From: Daniel.Thibault@drdc-rddc.gc.ca (Thibault, Daniel)
Subject: [lttng-dev] About Lttng trace mode
Date: Tue, 4 Feb 2014 15:24:41 +0000 [thread overview]
Message-ID: <48CF5AC71E61DB46B70D0F388054EFFD267DE171@VAL-E-02.valcartier.drdc-rddc.gc.ca> (raw)
Date: Mon, 3 Feb 2014 16:03:14 +0000 (UTC)
From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
>----- Original Message -----
>> From: "Daniel Thibault" <Daniel.Thibault@drdc-rddc.gc.ca>
>> Sent: Thursday, November 14, 2013 12:01:25 PM
>>
>> [...]
>> or by the consumer. In discard mode, while a sub-buffer is locked for
>> consumer access, should the writers go around the set of sub-buffers and
>> [...]
>
>The paragraph above is true, except for the part "while a sub-buffer is locked for consumer access". In discard mode, as soon as the writer is filling up all sub-buffers, and thus the >produced sub-buffers count reaches the consumed sub-buffer count minus the number of sub-buffers in the buffer (this is a buffer full situation), events are discarded. This is done >independently of whether or not the consumer is currently locking a sub-buffer for reading.
Good, subtle point. The sub-buffer is marked for consumption ("read-ready"), just not actively locked ("being read").
Daniel U. Thibault
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next reply other threads:[~2014-02-04 15:24 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-04 15:24 Thibault, Daniel [this message]
-- strict thread matches above, loose matches on Subject: below --
2013-11-14 17:01 Thibault, Daniel
2013-11-15 3:39 ` XIANG Hao
2014-02-03 16:03 ` Mathieu Desnoyers
2013-11-14 13:24 XIANG Hao
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