Re: ZONE_PADDING wastes 4 bytes of the new cacheline

From: Andrea Arcangeli (andrea_at_novell.com)
Date: 10/25/04

  • Next message: Lennert Buytenhek: "bttv hang problem on 2.6.8" 
    Date:	Mon, 25 Oct 2004 15:51:10 +0200
To: Nick Piggin <nickpiggin@yahoo.com.au>

    On Mon, Oct 25, 2004 at 10:49:32PM +1000, Nick Piggin wrote:
    > The current stuff is pretty crufty. I think your changes are
    > far better (aside from the minor fact they won't compile!).

    ;) yes, I still have to finish hooking the new code into the
    page_alloc.c, this was just a preview.

    dropping pages_xx would have been a bigger change so I'm avoiding it for
    now since I agree I would need to add more fields than just min/low/high
    for the realtime and GFP_HIGH features (and most important I couldn't
    remove those 2 branches anywyas). In 2.4 I was ignoring __GFP_HIGH. I
    doubt it makes much difference in practice, but it makes sense in theory
    so I'll keep those new features of course (especially the RT one could
    help in practice too).

    > Also, switching to a calculation that has seen some real-world
    > use would be a good idea before we think about turning it on
    > by default.

    agreed. the value tuning is quite simple to understand this way, it is
    tuned exactly to start to reserve the entire lowmem on a 32G x86 box.
    31G/32 = 0.9G > 800m.
    -
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  • Next message: Lennert Buytenhek: "bttv hang problem on 2.6.8"

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