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    SubjectRe: 2.6.39-rc4+: Kernel leaking memory during FS scanning, regression?
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    On Thu, 2011-04-28 at 03:26 -0700, Paul E. McKenney wrote:
    > On Thu, Apr 28, 2011 at 11:45:03AM +0200, Sedat Dilek wrote:
    > > Hi,
    > >
    > > not sure if my problem from linux-2.6-rcu.git#sedat.2011.04.23a is
    > > related to the issue here.
    > >
    > > Just FYI:
    > > I am here on a Pentium-M (uniprocessor aka UP) and still unsure if I
    > > have the correct (optimal?) kernel-configs set.
    > >
    > > Paul gave me a script to collect RCU data and I enhanced it with
    > > collecting SCHED data.
    > >
    > > In the above mentionned GIT branch I applied these two extra commits
    > > (0001 requested by Paul and 0002 proposed by Thomas):
    > >
    > > patches/0001-Revert-rcu-restrict-TREE_RCU-to-SMP-builds-with-PREE.patch
    > > patches/0002-sched-Add-warning-when-RT-throttling-is-activated.patch
    > >
    > > Furthermore, I have added my kernel-config file, scripts, patches and
    > > logs (also output of 'cat /proc/cpuinfo').
    > >
    > > Hope this helps the experts to narrow down the problem.
    >
    > Yow!!!
    >
    > Now this one might well be able to hit the 950 millisecond limit.
    > There are no fewer than 1,314,958 RCU callbacks queued up at the end of
    > the test. And RCU has indeed noticed this and cranked up the number
    > of callbacks to be handled by each invocation of rcu_do_batch() to
    > 2,147,483,647. And only 15 seconds earlier, there were zero callbacks
    > queued and the rcu_do_batch() limit was at the default of 10 callbacks
    > per invocation.

    Yeah, yow. Once the RT throttle hit, it stuck.

    .clock : 1386824.201768
    .rt_nr_running : 2
    .rt_throttled : 1
    .rt_time : 950.132427
    .rt_runtime : 950.000000
    rcuc0 7 0.034118 10857 98 0.034118 1472.309646 0.000000 /
    FF 1 1 R R 0 [rcuc0]
    .clock : 1402450.997994
    .rt_nr_running : 2
    .rt_throttled : 1
    .rt_time : 950.132427
    .rt_runtime : 950.000000
    rcuc0 7 0.034118 10857 98 0.034118 1472.309646 0.000000 /
    FF 1 1 R R 0 [rcuc0]

    ...

    .clock : 2707432.862374
    .rt_nr_running : 2
    .rt_throttled : 1
    .rt_time : 950.132427
    .rt_runtime : 950.000000
    rcuc0 7 0.034118 10857 98 0.034118 1472.309646 0.000000 /
    FF 1 1 R R 0 [rcuc0]
    .clock : 2722572.958381
    .rt_nr_running : 2
    .rt_throttled : 1
    .rt_time : 950.132427
    .rt_runtime : 950.000000
    rcuc0 7 0.034118 10857 98 0.034118 1472.309646 0.000000 /
    FF 1 1 R R 0 [rcuc0]




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