linux-kernel - Re: [PATCH v3] perf lock: add "info" subcommand for dumping misc information

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Date:	Wed, 5 May 2010 23:10:57 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Hitoshi Mitake <mitake@....info.waseda.ac.jp>
Cc:	linux-kernel@...r.kernel.org, h.mitake@...il.com,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Jason Baron <jbaron@...hat.com>,
	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
Subject: Re: [PATCH v3] perf lock: add "info" subcommand for dumping misc
	information

On Mon, May 03, 2010 at 02:12:00PM +0900, Hitoshi Mitake wrote:
> Hi Frederic,
> 
> I added "info" subcommand to perf lock,
> this can be used as dumping metadata like thread or address of lock instances.
> "map" was removed because info should do the work of it.
> 
> This will be useful not only for debugging but also for ordinary analyzing.
> 
> I made this patch on perf/core of your tree, could you queue this?
> 
> v2: adding example of usage
> % sudo ./perf lock info -t
>  | Thread ID: comm
>  | 	 0: swapper
>  |         1: init
>  |        18: migration/5
>  |        29: events/2
>  |        32: events/5
>  |        33: events/6
> ...
> 
> % sudo ./perf lock info -m
> | Address of instance: name of class
> |  0xffff8800b95adae0: &(&sighand->siglock)->rlock
> |  0xffff8800bbb41ae0: &(&sighand->siglock)->rlock
> |  0xffff8800bf165ae0: &(&sighand->siglock)->rlock
> |  0xffff8800b9576a98: &p->cred_guard_mutex
> |  0xffff8800bb890a08: &(&p->alloc_lock)->rlock
> |  0xffff8800b9522a08: &(&p->alloc_lock)->rlock
> |  0xffff8800bb8aaa08: &(&p->alloc_lock)->rlock
> |  0xffff8800bba72a08: &(&p->alloc_lock)->rlock
> |  0xffff8800bf18ea08: &(&p->alloc_lock)->rlock
> |  0xffff8800b8a0d8a0: &(&ip->i_lock)->mr_lock
> |  0xffff88009bf818a0: &(&ip->i_lock)->mr_lock
> |  0xffff88004c66b8a0: &(&ip->i_lock)->mr_lock
> |  0xffff8800bb6478a0: &(shost->host_lock)->rlock
> 
> v3: fixed some problems Frederic pointed out
>  * better rbtree tracking in dump_threads()
>  * removed printf() and used pr_info() and pr_debug()



Applied, thanks Hitoshi!

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