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Re: analysis of polling in systemtap
On Mon, 2005-12-19 at 11:58 -0800, Martin Hunt wrote:
> > # there is also a race here.
> > delete called
>
> Yes, this is a much more serious race.
I shouldn't have said that. It is only more serious if you consider the
problem of dueling timer probes printing the same data at the same time,
which isn't something I plan to worry about.
The real problem I want to solve is how to better handle timer events
that print data and then clear a pmap. Because clearing a large pmap can
be expensive and could be done for free while aggregating it.
> The best way to fix this from an efficiency and reliability
> point of view is to simply add another flag to the runtime print and
> aggregation commands to clear the map as it is printed. I don't have any
> good ideas about how this would made part of the systemtap language.
>
> Martin
>
>