STRUCT DAMON_ATTRS(9)

🌸 struct damon_attrs(9) 🌸

okay so this is the Kernel API Manual page for struct damon_attrs — literally the monitoring attributes for accuracy/overhead control. bestie, this is the struct that decides how often DAMON peeks at your memory and how hard it works 💅

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✨ SYNOPSIS ✨

struct damon_attrs {
    unsigned long sample_interval;
    unsigned long aggr_interval;
    unsigned long ops_update_interval;
    struct damon_intervals_goal intervals_goal;
    unsigned long min_nr_regions;
    unsigned long max_nr_regions;
 };

it's giving "small struct, big job" energy, ngl 🫶

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🎀 Members 🎀

• sample_interval — the time between access samplings. like, how often we go "hmm, is this region being touched?" 👀
• aggr_interval — the time between monitor results aggregations. the number-crunching window, basically.
• ops_update_interval — the time between monitoring operations updates. how often the ops get a little refresh ✨
• intervals_goal — the intervals auto-tuning goal. set it and let DAMON tune its own intervals, main character energy fr.
• min_nr_regions — the minimum number of adaptive monitoring regions. the floor, no going below it 💀
• max_nr_regions — the maximum number of adaptive monitoring regions. the ceiling, no going above it 👑

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🌈 Description 🌈

okay so here's the whole vibe. for each sample_interval, DAMON checks whether each region is accessed or not during the last sample_interval. if such access is found, DAMON aggregates the information by increasing damon_region->nr_accesses for aggr_interval time. for each aggr_interval, the count is reset. 🔥

DAMON also checks whether the target memory regions need update (e.g., by mmap calls from the application, in case of virtual memory monitoring) and applies the changes for each ops_update_interval. 🦋

💖 heads up: all time intervals are in micro-seconds. yes, micro. not milli. do not come for me.

please refer to struct damon_operations and struct damon_call_control for more detail — they have the rest of the lore, iykyk 📖✨

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⭐ SEE ALSO ⭐

kernel file ./include/linux/damon.h, plus the whole extended universe bestie:

struct damon_addr_range(9), struct damon_size_range(9), struct damon_region(9), struct damon_target(9), enum damos_action(9), enum damos_quota_goal_metric(9), struct damos_quota_goal(9), enum damos_quota_goal_tuner(9), struct damos_quota(9), enum damos_wmark_metric(9), struct damos_watermarks(9), struct damos_stat(9), enum damos_filter_type(9), struct damos_filter(9), struct damos_walk_control(9), struct damos_access_pattern(9), struct damos_migrate_dests(9), struct damos(9), enum damon_ops_id(9), struct damon_operations(9), struct damon_intervals_goal(9), enum damon_filter_type(9), struct damon_filter(9), struct damon_probe(9), struct damon_ctx(9)

that's a whole friend group right there, it's giving reunion tour 🌸💜

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and that's the page!! sign-off time 🎀 — this little beauty lives under ./include/linux, dated October 2026, and it's struct damon_attrs(9) all day. slay, go tune those intervals bestie ✨💅