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    SubjectRe: Break 2.4 VM in five easy steps


    On Wed, 6 Jun 2001, Andrew Morton wrote:

    > "Jeffrey W. Baker" wrote:
    > >
    > > Because the 2.4 VM is so broken, and
    > > because my machines are frequently deeply swapped,
    >
    > The swapoff algorithms in 2.2 and 2.4 are basically identical.
    > The problem *appears* worse in 2.4 because it uses lots
    > more swap.
    >
    > > they can sometimes take over 30 minutes to shutdown.
    >
    > Yes. The sys_swapoff() system call can take many minutes
    > of CPU time. It basically does:
    >
    > for (each page in swap device) {
    > for (each process) {
    > for (each page used by this process)
    > stuff

    Sure, and at shutdown time when swapoff is called, there is only 1
    process, init, which isn't swapped out anymore. So this should run like
    lightning.

    Repeat: something is horribly wrong with the VM's management of pages,
    lists, swap, cache, etc.

    -jwb

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