Messages in this thread Patch in this message | | | Date | Tue, 27 May 2008 11:58:30 +0300 | From | Adrian Bunk <> | Subject | [RFC: 2.6 patch] let GROUP_SCHED depend on BROKEN |
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I know that this is controversial, for further background please see the discussion in http://bugzilla.kernel.org/show_bug.cgi?id=10761
Facts: - Bugzilla statistics (not counting duplicate bugs and bugs closed as INVALID): - 6 CPU scheduler regressions reported during 2.6.25-rc 1 of them still open as of 2.6.26-rc4 - 6 CPU scheduler regressions reported during 2.6.26-rc until now 5 of them still open as of 2.6.26-rc4 - at about half of the CPU scheduler regressions are related to group scheduling - Peter Zijlstra said in Bugzilla bug #10761: > Adrian Bunk said: > The CPU scheduler is currently regressing horribly often, and half of the > regressions are in group scheduling. That is because group scheduling is horribly complex and was never feature complete - trying to solve that is high on my list of priorities.
My opinion: - features that alter existing kernel functionality should (different from drivers for previously not supported hardware) be in a very good state before being offered in stable kernels - Peter is wrong when he thinks that EXPERIMENTAL would somehow hide known-problematic features - in practice nearly everyone has to have EXPERIMENTAL enabled (e.g. for some hardware driver) - group scheduling already has a history of people accidentally enabling it and then running into problems
I therefore suggest this patch to let GROUP_SCHED depend on BROKEN.
Once it is feature complete and then got the usual testing through -next I'll have no objections against offering it again to users.
Signed-off-by: Adrian Bunk <bunk@kernel.org>
--- c67cfbbb40895b72760865527dd1949631b1d183 diff --git a/init/Kconfig b/init/Kconfig index d9526b5..564deba 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -333,7 +333,7 @@ config HAVE_UNSTABLE_SCHED_CLOCK config GROUP_SCHED bool "Group CPU scheduler" - depends on EXPERIMENTAL + depends on BROKEN default n help This feature lets CPU scheduler recognize task groups and control CPU
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