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From: Wu Fengguang <fengguang.wu@intel.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: "Frédéric Weisbecker" <fweisbec@gmail.com>,
	"Steven Rostedt" <rostedt@goodmis.org>,
	"Peter Zijlstra" <a.p.zijlstra@chello.nl>,
	"Li Zefan" <lizf@cn.fujitsu.com>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	LKML <linux-kernel@vger.kernel.org>,
	"KOSAKI Motohiro" <kosaki.motohiro@jp.fujitsu.com>,
	"Andi Kleen" <andi@firstfloor.org>,
	"Matt Mackall" <mpm@selenic.com>,
	"Alexey Dobriyan" <adobriyan@gmail.com>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: ftrace: concurrent accesses possible?
Date: Fri, 8 May 2009 20:58:21 +0800	[thread overview]
Message-ID: <20090508125821.GC15949@localhost> (raw)
In-Reply-To: <20090508114742.GB17129@elte.hu>

Hello,

On Fri, May 08, 2009 at 07:47:42PM +0800, Ingo Molnar wrote:
> 
> So this should be done in cooperation with instrumentation folks, 
> while improving _all_ of Linux instrumentation in general. Or, if 
> you dont have the time/interest to work with us on that, it should 
> not be done at all. Not having the resources/interest to do 
> something properly is not a license to introduce further 
> instrumentation crap into Linux.

I have a dummy question on /debug/trace: is it possible to
- use 2+ tracers concurrently?
- run a system script that makes use of a tracer,
  without disturbing the sysadmin's tracer activities?
- access 1 tracer concurrently from many threads,
  with different filter etc. options?

If not currently, will private mounts be a viable solution?

Thanks,
Fengguang

WARNING: multiple messages have this Message-ID (diff)
From: Wu Fengguang <fengguang.wu@intel.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: "Frédéric Weisbecker" <fweisbec@gmail.com>,
	"Steven Rostedt" <rostedt@goodmis.org>,
	"Peter Zijlstra" <a.p.zijlstra@chello.nl>,
	"Li Zefan" <lizf@cn.fujitsu.com>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	LKML <linux-kernel@vger.kernel.org>,
	"KOSAKI Motohiro" <kosaki.motohiro@jp.fujitsu.com>,
	"Andi Kleen" <andi@firstfloor.org>,
	"Matt Mackall" <mpm@selenic.com>,
	"Alexey Dobriyan" <adobriyan@gmail.com>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: ftrace: concurrent accesses possible?
Date: Fri, 8 May 2009 20:58:21 +0800	[thread overview]
Message-ID: <20090508125821.GC15949@localhost> (raw)
In-Reply-To: <20090508114742.GB17129@elte.hu>

Hello,

On Fri, May 08, 2009 at 07:47:42PM +0800, Ingo Molnar wrote:
> 
> So this should be done in cooperation with instrumentation folks, 
> while improving _all_ of Linux instrumentation in general. Or, if 
> you dont have the time/interest to work with us on that, it should 
> not be done at all. Not having the resources/interest to do 
> something properly is not a license to introduce further 
> instrumentation crap into Linux.

I have a dummy question on /debug/trace: is it possible to
- use 2+ tracers concurrently?
- run a system script that makes use of a tracer,
  without disturbing the sysadmin's tracer activities?
- access 1 tracer concurrently from many threads,
  with different filter etc. options?

If not currently, will private mounts be a viable solution?

Thanks,
Fengguang

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  parent reply	other threads:[~2009-05-08 12:59 UTC|newest]

Thread overview: 92+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-05-08 10:53 [PATCH 0/8] export more page flags in /proc/kpageflags (take 6) Wu Fengguang
2009-05-08 10:53 ` Wu Fengguang
2009-05-08 10:53 ` [PATCH 1/8] mm: introduce PageHuge() for testing huge/gigantic pages Wu Fengguang
2009-05-08 10:53   ` Wu Fengguang
2009-05-08 11:40   ` Ingo Molnar
2009-05-08 11:40     ` Ingo Molnar
2009-05-08 12:21     ` Wu Fengguang
2009-05-08 12:21       ` Wu Fengguang
2009-05-13 17:05   ` Mel Gorman
2009-05-13 17:05     ` Mel Gorman
2009-05-17 13:09     ` Wu Fengguang
2009-05-17 13:09       ` Wu Fengguang
2009-05-08 10:53 ` [PATCH 2/8] slob: use PG_slab for identifying SLOB pages Wu Fengguang
2009-05-08 10:53   ` Wu Fengguang
2009-05-08 10:53 ` [PATCH 3/8] proc: kpagecount/kpageflags code cleanup Wu Fengguang
2009-05-08 10:53   ` Wu Fengguang
2009-05-08 10:53 ` [PATCH 4/8] proc: export more page flags in /proc/kpageflags Wu Fengguang
2009-05-08 10:53   ` Wu Fengguang
2009-05-08 11:47   ` Ingo Molnar
2009-05-08 11:47     ` Ingo Molnar
2009-05-08 12:44     ` Wu Fengguang
2009-05-08 12:44       ` Wu Fengguang
2009-05-09  5:59       ` Ingo Molnar
2009-05-09  5:59         ` Ingo Molnar
2009-05-09  7:56         ` Wu Fengguang
2009-05-09  7:56           ` Wu Fengguang
2009-05-09  6:27       ` [patch] tracing/mm: add page frame snapshot trace Ingo Molnar
2009-05-09  6:27         ` Ingo Molnar
2009-05-09  9:13         ` Wu Fengguang
2009-05-09  9:13           ` Wu Fengguang
2009-05-09  9:24           ` Ingo Molnar
2009-05-09  9:24             ` Ingo Molnar
2009-05-09  9:43             ` Wu Fengguang
2009-05-09  9:43               ` Wu Fengguang
2009-05-09 10:22               ` Ingo Molnar
2009-05-09 10:22                 ` Ingo Molnar
2009-05-09 10:45                 ` Wu Fengguang
2009-05-09 10:45                   ` Wu Fengguang
2009-05-09 10:01           ` Ingo Molnar
2009-05-09 10:01             ` Ingo Molnar
2009-05-09 10:27             ` Ingo Molnar
2009-05-09 10:27               ` Ingo Molnar
2009-05-09 10:57             ` Wu Fengguang
2009-05-09 10:57               ` Wu Fengguang
2009-05-09 11:05               ` Ingo Molnar
2009-05-09 11:05                 ` Ingo Molnar
2009-05-09 12:23                 ` Wu Fengguang
2009-05-09 12:23                   ` Wu Fengguang
2009-05-09 14:05                   ` Ingo Molnar
2009-05-09 14:05                     ` Ingo Molnar
2009-05-10  8:35                     ` Wu Fengguang
2009-05-10  8:35                       ` Wu Fengguang
2009-05-11 12:01                       ` Ingo Molnar
2009-05-11 12:01                         ` Ingo Molnar
2009-05-09 10:36           ` Ingo Molnar
2009-05-09 10:36             ` Ingo Molnar
2009-05-08 12:58     ` Wu Fengguang [this message]
2009-05-08 12:58       ` ftrace: concurrent accesses possible? Wu Fengguang
2009-05-08 13:17       ` Steven Rostedt
2009-05-08 13:17         ` Steven Rostedt
2009-05-08 13:43         ` Wu Fengguang
2009-05-08 13:43           ` Wu Fengguang
2009-05-08 20:24     ` [PATCH 4/8] proc: export more page flags in /proc/kpageflags Andrew Morton
2009-05-08 20:24       ` Andrew Morton
2009-05-09 10:44       ` Ingo Molnar
2009-05-09 10:44         ` Ingo Molnar
2009-05-10  3:58         ` Andrew Morton
2009-05-10  3:58           ` Andrew Morton
2009-05-10  5:26         ` Andrew Morton
2009-05-10  5:26           ` Andrew Morton
2009-05-11 11:45           ` Ingo Molnar
2009-05-11 11:45             ` Ingo Molnar
2009-05-11 18:31             ` Andrew Morton
2009-05-11 18:31               ` Andrew Morton
2009-05-11 22:08               ` Ingo Molnar
2009-05-11 22:08                 ` Ingo Molnar
2009-05-11 19:03             ` Andy Isaacson
2009-05-11 19:03               ` Andy Isaacson
2009-05-08 10:53 ` [PATCH 5/8] pagemap: document clarifications Wu Fengguang
2009-05-08 10:53   ` Wu Fengguang
2009-05-08 10:53 ` [PATCH 6/8] pagemap: document 9 more exported page flags Wu Fengguang
2009-05-08 10:53   ` Wu Fengguang
2009-05-09  8:13   ` KOSAKI Motohiro
2009-05-09  8:13     ` KOSAKI Motohiro
2009-05-09  8:18     ` Wu Fengguang
2009-05-09  8:18       ` Wu Fengguang
2009-05-08 10:53 ` [PATCH 7/8] pagemap: add page-types tool Wu Fengguang
2009-05-08 10:53   ` Wu Fengguang
2009-05-08 10:53 ` [PATCH 8/8] pagemap: export PG_hwpoison Wu Fengguang
2009-05-08 10:53   ` Wu Fengguang
2009-05-08 11:49   ` Ingo Molnar
2009-05-08 11:49     ` Ingo Molnar

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