linux-kernel - Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy

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Message-ID: <20151025104145.GE27558@thunk.org>
Date:	Sun, 25 Oct 2015 06:41:45 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Paul Turner <pjt@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Li Zefan <lizefan@...wei.com>,
	cgroups <cgroups@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	kernel-team <kernel-team@...com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 3/3] sched: Implement interface for cgroup unified
 hierarchy

On Sun, Oct 25, 2015 at 10:33:32AM +0100, Ingo Molnar wrote:
> 
> Hm, that's weird - all our sched_*() system call APIs that set task scheduling 
> priorities are fundamentally per thread, not per process. Same goes for the old 
> sys_nice() interface. The scheduler has no real notion of 'process', and certainly 
> not at the system call level.
>

I suspect the main issue is that the games programmers were trying to
access it via libc / pthreads, which hides a lot of the power
available at the raw syscall level.  This is probably more of a
"tutorial needed for userspace programmers" issue, at a guess.

	  	     	       		    	   - Ted
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