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    SubjectRe: [RFC] ipc: introduce shm_rmid_forced sysctl
    On Wed, Jun 29, 2011 at 03:14:36PM -0700, Andrew Morton wrote:
    > What a horrid patch. But given the POSIX (mis?)feature I don't see a
    > better way, and the feature seems desirable. Sigh.
    >
    > What sort of users would want to turn this on, and why?

    Originally, I introduced it into Linux 2.0.x-ow to allow for resource
    limits to be enforced on shared servers, such as with shared web
    hosting. A user is supposed to be limited by RLIMIT_AS * RLIMIT_NPROC.
    (This is awfully inflexible, lacking a separate per-user memory limit,
    but at least it's something.) However, with shared memory segments a
    user could bypass that limit, because those segments don't have to be
    tied to a process. So the patch changed that, requiring that any shm
    segment be tied to a process, or be destroyed.

    Alexander


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