Re: [PATCH 0/3] allow zram to use zbud as underlying allocator

[Vlastimil Babka]

On 09/14/2015 04:12 PM, Vitaly Wool wrote:
> On Mon, Sep 14, 2015 at 4:01 PM, Vlastimil Babka <vbabka@xxxxxxx> wrote:
> > On 09/14/2015 03:49 PM, Vitaly Wool wrote:
> > > While using ZRAM on a small RAM footprint devices, together with
> > > KSM,
> > > I ran into several occasions when moving pages from compressed swap back
> > > into the "normal" part of RAM caused significant latencies in system
> >
> >
> > I'm sure Minchan will want to hear the details of that :)
> >
> > > operation. By using zbud I lose in compression ratio but gain in
> > > determinism, lower latencies and lower fragmentation, so in the coming
> >
> >
> > I doubt the "lower fragmentation" part given what I've read about the design of zbud and zsmalloc?
>
> As it turns out, I see more cases of compaction kicking in and
> significantly more compact_stalls with zsmalloc.

Interesting, I thought that zsmalloc doesn't need contiguous high-order 
pages.

> ~vitaly

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/