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

2014-09-18 Thread Fengguang Wu
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 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

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

2014-09-18 Thread Fengguang Wu
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...@intel.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,

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

2014-09-17 Thread Steven Rostedt
On Fri, 22 Aug 2014 19:43:02 +0800 Fengguang Wu 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

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

2014-09-17 Thread Steven Rostedt
On Fri, 22 Aug 2014 19:43:02 +0800 Fengguang Wu fengguang...@intel.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

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

2014-08-22 Thread Fengguang Wu
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 > > > >

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

2014-08-22 Thread Petr Mládek
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

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

2014-08-22 Thread Petr Mládek
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

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

2014-08-22 Thread Fengguang Wu
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

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

2014-08-21 Thread Fengguang Wu
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

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

2014-08-21 Thread Fengguang Wu
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

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

2013-11-05 Thread Paul E. McKenney
On Tue, Nov 05, 2013 at 04:43:06PM +0100, Petr Mladek wrote: > Hello Paul, > > Paul E. McKenney píše v Po 04. 11. 2013 v 09:02 -0800: > > On Fri, Nov 01, 2013 at 06:19:44PM +0100, Petr Mladek wrote: > > > Hi, > > > > > > I am doing some clean up in x86 ftrace code. I check the performance by > >

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

2013-11-05 Thread Petr Mladek
Hello Paul, Paul E. McKenney píše v Po 04. 11. 2013 v 09:02 -0800: > On Fri, Nov 01, 2013 at 06:19:44PM +0100, Petr Mladek wrote: > > Hi, > > > > I am doing some clean up in x86 ftrace code. I check the performance by > > switching between different tracers and by enabling and disabling them. >

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

2013-11-05 Thread Petr Mladek
Hello Paul, Paul E. McKenney píše v Po 04. 11. 2013 v 09:02 -0800: On Fri, Nov 01, 2013 at 06:19:44PM +0100, Petr Mladek wrote: Hi, I am doing some clean up in x86 ftrace code. I check the performance by switching between different tracers and by enabling and disabling them. The

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

2013-11-05 Thread Paul E. McKenney
On Tue, Nov 05, 2013 at 04:43:06PM +0100, Petr Mladek wrote: Hello Paul, Paul E. McKenney píše v Po 04. 11. 2013 v 09:02 -0800: On Fri, Nov 01, 2013 at 06:19:44PM +0100, Petr Mladek wrote: Hi, I am doing some clean up in x86 ftrace code. I check the performance by switching

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

2013-11-04 Thread Paul E. McKenney
On Fri, Nov 01, 2013 at 06:19:44PM +0100, Petr Mladek wrote: > Hi, > > I am doing some clean up in x86 ftrace code. I check the performance by > switching between different tracers and by enabling and disabling them. > > The operation has started to be much slower after rebasing on the > kernel

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

2013-11-04 Thread Paul E. McKenney
On Fri, Nov 01, 2013 at 06:19:44PM +0100, Petr Mladek wrote: Hi, I am doing some clean up in x86 ftrace code. I check the performance by switching between different tracers and by enabling and disabling them. The operation has started to be much slower after rebasing on the kernel tip

rcu: Throttle rcu_try_advance_all_cbs() execution causes visible slowdown in ftrace switching

2013-11-01 Thread Petr Mladek
Hi, I am doing some clean up in x86 ftrace code. I check the performance by switching between different tracers and by enabling and disabling them. The operation has started to be much slower after rebasing on the kernel tip tree. Bisecting has shown that the difference was caused by the commit

rcu: Throttle rcu_try_advance_all_cbs() execution causes visible slowdown in ftrace switching

2013-11-01 Thread Petr Mladek
Hi, I am doing some clean up in x86 ftrace code. I check the performance by switching between different tracers and by enabling and disabling them. The operation has started to be much slower after rebasing on the kernel tip tree. Bisecting has shown that the difference was caused by the commit