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

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Message-ID: <20140306121333.GA12127@chicago.guarana.org>
Date:	Thu, 6 Mar 2014 23:13:33 +1100
From:	Kevin Easton <kevin@...rana.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Khalid Aziz <khalid.aziz@...cle.com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	peterz@...radead.org, akpm@...ux-foundation.org,
	viro@...iv.linux.org.uk, oleg@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] [PATCH] Pre-emption control for userspace

On Tue, Mar 04, 2014 at 04:51:15PM -0800, Andi Kleen wrote:
> Anything else?

If it was possible to make the time remaining in the current timeslice
available to userspace through the vdso, the thread could do something like:

if (sys_timeleft() < CRITICAL_SECTION_SIZE)
    yield();
lock();

to avoid running out of timeslice in the middle of the critical section.

    - Kevin
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