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From: Li Zefan <lizf@cn.fujitsu.com>
To: Randy Dunlap <randy.dunlap@oracle.com>
Cc: lkml <linux-kernel@vger.kernel.org>,
	eduard.munteanu@linux360.ro,
	Pekka Enberg <penberg@cs.helsinki.fi>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Ingo Molnar <mingo@elte.hu>
Subject: Re: kmemtrace.txt question: kernel parameter(s)?
Date: Fri, 18 Dec 2009 08:57:49 +0800	[thread overview]
Message-ID: <4B2AD38D.3070605@cn.fujitsu.com> (raw)
In-Reply-To: <20091217141342.9ae2072b.randy.dunlap@oracle.com>

Randy Dunlap wrote:
> Hi,
> 
> Documentation/trace/kmemtrace.txt says:
> 
> Q: 'cat /sys/kernel/debug/kmemtrace/total_overruns' is non-zero, how do I fix
> this? Should I worry?
> A: If it's non-zero, this affects kmemtrace's accuracy, depending on how
> large the number is. You can fix it by supplying a higher
> 'kmemtrace.subbufs=N' kernel parameter.
> 
> 
> Where is this kernel parameter implemented and where is it documented?
> or should this Answer just be fixed?
> 

The whole documentation is out-dated. The original kmemtrace was based on
relay, and then it moved to ftrace, without updating the documentation.

  reply	other threads:[~2009-12-18  0:58 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-12-17 22:13 kmemtrace.txt question: kernel parameter(s)? Randy Dunlap
2009-12-18  0:57 ` Li Zefan [this message]
2009-12-24  0:00   ` Randy Dunlap
2010-03-27  4:27   ` Randy Dunlap
2010-03-28  8:26     ` [PATCH] Remove Documentation/trace/kmemtrace.txt Eduard - Gabriel Munteanu
2010-03-28  8:33       ` Pekka Enberg

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