linux-kernel - Re: [RFC] [PATCH] Pre-emption control for userspace

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Message-ID: <53175A73.2070204@oracle.com>
Date:	Wed, 05 Mar 2014 10:10:11 -0700
From:	Khalid Aziz <khalid.aziz@...cle.com>
To:	Oleg Nesterov <oleg@...hat.com>
CC:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	peterz@...radead.org, akpm@...ux-foundation.org,
	andi.kleen@...el.com, rob@...dley.net, viro@...iv.linux.org.uk,
	venki@...gle.com, linux-kernel@...r.kernel.org
Subject: Re: [RFC] [PATCH] Pre-emption control for userspace

On 03/05/2014 09:12 AM, Oleg Nesterov wrote:
> On 03/05, Oleg Nesterov wrote:
>>
>> You added /proc/sched_preempt_delay to avoid the syscall. I think it
>> would be better to simply add vdso_sched_preempt_delay() instead.
>
> I am stupid. vdso_sched_preempt_delay() obviously can't write to, say,
> task_struct.
>
> Oleg.
>

That is easy to miss :) I had looked into vdso when I started but found 
out I can't use vdso for this.

--
Khalid
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