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Re: Can't set statement probe in self-built linux-4.4
- From: David Smith <dsmith at redhat dot com>
- To: Chris Dunlop <chris at onthe dot net dot au>, "Frank Ch. Eigler" <fche at redhat dot com>
- Cc: systemtap at sourceware dot org
- Date: Fri, 1 Jul 2016 11:11:54 -0500
- Subject: Re: Can't set statement probe in self-built linux-4.4
- Authentication-results: sourceware.org; auth=none
- References: <20160630075744 dot GA3637 at onthe dot net dot au> <y0mk2h6vi3c dot fsf at fche dot csb> <20160630223410 dot GB16787 at onthe dot net dot au>
On 06/30/2016 05:34 PM, Chris Dunlop wrote:
> Hi Frank,
>
> On Thu, Jun 30, 2016 at 10:58:47AM -0400, Frank Ch. Eigler wrote:
>>> [...]
>>> I can't seem to set statement probes in a self-built linux-4.4. What can
>>> be going wrong? [...]
>
> [...]
>
>> Have you tried:
>>
>> $ stap -L 'kernel.statement("register_shrinker@*:*")'
>>
>> to get the list of line numbers that systemtap recognizes?
>
> No, I hadn't come across that option in my travels - that's useful!
> Unfortunately it doesn't come back with anything:
>
> $ stap -v -L 'kernel.statement("register_shrinker@*:*")'
> Pass 1: parsed user script and 116 library scripts using 93372virt/31140res/3000shr/28456data kb, in 190usr/20sys/206real ms.
> Pass 2: analyzed script: 0 probes, 0 functions, 0 embeds, 0 globals using 131260virt/69116res/3764shr/66344data kb, in 310usr/40sys/354real ms.
Hmm. Please try the following:
# stap -L 'kernel.function("register_shrinker").*'
That should let us know if 'register_shrinker' is only inlined in your
kernel.
--
David Smith
dsmith@redhat.com
Red Hat
http://www.redhat.com
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