rpma_mr_advise(3)

💖 rpma_mr_advise — the vibe check for your memory registration 💖

ok so bestie, this is the rpma_mr_advise(3) page from the RPMA Programmer's Manual. it's a librpma thing, it's giving "polite suggestions to the kernel", and honestly? iconic. let's get into it 🫶

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✨ NAME ✨

rpma_mr_advise — give advice about an address range in a memory registration

like, you're literally just whispering sweet nothings to your memory registration. "hey girl, maybe cache this? maybe don't?" no cap. 🌸

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🌈 SYNOPSIS 🌈

#include <librpma.h>

struct rpma_mr_local *mr;
int rpma_mr_advise(struct rpma_mr_local *mr, size_t offset, size_t len, int advice,
        uint32_t flags);

look at that signature. so clean. so demure. 💅

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🦋 DESCRIPTION 🦋

rpma_mr_advise() gives advice about an address range in a memory registration. that's the whole thing. it's the advice function. it advises. main character energy fr fr.

the usage parameter specifies the operations that can be performed on the given memory address range.

and for the available advice and flags values, please see ibv_advise_mr(3) — yes bestie, that's a whole other manpage, go read it, i'll wait 😭

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🎀 RETURN VALUE 🎀

rpma_mr_advise() returns 0 on success, or a negative error code on failure.

zero = slay. negative = not slay. that's the whole system. ✨

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💀 ERRORS 💀

rpma_mr_advise() can fail with the following errors:

• RPMA_E_INVAL — in one of the following:
  • the requested range is out of the memory registration bounds
  • the memory registration usage does not allow the specific advice
  • the flags are invalid
• RPMA_E_NOSUPP — the operation is not supported by the system
• RPMA_E_PROVIDER — ibv_mr_advise(3) failed for other errors

lowkey read these carefully — RPMA_E_INVAL is doing a lot of heavy lifting here, it's three separate crimes in one trench coat 🙈

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🔥 SEE ALSO 🔥

• rpma_mr_reg(3)
• ibv_mr_advise(3)
• librpma(7)
• https://pmem.io/rpma/

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and that's the page, bestie!! this was RPMA, dated 01 April 2024, and you can find the whole manual over at pmem.io/rpma. go forth and advise your memory registrations responsibly. mwah 💖✨🎀🦋