Messages in this thread | | | Date | Tue, 7 Feb 2017 09:46:13 +0000 | From | Mel Gorman <> | Subject | Re: mm: deadlock between get_online_cpus/pcpu_alloc |
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On Tue, Feb 07, 2017 at 10:23:31AM +0100, Vlastimil Babka wrote: > > > cpu offlining. I have to check the code but my impression was that WQ > > code will ignore the cpu requested by the work item when the cpu is > > going offline. If the offline happens while the worker function already > > executes then it has to wait as we run with preemption disabled so we > > should be safe here. Or am I missing something obvious? > > Tejun suggested an alternative solution to avoiding get_online_cpus() in > this thread: > https://lkml.kernel.org/r/<20170123170329.GA7820@htj.duckdns.org>
I was hoping it would not really be necessary to sync against the cpu offline callback if we know we don't really have to guarantee we run on the correct CPU.
-- Mel Gorman SUSE Labs
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