Messages in this thread |  | | From | Paul Turner <> | Date | Wed, 13 Feb 2013 07:45:54 -0800 | Subject | Re: [patch v4 08/18] Revert "sched: Introduce temporary FAIR_GROUP_SCHED dependency for load-tracking" |
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On Wed, Feb 13, 2013 at 7:23 AM, Alex Shi <alex.shi@intel.com> wrote: > On 02/12/2013 06:27 PM, Peter Zijlstra wrote: >> On Thu, 2013-01-24 at 11:06 +0800, Alex Shi wrote: >>> Remove CONFIG_FAIR_GROUP_SCHED that covers the runnable info, then >>> we can use runnable load variables. >>> >> It would be nice if we could quantify the performance hit of doing so. >> Haven't yet looked at later patches to see if we remove anything to >> off-set this. >> > > In our rough testing, no much clear performance changes. >
I'd personally like this to go with a series that actually does something with it.
There's been a few proposals floating around on _how_ to do this; but the challenge is in getting it stable enough that all of the wake-up balancing does not totally perforate your stability gains into the noise. select_idle_sibling really is your nemesis here.
It's a small enough patch that it can go at the head of any such series (and indeed; it was originally structured to make such a patch rather explicit.)
> -- > Thanks > Alex
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