[Bug 1057] memory leak & increasing slowdown in pdubuf.c buf_pin / interp.c update_bounds

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Comment # 4 on bug 1057 from Frank Ch. Eigler

Problem reproduction recipe: extract tarball; apply pmval.c patch
(just to see increasing pinned-pdubuf count after each reporting
cycle).

% gdb -args  ./pmval -S '@Mon Jun  9 20:51:52.912 2014' -T 'Tue Jun 10
10:00:00' -t 333 -a archive-20140610.005058.meta
(gdb) break pmval.c:1139  # the sleep(10) line
(gdb) run
[...gaze lovingly at the report...]
Breakpoint 1, main (argc=<optimized out>, argv=<optimized out>) at pmval.c:1139
1139        sleep (10); // gdb breakpoint here & pdubufdump()
(gdb) p pdubufdump()
   free pdubuf[size]: 0x650000[28672] 0x61e000[28672] 0x648000[28672]
0x638000[28672] 0x62b000[17408] 0x619000[17408] 0x626000[17408]
   pinned pdubuf[pincnt]: 0x640000[4] 0x630000[4]
$1 = void
(gdb) c
Continuing.
[...gaze lovingly at the report...]
Breakpoint 1, main (argc=<optimized out>, argv=<optimized out>) at pmval.c:1139
1139        sleep (10); // gdb breakpoint here & pdubufdump()
(gdb) p pdubufdump()
   free pdubuf[size]: 0x638000[28672] 0x61e000[28672] 0x660000[28672]
0x658000[28672] 0x62b000[17408] 0x619000[17408] 0x626000[17408]
   pinned pdubuf[pincnt]: 0x640000[4] 0x630000[4] 0x650000[4] 0x648000[4]
$2 = void
(gdb) c
[...gaze lovingly at the report...]
Breakpoint 1, main (argc=<optimized out>, argv=<optimized out>) at pmval.c:1139
1139        sleep (10); // gdb breakpoint here & pdubufdump()
(gdb) p pdubufdump()
   free pdubuf[size]: 0x658000[28672] 0x61e000[28672] 0x670000[28672]
0x668000[28672] 0x62b000[17408] 0x619000[17408] 0x626000[17408]
   pinned pdubuf[pincnt]: 0x640000[4] 0x630000[4] 0x650000[4] 0x648000[4]
0x638000[4] 0x660000[4]


Notice how new pinned pdubufs showed up each time.  (Imagine the impact upon
an program that rescans dozens of archives frequently.)

This is with pcp 3.9.4 shared libraries on fedora19 x86-64, so long after
your 3.9.0 interp.c changes.

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