Re: [PATCH 3/5] zram: use zram_slot_lock instead of raw bit_spin_lock op

[Sergey Senozhatsky]

On (04/03/17 15:34), Minchan Kim wrote:
[..]
> > c) spin_locks probably have better fairness guarantees
> 
> In fact, it wouldn't be an imporant because zram's slot lock contention
> is not heavy.

mostly agree. I think (and I may be mistaken) direct IO
causes contention; but direct IO is probably not a usual
zram workload.

> > what do you think? can we, in this patch set, also replce bit
> > spin_locks with a normal spin_lock?
> 
> With changing only zram side from bit_spin_lock to spin_lock,
> it would be crippled. I mean zsmalloc should be changed, too
> and it's really hard. :(

hm, good point.

	-ss