binary printf checked in

[Gui,Jian]

> I've committed a new printf. I'm working on docs and tests and will get
> those in tomorrow. Meanwhile, please give it a try and let me know about
> any problems, needed enhancements, etc.
>
> This printf implements %b, %n, and corrects problems with %p.
>
Can you add the suport of "%lb" (and "%llb") ?
  %lb:  print a long integer in binary format
  %llb: print a long long integer in binary format
Because a long integer is 4-byte on 32bit machines but 8-byte on 64bit ones,
it is inconvient to use "%b" to handle them both.

I tried the binary printf on my ppc64/2.6.9-34.EL and it works well.
Here is some performance result:

SystemTap BENCH2        Mon Apr 10 09:35:17 EDT 2006
kernel: 2.6.9-34.EL.root ppc64
Red Hat Enterprise Linux AS release 4 (Nahant Update 3)
localhost.localdomain:  09:35:17 up 1 min,  1 user,  load average: 0.54, 0.22, 
0.08
processors: 8 POWER5 (gr) 1502.496000MHz revision: 2.2
MemTotal:      2045148 kB       MemFree:       1933824 kB
----------------------------------------------------------------
For comparison, function call overhead is 273 nsecs.
Times below are nanoseconds per probe and include kprobe overhead.
----------------------------------------------------------------
+--- S = Script, R = Runtime
|+-- * = Relayfs                Threads
|| NAME                             1       2       4       8
R : empty probe                   987    1072    1126     667
S : empty probe                  1179    1254    1304     787
S : printf 100 chars             2996    3592    3500    1971
WARNING: 436619 transport failures with 8 threads
S*: printf 100 chars             3308    3127    3090    2058
S : print 100 chars              3738    3488    3870    2263
WARNING: 133203 transport failures with 8 threads
S : printf 5 integers            6023    6040    5906    4224
S : binary printf 5 integers     2358    2447    2703    1836
S : printf 10 integers          10194   10301    9893    7379
WARNING: 75799 transport failures with 8 threads
S : binary printf 10 integers    2940    3446    3446    2029
WARNING: 153729 transport failures with 8 threads