Re: ZONE_PADDING wastes 4 bytes of the new cacheline

From: Nick Piggin (nickpiggin_at_yahoo.com.au)
Date: 10/22/04

  • Next message: Jan Rychter: "Re: HARDWARE: Open-Source-Friendly Graphics Cards -- Viable?" 
    Date:	Fri, 22 Oct 2004 13:09:47 +1000
To: Andrew Morton <akpm@osdl.org>

    Andrew Morton wrote:
    > Andrea Arcangeli <andrea@novell.com> wrote:
    >
    >>I'm still unsure if the 2.6 lower_zone_protection completely mimics the
    >> 2.4 lowmem_zone_reserve algorithm if tuned by reversing the pages_min
    >> settings accordingly, but I believe it's easier to drop it and replace
    >> with a clear understandable API that as well drops the pages_min levels
    >> that have no reason to exists anymore
    >
    >
    > I'd be OK with wapping over to the watermark version, as long as we have
    > runtime-settable levels.
    >

    Please no "wapping" over :) This release is the first time the allocator
    has been anywhere near working properly in this area.

    Of course, if Andrea shows that the ->protection racket isn't sufficient,
    then yeah.

    > But I'd be worried about making the default values anything other than zero
    > because nobody seems to be hitting the problems.
    >
    > But then again, this get discussed so infrequently that by the time it
    > comes around again I've forgotten all the previous discussion. Ho hum.
    >

    I think they probably should be turned on. A system with a gig of ram
    shouldn't be able to use up all of ZONE_DMA on pagecache. It seems like
    a small price to pay... same goes for very big highmem systems and ZONE_NORMAL.
    -
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  • Next message: Jan Rychter: "Re: HARDWARE: Open-Source-Friendly Graphics Cards -- Viable?"

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