linux-kernel - Re: rcu: Throttle rcu_try_advance_all_cbs() execution causes visible slowdown in ftrace switching

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Message-ID: <20140918124531.GA7546@localhost>
Date:	Thu, 18 Sep 2014 20:45:31 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Petr Mládek <pmladek@...e.cz>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Tibor Billes <tbilles@....com>,
	Josh Triplett <josh@...htriplett.org>,
	Jiri Kosina <jkosina@...e.cz>, linux-kernel@...r.kernel.org,
	Wanlong Gao <gaowanlong@...fujitsu.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Subject: Re: rcu: Throttle rcu_try_advance_all_cbs() execution causes visible
 slowdown in ftrace switching

HI Steven,

On Wed, Sep 17, 2014 at 10:42:51AM -0400, Steven Rostedt wrote:
> On Fri, 22 Aug 2014 19:43:02 +0800
> Fengguang Wu <fengguang.wu@...el.com> wrote:
> 
> > On Fri, Aug 22, 2014 at 10:32:57AM +0200, Petr Mládek wrote:
> > > On Fri 2014-08-22 11:35:29, Fengguang Wu wrote:
> > > > Hi Petr,
> > > > 
> > > > Sorry for picking up this old thread, but I noticed your attached
> > > > ftrace test script and would like to ask for your permission to
> > > > include it in
> > > > 
> > > >         https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git
> > > > 
> > > > which is GPLv2. If you kindly agree, I'll run it actively for testing
> > > > the upstream linux kernels.
> > > 
> > > Sure. Feel free to use the test script under GPLv2 license.
> > 
> > Great, thank you very much!
> > 
> > Fengguang
> 
> Sorry for the very late reply, I've been on vacation and then had some
> medical issues.
> 
> Note, I'm working with Masami to include lots of ftrace tests that will
> supersede this script. The tests will be included in
> tools/testing/selftests. Look for the subject "ftracetest".

Yes I just see the patches from Masami. We'll add them to the LKP
test suites. Thank you very much for letting me know!

Regards,
Fengguang

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