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    SubjectRe: 2.6.39-rc4+: Kernel leaking memory during FS scanning, regression?
    On Thu, Apr 28, 2011 at 8:28 AM, Sedat Dilek <sedat.dilek@googlemail.com> wrote:
    >
    > From the very beginning it looked as the system is "stable" due to:

    Actually, look here, right from the beginning that log is showing
    total breakage:

    Thu Apr 28 16:49:51 CEST 2011
    .rt_time : 233.923773
    Thu Apr 28 16:50:06 CEST 2011
    .rt_time : 259.446506
    Thu Apr 28 16:50:22 CEST 2011
    .rt_time : 273.110840
    Thu Apr 28 16:50:37 CEST 2011
    .rt_time : 282.713537
    Thu Apr 28 16:50:52 CEST 2011
    .rt_time : 288.136013
    Thu Apr 28 16:51:07 CEST 2011
    .rt_time : 293.057088
    ..
    Thu Apr 28 16:58:29 CEST 2011
    .rt_time : 888.893877
    Thu Apr 28 16:58:44 CEST 2011
    .rt_time : 950.005460

    iow, rt_time just constantly grows. You have that "sleep 15" between
    every log entry, so rt_time growing by 10-100 ms every 15 seconds
    obviously does mean that it's using real CPU time, but it's still well
    in the "much less than 1% CPU" range. So the rcu thread is clearly
    doing work, but equally clearly it should NOT be throttled.

    But since it is constantly growing, at some point it _will_ hit that
    magical "950ms total time used", and then it gets throttled. For no
    good reason.

    It shouldn't have been throttled in the first place, and then the
    other bug - that it isn't apparently ever unthrottled - just makes it
    not work at all.

    So that whole throttling is totally broken.

    Linus


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