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    SubjectRe: [PATCH 0/8] core-small: Introduce CONFIG_CORE_SMALL from -tiny
    On Sun, Jan 23, 2005 at 12:40:42AM -0800, Andrew Morton wrote:
    > Matt Mackall <> wrote:
    > >
    > > This set of patches introduces a new config option CONFIG_CORE_SMALL
    > > from the -tiny tree for small systems. This series should apply
    > > cleanly against 2.6.11-rc1-mm2.
    > >
    > > When selected, it enables various tweaks to miscellaneous core data
    > > structures to shrink their size on small systems. While each tweak is
    > > fairly small, in aggregate they can save a substantial amount of
    > > memory.
    > You know what I'm going to ask ;) How much memory?

    This stuff is mostly pretty small, a few K per patch. I think these 8
    are about 40k total but my notes are several months old.

    > I wish it didn't have "core" in the name. A little misleading.

    Well I've got another set called NET_SMALL. BASE?

    > Did you think of making CONFIG_CORE_SMALL an integer which has values zero
    > or one?
    > Then you can lose all those ifdefs:
    > #define MAX_PROBE_HASH (255 - CONFIG_CORE_SMALL * 254) /* dorky */


    > #define PID_MAX_DEFAULT (CONFIG_CORE_SMALL ? 0x1000 : 0x8000)
    > #define UIDHASH_BITS (CONFIG_CORE_SMALL ? 3 : 8)
    > #define FUTEX_HASHBITS (CONFIG_CORE_SMALL ? 4 : 8)
    > etc.

    Hmm. I think we'd want a hidden config variable for this and I'm not
    sure how well the config language allows setting an int from a bool.
    And then it would need another name. On the whole, seems more complex
    than what I've done.

    Mathematics is the supreme nostalgia of our time.
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