Profiling of ext2fs

[Michael Casadevall]

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After much blood, sweat, and tears, I managed to build the translator with 
profiling (not an easy task, and it flushed out a few bugs with GCC at the 
same time that had to be patched around for the time being, and some more 
which need to be resolved). I ran ext2fs.profiling (a static version of 
the translator with profiling), and got the following results with 
gmon.out (I put it as an attachment due to the sheer size of the output).

The first thing you'll notice is a distinct lack of times. Googling says 
this is caused when the program spends virtually no time in user mode 
(gprof can only track userspace times, not kernel or real). While this 
might be the case, especially if the translator is using co-location 
(which I think is disabled in Hurd though), it might also be a bug in 
gprof itself (I get a function terminated message on console, so this 
requires futher investagation), but we can decude some things. For the 
test, I deleted a directory on the mounted HDD, and then copied that same 
folder from the root drive to it. As you can see, there are loads of calls 
to IO, and it also removes quite a few suspected laggers such as Mach IPC.

I'm not an expert in mach's guts, so I'll leave this for you all to pick 
over while I see if I can figure out why timing is broken.
Michael
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