6 ms·

If you use io_uring to implement the Promise API, do you call it iou_ring?

by cormacrelf 4y ago

laerus 4y ago
in the Future this will be funny
- svieira 4y ago
  The only Task remaining is to wait until that Future is joined.
kzrdude 4y ago
Why is it called "uring" anyway, what's the u for?
- erincandescent 4y ago
  Userspace
- wyldfire 4y ago
  The letter u in contexts like these is usually used to represent the greek letter mu -- μ -- and like the SI units prefix indicates "micro". It might not be the case for io_uring, but that's what I'd assumed.
  - taskforcegemini 4y ago
    that's what I thought as well. and something in relation to "micro kernel"
  - WJW 4y ago
    The "u" in "uring" has nothing to do with its size but rather with it being a "userspace ring". The ring buffers used by this particular API reside in userspace rather than in kernel memory.
    - axboe 4y ago
      This is correct, the "u" is for userspace/usermapped. The memory is actually allocate by the kernel, but it's mapped into the applications address space.
    - loeg 4y ago
      > The ring buffers used by this particular API reside in userspace rather than in kernel memory. More specifically, the physical pages backing these ring buffers are pinned and mapped into both address spaces. (The kernel needs to be able to read submissions (sqes) off of it and write completions (cqes) into it, and could not do that if it were only mapped in userspace, or could be paged out.)
- localplume 4y ago
  unlocked ring? the ring buffers are lock free. I'm not sure it stands for userspace since the ring buffers are shared between kernel and userspace, thats the core of io_uring, so that seems kind of misleading.
  - riceart 4y ago
    Ring buffers for the most part are typically lock free, so that’s a bit redundant. The special part is that the ring is directly accessible from userspace at all, as previously any ring buffer is internal.
- Conscat 4y ago
  I have struggled searching for any evidence, but most people seem to think it's "userspace".

If you use io_uring to implement the Promise API, do you call it iou_ring?

laerus 4y ago

in the Future this will be funny

svieira 4y ago
The only Task remaining is to wait until that Future is joined.

kzrdude 4y ago

Why is it called "uring" anyway, what's the u for?

erincandescent 4y ago
Userspace
wyldfire 4y ago
The letter u in contexts like these is usually used to represent the greek letter mu -- μ -- and like the SI units prefix indicates "micro". It might not be the case for io_uring, but that's what I'd assumed.
- taskforcegemini 4y ago
  that's what I thought as well. and something in relation to "micro kernel"
- WJW 4y ago
  The "u" in "uring" has nothing to do with its size but rather with it being a "userspace ring". The ring buffers used by this particular API reside in userspace rather than in kernel memory.
  - axboe 4y ago
    This is correct, the "u" is for userspace/usermapped. The memory is actually allocate by the kernel, but it's mapped into the applications address space.
  - loeg 4y ago
    > The ring buffers used by this particular API reside in userspace rather than in kernel memory. More specifically, the physical pages backing these ring buffers are pinned and mapped into both address spaces. (The kernel needs to be able to read submissions (sqes) off of it and write completions (cqes) into it, and could not do that if it were only mapped in userspace, or could be paged out.)
localplume 4y ago
unlocked ring? the ring buffers are lock free. I'm not sure it stands for userspace since the ring buffers are shared between kernel and userspace, thats the core of io_uring, so that seems kind of misleading.
- riceart 4y ago
  Ring buffers for the most part are typically lock free, so that’s a bit redundant. The special part is that the ring is directly accessible from userspace at all, as previously any ring buffer is internal.
Conscat 4y ago
I have struggled searching for any evidence, but most people seem to think it's "userspace".