linux-kernel - Re: [PATCH] prctl: Add PR_SET_TIMERSLACK_PID for setting timer slack of an arbitrary thread.

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Message-ID: <CALAqxLUc0-TFOxV_-Co0t+Qmu8aE01rDkGfDTTepZfCCZMb70g@mail.gmail.com>
Date:	Fri, 5 Feb 2016 14:35:35 -0800
From:	John Stultz <john.stultz@...aro.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Kees Cook <keescook@...omium.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Ruchi Kandoi <kandoiruchi@...gle.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Oren Laadan <orenl@...lrox.com>,
	Rom Lemarchand <romlem@...roid.com>,
	Android Kernel Team <kernel-team@...roid.com>
Subject: Re: [PATCH] prctl: Add PR_SET_TIMERSLACK_PID for setting timer slack
 of an arbitrary thread.

On Fri, Feb 5, 2016 at 12:50 PM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> On Fri, 5 Feb 2016 12:44:04 -0800 Kees Cook <keescook@...omium.org> wrote:
>> Could this be exposed as a writable /proc entry instead? Like the oom_* stuff?
>
> /proc/<pid>/timer_slack_ns, guarded by ptrace_may_access(), documented
> under Documentation/?  Yup, that would work.  It's there for all
> architectures from day one and there is precedent.  It's not as nice,
> but /proc nasties will always be with us.

Ok. I'll start working on that.

Thanks for the feedback and ideas!
-john