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From: Andres Freund <[email protected]>
To: Andy Lutomirski <[email protected]>
Cc: Jens Axboe <[email protected]>,
	Stefano Garzarella <[email protected]>,
	Christoph Hellwig <[email protected]>, Kees Cook <[email protected]>,
	Pavel Begunkov <[email protected]>,
	Miklos Szeredi <[email protected]>,
	Matthew Wilcox <[email protected]>,
	Jann Horn <[email protected]>,
	Christian Brauner <[email protected]>,
	[email protected], [email protected],
	Linux API <[email protected]>,
	Linux FS Devel <[email protected]>,
	LKML <[email protected]>,
	Michael Kerrisk <[email protected]>,
	Stefan Hajnoczi <[email protected]>
Subject: Re: strace of io_uring events?
Date: Tue, 21 Jul 2020 12:56:02 -0700	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <CALCETrV_tOziNJOp8xanmCU0yJEHcGQk0TBxeiK4U7AVewkgAw@mail.gmail.com>

Hi,

On 2020-07-21 12:44:09 -0700, Andy Lutomirski wrote:
> Can you enlighten me?  I don't see any iov_iter_get_pages() calls or
> equivalents.  If an IO is punted, how does the data end up in the
> io_uring_enter() caller's mm?

For operations needing that io_op_def.needs_mm is true. Which is checked
by io_prep_async_work(), adding the current mm to req. On the wq side
io_wq_switch_mm() uses that mm when executing the queue entry.

Greetings,

Andres Freund

  parent reply	other threads:[~2020-07-21 19:56 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-15 11:12 strace of io_uring events? Miklos Szeredi
2020-07-15 14:35 ` Andy Lutomirski
2020-07-15 17:11   ` Matthew Wilcox
2020-07-15 19:42     ` Pavel Begunkov
2020-07-15 20:09       ` Miklos Szeredi
2020-07-15 20:20         ` Pavel Begunkov
2020-07-15 23:07           ` Kees Cook
2020-07-16 13:14             ` Stefano Garzarella
2020-07-16 15:12               ` Kees Cook
2020-07-17  8:01                 ` Stefano Garzarella
2020-07-21 15:27                   ` Andy Lutomirski
2020-07-21 15:31                     ` Jens Axboe
2020-07-21 17:23                       ` Andy Lutomirski
2020-07-21 17:30                         ` Jens Axboe
2020-07-21 17:44                           ` Andy Lutomirski
2020-07-21 18:39                             ` Jens Axboe
2020-07-21 19:44                               ` Andy Lutomirski
2020-07-21 19:48                                 ` Jens Axboe
2020-07-21 19:56                                 ` Andres Freund [this message]
2020-07-21 19:37                         ` Andres Freund
2020-07-21 15:58                     ` Stefano Garzarella
2020-07-23 10:39                       ` Stefan Hajnoczi
2020-07-23 13:37                       ` Colin Walters
2020-07-24  7:25                         ` Stefano Garzarella
2020-07-16 13:17             ` Aleksa Sarai
2020-07-16 15:19               ` Kees Cook
2020-07-17  8:17               ` Cyril Hrubis
2020-07-16 16:24             ` Andy Lutomirski
2020-07-16  0:12     ` tytso

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