On Tue, May 24, 2016 at 7:59 AM, Renato Utsch [off-list ref] wrote:

The idea is to patch the kernel. I am trying to discover how I can set the
default scheduler for new processes, so that I can test the behavior of any
schedulers that I may write. Do you have any ideas?

Em Seg, 23 de mai de 2016 10:05 AM, Mulyadi Santosa <
mulyadi.santosa at gmail.com> escreveu:

quoted

On Fri, May 20, 2016 at 6:51 AM, Renato Utsch [off-list ref]
wrote:

quoted

Hello,

I am a new developer trying to learn how to tinker with the kernel. I
searched on the internet but couldn't find much info about this (and
couldn't find any info up to date).

My question is, how does the kernel decide which is the default
scheduler that all processes start with? I can change the scheduler of a
process by sched_setscheduler(), but how do I change *all* processes from
using the CFS scheduler to, for example, the RR scheduler?

Sorry if this is too basic, but I don't know where to search for this.
If you guys could point me places where I can learn more about this, I
would be grateful.

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Hi..

putting aside scheduler plugins module that once exist and maintained
(not sure now), I guess the only way to switch to new scheduler is to patch
your kernel first (if you haven't do that) with scheduler patch such as Con
Kolivas BFS and reboot to that new kernel.


--
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com

Hi...

Probably you need to provide several kernel image, each contains different
scheduler algorithm you want to test.

So in other word, IMHO, the only way to test different scheduler algorithm
is to boot to different kernel each time.

CMIIW


-- 
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com
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