> -----Original Message----- > From: Sebastian Huber <sebastian.hu...@embedded-brains.de> > Sent: Friday, March 5, 2021 5:46 PM > To: Sommer, Jan <jan.som...@dlr.de>; users@rtems.org > Subject: Re: rtems-record-lttng: Corrupted timestamps after translating to > CTF > > On 05/03/2021 16:11, jan.som...@dlr.de wrote: > > > Some of the resulting CTF events have a very large timestamp. This only > occurs for events of which are created by CPUs other than CPU0, but not all > of them. > > I ran rtems-record-lttng in gdb and could track it to record-client.c:176 > (https://git.rtems.org/rtems-tools/tree/trace/record/record-client.c#n176). > > There the (delta * ctx->to_bt_scaler ) causes an overflow and sets > per_cpu->uptime.bt to a very large negative number which then later > becomes a very large (positive) timestamp. > > > > I have some trouble figuring out what is going wrong here. The timestamps > which are read from the rtems record events looks quite reasonable to me. > > The to_bt_scaler is quite a large value and I don't fully get what it > > scales. > Does someone have some hints? > It could be related to ring buffer overflows. Do you get > RTEMS_RECORD_PER_CPU_OVERFLOW items? There could be also some > bugs in record-client.c. More unit tests for it would be helpful. >
I had some more time to look at this. It turns out that the RTEMS_RECORD_UPTIME_* events are always assigned to cpu 0. I checked the watchdog and indeed the _Record_Watchdog (https://git.rtems.org/rtems/tree/cpukit/libtrace/record/record-sysinit.c#n64) is executed twice, but always on cpu 0. I tested with the rv32imac bsp with 2 cores, each with its own RTEMS_SCHEDULER_PRIORITY_SMP and with the following defines: #define CONFIGURE_RECORD_PER_PROCESSOR_ITEMS 2048 #define CONFIGURE_RECORD_EXTENSIONS_ENABLED #define CONFIGURE_RECORD_FATAL_DUMP_BASE64_ZLIB Do I need to configure something else? I am not familiar with the watchdog part. The initialization looks good as far as I can tell. Best regards, Jan > -- > embedded brains GmbH > Herr Sebastian HUBER > Dornierstr. 4 > 82178 Puchheim > Germany > email: sebastian.hu...@embedded-brains.de > phone: +49-89-18 94 741 - 16 > fax: +49-89-18 94 741 - 08 > > Registergericht: Amtsgericht München > Registernummer: HRB 157899 > Vertretungsberechtigte Geschäftsführer: Peter Rasmussen, Thomas Dörfler > Unsere Datenschutzerklärung finden Sie hier: > https://embedded-brains.de/datenschutzerklaerung/ _______________________________________________ users mailing list users@rtems.org http://lists.rtems.org/mailman/listinfo/users
