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Date: Wed, 01 Nov 2017 07:54:23 +0100 From: Mike Galbraith <efault@....de> To: Atish Patra <atish.patra@...cle.com>, Peter Zijlstra <peterz@...radead.org> Cc: linux-kernel@...r.kernel.org, joelaf@...gle.com, brendan.jackman@....com, jbacik@...com, mingo@...hat.com Subject: Re: [PATCH RFC 1/2] sched: Minimize the idle cpu selection race window. On Wed, 2017-11-01 at 01:08 -0500, Atish Patra wrote: > > On 10/31/2017 03:48 AM, Mike Galbraith wrote: > > > I played with something ~similar (cmpxchg() idle cpu reservation) > I had an atomic version earlier as well. Peter's suggestion for per cpu > seems to perform slightly better than atomic. Yeah, no doubt about that. > Thus, this patch has the per cpu version. > > a > > while back in the context of schbench, and it did help that, > Do you have the schbench configuration somewhere that I can test? I > tried various configurations but did not > see any improvement or regression. No, as noted, I didn't save anything. I watched and fiddled with several configurations on various sized boxen, doing this/that on top of the reservation thing to try to improve the "it's 100% about perfect spread" schbench, but didn't like the pricetag, so tossed the lot over my shoulder and walked away. -Mike
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