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b=lLiqC8btuCHiDoIaDtMK3nKE6F8yr4kzmUZVcBu16PG+/5FQiVNJbfveuJTwnZus4 LpqIA/K6vd7gtuCJ9uEp4Kmi6a40P4fvVJX3IOjF9eZrUJisET45Ps2Fs5wIY4aFIq Sl0abzUnuR6ctFMct+7B/XjNSI64r8ZzHf4BqpZ61u3bwCfigyZqH4MmUpwhFZm2yt Sy8Xr90yFlsZ5s/+Wcb1NrvtZo8leVc/BirD4h2fWbGyaILlFo0nmA6Cv1uz2IH1Qe g9p288J2eNqBXLWsVeYHWr7lla9DhN8nsG4OxMmlKWaDIF9xzOhCZJjHNbCAiCc8aK 74/fjYzQGt13A== From: SJ Park To: Cc: SJ Park , Andrew Morton , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH v2 1/7] mm/damon/core: introduce damos_quota_goal->complement Date: Fri, 18 Sep 2026 18:13:50 -0700 Message-ID: <20260919011359.88921-2-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260919011359.88921-1-sj@kernel.org> References: <20260919011359.88921-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: 9ru1w5z8jqfqqhxc46i7heci13deitwp X-Rspam-User: X-Rspamd-Queue-Id: 3772D160006 X-Rspamd-Server: rspam03 X-HE-Tag: 1789780450-944843 X-HE-Meta: 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 cP3Bq59i 5o8JiJeromwycdXGJlW07dhM15OYVYzklRiBFs1pq+5lCLHCGOlRzZhAuYI9mKkyqIyLwYB7AIA+VrtJEruDcWIYNNFheWkqY5OjgrIIp6A0eGDNRbzTQ3yrG7xSIf56kkpHJVEAvx6ZuF5XNNkfODg97mChq+VAtNGeH/9namoISX6sI6lXDGu2EcbdpNV2QntfR+wt4cKIzpfdlT86RNavGfNOyKe53Bq4MCF6AHBFDnNNjT0V3NmsUPrumg8yN33b++bjBCHQNBFMG9M/X2uPMNA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Introduce damos_quota_goal->complement for specifying whether to use a complemented value of the given goal target metric. Add the field to the data structure and implement essential core support. Handle the flag in the quota goal commit and current quota goal metric value retrieval. Signed-off-by: SJ Park --- include/linux/damon.h | 2 ++ mm/damon/core.c | 18 ++++++++++++++++++ 2 files changed, 20 insertions(+) diff --git a/include/linux/damon.h b/include/linux/damon.h index 844b175120f09..78b227875287d 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -175,6 +175,7 @@ enum damos_quota_goal_metric { /** * struct damos_quota_goal - DAMOS scheme quota auto-tuning goal. * @metric: Metric to be used for representing the goal. + * @complement: Use the complement of the metric. * @target_value: Target value of @metric to achieve with the tuning. * @current_value: Current value of @metric. * @nid: Node id. @@ -197,6 +198,7 @@ enum damos_quota_goal_metric { */ struct damos_quota_goal { enum damos_quota_goal_metric metric; + bool complement; unsigned long target_value; unsigned long current_value; /* metric-dependent fields */ diff --git a/mm/damon/core.c b/mm/damon/core.c index 4687b909d42c9..05d1df3746e83 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -1224,6 +1224,7 @@ static int damos_commit_quota_goal( if (!src->target_value) return -EINVAL; dst->metric = src->metric; + dst->complement = src->complement; dst->target_value = src->target_value; if (dst->metric == DAMOS_QUOTA_USER_INPUT) dst->current_value = src->current_value; @@ -3239,6 +3240,23 @@ static void damos_set_quota_goal_current_value(struct damon_ctx *c, default: break; } + if (!goal->complement) + return; + + /* updte current_value to complemented value */ + + /* for user_input, users set complemented value on their own */ + if (goal->metric == DAMOS_QUOTA_USER_INPUT) + return; + if (goal->metric == DAMOS_QUOTA_SOME_MEM_PSI_US) { + goal->current_value = s->quota.reset_interval * 1000 - + goal->current_value; + return; + } + if (goal->current_value < 10000) + goal->current_value = 10000 - goal->current_value; + else + goal->current_value = 0; } /* Return the highest score since it makes schemes least aggressive */ -- 2.47.3