linux-kernel - Re: kmemtrace.txt question: kernel parameter(s)?

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Message-Id: <20091223160050.0c282ad2.randy.dunlap@oracle.com>
Date:	Wed, 23 Dec 2009 16:00:50 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	lkml <linux-kernel@...r.kernel.org>, eduard.munteanu@...ux360.ro,
	Pekka Enberg <penberg@...helsinki.fi>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: kmemtrace.txt question: kernel parameter(s)?

On Fri, 18 Dec 2009 08:57:49 +0800 Li Zefan wrote:

> 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.

Thank you.  I guess that explains why kmemtraced (from kmemtrace-user.git)
fails with:
Could not open() file /sys/kernel/debug/kmemtrace/cpu0: No such file or directory

Eduard, can we get Documentation/trace/kmemtrace.txt updated, please?

---
~Randy
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