This is the mail archive of the systemtap@sourceware.org mailing list for the systemtap project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

disabled interrupts (Was bug #2293


hunt wrote:

> [...] You have now disabled interrupts, so the data [produced by end
> probes] fills the buffers but stpd cannot empty them.

How could stpd have emptied them before, in a reliable way?  During an
"end" probe, or when?  stpd can't run until the next timeslice; we
never cooperatively schedule out of a probe.

> So we have effectively limited systemtap output to whatever space is
> remaining in buffer when "probe end" is hit.  [...]

A couple of possible solutions: Use bigger buffers; put a buffer aside
for end probes; get stpd to empty all the buffers early during the
STP_EXIT exchange and thus before "end" probes run.

- FChE


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]