Re: Fedora 33 System-Wide Change proposal: swap on zram

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On Sun, Jun 07, 2020 at 05:25:15PM -0600, Chris Murphy wrote:
> On Sun, Jun 7, 2020 at 2:48 PM David Kaufmann <astra@xxxxxxxx> wrote:
> >
> > On Sat, Jun 06, 2020 at 05:36:15PM -0600, Chris Murphy wrote:
> > > To me this sounds like too much dependency on swap.
> >
> > That's not what I meant, I wanted to emphasize the different values of
> > disk storage vs. RAM. As said in another email it doesn't matter at all
> > if there is 0% or 90% of disk swap usage, while RAM usage can be quite
> > essential. (This is in case swapped out stuff stays swapped out.)
> 
> Inactive pages that are evicted long term, is a workload that I think
> would benefit from zswap instead. In that case you get the benefit of
> the memory cache for recently used anonymous pages that would
> otherwise result in "swap thrashing" and the "least recently used"
> pages are moved to disk based swap.

Is this how it works?  Previously it was stated that once a page is
swapped to a particular swap device, that's it.  It would be nice if a
page which has been sitting in zram for a while could be swapped out
to the slower / cheaper / larger disk.

Rich.

-- 
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