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Date: Sat, 21 Oct 2006 20:51:08 +1000 From: Nick Piggin <nickpiggin@...oo.com.au> To: Paul Jackson <pj@....com> CC: akpm@...l.org, mbligh@...gle.com, menage@...gle.com, Simon.Derr@...l.net, linux-kernel@...r.kernel.org, dino@...ibm.com, rohitseth@...gle.com, holt@....com, dipankar@...ibm.com, suresh.b.siddha@...el.com, clameter@....com Subject: Re: [RFC] cpuset: add interface to isolated cpus Paul Jackson wrote: >>If you always have other domains overlapping them (regardless >>that it is a parent), then what actual use does cpu_exclusive >>flag have? > > > Good question. To be a tad too honest, I don't consider it to be > all that essential. > > It does turn out to be a bit useful, in that you can be confident that > if you are administering the batch scheduler and it has a cpu_exclusive > cpuset covering a big chunk of your system, then no other cpuset other > than the top cpuset right above, which you administer pretty tightly, > could have anything overlapping it. You don't have to actually look > at the cpumasks in all the parallel cpusets and cross check each one > against the batch schedulers set of cpus for overlap. > > But as you can see by grep'ing in kernel/cpuset.c, it is only used > to generate a couple of error returns, for things that you can do > just fine by turning off the cpu_exclusive flag. Well, it was supposed to be used for sched-domains partitioning, and its uselessness for anything else I guess is what threw me. But even the way cpu_exclusive semantics are defined makes it not quite compatible with partitioning anyway, unfortunately. -- SUSE Labs, Novell Inc. Send instant messages to your online friends http://au.messenger.yahoo.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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