damon_set_attrs(9)

💅 damon_set_attrs — like, the NAME section, bestie

okay so damon_set_attrs is literally the function that sets attributes for the monitoring. that's it, that's the vibe. 🎀

(this whole page lives in the Kernel API Manual, section 9 — very demure, very kernel-API of it.)

---

✨ SYNOPSIS ✨

int damon_set_attrs (struct damon_ctx *ctx , struct damon_attrs *attrs );

🫶 ARGUMENTS 🫶

• ctx — the monitoring context. the main character, honestly.
• attrs — the monitoring attributes. the supporting cast that makes it all work.

🌸 DESCRIPTION 🌸

so what does this icon actually do? it updates the monitoring results and the next monitoring/damos operation schedules. two-for-one slay. 👑

but — and listen, this is the important part — those things are periodically updated by kdamond, so you gotta call this from safe contexts. like, do not just call it from anywhere, that's not the move. 🙈 what counts as a safe context?

• during damon_ctx setup time, while the kdamond is not yet started ✅
• inside of kdamond_fn ✅

in detail (iykyk): all DAMON API callers directly call this function for the initial setup of damon_ctx, before calling damon_start. some of the API callers also indirectly call this function via damon_call -> damon_commit for online parameter updates. and finally, kdamond_fn itself uses this for applying auto-tuned monitoring intervals. the range, fr fr. 🌈

⏰ lowkey crucial: every time interval is in micro-seconds. yes, micro. don't @ me.

⭐ RETURN ⭐

• 0 on success — we love a clean win ✨
• a negative error code otherwise 😭

💖 SEE ALSO 💖

the whole friend group, no cap:

• Kernel file ./mm/damon/core.c 👑
• damon_is_registered_ops(9)
• damon_register_ops(9)
• damon_select_ops(9)
• damon_nr_accesses_mvsum(9)
• damon_probe_hits_wsum(9)
• damos_filter_for_ops(9)
• damon_set_schemes(9)
• damos_commit_quota_goals(9)
• damos_filters_default_reject(9)
• damon_commit_ctx(9)
• damon_nr_running_ctxs(9)
• damon_start(9)
• damon_stop(9)
• damon_is_running(9)
• damon_kdamond_pid(9)
• damon_call(9)
• damos_walk(9)
• damon_set_region_system_rams_default(9)
• damon_update_region_access_rate(9)
• damon_initialized(9)

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🦋 okay that's the whole page, bestie. go set those attrs (safely!!).

mwah 💋 — this gem dropped in October 2026, source path ./mm/damon, and it's officially a wrap from the Kernel API Manual crew. stay slay, stay in a safe context. 🎀✨