From: Meng Xu <firstname.lastname@example.org> To: Dario Faggioli <email@example.com> Cc: "firstname.lastname@example.org" <email@example.com>, Dagaen Golomb <firstname.lastname@example.org>, George Dunlap <email@example.com>, Jan Beulich <JBeulich@suse.com>, Tianyang Chen <firstname.lastname@example.org> Subject: Re: [PATCH v11]xen: sched: convert RTDS from time to event driven model Date: Fri, 18 Mar 2016 10:23:08 -0400 [thread overview] Message-ID: <CAENZ-+ko9WwMp9s86pBg_YjFpFTkab-bHd=dPpRsuj56MPO1xQ@mail.gmail.com> (raw) In-Reply-To: <email@example.com> >> > I tried to create a cpupool and then migrate a VM to the new >> > cpupool; >> > BTW, Meng: > > (XEN) [<ffff82d08012e182>] schedule_cpu_switch+0x250/0x28a > (XEN) [<ffff82d080101b49>] cpupool.c#cpupool_assign_cpu_locked+0x31/0x11f > > I think you mean "and then move a CPU from a cpupool to another". Or > perhaps what you said is what your script does, and you weren't sure at > what stage it explodes. > > Well, let me tell you: it's when you move a CPU between pools that have > schedulers that remaps the scheduler locks (such as Credit2-->RTDS and > vice versa). Thanks Dario for the explanation! Yes, I looked into the cpu_switch things before and found the bug is triggered by the lock remapping. > >> > However, the system triggers the bug as below. I guess this is some >> > kind of bug that are known to us, and Dario had some uncommitted >> > patch to fix it, IIRC? >> In the context of this patch the most relevant question is: Is this >> an issue with the patch, or one that existed already before? >> > Exactly! > > And the answer is: > - it's pre-existing > - it's an even bigger issue than that ASSERT triggering (i.e., there > are potential races even when things works) Ah-ha, I didn't know this before. :-) > - I'm taking care of it. Thank you so much! I'm looking forward to it. :-D Thanks and Best Regards, Meng ----------- Meng Xu PhD Student in Computer and Information Science University of Pennsylvania http://www.cis.upenn.edu/~mengxu/ _______________________________________________ Xen-devel mailing list Xenfirstname.lastname@example.org http://lists.xen.org/xen-devel
next prev parent reply other threads:[~2016-03-18 14:23 UTC|newest] Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-03-17 16:06 Tianyang Chen 2016-03-17 18:27 ` Dario Faggioli 2016-03-17 20:12 ` Chen, Tianyang 2016-03-18 1:45 ` Meng Xu 2016-03-18 4:09 ` Meng Xu 2016-03-18 7:45 ` Jan Beulich 2016-03-18 9:23 ` Dario Faggioli 2016-03-18 14:23 ` Meng Xu [this message] 2016-03-18 14:19 ` Meng Xu 2016-03-18 9:24 ` Dario Faggioli 2016-03-18 14:25 ` Meng Xu
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