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

[Randy Dunlap <randy.dunlap@oracle.com>]

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