From: Andrew.McDermott@windriver.com (McDermott, Andrew)
Subject: [lttng-dev] getting a notification from 'lttng start|stop'
Date: Thu, 25 Oct 2012 11:49:41 +0000 [thread overview]
Message-ID: <7F632A9222059A42AF70FCB7965774AA208660DB@ALA-MBB.corp.ad.wrs.com> (raw)
Is it possible to see when tracing has actually started (i.e., when
`lttng start' is invoked)?
I can observe that the tracepoint is enabled/disabled by looking at the
'state' field in a 'struct tracepoint'. Is there an equivalent variable
to monitor for `lttng start|stop'? I was trying to dump some additional
process state (via calls to tracepoint) whenever an external
start/stop/start/stop/start sequence occurs.
Also, when I run 'lttng enable-event -u -a' I see that the 'state' value
changes from '0' to '1', but if I run 'lttng disable-event -u -a' it
stays at '1'. Is this expected? If I subsequently run 'lttng destroy'
then it does go to '0'. Shouldn't the disable set it to '0' too?
--
andy
reply other threads:[~2012-10-25 11:49 UTC|newest]
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