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

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Message-ID: <20090209131354.GC3205@nb.net.home>
Date:	Mon, 9 Feb 2009 14:13:54 +0100
From:	Karel Zak <kzak@...hat.com>
To:	Harald Hoyer <harald@...hat.com>
Cc:	linux-kernel@...r.kernel.org, power@...host.org
Subject: Re: [PATCH] tracer for sys_open() - sreadahead

On Thu, Feb 05, 2009 at 03:44:42PM +0100, Harald Hoyer wrote:
> Ingo Molnar wrote:
>> * 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
>
> Can strace can be used on init?
>
> $ man strace
> ...
>        On Linux, exciting as it would be, tracing the init process is forbidden.
> ...
>
> Any hope getting _any_ mechanism in the kernel??

 Do you remember Linux Auditing System? That's RH's baby with hooks to
 all relevant syscalls. It would be better to fix/improve the current
 kernel mechanisms that introduce a new one.

    Karel

-- 
 Karel Zak  <kzak@...hat.com>
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