linux-kernel - RE: [PATCH V2 1/4] Frontswap (was Transcendent Memory): swap data structure changes

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Wed, 2 Jun 2010 17:10:36 -0700 (PDT)
From:	Dan Magenheimer <dan.magenheimer@...cle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org, jeremy@...p.org,
	hugh.dickins@...cali.co.uk, ngupta@...are.org, JBeulich@...ell.com,
	chris.mason@...cle.com, kurt.hackel@...cle.com,
	dave.mccracken@...cle.com, npiggin@...e.de, riel@...hat.com,
	avi@...hat.com, pavel@....cz, konrad.wilk@...cle.com
Subject: RE: [PATCH V2 1/4] Frontswap (was Transcendent Memory): swap data
 structure changes

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