Hi Kienan, Thank you very much for the information and solution.
Best, Yonghong On Tue, Nov 28, 2023 at 10:20 AM Kienan Stewart <kstew...@efficios.com> wrote: > Hi Yonghong, > > My understanding is that the limit of 10 trac epoint arguments was > initially chosen because it matched with the argumente limit in SDT > probe points and there is optional integration between LTTng trace > points and SDT. More recent versions of SDT, as of 1.7+, support up to > 12 arguments for probe points. > > Beyond that, there may be standards/compiler-specific limits for the > number of parameters to macros and/or function calls, but I don't think > we're close to hitting any of those. > > Note that the LTTNG_UST_TRACEPOINT_FIELDS macro doesn't share the same > 10 field limit. > > Therefore, one work-around that is possible to to pack the values into a > custom structure to reduce the number of arguments that need to be set > in the lTTNG_UST_TRACEPOINT_ARGS macro. > > eg. > > ``` > LTTNG_UST_TRACEPOINT_EVENT( > tp, > many, > LTTNG_UST_TP_ARGS( > const struct Sample*, mystruct > ), > LTTNG_UST_TP_FIELDS( > lttng_ust_field_integer(int, a, mystruct->a) > lttng_ust_field_integer(int, b, mystruct->b) > lttng_ust_field_integer(int, c, mystruct->c) > lttng_ust_field_integer(int, e, mystruct->d) > lttng_ust_field_integer(int, f, mystruct->e) > lttng_ust_field_float(double, g, mystruct->g) > lttng_ust_field_float(double, h, mystruct->h) > lttng_ust_field_float(double, i, mystruct->i) > lttng_ust_field_float(double, j, mystruct->j) > lttng_ust_field_float(double, k, mystruct->k) > lttng_ust_field_string(string_field, mystruct->thing) > lttng_ust_field_string(string_field2, mystruct->thing2) > ) > ) > > ``` > > Hope this helps! > > thanks, > kienan > > On 2023-11-27 22:26, Yonghong Yan via lttng-dev wrote: > > I have a situation where I need to record more than 10 fields. If you > > can extend it to support more, but not introduce overhead of handling > > such rare cases, that will be great. > > > > Thanks > > Yonghong > > > > > > _______________________________________________ > > lttng-dev mailing list > > lttng-dev@lists.lttng.org > > https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev >
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