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Subject[patch] CFS scheduler, v4

i'm pleased to announce release -v4 of the CFS patchset. The patch
against v2.6.21-rc7 can be downloaded from:

http://redhat.com/~mingo/cfs-scheduler/

this CFS release too is mainly about fixing regressions and improving
interactivity, so the rate of change is relatively low:

11 files changed, 136 insertions(+), 72 deletions(-)

in particular the preemption fix could resolve the 'desktop slows down
under IO load' reports and the 'firefox does not switch tabs fast
enough' reports as well. The suspend2 crash and the yield related
Kaffeine hangs should be resolved as well.

Changes since -v3:

- usability fix: automatic renicing of kernel threads such as keventd,
OOM tasks and tasks doing privileged hardware access (such as Xorg).
(This is a substitute for group scheduling until the group scheduling
details have been worked out.)

- bugfix: buggy yield() caused suspend2 problems

- preemption fix: it caused desktop app latencies

As usual, any sort of feedback, bugreport, fix and suggestion is more
than welcome,

Ingo
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