[linux-mm-cc] Re: [lc-devel] Chunk list issues

[Anderson Briglia]

Hi Gupta,

> > I have a doubt related to chunk operations:
> >
> > - I guess you will use the virtual swap as the compressed cache for
> > anon pages, right? If yes, how will you swapin/swapout chunks? If a
> > single chunk points to a portion of a physical page, and the
> > swapin/swapout operations handle entire pages of data.
>
> Yes, vswap is for anon pages. I think you are mistaken somewhere...I'm not using
> bio structs or anything to swapin/out pages from vswap.

Ok. Will be possible to transfer pages from vswap to a 'real' swap area?

> So, for swap out: Get enough free chunks from free list and store compressed
> page in them.

And the free chunks will point to pages inserted into the vswap memory
area? So, all chunks are allocated using the vswap area?

> And, for swap in: chunk_head->chunk_list gives to first chunk and chunks are
> linked. So, you can get data from all these chunks, (maybe) collect them in a
> page, decompress it and return to caller.
>
> I have started implementation for this compression structure and post when its
> ready. This should also reveal possible problems which I don't see now.

Cheers,

Anderson Briglia