Re: [PATCHv4 02/17] zram: do not use per-CPU compression streams

[Sergey Senozhatsky]

On (25/02/03 21:00), Yosry Ahmed wrote:
> On Mon, Feb 03, 2025 at 12:49:42PM +0900, Sergey Senozhatsky wrote:
> > On (25/02/01 17:21), Kairui Song wrote:
> FWIW, I am not familiar at all with the zram code but zswap uses per-CPU
> acomp contexts with a mutex instead of a spinlock. So the task uses the
> context of the CPU that it started on, but it can be preempted or
> migrated and end up running on a different CPU.

Thank you for the idea.  We couldn't do that before (in zram), in a
number of cases per-CPU stream was taken from atomic context (under
zram table entry spinlock/bit-spinlock), but it's possible now
because entry lock is preemptible.