linux-kernel - Re: [ANNOUNCE] ktap 0.1 released

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Message-ID: <20130521161903.333d7e74@lwn.net>
Date:	Tue, 21 May 2013 16:19:03 -0600
From:	Jonathan Corbet <corbet@....net>
To:	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [ANNOUNCE] ktap 0.1 released

On Tue, 21 May 2013 11:56:14 +0800
"zhangwei(Jovi)" <jovi.zhangwei@...wei.com> wrote:

> we welcome bug reports and fixes for the issues.

I'm messing with it...first impression:

	unable create tracepoint event sys_enter_mmap on cpu 4, err: -19
	unable create tracepoint event sys_enter_mmap on cpu 5, err: -19
	unable create tracepoint event sys_enter_mmap on cpu 6, err: -19
	unable create tracepoint event sys_enter_mmap on cpu 7, err: -19
	[...]

Unsurprising, this is a four-core system.  The code reads:

> 	for_each_possible_cpu(cpu)
>		enable_tracepoint_on_cpu(cpu, &attr, call, arg, type);

Maybe that needs to be for_each_online_cpu() instead?

jon
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