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   do_tracepoint    ( 3 )

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Переменные окружения (Environment variables)

LTTNG_HOME Alternative user's home directory. This variable is useful when the user running the instrumented application has a non-writable home directory.

Unix sockets used for the communication between liblttng-ust and the LTTng session and consumer daemons (part of the LTTng-tools project) are located in a specific directory under $LTTNG_HOME (or $HOME if $LTTNG_HOME is not set).

LTTNG_UST_ALLOW_BLOCKING If set, allow the application to retry event tracing when there's no space left for the event record in the sub-buffer, therefore effectively blocking the application until space is made available or the configured timeout is reached.

To allow an application to block during tracing, you also need to specify a blocking timeout when you create a channel with the --blocking-timeout option of the lttng-enable-channel(1) command.

This option can be useful in workloads generating very large trace data throughput, where blocking the application is an acceptable trade-off to prevent discarding event records.

Warning Setting this environment variable may significantly affect application timings.

LTTNG_UST_CLOCK_PLUGIN Path to the shared object which acts as the clock override plugin. An example of such a plugin can be found in the LTTng-UST documentation under examples/clock-override <https://github.com/lttng/lttng- ust/tree/v2.10.6/doc/examples/clock-override>.

LTTNG_UST_DEBUG If set, enable liblttng-ust's debug and error output.

LTTNG_UST_GETCPU_PLUGIN Path to the shared object which acts as the getcpu() override plugin. An example of such a plugin can be found in the LTTng-UST documentation under examples/getcpu-override <https://github.com/lttng/lttng- ust/tree/v2.10.6/doc/examples/getcpu-override>.

LTTNG_UST_REGISTER_TIMEOUT Waiting time for the registration done session daemon command before proceeding to execute the main program (milliseconds).

The value 0 means do not wait. The value -1 means wait forever. Setting this environment variable to 0 is recommended for applications with time constraints on the process startup time.

Default: 3000.

LTTNG_UST_WITHOUT_BADDR_STATEDUMP If set, prevents liblttng-ust from performing a base address state dump (see the LTTng-UST state dump section above).

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