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From: Pavel Begunkov <asml.silence@gmail.com>
To: Jens Axboe <axboe@kernel.dk>, Colin Walters <walters@verbum.org>,
	Stefan Metzmacher <metze@samba.org>,
	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: Sat, 18 Jan 2020 01:27:52 +0300
Message-ID: <991faae8-909c-0aed-a9ee-aab01f8db8e9@gmail.com> (raw)
In-Reply-To: <cbdb0621-3bc8-fc41-a365-56b2639e39a0@kernel.dk>

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On 17/01/2020 18:21, Jens Axboe wrote:
> On 1/17/20 2:32 AM, Pavel Begunkov wrote:
>> 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.
> 
> We're also looking into exactly that at Facebook, nothing concrete yet
> though. But it's clear we need it to take full advantage of links at
> least, and it's also clear that it would unlock a lot of really cool
> functionality once we do.
> 
> Pavel, I'd strongly urge you to submit a talk to LSF/MM/BPF about this.
> It's the perfect venue to have some concrete planning around this topic
> and get things rolling.

Sounds interesting, I'll try this, but didn't you intend to do it yourself?
And thanks for the tip!

> 
> https://lore.kernel.org/bpf/20191122172502.vffyfxlqejthjib6@macbook-pro-91.dhcp.thefacebook.com/
> 

-- 
Pavel Begunkov


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  reply index

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-07 17:00 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
2020-01-17 15:21                 ` Jens Axboe
2020-01-17 22:27                   ` Pavel Begunkov [this message]
2020-01-17 22:36                     ` Jens Axboe

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