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Date: Thu, 14 Nov 2002 13:46:26 -0800
To: William Lee Irwin III <wli@holomorphy.com>
Cc: David.Mosberger@acm.org, linux-kernel@vger.kernel.org
Subject: Re: [patch] remove hugetlb syscalls
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From: davidm@mostang.com (David Mosberger-Tang)
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>>>>> On Thu, 14 Nov 2002 13:38:22 -0800, William Lee Irwin III <wli@holomorphy.com> said:

  Bill> On Thu, 14 Nov 2002 12:34:11 -0800, William Lee Irwin III
  Bill> said:
  William> (3) ->f_op->mmap() will hand -EINVAL back to userspace
  William> instead of automatically placing the vma, for explicit and
  William> 0 start adresses

  Bill> On Thu, Nov 14, 2002 at 01:31:21PM -0800, David Mosberger-Tang
  Bill> wrote:
  >> This sounds like a receipe for creating unportable programs
  >> because the alignment constraints will be different from one
  >> platform to another.  (Adding gethugepagesize() in libc would
  >> alleviate the problem but it wouldn't solve it completely.)
  >> Overall, it does sound to me that the hugetlbfs is so specialized
  >> that it would be much cleaner to provide a separate interface at
  >> the user-level.  That would leave more flexibility should the
  >> implementation change over time (which it well might).  --david

  Bill> Okay, that's a serious problem. But it's easy to fix; I'll
  Bill> just call the hugepage vma placement functions that are also
  Bill> used by the syscalls.

Sounds good to me.

Thanks,

	--david
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