From: Peter Zijlstra <peterz@infradead.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
LKML <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Ingo Molnar <mingo@elte.hu>, Steven Rostedt <rostedt@goodmis.org>,
Thomas Gleixner <tglx@linutronix.de>,
Tony Lindgren <tony@atomide.com>, Mike Galbraith <efault@gmx.de>
Subject: Re: [RFC patch 1/2] sched: dynamically adapt granularity with nr_running
Date: Sun, 12 Sep 2010 11:14:27 +0200 [thread overview]
Message-ID: <1284282867.2251.84.camel@laptop> (raw)
In-Reply-To: <1284282392.2251.81.camel@laptop>
On Sun, 2010-09-12 at 11:06 +0200, Peter Zijlstra wrote:
> * is slice length, + is period length
>
> Patch (sched_latency = 10, sched_min_gran = 10/3)
>
>
> 30 | +
> |
> |
> | +
> |
> |
> |
> |
> |
> |
> 20 |
> |
> |
> |
> |
> |
> |
> |
> |
> |
> 10 | * + + + + + + +
> |
> |
> |
> |
> | *
> |
> | * * * * * * * *
> | * *
> | * *
> 0 +---------------------------------------------------------
> 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Vertical is time , horz is nr_running.
Note how things fall of a cliff when nr_running goes from 8 to 9. Andrew
usually kicks people in the teeth for phase change behaviour.
next prev parent reply other threads:[~2010-09-12 9:14 UTC|newest]
Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-11 17:37 [RFC patch 0/2] sched: dynamically adapt granularity with nr_running Mathieu Desnoyers
2010-09-11 17:37 ` [RFC patch 1/2] " Mathieu Desnoyers
2010-09-11 18:57 ` Peter Zijlstra
2010-09-11 19:21 ` Linus Torvalds
2010-09-11 20:36 ` Peter Zijlstra
2010-09-11 20:45 ` Peter Zijlstra
2010-09-11 20:52 ` Linus Torvalds
2010-09-12 9:07 ` Peter Zijlstra
2010-09-11 20:48 ` Linus Torvalds
2010-09-12 9:06 ` Peter Zijlstra
2010-09-12 9:14 ` Peter Zijlstra [this message]
2010-09-12 20:39 ` Mathieu Desnoyers
2010-09-13 12:54 ` Peter Zijlstra
2010-09-12 20:34 ` Mathieu Desnoyers
2010-09-13 12:53 ` Peter Zijlstra
2010-09-13 4:35 ` Mike Galbraith
2010-09-13 8:41 ` Peter Zijlstra
2010-09-13 11:22 ` Ingo Molnar
2010-09-13 13:52 ` Steven Rostedt
2010-09-13 13:54 ` Peter Zijlstra
2010-09-13 14:02 ` Peter Zijlstra
2010-09-13 14:21 ` Ingo Molnar
2010-09-11 20:52 ` Mathieu Desnoyers
2010-09-11 19:57 ` Mathieu Desnoyers
2010-09-12 10:41 ` Peter Zijlstra
2010-09-12 20:37 ` Mathieu Desnoyers
2010-09-13 12:53 ` Peter Zijlstra
2010-09-13 13:15 ` Peter Zijlstra
2010-09-13 13:56 ` Mathieu Desnoyers
2010-09-13 14:16 ` Peter Zijlstra
2010-09-13 14:43 ` Steven Rostedt
2010-09-13 15:25 ` Mathieu Desnoyers
2010-09-13 15:39 ` Steven Rostedt
2010-09-13 16:16 ` [RFC PATCH] check_preempt_tick should not compare vruntime with wall time Mathieu Desnoyers
2010-09-13 16:36 ` Linus Torvalds
2010-09-13 17:45 ` Mathieu Desnoyers
2010-09-13 17:51 ` Linus Torvalds
2010-09-13 18:01 ` Mathieu Desnoyers
2010-09-13 18:10 ` Steven Rostedt
2010-09-13 18:03 ` Ingo Molnar
2010-09-13 18:19 ` Mathieu Desnoyers
2010-09-13 18:23 ` [PATCH] sched: Improve latencies under load by decreasing minimum scheduling granularity Ingo Molnar
2010-09-13 18:28 ` Joe Perches
2010-09-13 19:44 ` Linus Torvalds
2010-09-13 20:00 ` Ingo Molnar
2010-09-13 18:19 ` [RFC PATCH] check_preempt_tick should not compare vruntime with wall time Ingo Molnar
2010-09-13 17:36 ` Ingo Molnar
2010-09-13 17:56 ` Mathieu Desnoyers
2010-09-14 2:10 ` Mike Galbraith
2010-09-13 14:44 ` [RFC patch 1/2] sched: dynamically adapt granularity with nr_running Mike Galbraith
[not found] ` <1284386179.10436.6.camel@marge.simson.net>
2010-09-13 15:53 ` Peter Zijlstra
2010-09-13 18:04 ` [RFC][PATCH] sched: Improve tick preemption Peter Zijlstra
2010-09-14 2:27 ` [RFC patch 1/2] sched: dynamically adapt granularity with nr_running Mike Galbraith
2010-09-12 6:14 ` Ingo Molnar
2010-09-12 7:21 ` Mike Galbraith
2010-09-12 18:16 ` Mathieu Desnoyers
2010-09-13 4:13 ` Mike Galbraith
2010-09-13 6:41 ` Ingo Molnar
2010-09-13 7:08 ` Mike Galbraith
2010-09-13 7:35 ` Mike Galbraith
2010-09-13 8:35 ` Peter Zijlstra
2010-09-13 9:16 ` Mike Galbraith
2010-09-13 9:37 ` Peter Zijlstra
2010-09-13 9:50 ` Mike Galbraith
2010-09-13 9:55 ` Peter Zijlstra
2010-09-13 10:06 ` Mike Galbraith
2010-09-13 10:45 ` Peter Zijlstra
2010-09-13 11:43 ` Peter Zijlstra
2010-09-13 11:49 ` Peter Zijlstra
2010-09-13 12:32 ` Mike Galbraith
2010-09-13 20:19 ` Mathieu Desnoyers
2010-09-13 20:56 ` Mathieu Desnoyers
2010-09-12 18:13 ` Mathieu Desnoyers
2010-09-12 23:44 ` Mathieu Desnoyers
2010-09-11 17:37 ` [RFC patch 2/2] sched: sleepers coarse granularity on wakeup Mathieu Desnoyers
2010-09-12 12:44 ` [RFC patch 0/2] sched: dynamically adapt granularity with nr_running Peter Zijlstra
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