSq8qbWo/UHo06cHVY0PCsirMjc3k6J3nb/xY/Htz9Cz Tx/bOa4/5q2ZA== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 08/11] mm/damon/lru_sort: support active:inactive memory ratio based auto-tuning Date: Tue, 13 Jan 2026 07:27:13 -0800 Message-ID: <20260113152717.70459-9-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: rfat5ochyqtctj3h6xh1rubdae8z3j3j X-Rspam-User: X-Rspamd-Queue-Id: 7FD51140002 X-Rspamd-Server: rspam08 X-HE-Tag: 1768318054-735873 X-HE-Meta: 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 TJvcQgHH Uwbge45FWqGF9nseBtli+MnSgSAmQkMbhzD9ZCTRYm62Ofc4FD0iy/LG+/d2exuoqIRWBhY0REn41wjkxcMYK0WEKFvEJI6zkT1dHCzJTbsuEeDTb7SNaqDW8Fh3w9Q9ZS7bqjLYzK74r9kss/TwteKIovlX8jXl3AI97XifTkBKeuJ062YCb9TflQx74J6aXjrnAEVZyCDs5J3b2lSr0Bdbxko/kHzaDqZOM44Ya5yZQ++V1x5uSkBl3ByqKv1h5CSrE5XOhh3H4aC97JIDktQKIew== 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: Doing DAMOS_LRU_[DE]PRIO with DAMOS_QUOTA_[IN]ACTIVE_MEM_BP based quota auto-tuning can be easy and intuitive, compared to the manual [de]prioritization target access pattern thresholds tuning. For example, users can ask DAMON to "find hot/cold pages and activate/deactivate those aiming 50:50 active:inactive memory size." But DAMON_LRU_SORT has no interface to do that. Add a module parameter for setting the target ratio. Signed-off-by: SeongJae Park --- mm/damon/lru_sort.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/mm/damon/lru_sort.c b/mm/damon/lru_sort.c index f1fdb37b9b47..f3a9dfc246b6 100644 --- a/mm/damon/lru_sort.c +++ b/mm/damon/lru_sort.c @@ -41,6 +41,20 @@ static bool enabled __read_mostly; static bool commit_inputs __read_mostly; module_param(commit_inputs, bool, 0600); +/* + * Desired active to [in]active memory ratio in bp (1/10,000). + * + * While keeping the caps that set by other quotas, DAMON_LRU_SORT + * automatically increases and decreases the effective level of the quota + * aiming the LRU [de]prioritizations of the hot and cold memory resulting in + * this active to [in]active memory ratio. Value zero means disabling this + * auto-tuning feature. + * + * Disabled by default. + */ +static unsigned long active_mem_bp __read_mostly; +module_param(active_mem_bp, ulong, 0600); + /* * Filter [non-]young pages accordingly for LRU [de]prioritizations. * @@ -208,6 +222,26 @@ static struct damos *damon_lru_sort_new_cold_scheme(unsigned int cold_thres) return damon_lru_sort_new_scheme(&pattern, DAMOS_LRU_DEPRIO); } +static int damon_lru_sort_add_quota_goals(struct damos *hot_scheme, + struct damos *cold_scheme) +{ + struct damos_quota_goal *goal; + + if (!active_mem_bp) + return 0; + goal = damos_new_quota_goal(DAMOS_QUOTA_ACTIVE_MEM_BP, active_mem_bp); + if (!goal) + return -ENOMEM; + damos_add_quota_goal(&hot_scheme->quota, goal); + /* aim 0.2 % goal conflict, to keep little ping pong */ + goal = damos_new_quota_goal(DAMOS_QUOTA_INACTIVE_MEM_BP, + 10000 - active_mem_bp + 2); + if (!goal) + return -ENOMEM; + damos_add_quota_goal(&hot_scheme->quota, goal); + return 0; +} + static int damon_lru_sort_add_filters(struct damos *hot_scheme, struct damos *cold_scheme) { @@ -277,6 +311,9 @@ static int damon_lru_sort_apply_parameters(void) damon_set_schemes(param_ctx, &hot_scheme, 1); damon_add_scheme(param_ctx, cold_scheme); + err = damon_lru_sort_add_quota_goals(hot_scheme, cold_scheme); + if (err) + goto out; err = damon_lru_sort_add_filters(hot_scheme, cold_scheme); if (err) goto out; -- 2.47.3