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