From: fche@redhat.com (Frank Ch. Eigler)
To: Pekka Enberg <penberg@kernel.org>
Cc: Hemant Kumar <hkshaw@linux.vnet.ibm.com>,
LKML <linux-kernel@vger.kernel.org>,
Srikar Dronamraju <srikar@linux.vnet.ibm.com>,
Peter Zijlstra <peterz@infradead.org>,
Oleg Nesterov <oleg@redhat.com>,
hegdevasant@linux.vnet.ibm.com, Ingo Molnar <mingo@redhat.com>,
anton@redhat.com, systemtap@sourceware.org,
Namhyung Kim <namhyung@kernel.org>,
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
aravinda@linux.vnet.ibm.com
Subject: Re: [PATCH v4 2/3] Support for perf to probe into SDT markers:
Date: Sat, 26 Oct 2013 07:16:05 -0400 [thread overview]
Message-ID: <y0mbo2cs2oa.fsf@fche.csb> (raw)
In-Reply-To: <CAOJsxLFKm3TxeTmGjbpr1r4sZ8fHcM481-5BM_Cq0J8hhtvBqQ@mail.gmail.com> (Pekka Enberg's message of "Fri, 25 Oct 2013 14:38:17 +0200")
Pekka Enberg <penberg@kernel.org> writes:
> Is there a technical reason why 'perf list' could not show all the
> available SDT markers on a system and that the 'mark to event'
> mapping cannot happen automatically? [...]
A quick experiment with:
find `echo $PATH | tr : ' '` -type f -perm -555 |
xargs readelf -n 2>/dev/null |
grep STAP 2>/dev/null
suggests reasonable performance for my F19 workstation (a second or
two over ~6000 executables), once all the ELF content is in the block
cache. According to a stap eventcount.stp run, that required about
50000 syscall.read events.
Note that a $PATH search excludes shared libraries, which can also
carry <sys/sdt.h> markers. Adding /usr/lib* in more than doubles the
work, then there's /usr/libexec etc.
- FChE
next prev parent reply other threads:[~2013-10-26 11:16 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-23 5:04 [PATCH v4 0/3] perf support to SDT markers Hemant Kumar
2013-10-23 5:04 ` [PATCH v4 1/3] SDT markers listing by perf: Hemant Kumar
2013-10-23 5:05 ` [PATCH v4 2/3] Support for perf to probe into SDT markers: Hemant Kumar
2013-10-24 5:45 ` Masami Hiramatsu
2013-10-24 10:25 ` Hemant Kumar
2013-10-25 12:38 ` Pekka Enberg
2013-10-25 12:59 ` Srikar Dronamraju
2013-10-25 14:20 ` Pekka Enberg
2013-10-25 15:20 ` David Ahern
2013-10-28 8:48 ` Pekka Enberg
2013-10-28 16:59 ` David Ahern
2013-10-28 18:45 ` Pekka Enberg
2013-10-29 9:55 ` Hemant Kumar
2013-10-29 14:05 ` Pekka Enberg
2013-10-29 19:41 ` Hemant Kumar
2013-10-30 10:22 ` Masami Hiramatsu
2013-10-26 9:50 ` Ingo Molnar
2013-10-28 8:56 ` Pekka Enberg
2013-10-28 10:57 ` Masami Hiramatsu
2013-10-29 5:50 ` Namhyung Kim
2013-10-26 11:16 ` Frank Ch. Eigler [this message]
2013-10-28 8:40 ` Pekka Enberg
2013-10-28 10:34 ` Ingo Molnar
2013-10-30 10:05 ` Masami Hiramatsu
2013-10-30 11:51 ` Pekka Enberg
2013-10-31 9:59 ` Ingo Molnar
2013-10-31 10:54 ` Mark Wielaard
2013-10-31 10:57 ` Ingo Molnar
2013-10-31 13:12 ` Peter Zijlstra
2013-10-31 13:23 ` Mark Wielaard
2013-10-30 13:30 ` Hemant Kumar
2013-10-28 11:23 ` Masami Hiramatsu
2013-10-28 12:42 ` Pekka Enberg
2013-10-28 14:11 ` Srikar Dronamraju
2013-10-28 14:21 ` Pekka Enberg
2013-10-28 17:31 ` Srikar Dronamraju
2013-10-28 17:48 ` Pekka Enberg
2013-10-29 3:19 ` Masami Hiramatsu
2013-10-29 5:31 ` Namhyung Kim
2013-10-29 14:51 ` Mark Wielaard
2013-10-29 19:54 ` Pekka Enberg
2013-10-29 2:51 ` Masami Hiramatsu
2013-10-23 5:05 ` [PATCH v4 3/3] Documentation regarding perf/sdt Hemant Kumar
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