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    SubjectRe: [PATCH] x86 rwsem optimization extreme

    * Zachary Amsden <> wrote:

    > >
    > >Zachary Amsden<> writes
    > >>Incidentally, the cost of putting all the rwsem code inline, using the
    > >>straightforward approach, for git-tip, using defconfig on x86_64 is
    > >>3565 bytes / 20971778 bytes total, or 0.0168%, using gcc 4.4.3.
    > >The nice advantage of putting lock code inline is that it gets
    > >accounted to the caller in all profilers.
    > >
    > >-Andi
    > >
    > Unfortunately, only for the uncontended case. The hot case still ends up
    > in a call to the lock text section.

    Nor is it really true that it's 'a problem for profilers' - call graph
    recording works just fine, in fact it can be better for a call-graph record
    if the locking sites are not sprinkled around the kernel and inlined.


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