perf record: mmap fails when specifying process/thread

[David Ahern <dsahern@xxxxxxxxx>]

Latest perf-core (pulled 5 minutes ago):

# ps -C sshd
  PID TTY          TIME CMD
  961 ?        00:00:00 sshd
 1042 ?        00:00:00 sshd

# /tmp/build-perf/perf record -v -fo/tmp/perf.data -p 1042
  Warning:  ... trying to fall back to cpu-clock-ticks

  Fatal: failed to mmap with 22 (Invalid argument)


It works fine with -a argument and when a command is given, but fails
with the -p or -t argument.

David
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