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From: Steven Rostedt <>
To: Anthony Eden <>,
Subject: Re: increase size of number of possible tracing events
Date: Fri, 21 Jun 2019 19:13:59 -0400
Message-ID: <> (raw)
In-Reply-To: <>

I'm currently traveling (replying on my phone so excuse the top post), but what you want will require a kernel change.

-- Steve

On June 21, 2019 6:14:54 PM EDT, Anthony Eden <> wrote:
>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
>/usr/bin/dnsmasq:            12826 basic blocks
>/usr/lib/          60511 basic blocks
>/lib64/ 6270 basic blocks
>             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.

Sent from my Android device with K-9 Mail. Please excuse my brevity and top posting.

  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 [this message]
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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