perf record: Filter out POLLHUP'ed file descriptors
authorArnaldo Carvalho de Melo <acme@redhat.com>
Wed, 13 Aug 2014 14:33:59 +0000 (11:33 -0300)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Thu, 25 Sep 2014 19:46:56 +0000 (16:46 -0300)
commit6dcf45ef9877863fb68c065e5ade3cdb6217c504
tree4077d5eff9288bf8f4e9d2c481ffb166e93b5e62
parente4b356b56cfe77b800a9bc2e6efefa6a069b8a78
perf record: Filter out POLLHUP'ed file descriptors

So that we don't continue polling on vanished file descriptors, i.e.
file descriptors for events monitoring threads that exited.

I.e. the following 'perf record' command now exits as expected, instead
of staying in an eternal loop:

  $ sleep 5s &
  $ perf record -p `pidof sleep`

Reported-by: Jiri Olsa <jolsa@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-8dg8o21t2ntzly2bfh53p3sg@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
tools/perf/builtin-record.c