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Am 22.11.2013 17:06, schrieb Mark Knecht: |
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> On Fri, Nov 22, 2013 at 3:13 AM, Volker Armin Hemmann |
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> <volkerarmin@××××××××××.com> wrote: |
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>> Am 21.11.2013 20:52, schrieb Mark Knecht: |
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>>> Hi, |
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>>> I've been having a problem with new versions of Virtualbox hanging |
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>>> my system completely, but only if I use the CONFIG_PREEMPT option. |
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>>> I.e. - Preemptable Kernel (Low Latency Desktop) The problem does not |
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>>> occur if I select Voluntary Preemption. |
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>>> |
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>>> The Oracle guys who do Virtualbox development has asked me to try |
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>>> full preempt but disable the PREEMPT_RCU option as a test. I think |
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>>> possibly Paul McKenney works on the RCU stuff and also frequenct this |
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>>> list so possibly he or someone else here can tell me where I find the |
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>>> option to completely disable the RCU stuff. (If it exists...) |
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>>> |
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>>> I'm currently running gentoo-sources-3.10.19, trying to build 3.10.20. |
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>>> |
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>>> Specifically, here's where I am now: |
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>>> |
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>>> c2RAID6 linux # cat .config | grep PREEMPT |
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>>> CONFIG_TREE_PREEMPT_RCU=y |
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>>> CONFIG_PREEMPT_RCU=y |
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>>> CONFIG_PREEMPT_NOTIFIERS=y |
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>>> # CONFIG_PREEMPT_NONE is not set |
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>>> # CONFIG_PREEMPT_VOLUNTARY is not set |
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>>> CONFIG_PREEMPT=y |
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>>> CONFIG_PREEMPT_COUNT=y |
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>>> CONFIG_DEBUG_PREEMPT=y |
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>>> c2RAID6 linux # |
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>>> |
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>>> I found General Setup-> RCU Subsystem but I'm ot clear what option |
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>>> might allow me to do what I think the Oracle devs are asking me to do. |
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>>> |
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>>> If I need a newer/different kernel let me know. |
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>>> |
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>>> Thanks, |
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>>> Mark |
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>>> |
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>>> |
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>> make menuconfig |
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>> hit slash |
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>> type in RCU |
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>> |
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>> it will tell you where to find stuff |
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>> |
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>> |
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> And the only thing that I see that looks like a candidate says |
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> |
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> Symbol: PREEMPT_RCU [=y] |
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> │ |
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> │ Type : boolean |
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> │ |
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> │ Defined at init/Kconfig:472 |
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> |
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> which doesn't give me any option to change it in make menuconfig. |
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no, that means it is turned on by some other option. |
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|
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maybe you should use grep. |
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