Messages in this thread | | | Date | Mon, 13 Nov 2017 16:13:28 +0100 | From | Ingo Molnar <> | Subject | Re: [GIT PULL] scheduler updates for v4.15 |
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* Mike Galbraith <efault@gmx.de> wrote:
> On Mon, 2017-11-13 at 09:00 +0100, Ingo Molnar wrote: > > > > - Improve the RT IPI based balancing logic (Steven Rostedt) > > Well how 'bout that, serendipity strikes again: > > I just got a report that a proggy Gregory Haskins wrote back in 2007 > (preempt-test) was claiming RT was broken, but no, it's every kernel > containing b6366f048e0c. What the proggy does is to start a gaggle of > RT tasks of descending priority, giving each an identical quantum of > work to do, expecting higher priority tasks to get it done before > lower. That currently does not always happen, we occasionally do not > get a task pushed for long enough that a task that should have been > preempted by a push shortly after hitting the CPU, manages to remain > long enough to finish well before it should have been able to. > > This patch fixed it up before I could even get my troubleshooting > wheels properly smoking (they spin a bit before getting traction). > Given that, not to mention b6366f048e0c being capable of log jamming > even fairly modest boxen, perhaps this patch wants a stable tag?
Ok, agreed - I've forwarded 4bdced5c9a29 to Greg for -stable inclusion.
Thanks,
Ingo
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