tracing_map_update_sum(9)

💅 tracing_map_update_sum(9) — like, the Kernel API Manual, bestie ✨

okay so real talk, this is a page straight out of the Kernel API Manual and it's honestly such a little icon. it does ONE thing and it does it slayfully. let's get into it 🫶

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🌸 NAME 🌸

tracing_map_update_sum — adds a value to a tracing_map_elt's sum field. that's it. that's the whole gig. main character behavior fr fr 💖

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✨ SYNOPSIS ✨

void tracing_map_update_sum (struct tracing_map_elt *elt , unsigned int i , u64 n );

like yes, that's the whole signature. short, sweet, no cap.

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🎀 ARGUMENTS 🎀

• elt — the tracing_map_elt. the little guy we're updating. 🦋
• i — the index of the given sum that belongs to this tracing_map_elt. think of it as the sum's address in the group chat 💅
• n — the value you're adding to the sum. the contribution. the moment. the +1 ✨

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👑 DESCRIPTION 👑

okay so the vibe here is: you take n and you add it to sum i, and that sum lives on the specific tracing_map_elt instance you passed in. that's literally it. no plot twist, no drama, just addition 🔥

and like — important detail bestie — that index i isn't just any random number you made up. it's the index that got returned by the call to tracing_map_add_sum_field back when the tracing map was set up in the first place. so if you're out here picking an i out of thin air… don't 🙈 use the one you got handed earlier. iykyk.

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🌈 SEE ALSO 🌈

everything is connected, it's giving family reunion 🧚

• kernel file ./kernel/trace/tracing_map.c
• tracing_map_read_sum(9)
• tracing_map_set_var(9)
• tracing_map_var_set(9)
• tracing_map_read_var(9)
• tracing_map_read_var_once(9)
• tracing_map_add_sum_field(9)
• tracing_map_add_var(9)
• tracing_map_add_key_field(9)
• tracing_map_insert(9)
• tracing_map_lookup(9)
• tracing_map_destroy(9)
• tracing_map_clear(9)
• tracing_map_create(9)
• tracing_map_init(9)
• tracing_map_destroy_sort_entries(9)
• tracing_map_sort_entries(9)

go read them. all of them. be thorough bestie 💜

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and that's the whole page!! 🌸 this lil baddie lives in ./kernel/trace and the version is dated October 2026 — so yeah, mark your calendars, screenshot it, send it to the group chat, tracing_map_update_sum(9) said see you then ✨💖🎀