* FlexSC influence on io_uring
@ 2022-01-31 18:55 Spencer Baugh
2022-01-31 19:22 ` Jens Axboe
0 siblings, 1 reply; 2+ messages in thread
From: Spencer Baugh @ 2022-01-31 18:55 UTC (permalink / raw
To: io-uring
Hi,
To what extent, if any, was the FlexSC paper an influence on io_uring?
FlexSC is described in a paper from 2010:
https://www.usenix.org/legacy/events/osdi10/tech/full_papers/Soares.pdf
FlexSC is a system for asynchronous system calls aimed at achieving
high-performance by avoiding the cost of system calls, in particular the
locality costs of executing kernel code and user code on the same core.
Implementation-wise, it seems broadly similar to io_uring, in that
system calls are submitted by writing to some location in memory, which
is later picked up by a syscall-execution thread (ala
IORING_SETUP_SQPOLL) which executes it and writes back the result.
I'm just curious if there was any influence from FlexSC on io_uring.
Thanks,
Spencer Baugh
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: FlexSC influence on io_uring
2022-01-31 18:55 FlexSC influence on io_uring Spencer Baugh
@ 2022-01-31 19:22 ` Jens Axboe
0 siblings, 0 replies; 2+ messages in thread
From: Jens Axboe @ 2022-01-31 19:22 UTC (permalink / raw
To: Spencer Baugh, io-uring
On 1/31/22 11:55 AM, Spencer Baugh wrote:
>
> Hi,
>
> To what extent, if any, was the FlexSC paper an influence on io_uring?
>
> FlexSC is described in a paper from 2010:
> https://www.usenix.org/legacy/events/osdi10/tech/full_papers/Soares.pdf
>
> FlexSC is a system for asynchronous system calls aimed at achieving
> high-performance by avoiding the cost of system calls, in particular the
> locality costs of executing kernel code and user code on the same core.
>
> Implementation-wise, it seems broadly similar to io_uring, in that
> system calls are submitted by writing to some location in memory, which
> is later picked up by a syscall-execution thread (ala
> IORING_SETUP_SQPOLL) which executes it and writes back the result.
>
> I'm just curious if there was any influence from FlexSC on io_uring.
Wasn't aware of this paper, if that answers the question. The idea for
async syscalls (to me) date back to the original threadlet/acall ideas
from Zach Brown and Ingo, though my implementation ended up being vastly
different. The API with the rings of shared memory was a pretty obvious
one and not really novel, it's been used in both sw and hw for a long
time.
--
Jens Axboe
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2022-01-31 19:22 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2022-01-31 18:55 FlexSC influence on io_uring Spencer Baugh
2022-01-31 19:22 ` Jens Axboe
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).