STRUCT TRACING_MAP_OPS(9)

✨ struct tracing_map_ops(9) ✨

okay so bestie, this is a page from the Kernel API Manual and it's literally all about struct tracing_map_ops — the callback squad for tracing_map. no cap, it's giving "let the client plug in their own behavior" energy 💅

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🌸 NAME 🌸

struct tracing_map_ops — the callbacks for tracing_map, periodt.

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🦋 SYNOPSIS 🦋

struct tracing_map_ops {
    int (*elt_alloc)(struct tracing_map_elt *elt);
    void (*elt_free)(struct tracing_map_elt *elt);
    void (*elt_clear)(struct tracing_map_elt *elt);
    void (*elt_init)(struct tracing_map_elt *elt);
 };

like, that's the whole struct. four lil function pointers, iconic.

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🎀 Members 🎀

• elt_alloc — bestie, when a tracing_map_elt gets allocated, this function (if you actually defined it) gets called, and it's basically the client's moment to shine: allocate extra data and attach it to the element (tracing_map_elt->private_data is literally meant for exactly that purpose). and when does element allocation happen? before tracing begins — specifically when the client code makes the tracing_map_init call. 🫶
• elt_free — when a tracing_map_elt is freed, this one gets called, and it lets the client-allocated per-element data be freed too. cleanup era. 🧹
• elt_clear — this callback lets per-element, client-defined data be cleared, if applicable. simple as that. ✨
• elt_init — this callback lets per-element, client-defined data be initialized when it's used — i.e. when the element is actually claimed by tracing_map_insert in the context of the map insertion. main character moment for your data fr fr. 👑

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💖 Description 💖

so the methods in this structure define the callback functions for all kinds of operations on a tracing_map — or on objects related to a tracing_map. that's the vibe.

if you want a detailed description of tracing_map_elt objects, go peek at the overview of tracing_map data structures at the beginning of this file. iykyk. 📖

and the important bit, bestie: all the methods below are optional. every single one. no pressure, no forced commitments. 💅

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🌈 SEE ALSO 🌈

• Kernel file ./kernel/trace/tracing_map.h — go read it, it's right there. 🍓

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and that's the page!! mwah 💋 this cutie came from ./kernel/trace, October 2026, and it's struct tracing_map_ops(9) — go forth and trace those maps, bestie 🧚💜