Messages in this thread | | | Subject | Re: [PATCH 0/10] bulk cpu removal support | From | Shaohua Li <> | Date | Mon, 08 May 2006 15:39:19 +0800 |
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On Mon, 2006-05-08 at 01:29 -0500, Nathan Lynch wrote: > Shaohua Li wrote: > > CPU hotremove will migrate tasks and redirect interrupts off dead cpu. > > To remove multiple CPUs, we should iteratively do single cpu removal. > > If tasks and interrupts are migrated to a cpu which will be soon > > removed, then we will trash tasks and interrupts again. The following > > patches allow remove several cpus one time. It's fast and avoids > > unnecessary repeated trash tasks and interrupts. This will help NUMA > > style hardware removal and SMP suspend/resume. Comments and suggestions > > are appreciated. > > Some quantification of the benefits of adding this complexity would be > appreciated. Like, how long does it take to offline all the cpus in a > node serially, and how much faster is the bulk method? This depends on the workload and I haven't a data at hand, sorry. Fast (less tasks/timers/softirqs migration) is one benefit. The method also means less time in stop_machine_run and less interrupt redirection, so smaller impact to the whole system.
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