Re: [PATCH] sched/fair: Do not decay new task load on first enqueue
From: Matt Fleming
Date: Tue Oct 11 2016 - 06:28:08 EST
On Mon, 10 Oct, at 06:09:14PM, Wanpeng Li wrote:
> 2016-10-10 18:01 GMT+08:00 Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>:
> > On Sun, 09 Oct, at 11:39:27AM, Wanpeng Li wrote:
> >> The difference between this patch and Peterz's is your patch have a
> >> delta since activate_task()->enqueue_task() does do update_rq_clock(),
> >> so why don't have the delta will cause low cpu machines (4 or 8) to
> >> regress against your another reply in this thread?
> > Both my patch and Peter's patch cause issues with low cpu machines. In
> > <20161004201105.GP16071@xxxxxxxxxxxxxxxxxxx> I said,
> > "This patch causes some low cpu machines (4 or 8) to regress. It turns
> > out they regress with my patch too."
> > Have I misunderstood your question?
> I compare this one https://marc.info/?l=linux-kernel&m=147446511924571
> with Peterz's patch.
Oh. Low cpu machines probably do regress with my patch. At least, I
can't find the notes to prove that they don't.