RE: [PATCH V2 1/4] Frontswap (was Transcendent Memory): swap datastructure changes

[Dan Magenheimer]

> > --- linux-2.6.34/include/linux/swap.h	2010-05-16 15:17:36.000000000
> -0600
> > +++ linux-2.6.34-frontswap/include/linux/swap.h	2010-05-24
> 10:13:41.000000000 -0600
> > @@ -182,6 +182,8 @@ struct swap_info_struct {
> >  	struct block_device *bdev;	/* swap device or bdev of swap file
> */
> >  	struct file *swap_file;		/* seldom referenced */
> >  	unsigned int old_block_size;	/* seldom referenced */
> > +	unsigned long *frontswap_map;	/* frontswap in-use, one bit per
> page */
> > +	unsigned int frontswap_pages;	/* frontswap pages in-use counter
> */
> 
> Is a 32-bit uint large enough?  Maybe there are other things in swap
> which restrict us to less than 16TB, dunno.

Yes, the same data structure has "unsigned int pages" which is
the "total of usable pages" in the swap device.  If/when
"pages" changes to an unsigned long (or long long), then
"frontswap_pages" should change also.

Thanks,
Dan
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