Re: [RFC for-next v2 0/4] enable pcpu bio caching for IRQ I/O

[Christoph Hellwig]

On Tue, Oct 18, 2022 at 08:50:54PM +0100, Pavel Begunkov wrote:
> This series implements bio pcpu caching for normal / IRQ-driven I/O
> extending REQ_ALLOC_CACHE currently limited to iopoll. The allocation side
> still only works from non-irq context, which is the reason it's not enabled
> by default, but turning it on for other users (e.g. filesystems) is
> as a matter of passing a flag.
> 
> t/io_uring with an Optane SSD setup showed +7% for batches of 32 requests
> and +4.3% for batches of 8.

This looks much nicer to me than the previous attempt exposing the bio
internals to io_uring, thanks.