linux-kernel - Re: [PATCH v7 1/4] spinlock: A new lockref structure for lockless update of refcount

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Date:	Fri, 30 Aug 2013 12:57:38 +0200
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Waiman Long <waiman.long@...com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Jeff Layton <jlayton@...hat.com>,
	Miklos Szeredi <mszeredi@...e.cz>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Andi Kleen <andi@...stfloor.org>,
	"Chandramouleeswaran, Aswin" <aswin@...com>,
	"Norton, Scott J" <scott.norton@...com>
Subject: Re: [PATCH v7 1/4] spinlock: A new lockref structure for lockless
 update of refcount

On Fri, Aug 30, 2013 at 12:52 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Fri, Aug 30, 2013 at 12:44:29PM +0200, Sedat Dilek wrote:
>> Please, see advices in 'tools/Makefile':
>>
>>         @echo 'You can do:'
>>         @echo ' $$ make -C tools/ <tool>_install'
>>         @echo ''
>>         @echo '  from the kernel command line to build and install one of'
>>         @echo '  the tools above'
>>         @echo ''
>>         @echo '  $$ make tools/install'
>>         @echo ''
>>         @echo '  installs all tools.'
>
> I never follow advice :-) Muwhaha, also I'm generally not interested in
> 'all' tools anywya.
>
>> If you tell me where you discuss perf issues I can describe the problem.
>
> On this list, start a new thread CC ingo, acme and me. There's also an
> IRC channel but I keep forgetting what the official channel is and I'm
> likely not on it. I do tend to abuse irc.oftc.net/#linux-rt for it since
> most people are on there anyway.

Hi rebel :-)!

I was away from IRC for quite a year.
I will write some words...

- Sedat -

P.S.: It worked...

$ ~/src/linux-kernel/linux/tools/perf/perf --version
perf version 3.11.rc7.ga7370

$ ~/src/linux-kernel/linux/tools/perf/perf stat --null --repeat 5
./t_lockref_from-linus
Total loops: 2652351
Total loops: 2604876
Total loops: 2649696
Total loops: 2651417
Total loops: 2644068

 Performance counter stats for './t_lockref_from-linus' (5 runs):

      10,002926693 seconds time elapsed
          ( +-  0,00% )

$ cat /proc/version
Linux version 3.11.0-rc7-1-lockref-small
(sedat.dilek@...il.com@...box) (gcc version 4.6.3 (Ubuntu/Linaro
4.6.3-1ubuntu5) ) #1 SMP Fri Aug 30 10:23:19 CEST 2013
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