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From: "Frank Ch. Eigler" <fche@redhat.com>
To: Anthony Eden <aeden@csail.mit.edu>
Cc: Steven Rostedt <rostedt@goodmis.org>,
	linux-trace-users@vger.kernel.org, kaslevs@vmware.com
Subject: Re: increase size of number of possible tracing events
Date: Mon, 1 Jul 2019 08:58:31 -0400
Message-ID: <20190701125831.GA11858@redhat.com> (raw)
In-Reply-To: <CAHMsQjX4MH+nHB66s-95FGXpOz_O=XJwnQw6RJRaa_rchQMPeA@mail.gmail.com>

Hi -

> Using ptrace to do this turns out to be absurdly slow, as one might
> expect (I wrote a python script for lldb). If anyone would like to see
> the actual numbers let me know.

In the mean time, you can also try systemtap userspace probes.  These
normally use kernel uprobes, but not the ftrace/perf-event mechanism,
so are not limited in number.  A user can also opt to configure pure
userspace dyninst to instrument.

- FChE

      reply index

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-21 22:14 Anthony Eden
2019-06-21 23:13 ` Steven Rostedt
2019-06-26 15:46 ` Steven Rostedt
2019-06-27 16:44   ` Anthony Eden
2019-06-30 14:31     ` Anthony Eden
2019-07-01 12:58       ` Frank Ch. Eigler [this message]

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