Messages in this thread | | | Date | Thu, 8 Dec 2005 07:30:09 +0100 | From | Andi Kleen <> | Subject | Re: for_each_online_cpu broken ? |
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On Thu, Dec 08, 2005 at 01:28:44AM -0500, Dave Jones wrote: > On Thu, Dec 08, 2005 at 04:22:05PM +1000, Nigel Cunningham wrote: > > > > Yep, I noticed it offers a maximum of 6 cpus on my way. > > > As a sidenote, seems kinda funny (and wasteful maybe?), doing this > > > on a lot of hardware that isn't hotplug capable. (Whilst I could > > > disable cpu hotplug in my local build, this isn't an answer for > > > a generic distro kernel). > > > > Both suspend to disk (and suspend to ram?) implementations now depend on > > hotplug_cpu to enable extra cpus, so there is at least one reason for > > them to want hotplug support in a generic kernel. > > You mean suspend -> plug in a new cpu -> resume transitions ? > That sounds *terrifying*.
No, they unplug all non BP CPUs before suspending. It obviously doesn't require additional CPUs though.
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