perf-record fix and UI improvement

[Pierre Habouzit]

While toying with perf, I've noticed that perf record can easily enter
a busy loop when doing something as silly as:

    $ perf record -A ls

I've searched why and here are the patches:

 [PATCH 1/2] perf util: do_read should fail on EOF instead of busy-looping.

   Yeah, do_read here really wants to read a known size, not being able
   to should die(), not busy-lopp ;)
   That was the cause for the bug.


 [PATCH 2/2] perf-record: improve -A UI for empty or non-existent perf.data

   Though with 1/2 `git record -A ls` would then fail miserably with
   some kind of "cannot read" error, which sucks. So this patch
   understands -A as a "append or create if file is empty or inexistant"

   This fact may deserve to be documented properly, if so just tell me
   I'll send an updated patch for Documentation/


I'm kind of new to the kernel world, so I hope I sent the patches to the
proper persons.
-- 
Intersec <http://www.intersec.com>
Pierre Habouzit <pierre.habouzit@xxxxxxxxxxxx>
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