STRUCT DAMOS_FILTER(9)

🌸 NAME 🌸

okay bestie, this is the struct damos_filter(9) page from the Kernel API Manual 😌✨. The whole entire vibe is: struct damos_filter - DAMOS action target memory filter. iconic, honestly.

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✨ SYNOPSIS ✨

Here's the struct in all its glory, no cap:

       struct damos_filter {
           enum damos_filter_type type;
           bool matching;
           bool allow;
           union {
             u64 memcg_id;
             struct damon_addr_range addr_range;
             int target_idx;
             struct damon_size_range sz_range;
           };
        };

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🧚 Members 🧚

• type — Type of the target memory. 🎯
• matching — Whether this is for type-matching memory. 🧐
• allow — Whether to include or exclude the matching memory. ✅
• {unnamed_union} — anonymous. literally no name, just vibes 🙈
• memcg_id — Memcg id of the question if type is DAMOS_FILTER_MEMCG. 🫶
• addr_range — Address range if type is DAMOS_FILTER_TYPE_ADDR. 📍
• target_idx — Index of the struct damon_target of damon_ctx->adaptive_targets if type is DAMOS_FILTER_TYPE_TARGET. 🎯
• sz_range — Size range if type is DAMOS_FILTER_TYPE_HUGEPAGE_SIZE. 📏

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🔥 Description 🔥

So before applying damos->action to a memory region, DAMOS checks if each byte of the region matches to this given condition — and if so, it avoids applying the action. literally a byte-by-byte vibe check. 👀

Support of each filter type depends on the running struct damon_operations and the type. so the ops + type combo is lowkey important, bestie. Refer to enum damos_filter_type for more details. ✨

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💖 SEE ALSO 💖

Kernel file ./include/linux/damon.h — go read, bestie, the whole squad is there:

• 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_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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okay that's the whole page, mwah 💋 — footer tea: source/version ./include/linux, date October 2026, page struct damos_filter(9). periodt. 🌈