linux-kernel - Re: Re: [RFC/RFT PATCH] sched: automated per tty task groups

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Date:	Fri, 22 Oct 2010 00:13:49 +0200
From:	Marco <mpiazza@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Mike Galbraith <efault@....de>
Subject: Re: Re: [RFC/RFT PATCH] sched: automated per tty task groups

I've made some tests to give a try to tty grouping patches.

Kernel 2.6.36+CONFIG_SCHED_AUTOGROUP+Improve_tick_preemption.patch

These are the result of :
taskset -c 0 ./wakeup-latency& sleep 30;killall wakeup-latency (owner marco)
vs
taskset -c 0 make -j 10 bzImage


Vanilla 2.6.36
maximum latency: 52879.7 µs
average latency: 4217.5 µs
missed timer events: 0

Kernel 2.6.36+autogroup enabled
maximum latency: 2840.8 µs
average latency: 15.5 µs
missed timer events: 0

Kernel 2.6.36+libpam-systemd enabled
maximum latency: 26361.6 µs
average latency: 4548.6 µs
missed timer events: 0

Kernel 2.6.36+START-NICE sched feature(v3)
maximum latency: 76182.8 µs
average latency: 4930.1 µs
missed timer events: 0

Quite impressive.....
Now, i can play supertuxkart while make'ing -j 10 and stellarium shows
the highest fps i've seen so far.
Very good job, guys.

Marco


On Thu, Oct 21, 2010 at 11:17 AM, Marco <mpiazza@...il.com> wrote:
> Hello, i'm a little confused about tty grouping.
> The benefit in terms of latency is only due to the grouping of task
> under the appropriate cgroup hierarchy?
>
> Can this issue be solved by userspace daemon (think of libpam-systemd,
> libpam-cgroup)? Perhaps tty grouping in kernel space is more
> efficient.
>
> I'm missing something?
>
> Marco
>
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