On (03/13/18 22:58), Minchan Kim wrote:
> > > If it is static, we can do this in zram_init? I believe it's more readable in that
> > > it's never changed betweens zram instances.
> >
> > We need to have at least one pool, because pool decides where the
> > watermark is. At zram_init() stage we don't have a pool yet. We
> > zs_create_pool() in zram_meta_alloc() so that's why I put
> > zs_huge_class_size() there. I'm not in love with it, but that's
> > the only place where we can have it.
>
> Fair enough. Then what happens if client calls zs_huge_class_size
> without creating zs_create_pool?
Will receive 0.
One of the version was returning SIZE_MAX in such case.
size_t zs_huge_class_size(void)
{
+ if (unlikely(!huge_class_size))
+ return SIZE_MAX;
return huge_class_size;
}
> I think we should make zs_huge_class_size has a zs_pool as argument.
Can do, but the param will be unused. May be we can do something
like below instead:
size_t zs_huge_class_size(void)
{
+ if (unlikely(!huge_class_size))
+ return 3 * PAGE_SIZE / 4;
return huge_class_size;
}
Should do no harm (unless I'm missing something).
-ss
