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Re: CVS commit: src/sys

On 18/03/2010, at 5:51 AM, David Young wrote:

On Mon, Mar 15, 2010 at 04:43:04AM +0000, Mindaugas Rasiukevicius wrote:

David Young <> wrote:
On Sat, Nov 21, 2009 at 03:41:07PM +1100, matthew green wrote:

SPLDEBUG is single-purpose. It also has some bugs, which I am happy to describe. But let's keep it until we come up with something better.

now you've told me all of: it's single purpose, MD, and doesn't work.

please revert SPLDEBUG.  it does not belong in sys/kern.

Have a little patience. I am incorporating all of the suggestions that
I have heard so far into a patch.

Is there any progress on this?  IIIRC, general agreement was that
subr_spldebug.c does not belong to sys/kern.

Can you respond?

I plan to commit my final patches in this area for posterity, and then
to remove the feature just as soon as DTrace is capable of providing
it.  I don't think that there are FBT probes on all of the relevant
assembly-language routines, yet.

The FBT provider can't instrument assembly language routines because
they don't follow the standard C entry setup and exit teardown code.

The may be able to be hand-instrumented with SDT probe calls, but that
will add the overhead of a test and branch for each probe.


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