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From: Adam Litke <agl@us.ibm.com>
To: Valdis.Kletnieks@vt.edu
Cc: Andrew Morton <akpm@linux-foundation.org>,
Arjan van de Ven <arjan@infradead.org>,
William Lee Irwin III <wli@holomorphy.com>,
Christoph Hellwig <hch@infradead.org>,
Ken Chen <kenchen@google.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: pagetable_ops: Hugetlb character device example
Date: Wed, 21 Mar 2007 15:26:44 -0500 [thread overview]
Message-ID: <1174508804.21684.48.camel@localhost.localdomain> (raw)
In-Reply-To: <200703211951.l2LJpVPS020364@turing-police.cc.vt.edu>
On Wed, 2007-03-21 at 15:51 -0400, Valdis.Kletnieks@vt.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
next prev parent reply other threads:[~2007-03-21 20:26 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-19 20:05 [PATCH 0/7] [RFC] hugetlb: pagetable_operations API (V2) Adam Litke
2007-03-19 20:05 ` [PATCH 1/7] Introduce the pagetable_operations and associated helper macros Adam Litke
2007-03-20 23:24 ` Dave Hansen
2007-03-21 14:50 ` Adam Litke
2007-03-21 15:05 ` Arjan van de Ven
2007-03-21 4:18 ` Nick Piggin
2007-03-21 4:52 ` William Lee Irwin III
2007-03-21 5:07 ` Nick Piggin
2007-03-21 5:41 ` William Lee Irwin III
2007-03-21 6:51 ` Nick Piggin
2007-03-21 7:36 ` Nick Piggin
2007-03-21 10:46 ` William Lee Irwin III
2007-03-21 15:17 ` Adam Litke
2007-03-21 16:00 ` Christoph Hellwig
2007-03-21 23:03 ` Nick Piggin
2007-03-21 23:02 ` Nick Piggin
2007-03-21 23:32 ` William Lee Irwin III
2007-03-19 20:05 ` [PATCH 2/7] copy_vma for hugetlbfs Adam Litke
2007-03-19 20:05 ` [PATCH 3/7] pin_pages for hugetlb Adam Litke
2007-03-19 20:05 ` [PATCH 4/7] unmap_page_range " Adam Litke
2007-03-20 23:27 ` Dave Hansen
2007-03-19 20:05 ` [PATCH 5/7] change_protection " Adam Litke
2007-03-19 20:06 ` [PATCH 6/7] free_pgtable_range " Adam Litke
2007-03-19 20:06 ` [PATCH 7/7] hugetlbfs fault handler Adam Litke
2007-03-20 23:50 ` [PATCH 0/7] [RFC] hugetlb: pagetable_operations API (V2) Dave Hansen
2007-03-21 1:17 ` William Lee Irwin III
2007-03-21 15:55 ` Hugh Dickins
2007-03-21 16:01 ` Christoph Hellwig
2007-03-21 19:43 ` pagetable_ops: Hugetlb character device example Adam Litke
2007-03-21 19:51 ` Valdis.Kletnieks
2007-03-21 20:26 ` Adam Litke [this message]
2007-03-21 22:26 ` William Lee Irwin III
2007-03-21 22:53 ` Matt Mackall
2007-03-21 23:35 ` William Lee Irwin III
2007-03-22 0:31 ` Matt Mackall
2007-03-22 10:38 ` Christoph Hellwig
2007-03-22 15:42 ` Mel Gorman
2007-03-22 18:15 ` Christoph Hellwig
2007-03-23 14:57 ` Mel Gorman
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