linux-kernel - Re: New AIO API

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Message-ID: <87sj2r6zo4.fsf@rustcorp.com.au>
Date:	Tue, 16 Apr 2013 10:48:35 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Kent Overstreet <koverstreet@...gle.com>
Cc:	linux-aio@...ck.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, lsf-pc@...ts.linux-foundation.org,
	Zach Brown <zab@...hat.com>, Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mark Fasheh <mfasheh@...e.com>,
	Joel Becker <jlbec@...lplan.org>, Jens Axboe <axboe@...nel.dk>,
	Asai Thambi S P <asamymuthupa@...ron.com>,
	Selvan Mani <smani@...ron.com>,
	Sam Bradshaw <sbradshaw@...ron.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Benjamin LaHaise <bcrl@...ck.org>,
	Theodore Ts'o <tytso@....edu>
Subject: Re: New AIO API

Andrew Morton <akpm@...ux-foundation.org> writes:
> On Fri, 12 Apr 2013 15:28:56 -0700 Kent Overstreet <koverstreet@...gle.com> wrote:
>> Those are the main changes (besides adding attributes, of course) that
>> I've made so far. 
>> 
>>  * Get rid of the parallel syscall interface 
>> 
>>    AIO really shouldn't be implementing its own slightly different
>>    syscalls; it should be a mechanism for doing syscalls asynchronously.
>
> Yes.  We got about a twelfth of the way there many years ago
> (google("syslets")) but it died.  A shame.

Yeah, letting the current process keep waiting and creating a new one
which returns is a fascinating idea, but you really need to swizzle the
PIDs so that the "new" one is identical to the old.  Otherwise the API
is unbearable...

Good luck!
Rusty.
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