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

Sergey Senozhatsky
2015-09-15T00:49:14Z

On (09/14/15 15:49), 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 operation.
> By using zbud I lose in compression ratio but gain in determinism, lower
> latencies and lower fragmentation, so in the coming patches I tried to
> generalize what I've done to enable zbud for zram so far.
>

do you have CONFIG_PGTABLE_MAPPING enabled or disabled? or
kmap_atomic/memcpy/kunmap_atomic is not the root cause here?
can you provide more details please?

-ss