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charset="us-ascii"; Format="flowed" Errors-To: lttng-dev-bounces@lists.lttng.org Sender: "lttng-dev" Hello Bala, If you'd like more information about which event types (tracepoints) are practical for investigating which areas, the `ltting-utils` [1] project could be useful! The repository contains scripts that record LTTng traces. Each script is focused on a different investigation area (e.g. network, interrupts, disk, etc). You could use the scripts themselves and/or read the `*.profile` files [2] to see the event types enabled by the different profiles. For example, in the disk analysis profile (disk.profile), the following event types are enabled: - block_rq_complete - block_rq_insert - block_rq_issue - block_bio_frontmerge As Millian suggested, it is often best to only trace the event types you need for the type of issue you are investigating since this increases the accuracy of the data collected (less tracing overhead, fewer dropped events) and also makes the trace easier to understand (less data volume, less data noise). Best, Erica ---- LINKS [1] lttng-utils: https://github.com/tahini/lttng-utils/tree/master [2] Tracing Profiles: https://github.com/tahini/lttng-utils/tree/master/lttngutils/profiles On 2023-08-15 01:24, Milian Wolff via lttng-dev wrote: > On Sonntag, 13. August 2023 16:58:17 CEST Bala Gundeboina via lttng-dev wrote: >> Hi, >> >> I am Using LTTng in my project , I am recording a kernel session for long >> duration (eg more than 15minutes) I am enabling all the events for >> recording but some events discarding after stopping the session, if i run >> more than 5 minutes only some events are discarding. I have tried to change >> in the .ltttngrc file also to increase buffer-size. > > While not directly related to your question, I strongly encourage you to > review the list of events and only enable those that are actually required for > the specific issue you are investigating. Some kernel events are _extremely_ > high frequency but have often no practical use for many (at least in my > experience and for my own purposes). Examples for the latter are esp. the > kmalloc tracepoints. > >> lttng destroy >> Destroying session `my-kernel-session`... >> Session `my-kernel-session` destroyed >> Warning: 94424667 events were discarded, please refer to the documentation >> on channel configuration >> >> actually when i am running below command i am getting below warning i am >> thinking this is the issue because sometimes this warning is not coming >> that i didn't seen discarded events. how to overcome this problem can you >> provide some detailed lttng-sessiond --daemonize >> Warning: Failed to produce a random seed using getrandom(), falling back to >> pseudo-random device seed generation which will block until its pool is >> initialized: Failed to get true random data using getre >> >> Thanks & Regards >> Bala Gundeboina >> This message contains information that may be privileged or confidential and >> is the property of the KPIT Technologies Ltd. It is intended only for the >> person to whom it is addressed. If you are not the intended recipient, you >> are not authorized to read, print, retain copy, disseminate, distribute, or >> use this message or any part thereof. If you receive this message in error, >> please notify the sender immediately and delete all copies of this message. >> KPIT Technologies Ltd. does not accept any liability for virus infected >> mails. > > _______________________________________________ lttng-dev mailing list lttng-dev@lists.lttng.org https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev