On 8/11/21 5:13 AM, Christoph Hellwig wrote: > On Wed, Aug 11, 2021 at 09:26:33AM +0100, Christoph Hellwig wrote: >> I really don't like all the layering violations in here. What is the >> problem with a simple (optional) percpu cache in the bio_set? Something >> like the completely untested patch below: > > A slightly updated version that actually compiles and survives minimal > testing is here: > > http://git.infradead.org/users/hch/block.git/shortlog/refs/heads/bio-cache I like this approach, I've done something very similar in the past. But the key here is the opt-in, to avoid needing IRQ/locking for the cache which defeats the purpose. That's why it was done just for polling, obviously. I'll test a bit and re-spin the series. -- Jens Axboe
