STRUCT DAMOS_WATERMARKS(9)

💧 struct damos_watermarks(9) 💧

okay bestie, welcome to the Kernel API Manual ✨ — this one's all about struct damos_watermarks, and honestly? it's giving "little struct that decides when your scheme gets to be the main character." let's get into it 🫶

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🌸 NAME 🌸

struct damos_watermarks — literally the controls for when a given scheme should be activated. that's the whole vibe. no cap.

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✨ SYNOPSIS ✨

struct damos_watermarks {
    enum damos_wmark_metric metric;
    unsigned long interval;
    unsigned long high;
    unsigned long mid;
    unsigned long low;
 };

like, look at her. five fields. iconic. 💅

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🎀 Members 🎀

• metric — the metric for the watermarks. the thing we're actually measuring, iykyk 🦋
• interval — watermarks check time interval, in microseconds. yes, microseconds. she's precise like that ⏱️
• high — the high watermark 🔥
• mid — the middle watermark 🌈
• low — the low watermark 💀

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🧚 Description 🧚

so here's the tea ☕ — if metric is DAMOS_WMARK_NONE, the scheme is always active. and being active means DAMON does monitoring and applies the action of the scheme to appropriate memory regions. periodt. 🎀

else (as in, not DAMOS_WMARK_NONE, bestie), DAMON checks metric of the system for at least every interval microseconds, and works like this:

• if metric is higher than high, the scheme is inactivated 🙈
• if metric is between mid and low, the scheme is activated ✨
• if metric is lower than low, the scheme is inactivated 😭

literally three little rules and she's running the whole vibe check. obsessed. 💜

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🔎 SEE ALSO 🔎

kernel file ./include/linux/damon.h 📁

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_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_attrs(9), struct damon_ctx(9)

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and that's the whole page, bestie 🫶 — sourced from ./include/linux, dated October 2026, and she's still struct damos_watermarks(9) at the end of the day. slay 💅✨🎀