From: Andres Freund <andres@anarazel.de>
To: Andy Lutomirski <luto@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>,
Stefano Garzarella <sgarzare@redhat.com>,
Christoph Hellwig <hch@lst.de>, Kees Cook <keescook@chromium.org>,
Pavel Begunkov <asml.silence@gmail.com>,
Miklos Szeredi <miklos@szeredi.hu>,
Matthew Wilcox <willy@infradead.org>,
Jann Horn <jannh@google.com>,
Christian Brauner <christian.brauner@ubuntu.com>,
strace-devel@lists.strace.io, io-uring@vger.kernel.org,
Linux API <linux-api@vger.kernel.org>,
Linux FS Devel <linux-fsdevel@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Michael Kerrisk <mtk.manpages@gmail.com>,
Stefan Hajnoczi <stefanha@redhat.com>
Subject: Re: strace of io_uring events?
Date: Tue, 21 Jul 2020 12:56:02 -0700 [thread overview]
Message-ID: <20200721195602.qtncgzddl7y55b6l@alap3.anarazel.de> (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
next prev 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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