linux-kernel - Re: [PATCH] rudimentary tracing for Classic RCU

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Date:	Thu, 9 Oct 2008 12:23:13 +0200
From:	"Frédéric Weisbecker" <fweisbec@...il.com>
To:	paulmck@...ux.vnet.ibm.com
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, rjw@...k.pl,
	dipankar@...ibm.com, tglx@...uxtronix.de, andi@...stfloor.org
Subject: Re: [PATCH] rudimentary tracing for Classic RCU

2008/10/9 Paul E. McKenney <paulmck@...ux.vnet.ibm.com>:
> Hello!
>
> This is a tracing patch for Classic RCU, which creates an "rcu/rcucb"
> file in debugfs.  This patch can be handy when you need to work out
> why RCU is refusing to end the current grace period.
>
> Reading from the file results in something like the following:
>
>        rcu: cur=1129  completed=1128  np=0  s=0
>                0,3,7
>        rcu_bh: cur=-287  completed=-287  np=0  s=0
>
>        online: 0-7


Hi Paul,

Why don't you use the ring-buffer tracing engine?
You will really make your life better by putting it as a tracer in
kernel/trace and by using the relevant API.
That will avoid you to manage the debugfs things, the memory
allocation, the buffer managment.....
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