linux-kernel - Re: [PATCH] tracer for sys_open()

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Message-ID: <20090203133251.GD29046@elte.hu>
Date:	Tue, 3 Feb 2009 14:32:51 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Pavel Machek <pavel@...e.cz>
Cc:	"Kok, Auke" <auke-jan.h.kok@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	powertop ml <power@...host.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	srostedt@...hat.com
Subject: Re: [PATCH] tracer for sys_open() - sreadahead


* Pavel Machek <pavel@...e.cz> wrote:

> On Tue 2009-01-27 12:08:04, Kok, Auke wrote:
> > 
> > This tracer monitors regular file open() syscalls. This is a fast
> > and low-overhead alternative to strace, and does not allow or
> > require to be attached to every process.
> > 
> > The tracer only logs succesfull calls, as those are the only ones we
> > are currently interested in, and we can determine the absolute path
> > of these files as we log.
> 
> Maybe fanotify() should be used instead?
> 
> Or maybe just plain strace? One slow boot should not really hurt...

ptrace is out of question for good tracing because it's not a transparent 
probe. (ptrace monopolizes the traced task - if we use that then we break 
regular strace usage.)

	Ingo
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