linux-kernel - Re: Thread Scheduler

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Message-ID: <20140324203032.GA16964@rhlx01.hs-esslingen.de>
Date:	Mon, 24 Mar 2014 21:30:32 +0100
From:	Andreas Mohr <andi@...as.de>
To:	Mahmood Naderan <nt_mahmood@...oo.com>
Cc:	Mike Galbraith <umgwanakikbuti@...il.com>,
	Jack Carrozzo <jack@...pinc.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Thread Scheduler

Hi,

> OK I read them and it seems that in order to change the scheduler, I have to write a C code and call the sched_set* functions. Please correct that if I am wrong.
> 
> So in order to use my custom scheduler, I have to do the following steps.
> 
> 1- Write my  code using the APIs and save that in kernel/sched_custom.c
> 2- Invoke sched_custom.c in kernel/sched.c
> 3- Recompile the kernel source
> 4- Reboot using the new kernel
> 5- write a C code and call sched_setschedule() to use my scheduler.
> 
> Is that all? Your reply is appreciated.

No, AFAIK these are *user-space* APIs, thus they're supposed to be used by
applications (correct me if I'm wrong).

So the question would be what exactly you're trying to achieve:
either you want to actively modify the kernel-side scheduler sources,
in which case these APIs probably are not what you want (to use there),
or you're trying to modify scheduling configuration of user-space applications,
in which case they possibly are.
Or you want both, in which case you probably
modify kernel scheduler implementation *and* use sched_*() in user-space
with the intent to ensure that that modified scheduler implementation
gets chosen.

HTH,

Andreas Mohr
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