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    SubjectRe: [patch][rfc] quell interactive feeding frenzy
    Date
    Con Kolivas wrote:
    > On Friday 14 April 2006 13:16, Al Boldi wrote:
    > > Can you try the attached mem-eater passing it the number of kb to be
    > > eaten.
    > >
    > > i.e. '# while :; do ./eatm 9999 ; done'
    > >
    > > This will print the number of bytes eaten and the timing in ms.
    > >
    > > Assuming timeslice=100, adjust the number of kb to be eaten such that
    > > the timing will be less than timeslice (something like 60ms). Switch to
    > > another vt and start another eatm w/ the number of kb yielding more than
    > > timeslice (something like 140ms). This eatm should starve completely
    > > after exceeding timeslice.
    > >
    > > This problem also exists in mainline, but it is able to break out of it
    > > to some extent. Setting eatm kb to a timing larger than timeslice does
    > > not exhibit this problem.
    >
    > Thanks for bringing this to my attention. A while back I had different
    > management of forked tasks and merged it with PF_NONSLEEP. Since then I've
    > changed the management of NONSLEEP tasks and didn't realise it had
    > adversely affected the accounting of forking tasks. This patch should
    > rectify it.

    Congrats!

    Much smoother, but I still get this choke w/ 2 eatm 9999 loops running:

    9 MB 783 KB eaten in 131 msec (74 MB/s)
    9 MB 783 KB eaten in 129 msec (75 MB/s)
    9 MB 783 KB eaten in 129 msec (75 MB/s)
    9 MB 783 KB eaten in 131 msec (74 MB/s)
    9 MB 783 KB eaten in 133 msec (73 MB/s)
    9 MB 783 KB eaten in 132 msec (73 MB/s)
    9 MB 783 KB eaten in 128 msec (76 MB/s)
    9 MB 783 KB eaten in 133 msec (73 MB/s)
    9 MB 783 KB eaten in 129 msec (75 MB/s)
    9 MB 783 KB eaten in 130 msec (74 MB/s)
    9 MB 783 KB eaten in 2416 msec (3 MB/s) <<<<<<<<<<<<<
    9 MB 783 KB eaten in 197 msec (48 MB/s)
    9 MB 783 KB eaten in 133 msec (73 MB/s)
    9 MB 783 KB eaten in 132 msec (73 MB/s)
    9 MB 783 KB eaten in 132 msec (73 MB/s)
    9 MB 783 KB eaten in 126 msec (77 MB/s)
    9 MB 783 KB eaten in 135 msec (72 MB/s)
    9 MB 783 KB eaten in 132 msec (73 MB/s)
    9 MB 783 KB eaten in 132 msec (73 MB/s)
    9 MB 783 KB eaten in 134 msec (72 MB/s)
    9 MB 783 KB eaten in 64 msec (152 MB/s)
    9 MB 783 KB eaten in 63 msec (154 MB/s)
    9 MB 783 KB eaten in 63 msec (154 MB/s)
    9 MB 783 KB eaten in 63 msec (154 MB/s)
    9 MB 783 KB eaten in 63 msec (154 MB/s)
    9 MB 783 KB eaten in 64 msec (152 MB/s)
    9 MB 783 KB eaten in 63 msec (154 MB/s)
    9 MB 783 KB eaten in 64 msec (152 MB/s)
    9 MB 783 KB eaten in 63 msec (154 MB/s)
    9 MB 783 KB eaten in 63 msec (154 MB/s)
    9 MB 783 KB eaten in 63 msec (154 MB/s)
    9 MB 783 KB eaten in 63 msec (154 MB/s)
    9 MB 783 KB eaten in 63 msec (154 MB/s)

    You may have to adjust the kb to get the same effect.

    Thanks!

    --
    Al

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