linux-kernel - Re: [PATCH -tip -v11 11/11] tracing: Add kprobes event profiling interface

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Date:	Fri, 10 Jul 2009 14:46:48 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
CC:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	kvm <kvm@...r.kernel.org>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Tom Zanussi <tzanussi@...il.com>
Subject: Re: [PATCH -tip -v11 11/11] tracing: Add kprobes event profiling
 interface

> +Event Profiling
> +---------------
> + You can check the total number of probe hits and probe miss-hits via
> +/sys/kernel/debug/tracing/kprobe_profile.
> + The fist column is event name, the second is the number of probe hits,

s/fist/first

> +the third is the number of probe miss-hits.
> +
> +
...
> +/* Probes profiling interfaces */
> +static int profile_seq_show(struct seq_file *m, void *v)
> +{
> +	struct trace_probe *tp = v;
> +
> +	if (tp == NULL)
> +		return 0;
> +

tp will never be NULL, which is guaranteed by seq_file

> +	seq_printf(m, "%s", tp->call.name);
> +
> +	seq_printf(m, "\t%8lu %8lu\n", tp->nhits,
> +		   probe_is_return(tp) ? tp->rp.kp.nmissed : tp->kp.nmissed);
> +
> +	return 0;
> +}
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