linux-kernel - Re: pagetable_ops: Hugetlb character device example

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]

Message-Id: <1174508804.21684.48.camel@localhost.localdomain>
Date:	Wed, 21 Mar 2007 15:26:44 -0500
From:	Adam Litke <agl@...ibm.com>
To:	Valdis.Kletnieks@...edu
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	William Lee Irwin III <wli@...omorphy.com>,
	Christoph Hellwig <hch@...radead.org>,
	Ken Chen <kenchen@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: pagetable_ops: Hugetlb character device example

On Wed, 2007-03-21 at 15:51 -0400, Valdis.Kletnieks@...edu wrote:
> On Wed, 21 Mar 2007 14:43:48 CDT, Adam Litke said:
> > The main reason I am advocating a set of pagetable_operations is to
> > enable the development of a new hugetlb interface.
> 
> Do you have an exit strategy for the *old* interface?

Not really.  Hugetlbfs needs to be kept around for a number of reasons.
It was designed to support MAP_SHARED mappings and IPC shm segments.  It
is probably still the best interface for those jobs.  Of course
hugetlbfs has lots of users so we must preserve the interface for them.

But... once hugetlbfs is abstracted behind pagetable_operations, you
would have the option of configuring it out of the kernel without losing
access to huge pages by other means (such as the character device).

-- 
Adam Litke - (agl at us.ibm.com)
IBM Linux Technology Center

-
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/