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From: Pavel Begunkov <asml.silence@gmail.com>
To: Colin Walters <walters@verbum.org>,
	Stefan Metzmacher <metze@samba.org>, Jens Axboe <axboe@kernel.dk>,
	io-uring@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org
Subject: Re: [PATCHSET v2 0/6] io_uring: add support for open/close
Date: Fri, 17 Jan 2020 12:32:18 +0300	[thread overview]
Message-ID: <964c01cc-94f5-16b2-cc61-9ee5789b1f43@gmail.com> (raw)
In-Reply-To: <1e8a9e98-67f8-4e2f-8185-040b9979bc1a@www.fastmail.com>

On 1/17/2020 3:44 AM, Colin Walters wrote:
> On Thu, Jan 16, 2020, at 5:50 PM, Stefan Metzmacher wrote:
>> The client can compound a chain with open, getinfo, read, close
>> getinfo, read and close get an file handle of -1 and implicitly
>> get the fd generated/used in the previous request.
> 
> Sounds similar to  https://capnproto.org/rpc.html too.
> 
Looks like just grouping a pack of operations for RPC.
With io_uring we could implement more interesting stuff. I've been
thinking about eBPF in io_uring for a while as well, and apparently it
could be _really_ powerful, and would allow almost zero-context-switches
for some usecases.

1. full flow control with eBPF
- dropping requests (links)
- emitting reqs/links (e.g. after completions of another req)
- chaining/redirecting
of course, all of that with fast intermediate computations in between

2. do long eBPF programs by introducing a new opcode (punted to async).
(though, there would be problems with that)

Could even allow to dynamically register new opcodes within the kernel
and extend it to eBPF, if there will be demand for such things.
-- 
Pavel Begunkov

  parent reply	other threads:[~2020-01-17  9:38 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-07 17:00 [PATCHSET v2 0/6] io_uring: add support for open/close Jens Axboe
2020-01-07 17:00 ` [PATCH 1/6] fs: add namei support for doing a non-blocking path lookup Jens Axboe
2020-01-25 13:15   ` Jeff Layton
2020-01-07 17:00 ` [PATCH 2/6] fs: make build_open_flags() available internally Jens Axboe
2020-01-07 17:00 ` [PATCH 3/6] io_uring: add support for IORING_OP_OPENAT Jens Axboe
2020-01-08 13:05   ` Stefan Metzmacher
2020-01-08 16:20     ` Jens Axboe
2020-01-08 16:32       ` Stefan Metzmacher
2020-01-08 16:40         ` Jens Axboe
2020-01-08 17:04           ` Stefan Metzmacher
2020-01-08 22:53             ` Jens Axboe
2020-01-08 23:03               ` Stefan Metzmacher
2020-01-08 23:05                 ` Jens Axboe
2020-01-08 23:11                   ` Stefan Metzmacher
2020-01-08 23:22                     ` Jens Axboe
2020-01-09 10:40                       ` Stefan Metzmacher
2020-01-09 21:31                         ` Jens Axboe
2020-01-16 22:42                           ` Stefan Metzmacher
2020-01-17  0:16                             ` Jens Axboe
2020-01-07 17:00 ` [PATCH 4/6] fs: move filp_close() outside of __close_fd_get_file() Jens Axboe
2020-01-07 17:00 ` [PATCH 5/6] io-wq: add support for uncancellable work Jens Axboe
2020-01-07 17:00 ` [PATCH 6/6] io_uring: add support for IORING_OP_CLOSE Jens Axboe
2020-01-08 21:17 ` [PATCHSET v2 0/6] io_uring: add support for open/close Stefan Metzmacher
2020-01-08 22:57   ` Jens Axboe
2020-01-08 23:05     ` Stefan Metzmacher
2020-01-09  1:02       ` Jens Axboe
2020-01-09  2:03         ` Jens Axboe
2020-01-16 22:50           ` Stefan Metzmacher
2020-01-17  0:18             ` Jens Axboe
2020-01-20 12:15               ` Stefan Metzmacher
2020-01-20 13:04                 ` Pavel Begunkov
2020-01-17  0:44             ` Colin Walters
2020-01-17  0:51               ` Jens Axboe
2020-01-17  9:32               ` Pavel Begunkov [this message]
2020-01-17 15:21                 ` Jens Axboe
2020-01-17 22:27                   ` Pavel Begunkov
2020-01-17 22:36                     ` Jens Axboe

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