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From: Anthony Eden <aeden@csail.mit.edu>
To: linux-trace-users@vger.kernel.org
Subject: increase size of number of possible tracing events
Date: Fri, 21 Jun 2019 18:14:54 -0400
Message-ID: <CAHMsQjVYHY1N=X9emeYg34XxeUaMRdV--3NYFNdy111sD0-0gg@mail.gmail.com> (raw)

I am trying to develop a patch which increases the maximum number of
possible tracing events (i.e. TRACE_EVENT_TYPE_MAX). I naively tried
changing unsigned short trace_entry::type to unsigned int (that simply
broke tracing).

Short background: I am placing a UProbe tracepoint at the start of
every basic block for every DSO in a dynamically-linked program. I
recently hit the ceiling for the maximum number of tracepoints with
dnsmasq;

/usr/bin/dnsmasq:            12826 basic blocks
/usr/lib/libc.so.6:          60511 basic blocks
/lib64/ld-linux-x86-64.so.2: 6270 basic blocks
linux-vdso.so.1:             36 basic blocks

Writing to /sys/kernel/debug/tracing/uprobe_events returns -ENODEV. If
anyone could provide some guidance towards raising the limit, it would
be much appreciated.

Thanks,
-Anthony

             reply index

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-21 22:14 Anthony Eden [this message]
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

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