Bug #970: snapshot written in 2 folders if it takes more than 1 second to record - LTTng-tools - LTTng bugs repository

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Bug #970

closed

snapshot written in 2 folders if it takes more than 1 second to record

Added by Julien Desfossez over 8 years ago. Updated almost 8 years ago.

Status:

Resolved

Priority:

Normal

Assignee:

Jonathan Rajotte Julien

Target version:

LTTng - 2.8

Start date:

11/03/2015

Due date:

% Done:

100%

Estimated time:

Description

With "lttng snapshot record" on a session with UST et kernel buffers, if the writing of one domain takes longer than 1 second, another folder is created when writing the data of the second domain.
Reproduced with master.

lttng create --snapshot
lttng enable-channel -k bla --subbuf-size 8M --num-subbuf 8
lttng enable-event -k -a -c bla
lttng enable-event -u -a
lttng start
... wait for the kernel ring-buffer to be full...
lttng snapshot record

If the disk takes longer than 1 second to write 64MB, the resulting snapshot looks like this:

ls /home/julien/lttng-traces/auto-20151103-174410
snapshot-1-20151103-174443-0/kernel/.....
snapshot-1-20151103-174446-0/ust.....

This is confusing because we expect all the traces of one snapshot to be in the same folder, especially when we record lots of them it becomes a mess to link the ones that belong together.