pt_buffer_init_topa(9)

💅 pt_buffer_init_topa — NAME ✨

okay so bestie, <pink>pt_buffer_init_topa</pink> is literally the function that initializes the ToPA table for a pt buffer. that's the whole vibe. it sets the whole thing up. 🎀

this page lives in the Kernel API Manual (section 9), so you know it's the real kernel-dev stuff 👑

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🌸 SYNOPSIS 🌸

int pt_buffer_init_topa (struct pt_buffer *buf , int cpu , unsigned long
nr_pages , gfp_t gfp );

like, it returns an int, and you're handing it a struct pt_buffer *buf, an int cpu, an unsigned long nr_pages, and a gfp_t gfp. four things. that's it. periodt. 💜

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🦋 ARGUMENTS 🦋

• buf — the PT buffer. yes, the actual one. the main character. 🫶
• cpu — the CPU you want to allocate on. tell it where to live bestie.
• nr_pages — the number of pages to allocate. i.e. how much room we're giving this thing ✨
• gfp — the allocation flags. the little knobs that say how the allocation should happen 🔥

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⭐ RETURN ⭐

0 on success, or an error code. so like, zero = slay, anything else = something went sideways 😭

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🧚 SEE ALSO 🧚

the kernel file lives at ./arch/x86/events/intel/pt.c and honestly the whole friend group is here, go say hi:

• struct topa(9)
• struct topa_page(9)
• topa_alloc(9)
• topa_free(9)
• topa_insert_table(9)
• topa_table_full(9)
• topa_insert_pages(9)
• pt_topa_dump(9)
• pt_buffer_advance(9)
• pt_update_head(9)
• pt_buffer_region(9)
• pt_buffer_region_size(9)
• pt_handle_status(9)
• pt_read_offset(9)
• pt_buffer_reset_markers(9)
• pt_buffer_reset_offsets(9)
• pt_buffer_fini_topa(9)
• pt_buffer_setup_aux(9)
• pt_buffer_free_aux(9)
• intel_pt_interrupt(9)

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ngl if you're reading this page you're probably deep in arch/x86/events/intel/pt.c territory, and honestly? iconic behavior. 💀✨

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and that's the whole page bestie, no cap 🫶 this one's from ./arch/x86/events/intel, dated October 2026 — so go forth, initialize that ToPA table, and remember: 0 on success is the only return value we stan 👑💖