Re: large page patch

From: David Mosberger (
Date: Fri Aug 02 2002 - 01:26:07 EST

>>>>> On Thu, 01 Aug 2002 22:20:53 -0700 (PDT), "David S. Miller" <> said:

  DaveM> From: David Mosberger <> Date:
  DaveM> Thu, 1 Aug 2002 22:24:05 -0700

  DaveM> In my opinion the proposed large-page patch addresses a
  DaveM> relatively pressing need for databases (primarily).

  DaveM> Databases want large pages with IPC_SHM, how can this
  DaveM> special syscal hack address that?

I believe the interface is OK in that regard. AFAIK, Oracle is happy
with it.

  DaveM> It's great for experimentation, but give up syscall slots
  DaveM> for this?

I'm a bit concerned about this, too. My preference would have been to
use the regular mmap() and shmat() syscalls with some
augmentation/hint as to what the preferred page size is (Simon
Winwood's OLS 2002 paper talks about some options here). I like this
because hints could be useful even with a transparent superpage

The original Intel patch did use more of a hint-like approach (the
hint was a simple binary flag though: give me regular pages or give me
large pages), but Linus preferred a separate syscall interface, so the
Intel folks switched over to doing that.

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