Re: ktr port from FreeBSD
:I have ported ktr (kernel trace routines) from FreeBSD (who took it from
:BSD/OS).
:I will commit it in some days if there are no major issues with it.
:
:FreeBSD also have a ktrdump util which I will commit later.
:
:http://eirikn.kerneled.org/dragonfly/ktr-dfly.patch
:
:--
:Eirik Nygaard
:eirikn@kerneled.com
I don't know about this. It (the FreeBSD code) looks poorly designed
to me.
Also, the FreeBSD code probably used mutexes where you are using a token.
For ktr_tracepoint() to be callable from 'anywhere' you can't use a token
there but must instead convert the code to use a critical section and
per-cpu arrays.
Also, 1024 entries is probably not nearly enough for a tracepoint
utility to be useful. We'd need a lot of entries... a million or more,
for it to be really useful, which implies dynamically allocating the
array at boot time rather then declaring it static.
-Matt
Matthew Dillon
<dillon@backplane.com>
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