Re: [RFC] zram: sleepable async read bio completion

[Christoph Hellwig]

On Wed, Mar 04, 2026 at 02:15:03PM +0900, Sergey Senozhatsky wrote:
> that async read back is not trivial anymore - zram needs to decompress
> the page upon bio completion.  The problem is that bio completion is
> called from atomic context, while zram decompression is sleepable.
> So at this point we have to deffer the decompression to a workqueue,
> which adds (painful) latency to the read path.  We clearly would like
> to avoid that workquque offloading.  What can we do about it?

Nothing.  bi_end_io is called from hard/softirq context usually.