From: Peter Zijlstra <peterz@infradead.org>
To: byungchul.park@lge.com
Cc: mingo@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] sched: ensure a task has a non-normalized vruntime when returning back to cfs
Date: Mon, 10 Aug 2015 14:14:07 +0200 [thread overview]
Message-ID: <20150810121407.GB16853@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <1439197375-27927-1-git-send-email-byungchul.park@lge.com>
On Mon, Aug 10, 2015 at 06:02:55PM +0900, byungchul.park@lge.com wrote:
> From: Byungchul Park <byungchul.park@lge.com>
>
> current code ensures a task has a normalized vruntime when switching off
> from fair class, but it does not ensure the task has a non-normalized
> vruntime when switching back to the fair class.
>
> this is an example breaking this consistency.
>
> 1. a task is in fair class and !queue
> 2. change its class to rt class (still !queue)
> 3. change its class to fair class again (stll !queue)
Just curious, did you manage to trigger this in practise or did you find
it through code inspection only?
next prev parent reply other threads:[~2015-08-10 12:14 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-10 9:02 byungchul.park
2015-08-10 12:14 ` Peter Zijlstra [this message]
2015-08-10 23:35 ` Byungchul Park
2015-08-11 0:06 ` Byungchul Park
2015-08-12 12:37 ` [tip:sched/core] sched: Ensure a task has a non-normalized vruntime when returning back to CFS tip-bot for Byungchul Park
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