From mboxrd@z Thu Jan  1 00:00:00 1970
From: Brendan Gregg <brendan.d.gregg@gmail.com>
Subject: perf user SDT markers
Date: Sat, 11 Apr 2015 19:13:08 -0700
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To: "linux-perf-use." <linux-perf-users@vger.kernel.org>, hemant@linux.vnet.ibm.com

G'Day,

I was just trying Hemant Kumar's user SDT patch
(http://lwn.net/Articles/618956/); anyone else tried it recently? I
applied it to 4.0.0-rc6, and it creates instrumentation, but doesn't
record the probes.

This works (it finds the Node.js probes):

# ./perf sdt-cache --dump
/home/bgregg-testtest/node-standard/out/Release/node:
   %node:net__server__connection
   %node:net__stream__end
   %node:net__socket__read
   %node:net__socket__write
   %node:http__server__request
   %node:http__server__response
   %node:http__client__request
   %node:http__client__response
   %node:gc__done
   %node:gc__start

But I can't "perf list" or record them:

# ./perf record -e '%node:http__server__request' -aR
invalid or unsupported event: '%node:http__server__request'
Run 'perf list' for a list of valid events
[...]

stap works:

# /root/systemtap-2.8/bin/stap -e 'probe
process("/home/bgregg-testtest/node-standard/out/Release/node").mark("http__server__request")
{ println("hit"); }'
hit
hit

Brendan