tracing_map_read_sum(9)

📦 version 7.3.1, in nixpkgs unstable

💅 tracing_map_read_sum(9) 💅

okay so real talk, bestie — this is a Kernel API Manual page, and today's main character is tracing_map_read_sum(9). yes it's a mouthful, no you're not gonna mess it up, i got you 🫶

✨ NAME ✨

tracing_map_read_sum — it literally just returns the value of a tracing_map_elt's sum field. that's the whole gig. icon behavior, honestly 👑

🌸 SYNOPSIS 🌸

u64 tracing_map_read_sum (struct tracing_map_elt *elt , unsigned int i );

look at that signature. it ate. 🍓

🎀 ARGUMENTS 🎀

  • elt — the tracing_map_elt. like, the element. your guy. your blorbo 💖
  • i — the index of the given sum associated with the tracing_map_elt. it's a number pointing at which sum you want, iykyk ✨

🦋 DESCRIPTION 🦋

so the way this works: you call this and it retrieves the value of the sum i associated with the specified tracing_map_elt instance. that's it. that's the vibe check and it passed 🌈

and here's the part you actually need to remember, bestie: the index i is the index returned by the call to tracing_map_add_sum_field when the tracing map was set up. so don't be out here inventing your own index, okay?? you gotta use the one tracing_map_add_sum_field handed you back at setup time. no cap, this matters 🙈

👑 RETURN 👑

the sum associated with field i for elt. that's what you get back. periodt 💅

🧚 SEE ALSO 🧚

kernel file ./kernel/trace/tracing_map.c, plus the whole friend group:

literally the entire tracing_map squad. go say hi to all of them 🫶

and that's the page!! one more thing for the road — this lil beauty comes from ./kernel/trace in the Kernel API Manual, and the date on it is October 2026. write that down, bestie 🗓️💜

go read your sums, slay, and remember — kernel dev is main character energy fr fr 💖✨🎀

📦 where this page comes from