Messages in this thread | | | Date | Tue, 21 Jul 2020 12:56:02 -0700 | From | Andres Freund <> | Subject | Re: strace of io_uring events? |
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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
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