Hello Fabian; --- Sab 23/6/12, Fabian Keil ha scritto:
> Pedro Giffuni <p...@freebsd.org> wrote: > > > I am not a Dtrace user (yet) but I started to port the > Log/linear > > quantizations from Illumos: > > > > http://dtrace.org/blogs/bmc/2011/02/08/llquantize/ > > > > Apparently this patch should do it: > > > > http://people.freebsd.org/~pfg/patches/patch-llquantize-complete > > > > Unfortunately when I tried to build current with Dtrace > > support, my i386 Virtualbox VM got stuck in ctfmerge so > > this is completely untested. > > > > Testers that know how to use it are welcome :). > > I applied it on 10-CURRENT amd64 from /usr/src with patch > -p0 without any conflicts, but it doesn't appear to be > working. > > The example from the blog post above triggers an assertion > that is still reproducible when reducing the test case: > > fk@r500 /tmp $sudo dtrace -n 'tick-1ms{@ = llquantize(i++, > 10, 0, 6, 20);}' > Assertion failed: (!(arg & (UINT16_MAX << > args[i].shift))), file > /usr/src/cddl/lib/libdtrace/../../../cddl/contrib/opensolaris/lib/libdtrace/common/dt_cc.c, > line 1429. > Thanks for testing! It seems like the syntax has changed from the time the example from the blog was made. The code says: /* * For log/linear quantizations, we have between one and five * arguments in addition to the expression: * * arg1 => Factor * arg2 => Low magnitude * arg3 => High magnitude * arg4 => Number of steps per magnitude * arg5 => Quantization increment value (defaults to 1) */ My suggestion would be to instead try using the test scripts in cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/llquantize/ err.D_LLQUANT_FACTORSMALL.d (for example) has @ = llquantize(0, 1, 0, 10, 10); hope that helps! Pedro. _______________________________________________ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
