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To: Nan Xiao <xiaonan830818@gmail.com>
Cc: systemtap@sourceware.org
Subject: Re: How does stap execute probe aliases?
References: <CA+MhoaPAiF2zf6J=3bCP=5Dtc=60T0+_igCSZk7028kTua0y8g@mail.gmail.com>
From: fche@redhat.com (Frank Ch. Eigler)
Date: Fri, 20 Nov 2015 16:12:00 -0000
In-Reply-To: <CA+MhoaPAiF2zf6J=3bCP=5Dtc=60T0+_igCSZk7028kTua0y8g@mail.gmail.com> (Nan Xiao's message of "Fri, 20 Nov 2015 17:59:47 +0800")
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xiaonan830818 wrote:

> I try to execute the following script from this page
> (https://sourceware.org/systemtap/SystemTap_Beginners_Guide/targetavailable.html#available):
> [...]
> Why can't the stap find the probes? Thanks in advance!

Because that script defines aliases only (kind of like a #define FOO BAR
in a C program), and doesn't instantiate them (FOO in a C program).
So add

   probe vm.pagefault { /* ... */ }

to your script.

- FChE