linux-kernel - Re: [PATCH 3/4] sched: Add bandwidth ratio to /proc/sched

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Message-ID: <20160223095542.GH27380@e106622-lin>
Date:	Tue, 23 Feb 2016 09:55:42 +0000
From:	Juri Lelli <juri.lelli@....com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Juri Lelli <juri.lelli@...il.com>,
	Clark Williams <williams@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 3/4] sched: Add bandwidth ratio to /proc/sched_debug

Hi Steve,

On 22/02/16 16:26, Steven Rostedt wrote:
> From: "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>
> 
> Playing with SCHED_DEADLINE and cpusets, I found that I was unable to create
> new SCHED_DEADLINE tasks, with the error of EBUSY as if the bandwidth was
> already used up. I then realized there wa no way to see what bandwidth is
> used by the runqueues to debug the issue.
> 
> By adding the dl_bw->bw and dl_bw->total_bw to the output of the deadline
> info in /proc/sched_debug, this allows us to see what bandwidth has been
> reserved and where a problem may exist.
> 

[...]

> 
> Signed-off-by: Steven Rostedt <rostedt@...dmis.org>

This is pretty useful yes.

FWIW,
Acked-by: Juri Lelli <juri.lelli@....com>

Best,

- Juri