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    SubjectRe: [PATCH 0/3] build system: section garbage collection for vmlinux
    Date
    On Friday 07 September 2007 17:31, Daniel Walker wrote:
    > On Thu, 2007-09-06 at 18:07 +0100, Denys Vlasenko wrote:
    > > A bit extended version:
    > >
    > > In the process in making it work I saw ~10% vmlinux size reductions
    > > (which basically matches what Marcelo says) when I wasn't retaining
    > > sections needed for EXPORT_SYMBOLs, but module loading didn't work.
    > >
    > > Thus I fixed that by adding KEEP() directives so that EXPORT_SYMBOLs
    > > are never discarded. This was just one of many fixes until kernel
    > > started to actually boot and work.
    > >
    > > I did that before I posted patches to lkml.
    > > IOW: posted patches are not broken versus module loading.
    >
    > Ok, this is more like the explanation I was looking for..
    >
    > During this thread you seemed to indicate the patches you release
    > reduced the kernel ~10% , but now your saying that was pre-release ,
    > right?

    CONFIG_MODULE=n will save ~10%
    CONFIG_MODULE=y - ~1%

    Exact figure depends on .config (whether you happen to include
    especially "fat" code or not).

    I want to explain a bit where I am coming from. I am working on busybox,
    and last release made busybox smaller by "whopping" 2%. This is the result
    of a hundred or so of small code and data shrinks.

    It basically means that I am close to the point of diminishing returns
    trying to make busybox smaller, and memory wastage on the running
    embedded system is now elsewhere - including kernel.
    --
    vda
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