Re: increase size of number of possible tracing events
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- Subject: Re: increase size of number of possible tracing events
- From: "Frank Ch. Eigler" <fche@xxxxxxxxxx>
- Date: Mon, 1 Jul 2019 08:58:31 -0400
- Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>, linux-trace-users@xxxxxxxxxxxxxxx, kaslevs@xxxxxxxxxx
- In-reply-to: <CAHMsQjX4MH+nHB66s-95FGXpOz_O=XJwnQw6RJRaa_rchQMPeA@mail.gmail.com>
- References: <CAHMsQjVYHY1N=X9emeYg34XxeUaMRdV--3NYFNdy111sD0-0gg@mail.gmail.com> <20190626114601.6510c943@gandalf.local.home> <CAHMsQjV_uuhf6XPB7xype--V87_d7KeEgeks-7Qfw-2GVzLSrw@mail.gmail.com> <CAHMsQjX4MH+nHB66s-95FGXpOz_O=XJwnQw6RJRaa_rchQMPeA@mail.gmail.com>
- User-agent: Mutt/1.12.0 (2019-05-25)
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
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