linux-kernel - Re: [PATCH 3/3] tracing/ksym_tracer: support quick clear for ksym_trace

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Date:	Thu, 23 Jul 2009 08:50:36 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	prasad@...ux.vnet.ibm.com
CC:	Ingo Molnar <mingo@...e.hu>,
	Alan Stern <stern@...land.harvard.edu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] tracing/ksym_tracer: support quick clear for	ksym_trace_filter



K.Prasad wrote:

> As I stated before, the ability to support
> echo "*:---" > ksym_trace_filter was Ingo Molnar's suggestion, so if
> he's not particular about having it now we may skip it.
> 

OK, I'll fix it.

> However, given that it requires just a few lines of code in addition,
> say
> 
> +	/* Clear all breakpoints if echo "*:---" > ksym_trace_filter */
> +	if ((strncmp(ksymname, "*", strlen("*")) == 0) && (op == 0)) {
> +		ksym_trace_reset(NULL);
> +		kfree(input_string);
> +		return count;
> +	}
> 

I think below way is simpler:

+	/*
+	/* Clear all breakpoints if:
+	/* 1: echo > ksym_trace_filter
+	/* 2: echo 0 > ksym_trace_filter
+	/* 3: echo "*:---" > ksym_trace_filter 
+	*/
+	strstrip(input_string);
+	if (!input_string[0] || !strcmp(input_string, "0") ||
+	   (!strcmp(input, "*:---")) {
+		__ksym_trace_reset();
+		kfree(input_string);
+		return count;
+	}
+

I'll sent a new patch after do some test for it.

Thanks,
Xiao

> in ksym_trace_filter_write(), and that the patch is already present it
> shouldn't be bothersome to add it.
> 
> Thanks,
> K.Prasad
> 
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