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    SubjectRe: Avoiding OOM on overcommit...?
    On Sun, 26 Mar 2000, Richard Gooch wrote:
    >Linda Walsh writes:
    >> David Whysong wrote:
    >> > If you run out of a resource, the system should not crash. The kernel just
    >> > has to free up the resource. A convenient way of doing that is to kill a
    >> > user process.
    >>
    >> Then you have violated the integrity of the user-process
    >> space. Tell me, which processes are killed when the system runs out
    >> file descriptors? How about processes? Disk space? Why are you
    >> treating memory differently?
    >
    >Because it's different (read harder)? I still haven't seen a
    >description of how we handle stack exhaustion properly. All we can do
    >there is kill the offending process.

    That's true, but there are other good reasons. Here are two: memory can be
    implicitly allocated, and the kernel uses memory dynamically.

    And actually it isn't all _that_ different. The kernel has to deny a
    resource to user-space if that resource is used up. Most programs will
    cease to function if you deny them a resource that they really need.
    Memory is the most fundamental of resources.


    Dave

    David Whysong dwhysong@physics.ucsb.edu
    Astrophysics graduate student University of California, Santa Barbara
    My public PGP keys are on my web page - http://www.physics.ucsb.edu/~dwhysong
    DSS PGP Key 0x903F5BD6 : FE78 91FE 4508 106F 7C88 1706 B792 6995 903F 5BD6
    D-H PGP key 0x5DAB0F91 : BC33 0F36 FCCD E72C 441F 663A 72ED 7FB7 5DAB 0F91


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