Re: increase size of number of possible tracing events

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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 <aeden@xxxxxxxxxxxxx> 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.

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