linux-kernel - Re: [PATCH v2] time: Remove CONFIG_TIMER

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Date:   Wed, 8 Feb 2017 15:30:27 -0500
From:   Dave Jones <davej@...emonkey.org.uk>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Xing Gao <xgao01@...il.wm.edu>,
        Jessica Frazelle <me@...sfraz.com>,
        John Stultz <john.stultz@...aro.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Jonathan Corbet <corbet@....net>, Tejun Heo <tj@...nel.org>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Petr Mladek <pmladek@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Nicolas Iooss <nicolas.iooss_linux@....org>,
        Nicolas Pitre <nicolas.pitre@...aro.org>,
        Richard Cochran <richardcochran@...il.com>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Michal Marek <mmarek@...e.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Olof Johansson <olof@...om.net>, Shuah Khan <shuah@...nel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCH v2] time: Remove CONFIG_TIMER_STATS

On Wed, Feb 08, 2017 at 11:54:30AM -0800, Linus Torvalds wrote:
 > On Wed, Feb 8, 2017 at 11:26 AM, Kees Cook <keescook@...omium.org> wrote:
 > >
 > > Given that the tracer can give the same information, this patch entirely
 > > removes CONFIG_TIMER_STATS.
 > >
 > > Suggested-by: Thomas Gleixner <tglx@...utronix.de>
 > > Signed-off-by: Kees Cook <keescook@...omium.org>
 > > Acked-by: John Stultz <john.stultz@...aro.org>
 > 
 > Looks good to me. Let's wait for the 4.11 merge window though. I'm
 > assuming I'll get this through the tip timer tree..

>From a quick look at the source, powertop uses this file, and appears to
handle it gracefully if it fails to open, but it will lose functionality
to determine if a timer is deferred.

	Dave