Messages in this thread | | | Date | Sat, 04 Apr 2015 10:10:01 -0400 | From | Rik van Riel <> | Subject | Re: [PATCH 2/2] nohz: make nohz_full imply isolcpus |
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On 04/03/2015 03:20 PM, Chris Metcalf wrote: > On 04/03/2015 01:42 PM, Frederic Weisbecker wrote: >> On Fri, Apr 03, 2015 at 12:24:08PM -0400, cmetcalf@ezchip.com wrote: >>> From: Chris Metcalf <cmetcalf@ezchip.com> >>> >>> It's not clear that nohz_full is useful without isolcpus also >>> set, since otherwise the scheduler has to run periodically to >>> try to determine whether to steal work from other cores. >>> >>> Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com> >> I think Rick has a similar patch. > > I didn't see anything relevant in linux-next, though I did see > cpu_isolated_map > made into a public symbol in a recent commit by Rik.
I have a few patches in cgroups/for-4.1 as well that export information about isolated and nohz_full cpus in /sys/devices/system/cpu/
> Rik, what's the change you're proposing that's similar to this one? Thanks!
I don't have this particular one, and I like it.
I know there are use cases where isolcpus= without nohz_full= makes sense, but I cannot think of the reverse.
Acked-by: Rik van Riel <riel@redhat.com>
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