Re: [PATCH 0/1] iomap regression for aio dio 4k writes

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On Thu, Jun 22, 2023 at 03:55:52AM +0100, Matthew Wilcox wrote:
> Latency is important for reads, but why is it important for writes?
> There's such a thing as a dependent read, but writes are usually buffered
> and we can wait as long as we like for a write to complete.

That was exactly my reasoning on why I did always defer the write
completions in the initial iomap direct I/O code, and until now no
one has complained.

I could see why people care either about synchronous writes, or polled
io_uring writes, for which we might be able to do the work in the
completion thread context, but for aio writes this feels a bit odd.



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