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Date: Fri, 20 Nov 2015 09:59:00 -0000
Message-ID: <CA+MhoaPAiF2zf6J=3bCP=5Dtc=60T0+_igCSZk7028kTua0y8g@mail.gmail.com>
Subject: How does stap execute probe aliases?
From: Nan Xiao <xiaonan830818@gmail.com>
To: systemtap@sourceware.org
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Hi all,

I try to execute the following script from this page
(https://sourceware.org/systemtap/SystemTap_Beginners_Guide/targetavailable.html#available):

# cat two_probes.stp
#!/usr/bin/stap
probe vm.pagefault = kernel.function("__handle_mm_fault@mm/memory.c") ?,
                     kernel.function("handle_mm_fault@mm/memory.c") ?
{
        name = "pagefault"
        write_access = (@defined($flags)
                        ? $flags & FAULT_FLAG_WRITE : $write_access)
        address =  $address
}

# ./two_probes.stp
semantic error: no probes found
Pass 2: analysis failed.  [man error::pass2]

Why can't the stap find the probes? Thanks in advance!

Best Regards
Nan Xiao