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    SubjectRe: x86, ARM, PARISC, PPC, MIPS and Sparc folks please run this
    On Wed, Sep 03, 2003 at 08:41:34AM +0100, Jamie Lokier wrote:
    > Russell King wrote:
    > > > > Multiple mappings of the same object rarely occur in my experience, so
    > > > > the resulting performance loss caused by working around the cache and
    > > > > writebuffer is something we can live with.
    > > >
    > > > Multiple *writable* mappings. Don't forget about libc et al.
    > >
    > > I mean in the same group of threads with the same struct mm, not the whole
    > > system.
    >
    > Larry means that it's perfectly normal for libc to map the same file
    > more than once: you have the code section and the data section.

    Code is read-only, data is read-write and is copy on write. Therefore
    its a different scenario.

    Practical tests indicate that the vast majority of applications do not
    trip the test.

    You're right in theory, but I don't particularly care about theory when
    its real life which matters.

    --
    Russell King (rmk@arm.linux.org.uk) The developer of ARM Linux
    http://www.arm.linux.org.uk/personal/aboutme.html

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