On Tuesday 13 October 2015 11:06:44 Jongsung Kim wrote:
> On 10/12/2015 06:27 PM, Arnd Bergmann wrote:
> > How about changing the zcomp code to pass the page pointer instead of the
> > kernel space pointer? That would avoid having to do the kmap_atomic, which
> > can itself be expensive on 32-bit machines and should not be needed here if
> > you have a HW DMA engine doing the compression. Arnd
>
> Mainline zram uses lzo / lz4 library functions as backend. Using kmap_atomic
> and passing address look reasonable.
Yes, I know, but changing this to do the kmap_atomic in the backend
seems better here if you are adding another backend that doesn't
want or need the kmap_atomic.
Arnd
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