linux-kernel - Re: [rfc] increase struct page size?!

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

Date:	Sun, 20 May 2007 00:26:05 -0700
From:	William Lee Irwin III <wli@...omorphy.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Nick Piggin <npiggin@...e.de>,
	Christoph Lameter <clameter@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	linux-arch@...r.kernel.org
Subject: Re: [rfc] increase struct page size?!

On Sat, 19 May 2007 11:15:01 -0700 William Lee Irwin III <wli@...omorphy.com> wrote:
>> Much the same holds for the atomic_t's; 32 + PAGE_SHIFT is
>> 44 bits or more, about as much as is possible, and one reference per
>> page per page is not even feasible. Full-length atomic_t's are just
>> not necessary.

On Sat, May 19, 2007 at 03:09:34PM -0700, Andrew Morton wrote:
> You can overflow a page's refcount by mapping it 4G times.  That requires
> 32GB of pagetable memory.  It's quite feasible with remap_file_pages().

Oh dear, worst-case app behavior. I'm just wrong.


-- wli
-
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/