On 13-04-02 08:45 AM, Dietmar Eggemann wrote: > On 26/03/13 18:34, Mathieu Poirier wrote: >> On 13-03-26 12:31 PM, Mathieu Poirier wrote: >>> On 13-03-26 11:27 AM, Viresh Kumar wrote: >>>> On 26 March 2013 22:52, Dietmar Eggemann <dietmar.eggem...@arm.com> >>>> wrote: >>>>> Would it be possible for you to merge in 'idlenocb.2013.03.18b' (based >>>>> on v3.9-rc2) (or newer) from >>>>> 'git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git' >>>>> into your big.LITTLE MP tree? I talked to Paul McKenney about this and >>>>> he would like to have this additional test coverage. >>>> >>>> 13.03 release is already over and this would be available after that. >>>> >>>>> (2) On top of the merge, we must assure that the TC2 default config >>>>> file >>>>> gets changed: >>>>> >>>>> >>>>> Change the config file: >>>>> * Set CONFIG_RCU_FAST_NO_HZ=y >>>>> * Set CONFIG_RCU_NOCB_CPU=y >>>>> * Set CONFIG_RCU_NOCB_CPU_ALL=y >>>> >>>> @Mathieu/Nicolas: you see any issues with these? I know we have been >>>> working on some issues with/without them for some time. >>>> >>> >>> The CONFIG_RCU_FAST_NO_HZ option is known to increase the likely hood >>> of hitting a tight race condition in the cpu hotplug and smpboot thread >>> area. The condition doesn't disappear when the option is off but it >>> decreases the failure rate. >>> >>> Mathieu. > > Hi Mathieu, > > I ran an MP configuration based on the latest ll-20130325.0 branch from > Linaro plus linux_paulmck_rcu/idlenocb.2013.03.26b with the RCU kernel > configuration mentioned above. > > I used pm-qa cpuhotplug_08.sh test against this system > > # for i in $(seq 1000); do ./cpuhotplug_08.sh; done > > and haven't encountered any issues. BTW, I'm not doing any IKS related > tests. > > -- Dietmar
Good morning, That is very interesting information - I'll try this on my side and will get back to you. Thanks, Mathieu. > >>> >> >> What we could do is take it in 'next' and see how it behaves. After all >> the worst that can happen is to still observe the issue... >> > > > > -- IMPORTANT NOTICE: The contents of this email and any attachments are > confidential and may also be privileged. If you are not the intended > recipient, please notify the sender immediately and do not disclose the > contents to any other person, use it for any purpose, or store or copy > the information in any medium. Thank you. > _______________________________________________ linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev
