Re: [RFC][PATCH] ftrace interface for blktrace

From: Ingo Molnar
Date: Mon Jan 19 2009 - 08:34:25 EST

* Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> wrote:

> I hope that by dropping the requirement to a userspace bit (be it big or
> small) we can set a record for such kind of tracing infrastructure now
> that tracepoints are being proposed left and right.
> After all, somebody said that userspace is just a test case for the
> kernel, and for things like developer assists...


Also, for certain tracing modes where we just do the run to gather
statistics (but do not plan to capture any trace), it is more efficient to
have an in-kernel histogram than to export gobs of data to user-space at
great expense, just to throw away most of it there ;-)

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